鸿蒙HarmonyOS开发实战：【分布式音乐播放】

介绍

本示例使用fileIo获取指定音频文件，并通过AudioPlayer完成了音乐的播放完成了基本的音乐播放、暂停、上一曲、下一曲功能；并使用DeviceManager完成了分布式设备列表的显示和分布式能力完成了音乐播放状态的跨设备分享。

本示例用到了与用户进行交互的Ability的能力接口[@ohos.ability.featureAbility]

文件存储管理能力接口[@ohos.fileio]

屏幕属性接口[@ohos.display]

媒体查询接口[@ohos.mediaquery]

分布式数据管理接口[@ohos.data.distributedData]

音视频相关媒体业务能力接口[@ohos.multimedia.media]

分布式设备管理能力接口(设备管理)，实现设备之间的kvStore对象的数据传输交互[@ohos.distributedDeviceManager]

效果预览

使用说明

1.音乐播放，点击播放、暂停、上一曲、下一曲按钮可以对音乐进行操作。

2.跨设备分享，组网并且双端均已授权条件下，点击分享按钮，选择设备，拉起对端设备上的音乐，并将本端的播放状态同步到对端上。

3.跨设备停止分享，分享成功前提条件下，点击停止分享按钮，将对端设备拉起的音乐应用停止退出。

相关概念

音频播放：媒体子系统包含了音视频相关媒体业务，通过AudioPlayer实现音频播放的能力。

数据分享：分布式数据管理为应用程序提供不同设备间数据库的分布式协同能力。通过调用分布式数据各个接口，应用程序可将数据保存到分布式数据库中，并可对分布式数据库中的数据进行增/删/改/查等各项操作。

资料文档参考

具体实现

鸿蒙NEXT文档可以
+mau12379是v喔直接领取！
1
2

在分布式音乐播放器中，分布式设备管理包含了分布式设备搜索、分布式设备列表弹窗、远端设备拉起三部分。
首先在分布式组网内搜索设备，然后把设备展示到分布式设备列表弹窗中，最后根据用户的选择拉起远端设备。

分布式设备搜索

通过SUBSCRIBE_ID搜索分布式组网内的远端设备，详见registerDeviceListCallback(callback) {}模块[源码参考]。

/*

* Copyright (c) 2022 Huawei Device Co., Ltd.

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

*     http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/



import deviceManager from '@ohos.distributedDeviceManager';

import Logger from '../model/Logger';



let SUBSCRIBE_ID: number = 100;

const RANDOM: number = 65536;

const TAG: string = 'RemoteDeviceModel';



export class RemoteDeviceModel {

  public deviceLists: Array<deviceManager.DeviceBasicInfo> = [];

  public discoverLists: Array<deviceManager.DeviceBasicInfo> = [];

  private callback: () => void = null;

  private authCallback: () => void = null;

  private deviceManager: deviceManager.DeviceManager = undefined;



  registerDeviceListCallback(callback) {

    if (typeof (this.deviceManager) === 'undefined') {

      Logger.info(TAG, 'deviceManager.createDeviceManager begin');

      try {

        this.deviceManager = deviceManager.createDeviceManager('ohos.samples.distributedmusicplayer');

        this.registerDeviceList(callback);

        Logger.info(TAG, `createDeviceManager callback returned, value= ${JSON.stringify(this.deviceManager)}`);

      } catch (error) {

        Logger.info(TAG, `createDeviceManager throw error, error=${error} message=${error.message}`);

      }

      Logger.info(TAG, 'deviceManager.createDeviceManager end');

    } else {

      this.registerDeviceList(callback);

    };

  };



  registerDeviceList(callback) {

    Logger.info(TAG, 'registerDeviceListCallback');

    this.callback = callback;

    if (this.deviceManager === undefined) {

      Logger.error(TAG, 'deviceManager has not initialized');

      this.callback();

      return;

    };



    Logger.info(TAG, 'getTrustedDeviceListSync begin');

    let list: deviceManager.DeviceBasicInfo[] = [];

    try {

      list = this.deviceManager.getAvailableDeviceListSync();

    } catch (error) {

      Logger.info(TAG, `getTrustedDeviceListSync throw error, error=${error} message=${error.message}`);

    };

    Logger.info(TAG, `getTrustedDeviceListSync end, deviceLists= ${JSON.stringify(list)}`);

    if (typeof (list) !== 'undefined' && typeof (list.length) !== 'undefined') {

      this.deviceLists = list;

    };

    this.callback();

    Logger.info(TAG, 'callback finished');



    try {

      this.deviceManager.on('deviceStateChange', (data) => {

        Logger.info(TAG, `deviceStateChange data= ${JSON.stringify(data)}`);

        switch (data.action) {

          case deviceManager.DeviceStateChange.AVAILABLE:

            this.discoverLists = [];

            this.deviceLists.push(data.device);

            Logger.info(TAG, `reday, updated device list= ${JSON.stringify(this.deviceLists)} `);

            let list: deviceManager.DeviceBasicInfo[] = [];

            try {

              list = this.deviceManager.getAvailableDeviceListSync();

            } catch (err) {

              Logger.info(TAG, `this err is ${JSON.stringify(err)}`);

            }

            Logger.info(TAG, `getTrustedDeviceListSync end, deviceList= ${JSON.stringify(list)}`);

            if (typeof (list) !== 'undefined' && typeof (list.length) !== 'undefined') {

              this.deviceLists = list;

            }

            this.callback();

            break;

          case deviceManager.DeviceStateChange.UNAVAILABLE:

            if (this.deviceLists.length > 0) {

              let list = [];

              for (let i = 0; i < this.deviceLists.length; i++) {

                if (this.deviceLists[i].deviceId !== data.device.deviceId) {

                  list[i] = data.device;

                };

              };

              this.deviceLists = list;

            };

            Logger.info(TAG, `offline, updated device list= ${JSON.stringify(this.deviceLists)}`);

            this.callback();

            break;

          default:

            break;

        };

      });

      this.deviceManager.on('discoverSuccess', (data) => {

        Logger.info(TAG, `discoverSuccess data= ${JSON.stringify(data)}`);

        Logger.info(TAG, `discoverSuccess this.deviceLists= ${this.deviceLists}, this.deviceLists.length= ${this.deviceLists.length}`);

        for (let i = 0;i < this.discoverLists.length; i++) {

          if (this.discoverLists[i].deviceId === data.device.deviceId) {

            Logger.info(TAG, 'device founded, ignored');

            return;

          };

        };

        this.discoverLists[this.discoverLists.length] = data.device;

        this.callback();

      });

      this.deviceManager.on('discoverFailure', (data) => {

        Logger.info(TAG, `discoverFailure data= ${JSON.stringify(data)}`);

      });

      this.deviceManager.on('serviceDie', () => {

        Logger.error(TAG, 'serviceDie');

      });

    } catch (error) {

      Logger.info(TAG, `on throw error, error=${error} message=${error.message}`);

    }



    let discoverParam = {

      'discoverTargetType': 1

    };

    let filterOptions = {

      'availableStatus': 0

    };

    Logger.info(TAG, `startDiscovering ${SUBSCRIBE_ID}`);

    try {

      if (this.deviceManager !== null) {

        this.deviceManager.startDiscovering(discoverParam, filterOptions);

      };

    } catch (error) {

      Logger.error(TAG, `startDiscovering throw error, error=${error} message=${error.message}`);

    };

  };



  authDevice(device, callback) {

    Logger.info(TAG, `authDevice ${device}`);

    if (device !== undefined) {

      for (let i = 0; i < this.discoverLists.length; i++) {

        if (this.discoverLists[i].deviceId === device.deviceId) {

          Logger.info(TAG, 'device founded, ignored');

          let bindParam = {

            bindType: 1,

            targetPkgName: 'ohos.samples.distributedmusicplayer',

            appName: 'Music',

          };

          Logger.info(TAG, `authenticateDevice ${JSON.stringify(this.discoverLists[i])}`);

          try {

            this.deviceManager.bindTarget(device.deviceId, bindParam, (err, data) => {

              if (err) {

                Logger.error(TAG, `authenticateDevice error: ${JSON.stringify(err)}`);

                this.authCallback = () => {

                };

                return;

              };

              Logger.info(TAG, `authenticateDevice succeed, data= ${JSON.stringify(data)}`);

              this.authCallback = callback;

            });

          } catch (error) {

            Logger.error(TAG, `authenticateDevice throw error, error=${JSON.stringify(error)} message=${error.message}`);

          }

        }

      }

    }

  };



  unregisterDeviceListCallback() {

    Logger.info(TAG, `stopDiscovering ${SUBSCRIBE_ID}`);

    if (this.deviceManager === undefined) {

      return;

    };

    try {

      this.deviceManager.stopDiscovering();

      this.deviceManager.off('deviceStateChange');

      this.deviceManager.off('discoverSuccess');

      this.deviceManager.off('discoverFailure');

      this.deviceManager.off('serviceDie');

    } catch (error) {

      Logger.info(TAG, `stopDeviceDiscovery throw error, error=${error} message=${error.message}`);

    }

    this.deviceLists = [];

  };

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381

分布式设备列表弹窗

使用@CustomDialog弹出分布式设备列表弹窗，参考首页。[源码参考]。

/*

 * Copyright (c) 2022 Huawei Device Co., Ltd.

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

import deviceManager from '@ohos.distributedDeviceManager';

import Logger from '../model/Logger';



const TAG: string = 'DeviceDialog';



@CustomDialog

export struct DeviceDialog {

  controller?: CustomDialogController;

  private deviceLists: Array<deviceManager.DeviceBasicInfo> = [];

  private selectedIndex: number = 0;

  private selectedIndexChange: (selectedIndex: number) => void = () => {

  };



  build() {

    Column() {

      Text($r('app.string.choiceDevice'))

        .fontSize('32px')

        .width('434px')

        .fontColor(Color.Black)

        .textAlign(TextAlign.Start)

        .fontWeight(600)

      List() {

        ForEach(this.deviceLists, (item: deviceManager.DeviceBasicInfo, index: number | undefined) => {

          ListItem() {

            Flex({

              direction: FlexDirection.Row,

              justifyContent: FlexAlign.SpaceBetween,

              alignItems: ItemAlign.Center

            }) {

              Text(item.deviceName)

                .fontSize(16)

                .width('86%')

                .fontColor(Color.Black)

                .textAlign(TextAlign.Start)

              Radio({ value: '', group: 'radioGroup' })

                .radioStyle({

                  checkedBackgroundColor: '#ff0d64fb'

                })

                .width('7%')

                .checked(index === this.selectedIndex ? true : false)

            }

            .height(55)

            .onClick(() => {

              Logger.info(TAG, `select device: ${item.deviceId}`)

              if (index === this.selectedIndex) {

                Logger.info(TAG, 'index === this.selectedIndex')

                return

              }

              this.selectedIndex = index !== undefined ? index : 0

              if (this.controller !== undefined) {

                this.controller.close()

              }

              this.selectedIndexChange(this.selectedIndex)

            })

          }

          .width('434px')

          .height('80px')

        })

      }

      .margin({ top: 12 })

      .width('434px')

      .height('18%')



      Button() {

        Text($r('app.string.cancel'))

          .width('90%')

          .fontSize(21)

          .fontColor('#ff0d64fb')

          .textAlign(TextAlign.Center)

      }

      .margin({ bottom: 16 })

      .type(ButtonType.Capsule)

      .backgroundColor(Color.White)

      .onClick(() => {

        if (this.controller !== undefined) {

          this.controller.close()

        }

      })

    }

    .margin({ bottom: 36 })

    .width('500px')

    .padding(10)

    .backgroundColor(Color.White)

    .border({ color: Color.White, radius: 20 })

  }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199

远端设备拉起

通过startAbility(deviceId)方法拉起远端设备的包，[源码参考]。

/*

 * Copyright (c) 2022-2023 Huawei Device Co., Ltd.

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';

import display from '@ohos.display';

import common from '@ohos.app.ability.common';

import mediaQuery from '@ohos.mediaquery';

import rpc from '@ohos.rpc';

import Want from '@ohos.app.ability.Want';

import PermissionRequestResult from 'security/PermissionRequestResult';

import KvStoreModel from '../model/KvStoreModel';

import Logger from '../model/Logger';

import PlayerModel from '../model/PlayerModel';

import deviceManager from '@ohos.distributedDeviceManager';

import ability from '@ohos.ability.ability';

import { RemoteDeviceModel } from '../model/RemoteDeviceModel';

import { DeviceDialog } from '../common/DeviceDialog';

import {

  APPLICATION_BUNDLE_NAME,

  APPLICATION_SERVICE_NAME,

  MusicSharedEventCode,

  MusicSharedStatus,

  MusicConnectEvent

} from '../common/MusicSharedDefinition';



const TAG: string = 'Index';

const DESIGN_WIDTH: number = 720.0;

const SYSTEM_UI_HEIGHT: number = 134;

const DESIGN_RATIO: number = 16 / 9;

const ONE_HUNDRED: number = 100;

const ONE_THOUSAND: number = 1000;

const SIXTY: number = 60;

const REMOTE_ABILITY_STARTED: string = 'remoteAbilityStarted';

const ABILITY_SHARED_BUTTON = 0;

const DEFAULT_NUM = -1;

const PREVIOUS_CLICK = 2;



interface Params {

  uri: string,

  seekTo: number,

  isPlaying: boolean

};



@Entry

@Component

 struct Index {

  private listener = mediaQuery.matchMediaSync('screen and (min-aspect-ratio: 1.5) or (orientation: landscape)');

  @State isLand: boolean = false;

  @State currentTimeText: string = '';

  @State currentProgress: number = 0;

  @State totalMs: number = 0;

  @State riscale: number = 1;

  @State risw: number = 720;

  @State rish: number = 1280;

  @State isSwitching: boolean = false;

  @State deviceLists: Array<deviceManager.DeviceBasicInfo> = [];

  @State isDialogShowing: boolean = false;

  @State isDistributed: boolean = false;

  @State title: string = '';

  @State totalTimeText: string = '00:00';

  @State albumSrc: Resource = $r('app.media.album');

  @State selectedIndex: number = 0;

  @State imageArrays: Array<Resource> = [$r('app.media.ic_hop'), $r('app.media.ic_play_previous'), $r('app.media.ic_play'), $r('app.media.ic_play_next')];

  private dialogController: CustomDialogController | null = null;

  @StorageLink('exitMusicApp') @Watch('exitMusicApp') isExitMusicApp: boolean = false;

  @StorageLink('remoteServiceExtensionConnectEvent') @Watch('remoteServiceExtensionConnectEvent') isRemoteServiceExtensionConnectEvent: boolean = false;

  @StorageLink('musicPlay') @Watch('musicPlay') isMusicPlay: boolean = false;

  @StorageLink('musicPause') @Watch('musicPause') isMusicPause: boolean = false;

  private remoteDeviceModel: RemoteDeviceModel = new RemoteDeviceModel();

  private context: common.UIAbilityContext | null = null;

  private deviceId: string | null = null;

  private clickFlag = MusicSharedStatus.MUSIC_SHARED;

  private localExtensionRemote: rpc.IRemoteObject | null = null;

  onLand = (mediaQueryResult: mediaQuery.MediaQueryResult) => {

    Logger.info(TAG, `onLand: mediaQueryResult.matches= ${mediaQueryResult.matches}`);

    if (mediaQueryResult.matches) {

      this.isLand = true;

    } else {

      this.isLand = false;

    };

  };



  showDialog() {

    this.remoteDeviceModel.registerDeviceListCallback(() => {

      Logger.info(TAG, 'registerDeviceListCallback, callback entered');

      this.deviceLists = [];

      this.deviceLists.push({

        deviceId: '0',

        deviceName: 'local device',

        deviceType: '0',

        networkId: ''

      });

      let deviceTempList = this.remoteDeviceModel.discoverLists.length > 0 ? this.remoteDeviceModel.discoverLists : this.remoteDeviceModel.deviceLists;

      for (let i = 0; i < deviceTempList.length; i++) {

        Logger.info(TAG, `device ${i}/${deviceTempList.length} deviceId= ${deviceTempList[i].deviceId},

         deviceName= ${deviceTempList[i].deviceName}, deviceType= ${deviceTempList[i].deviceType}`);

        this.deviceLists.push(deviceTempList[i]);

        Logger.info(TAG, 'deviceLists push end');

      };

      Logger.info(TAG, 'CustomDialogController start');

      if (this.dialogController !== null) {

        this.dialogController.close();

        this.dialogController = null;

      }

      this.dialogController = new CustomDialogController({

        builder: DeviceDialog({

          deviceLists: this.deviceLists,

          selectedIndex: this.selectedIndex,

          selectedIndexChange: this.selectedIndexChange

        }),

        autoCancel: true,

        customStyle: true

      });

      this.dialogController.open();

      Logger.info(TAG, 'CustomDialogController end');

    })

  };



  showPromptDialog(title: ResourceStr, str: ResourceStr) {

    AlertDialog.show({

      title: title,

      message: str,

      confirm: {

        value: $r('app.string.cancel'),

        action: () => {

          Logger.info(TAG, `Button-clicking callback`);

        }

      },

      cancel: () => {

        Logger.info(TAG, `Closed callbacks`);

      }

    });

  };



  remoteServiceExtensionConnectEvent(event: string) {

    if (typeof (event) === 'string') {

      let viewThis = AppStorage.get<Index>('viewThis');

      if (viewThis !== undefined) {

        if (event === MusicConnectEvent.EVENT_CONNECT) {

          viewThis.clickFlag = MusicSharedStatus.MUSIC_STOP_SHARED;

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          Logger.info(TAG, 'remote service on connect callbacked');

        } else if (event === MusicConnectEvent.EVENT_DISCONNECT) {

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.onDisconnectService'));

        } else if (event === MusicConnectEvent.EVENT_FAILED) {

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.onFailedService'));

        } else if (event === MusicConnectEvent.EVENT_TIMEOUT) {

          this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.ConnectionTimeout'));

        }

      }

    } else {

      Logger.info(TAG, 'event is not a string');

    };

  };



  musicPause() {

    Logger.info(TAG, 'music pause recv');

    PlayerModel.pause();

    let viewThis = AppStorage.get<Index>('viewThis');

    viewThis!.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

  };



  musicPlay() {

    Logger.info(TAG, 'music play recv');

    PlayerModel.play(DEFAULT_NUM, true);

    let viewThis = AppStorage.get<Index>('viewThis');

    viewThis!.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

  };



  exitMusicApp() {

    Logger.info(TAG, `exit music app called`);

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      this.localExtensionRemote.sendRequest(

        MusicSharedEventCode.STOP_LOCAL_SERIVCE,

        data,

        reply,

        option);

    } else {

      Logger.info(TAG, `Remote start type is error or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  connectLocalExtension() {

    let localServiceWant: Want = {

      bundleName: APPLICATION_BUNDLE_NAME,

      abilityName: APPLICATION_SERVICE_NAME,

    };

    let connectOptions: ability.ConnectOptions = {

      onConnect: (elementName, remote) => {

        this.localExtensionRemote = remote;

        Logger.info(TAG, `onConnect called elementName is ${JSON.stringify(elementName)}`);

      },

      onDisconnect: (elementName) => {

        if (this.context !== null) {

          this.context.terminateSelf();

          Logger.info(TAG, `OnDisconnect called elementName is ${JSON.stringify(elementName)}`);

        };

      },

      onFailed: (code) => {

        if (this.context !== null) {

          this.context.terminateSelf();

          Logger.info(TAG, `OnFailed called code is ${JSON.stringify(code)}`);

        }

      }

    };

    if (this.context !== null) {

      this.context.connectServiceExtensionAbility(localServiceWant, connectOptions);

    };

  };



  startRemoteExtension(deviceId: string, params: object) {

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object' && typeof (deviceId) === 'string' && deviceId !== '') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      data.writeString(deviceId);

      data.writeString(JSON.stringify(params));

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.START_DISTRIBUTED_MUSIC_SERVICE, data, reply, option);

      this.deviceId = deviceId;

      this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

    } else {

      Logger.info(TAG, `Remote start type is error or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  stopRemoteExtension() {

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object' && typeof (this.deviceId) === 'string' && this.deviceId !== '') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      data.writeString(this.deviceId);

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.STOP_DISTRIBUTED_MUSIC_SERVICE, data, reply, option);

      this.deviceId = '';

    } else {

      Logger.info(TAG, `Remote stopped type is wrong or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  sendMessagePlay() {

    if (this.localExtensionRemote !== null) {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.PLAY_MUSIC_SERVICE, data, reply, option);

      Logger.info(TAG, `onPlayClick send mssage success`);

    } else {

      Logger.info(TAG, `can not get proxy`);

      return;

    };

  };



  sendMessagePause() {

    if (this.localExtensionRemote === null) {

      Logger.info(TAG, `can not get proxy`);

      return;

    };

    let option = new rpc.MessageOption();

    let data = new rpc.MessageParcel();

    let reply = new rpc.MessageParcel();



    this.localExtensionRemote.sendRequest(MusicSharedEventCode.PAUSE_MUSIC_SERVICE, data, reply, option);

    Logger.info(TAG, `onPauseClick send mssage success`);

  };



  onBackPress() {

    if (this.isDialogShowing === true) {

      this.dismissDialog();

      return true;

    };

    return false;

  };



  onPageHide() {

    if (this.isDialogShowing === true) {

      this.dismissDialog();

      return true;

    };

    return false;

  };



  dismissDialog() {

    if (this.dialogController !== null) {

      this.dialogController.close();

    }

    this.remoteDeviceModel.unregisterDeviceListCallback();

    this.isDialogShowing = false;

  };



  startAbilityContinuation(deviceId: string) {

    let params: Params = {

      uri: '',

      seekTo: 0,

      isPlaying: false

    };

    Logger.info(TAG, `startAbilityContinuation PlayerModel.index= ${PlayerModel.index}/${PlayerModel.playlist.audioFiles.length}`);

    if (PlayerModel.index >= 0 && PlayerModel.index <= PlayerModel.playlist.audioFiles.length) {

      params = {

        uri: PlayerModel.playlist.audioFiles[PlayerModel.index].fileUri,

        seekTo: PlayerModel.getCurrentMs(),

        isPlaying: PlayerModel.isPlaying

      };

    };

    Logger.info(TAG, `context.startAbility deviceId= ${deviceId}`);

    if (this.context !== null) {

      KvStoreModel.setOnMessageReceivedListener(this.context, REMOTE_ABILITY_STARTED, () => {

        Logger.info(TAG, 'OnMessageReceived, terminateSelf');

      });

    };

    Logger.info(TAG, `context.startAbility start`);

    this.clickFlag = MusicSharedStatus.MUSIC_REMOTING;

    this.startRemoteExtension(deviceId, params);

    this.clearSelectState();

    Logger.info(TAG, 'context.startAbility end');

  };



  selectedIndexChange = (selectedIndex: number) => {

    if (this.context !== null && selectedIndex === 0) {

      this.context.startAbility({ bundleName: 'ohos.samples.distributedmusicplayer',

        abilityName: 'ohos.samples.distributedmusicplayer.MainAbility',

        deviceId: this.deviceLists[selectedIndex].deviceId,

        parameters: {

          isFA: 'EXIT'

        }

      }).then(() => {

        Logger.info(TAG, `startAbility finished`);

      }).catch((err: Error) => {

        Logger.info(TAG, `startAbility filed error = ${JSON.stringify(err)}`);

      });

      this.isDistributed = false;

      this.selectedIndex = 0;

      if (this.dialogController !== null) {

        this.dialogController.close();

      }

      this.deviceLists = [];

      return;

    };

    this.selectedIndex = selectedIndex;

    this.selectDevice();

  };



  selectDevice() {

    Logger.info(TAG, 'start ability ......');

    if (this.selectedIndex !== undefined && (this.remoteDeviceModel === null || this.remoteDeviceModel.discoverLists.length <= 0)) {

      Logger.info(TAG, `start ability device:${JSON.stringify(this.deviceLists)}`);

      this.startAbilityContinuation(this.deviceLists[this.selectedIndex].networkId as string);

      this.clearSelectState();

      return;

    };

    Logger.info(TAG, 'start ability, needAuth');

    if (this.selectedIndex !== undefined){

      this.remoteDeviceModel.authDevice(this.deviceLists[this.selectedIndex], (device: deviceManager.DeviceBasicInfo) => {

        Logger.info(TAG, 'auth and online finished');

        this.startAbilityContinuation(device.networkId);

      });

    }

    Logger.info(TAG, 'start ability2 ......');

    this.clearSelectState();

  };



  clearSelectState() {

    this.deviceLists = [];

    if (this.dialogController) {

      this.dialogController.close();

      this.dialogController = null;

    };

  };



  getShownTimer(ms: number) {

    let minStr: string;

    let secStr: string;

    let seconds = Math.floor(ms / ONE_THOUSAND);

    let sec = seconds % SIXTY;

    Logger.info(TAG, `getShownTimer sec = ${sec}`);

    let min = (seconds - sec) / SIXTY;

    Logger.info(TAG, `getShownTimer min = ${min}`);

    if (sec < 10) {

      secStr = '0' + sec;

    } else {

      secStr = sec.toString(10);

    };

    if (min < 10) {

      minStr = '0' + min;

    } else {

      minStr = min.toString(10);

    };

    Logger.warn(TAG, `getShownTimer = ${minStr}:${secStr}`);

    return minStr + ':' + secStr;

  };



  refreshSongInfo(index: number) {

    Logger.info(TAG, `refreshSongInfo ${index}/${PlayerModel.playlist.audioFiles.length}`);

    if (index >= PlayerModel.playlist.audioFiles.length) {

      Logger.warn(TAG, 'refreshSongInfo ignored');

      return;

    };

    // update song title

    this.title = PlayerModel.playlist.audioFiles[index].name;

    this.albumSrc = (index % 2 === 0) ? $r('app.media.album') : $r('app.media.album2');



    // update duration

    this.totalMs = PlayerModel.getDuration();

    this.totalTimeText = this.getShownTimer(this.totalMs);

    this.currentTimeText = this.getShownTimer(PlayerModel.getCurrentMs());

    Logger.info(TAG, `refreshSongInfo this.title= ${this.title}, this.totalMs= ${this.totalMs}, this.totalTimeText= ${this.totalTimeText},this.currentTimeText= ${this.currentTimeText}`);

  };



  onAppSharedClick() {

    if (this.clickFlag === MusicSharedStatus.MUSIC_SHARED) {

      Logger.info(TAG, `1start button is ${JSON.stringify(this.imageArrays[ABILITY_SHARED_BUTTON])}`);

      this.showDialog();

    } else if (this.clickFlag === MusicSharedStatus.MUSIC_STOP_SHARED) {

      Logger.info(TAG, `2start button is ${JSON.stringify(this.imageArrays[ABILITY_SHARED_BUTTON])}`);

      this.stopRemoteExtension();

      this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

    };

  };



  onPreviousClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onPreviousClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, 'onPreviousClick');

    PlayerModel.index--;

    if (PlayerModel.index < 0 && PlayerModel.playlist.audioFiles.length >= 1) {

      PlayerModel.index = PlayerModel.playlist.audioFiles.length - 1;

    };

    this.currentProgress = 0;

    this.isSwitching = true;



    PlayerModel.preLoad(PlayerModel.index, () => {

      this.refreshSongInfo(PlayerModel.index);

      PlayerModel.play(0, true);

      if (PlayerModel.isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      };

      this.isSwitching = false;

    });

  };



  onNextClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onNextClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, 'onNextClick');

    PlayerModel.index++;

    if (PlayerModel.index >= PlayerModel.playlist.audioFiles.length) {

      PlayerModel.index = 0;

    };

    this.currentProgress = 0;

    this.isSwitching = true;

    PlayerModel.preLoad(PlayerModel.index, () => {

      this.refreshSongInfo(PlayerModel.index);

      PlayerModel.play(0, true);

      if (PlayerModel.isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      };

      this.isSwitching = false;

    });

  };



  onPlayClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onPlayClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, `onPlayClick isPlaying= ${PlayerModel.isPlaying}`);

    if (PlayerModel.isPlaying) {

      PlayerModel.pause();

      this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

      this.sendMessagePause();

    } else {

      PlayerModel.preLoad(PlayerModel.index, () => {

        PlayerModel.play(DEFAULT_NUM, true);

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

        this.sendMessagePlay();

      })

    };

  };



  restoreFromWant() {

    Logger.info(TAG, 'restoreFromWant');

    let status: Record<string, Object> | undefined = AppStorage.get('status');

    if (status !== undefined && status !== null && status.uri !== null) {

      KvStoreModel.broadcastMessage(this.context, REMOTE_ABILITY_STARTED);

      Logger.info(TAG, 'restorePlayingStatus');

      PlayerModel.restorePlayingStatus(status, (index: number) => {

        Logger.info(TAG, `restorePlayingStatus finished, index= ${index}`);

        if (index >= 0) {

          this.refreshSongInfo(index);

        } else {

          PlayerModel.preLoad(0, () => {

            this.refreshSongInfo(0);

          })

        }

        if (status !== undefined) {

          Logger.info(TAG, `Index PlayerModel.restorePlayingStatus this.totalMs = ${this.totalMs}, status.seekTo = ${status.seekTo}`);

          this.currentProgress = Math.floor(Number(status.seekTo) / this.totalMs * ONE_HUNDRED);

        }

      })

    } else {

      PlayerModel.preLoad(0, () => {

        this.refreshSongInfo(0);

      });

    }

  };



  aboutToAppear() {

    Logger.info(TAG, `begin`);

    Logger.info(TAG, 'grantPermission');

    this.context = getContext(this) as common.UIAbilityContext;

    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();

    let permission: Array<Permissions> = ['ohos.permission.DISTRIBUTED_DATASYNC'];

    try {

      atManager.requestPermissionsFromUser(this.context, permission).then((data: PermissionRequestResult) => {

        Logger.info(TAG, `data: ${JSON.stringify(data)}`);

      }).catch((err: object) => {

        Logger.info(TAG, `err: ${JSON.stringify(err)}`);

      })

    } catch (err) {

      Logger.info(TAG, `catch err->${JSON.stringify(err)}`);

    }

    display.getDefaultDisplay().then((dis: display.Display) => {

      Logger.info(TAG, `getDefaultDisplay dis= ${JSON.stringify(dis)}`);

      let proportion = DESIGN_WIDTH / dis.width;

      let screenWidth = DESIGN_WIDTH;

      let screenHeight = (dis.height - SYSTEM_UI_HEIGHT) * proportion;

      this.riscale = (screenHeight / screenWidth) / DESIGN_RATIO;

      if (this.riscale < 1) {

        // The screen ratio is shorter than design ratio

        this.risw = screenWidth * this.riscale;

        this.rish = screenHeight;

      } else {

        // The screen ratio is longer than design ratio

        this.risw = screenWidth;

        this.rish = screenHeight / this.riscale;

      }

      Logger.info(TAG, `proportion=${proportion} , screenWidth= ${screenWidth},

      screenHeight= ${screenHeight} , riscale= ${this.riscale} , risw= ${this.risw} , rish= ${this.rish}`);

    })

    Logger.info(TAG, 'getDefaultDisplay end');

    this.currentTimeText = this.getShownTimer(0);

    PlayerModel.setOnStatusChangedListener((isPlaying: string) => {

      Logger.info(TAG, `on player status changed, isPlaying= ${isPlaying} refresh ui`);

      PlayerModel.setOnPlayingProgressListener((currentTimeMs: number) => {

        this.currentTimeText = this.getShownTimer(currentTimeMs);

        this.currentProgress = Math.floor(currentTimeMs / this.totalMs * ONE_HUNDRED);

      });

      if (isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      } else {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

      }

    });



    PlayerModel.getPlaylist(() => {

      Logger.info(TAG, 'on playlist generated, refresh ui');

      this.restoreFromWant();

    });



    AppStorage.setOrCreate('viewThis', this);



    this.connectLocalExtension();

  };



  aboutToDisappear() {

    Logger.info(TAG, `aboutToDisappear begin`)

    if (PlayerModel === undefined) {

      return

    }

    PlayerModel.release()

    this.remoteDeviceModel.unregisterDeviceListCallback()

    this.dialogController = null

    KvStoreModel.deleteKvStore()

    Logger.info(TAG, `aboutToDisappear end`)

  };



  build() {

    Column() {

      Blank()

        .width('100%')

        .height(72)

      Text(this.title)

        .width('100%')

        .fontSize(28)

        .margin({ top: '10%' })

        .fontColor(Color.White)

        .textAlign(TextAlign.Center)

      Image(this.albumSrc)

        .width(this.isLand ? '60%' : '89%')

        .objectFit(ImageFit.Contain)

        .margin({ top: 50, left: 40, right: 40 })

      Row() {

        Text(this.currentTimeText)

          .fontSize(20)

          .fontColor(Color.White)

        Blank()

        Text(this.totalTimeText)

          .fontSize(20)

          .fontColor(Color.White)

      }

      .width('90%')

      .margin({ top: '12%' })



      Slider({ value: typeof (this.currentProgress) === 'number' ? this.currentProgress : 0 })

        .trackColor('#64CCE7FF')

        .width('90%')

        .selectedColor('#ff0c4ae7')

        .onChange((value: number, mode: SliderChangeMode) => {

          this.currentProgress = value;

          if (typeof (this.totalMs) !== 'number') {

            this.currentProgress = 0;

            Logger.info(TAG, `setProgress ignored, totalMs= ${this.totalMs}`);

            return;

          };

          let currentMs = this.currentProgress / ONE_HUNDRED * this.totalMs;

          this.currentTimeText = this.getShownTimer(currentMs);

          if (mode === SliderChangeMode.End || mode === 3) {

            Logger.info(TAG, `player.seek= ${currentMs}`);

            PlayerModel.seek(currentMs);

          };

        })



      Row() {

        ForEach(this.imageArrays, (item: Resource, index: number | undefined) => {

          Column() {

            Image(item)

              .size({ width: 74, height: 74 })

              .objectFit(ImageFit.Contain)

              .onClick(() => {

                switch (index) {

                  case 0:

                    this.onAppSharedClick();

                    break;

                  case 1:

                    this.onPreviousClick();

                    break;

                  case 2:

                    this.onPlayClick();

                    break;

                  case 3:

                    this.onNextClick();

                    break;

                  default:

                    break;

                }

              })

          }

          .id('image' + (index !== undefined ? (index + 1) : 0))

          .width(100)

          .height(100)

          .alignItems(HorizontalAlign.Center)

          .justifyContent(FlexAlign.Center)

        })



      }

      .width('100%')

      .margin({ top: '4%' })

      .justifyContent(FlexAlign.SpaceEvenly)

    }

    .width('100%')

    .height('100%')

    .backgroundImage($r('app.media.bg_blurry'))

    .backgroundImageSize({ width: '100%', height: '100%' })

  }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373

分布式数据管理

(1) 管理分布式数据库
创建一个KVManager对象实例，用于管理分布式数据库对象。通过distributedData.createKVManager(config)，并通过指定Options和storeId，创建并获取KVStore数据库，并通过Promise方式返回，此方法为异步方法，例如this.kvManager.getKVStore(STORE_ID, options).then((store) => {})
(2) 订阅分布式数据变化
通过订阅分布式数据库所有（本地及远端）数据变化实现数据协同[源码参考]。

/*

 * Copyright (c) 2022-2023 Huawei Device Co., Ltd.

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';

import display from '@ohos.display';

import common from '@ohos.app.ability.common';

import mediaQuery from '@ohos.mediaquery';

import rpc from '@ohos.rpc';

import Want from '@ohos.app.ability.Want';

import PermissionRequestResult from 'security/PermissionRequestResult';

import KvStoreModel from '../model/KvStoreModel';

import Logger from '../model/Logger';

import PlayerModel from '../model/PlayerModel';

import deviceManager from '@ohos.distributedDeviceManager';

import ability from '@ohos.ability.ability';

import { RemoteDeviceModel } from '../model/RemoteDeviceModel';

import { DeviceDialog } from '../common/DeviceDialog';

import {

  APPLICATION_BUNDLE_NAME,

  APPLICATION_SERVICE_NAME,

  MusicSharedEventCode,

  MusicSharedStatus,

  MusicConnectEvent

} from '../common/MusicSharedDefinition';



const TAG: string = 'Index';

const DESIGN_WIDTH: number = 720.0;

const SYSTEM_UI_HEIGHT: number = 134;

const DESIGN_RATIO: number = 16 / 9;

const ONE_HUNDRED: number = 100;

const ONE_THOUSAND: number = 1000;

const SIXTY: number = 60;

const REMOTE_ABILITY_STARTED: string = 'remoteAbilityStarted';

const ABILITY_SHARED_BUTTON = 0;

const DEFAULT_NUM = -1;

const PREVIOUS_CLICK = 2;



interface Params {

  uri: string,

  seekTo: number,

  isPlaying: boolean

};



@Entry

@Component

 struct Index {

  private listener = mediaQuery.matchMediaSync('screen and (min-aspect-ratio: 1.5) or (orientation: landscape)');

  @State isLand: boolean = false;

  @State currentTimeText: string = '';

  @State currentProgress: number = 0;

  @State totalMs: number = 0;

  @State riscale: number = 1;

  @State risw: number = 720;

  @State rish: number = 1280;

  @State isSwitching: boolean = false;

  @State deviceLists: Array<deviceManager.DeviceBasicInfo> = [];

  @State isDialogShowing: boolean = false;

  @State isDistributed: boolean = false;

  @State title: string = '';

  @State totalTimeText: string = '00:00';

  @State albumSrc: Resource = $r('app.media.album');

  @State selectedIndex: number = 0;

  @State imageArrays: Array<Resource> = [$r('app.media.ic_hop'), $r('app.media.ic_play_previous'), $r('app.media.ic_play'), $r('app.media.ic_play_next')];

  private dialogController: CustomDialogController | null = null;

  @StorageLink('exitMusicApp') @Watch('exitMusicApp') isExitMusicApp: boolean = false;

  @StorageLink('remoteServiceExtensionConnectEvent') @Watch('remoteServiceExtensionConnectEvent') isRemoteServiceExtensionConnectEvent: boolean = false;

  @StorageLink('musicPlay') @Watch('musicPlay') isMusicPlay: boolean = false;

  @StorageLink('musicPause') @Watch('musicPause') isMusicPause: boolean = false;

  private remoteDeviceModel: RemoteDeviceModel = new RemoteDeviceModel();

  private context: common.UIAbilityContext | null = null;

  private deviceId: string | null = null;

  private clickFlag = MusicSharedStatus.MUSIC_SHARED;

  private localExtensionRemote: rpc.IRemoteObject | null = null;

  onLand = (mediaQueryResult: mediaQuery.MediaQueryResult) => {

    Logger.info(TAG, `onLand: mediaQueryResult.matches= ${mediaQueryResult.matches}`);

    if (mediaQueryResult.matches) {

      this.isLand = true;

    } else {

      this.isLand = false;

    };

  };



  showDialog() {

    this.remoteDeviceModel.registerDeviceListCallback(() => {

      Logger.info(TAG, 'registerDeviceListCallback, callback entered');

      this.deviceLists = [];

      this.deviceLists.push({

        deviceId: '0',

        deviceName: 'local device',

        deviceType: '0',

        networkId: ''

      });

      let deviceTempList = this.remoteDeviceModel.discoverLists.length > 0 ? this.remoteDeviceModel.discoverLists : this.remoteDeviceModel.deviceLists;

      for (let i = 0; i < deviceTempList.length; i++) {

        Logger.info(TAG, `device ${i}/${deviceTempList.length} deviceId= ${deviceTempList[i].deviceId},

         deviceName= ${deviceTempList[i].deviceName}, deviceType= ${deviceTempList[i].deviceType}`);

        this.deviceLists.push(deviceTempList[i]);

        Logger.info(TAG, 'deviceLists push end');

      };

      Logger.info(TAG, 'CustomDialogController start');

      if (this.dialogController !== null) {

        this.dialogController.close();

        this.dialogController = null;

      }

      this.dialogController = new CustomDialogController({

        builder: DeviceDialog({

          deviceLists: this.deviceLists,

          selectedIndex: this.selectedIndex,

          selectedIndexChange: this.selectedIndexChange

        }),

        autoCancel: true,

        customStyle: true

      });

      this.dialogController.open();

      Logger.info(TAG, 'CustomDialogController end');

    })

  };



  showPromptDialog(title: ResourceStr, str: ResourceStr) {

    AlertDialog.show({

      title: title,

      message: str,

      confirm: {

        value: $r('app.string.cancel'),

        action: () => {

          Logger.info(TAG, `Button-clicking callback`);

        }

      },

      cancel: () => {

        Logger.info(TAG, `Closed callbacks`);

      }

    });

  };



  remoteServiceExtensionConnectEvent(event: string) {

    if (typeof (event) === 'string') {

      let viewThis = AppStorage.get<Index>('viewThis');

      if (viewThis !== undefined) {

        if (event === MusicConnectEvent.EVENT_CONNECT) {

          viewThis.clickFlag = MusicSharedStatus.MUSIC_STOP_SHARED;

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          Logger.info(TAG, 'remote service on connect callbacked');

        } else if (event === MusicConnectEvent.EVENT_DISCONNECT) {

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.onDisconnectService'));

        } else if (event === MusicConnectEvent.EVENT_FAILED) {

          viewThis.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.onFailedService'));

        } else if (event === MusicConnectEvent.EVENT_TIMEOUT) {

          this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

          viewThis.clickFlag = MusicSharedStatus.MUSIC_SHARED;

          viewThis.showPromptDialog($r('app.string.ConnectRemoteDevices'), $r('app.string.ConnectionTimeout'));

        }

      }

    } else {

      Logger.info(TAG, 'event is not a string');

    };

  };



  musicPause() {

    Logger.info(TAG, 'music pause recv');

    PlayerModel.pause();

    let viewThis = AppStorage.get<Index>('viewThis');

    viewThis!.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

  };



  musicPlay() {

    Logger.info(TAG, 'music play recv');

    PlayerModel.play(DEFAULT_NUM, true);

    let viewThis = AppStorage.get<Index>('viewThis');

    viewThis!.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

  };



  exitMusicApp() {

    Logger.info(TAG, `exit music app called`);

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      this.localExtensionRemote.sendRequest(

        MusicSharedEventCode.STOP_LOCAL_SERIVCE,

        data,

        reply,

        option);

    } else {

      Logger.info(TAG, `Remote start type is error or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  connectLocalExtension() {

    let localServiceWant: Want = {

      bundleName: APPLICATION_BUNDLE_NAME,

      abilityName: APPLICATION_SERVICE_NAME,

    };

    let connectOptions: ability.ConnectOptions = {

      onConnect: (elementName, remote) => {

        this.localExtensionRemote = remote;

        Logger.info(TAG, `onConnect called elementName is ${JSON.stringify(elementName)}`);

      },

      onDisconnect: (elementName) => {

        if (this.context !== null) {

          this.context.terminateSelf();

          Logger.info(TAG, `OnDisconnect called elementName is ${JSON.stringify(elementName)}`);

        };

      },

      onFailed: (code) => {

        if (this.context !== null) {

          this.context.terminateSelf();

          Logger.info(TAG, `OnFailed called code is ${JSON.stringify(code)}`);

        }

      }

    };

    if (this.context !== null) {

      this.context.connectServiceExtensionAbility(localServiceWant, connectOptions);

    };

  };



  startRemoteExtension(deviceId: string, params: object) {

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object' && typeof (deviceId) === 'string' && deviceId !== '') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      data.writeString(deviceId);

      data.writeString(JSON.stringify(params));

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.START_DISTRIBUTED_MUSIC_SERVICE, data, reply, option);

      this.deviceId = deviceId;

      this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

    } else {

      Logger.info(TAG, `Remote start type is error or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  stopRemoteExtension() {

    if (this.localExtensionRemote !== null && typeof (this.localExtensionRemote) === 'object' && typeof (this.deviceId) === 'string' && this.deviceId !== '') {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      data.writeString(this.deviceId);

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.STOP_DISTRIBUTED_MUSIC_SERVICE, data, reply, option);

      this.deviceId = '';

    } else {

      Logger.info(TAG, `Remote stopped type is wrong or deviceID is empty, typeof= ${typeof (this.localExtensionRemote)}`);

    };

  };



  sendMessagePlay() {

    if (this.localExtensionRemote !== null) {

      let option = new rpc.MessageOption();

      let data = new rpc.MessageParcel();

      let reply = new rpc.MessageParcel();

      this.localExtensionRemote.sendRequest(MusicSharedEventCode.PLAY_MUSIC_SERVICE, data, reply, option);

      Logger.info(TAG, `onPlayClick send mssage success`);

    } else {

      Logger.info(TAG, `can not get proxy`);

      return;

    };

  };



  sendMessagePause() {

    if (this.localExtensionRemote === null) {

      Logger.info(TAG, `can not get proxy`);

      return;

    };

    let option = new rpc.MessageOption();

    let data = new rpc.MessageParcel();

    let reply = new rpc.MessageParcel();



    this.localExtensionRemote.sendRequest(MusicSharedEventCode.PAUSE_MUSIC_SERVICE, data, reply, option);

    Logger.info(TAG, `onPauseClick send mssage success`);

  };



  onBackPress() {

    if (this.isDialogShowing === true) {

      this.dismissDialog();

      return true;

    };

    return false;

  };



  onPageHide() {

    if (this.isDialogShowing === true) {

      this.dismissDialog();

      return true;

    };

    return false;

  };



  dismissDialog() {

    if (this.dialogController !== null) {

      this.dialogController.close();

    }

    this.remoteDeviceModel.unregisterDeviceListCallback();

    this.isDialogShowing = false;

  };



  startAbilityContinuation(deviceId: string) {

    let params: Params = {

      uri: '',

      seekTo: 0,

      isPlaying: false

    };

    Logger.info(TAG, `startAbilityContinuation PlayerModel.index= ${PlayerModel.index}/${PlayerModel.playlist.audioFiles.length}`);

    if (PlayerModel.index >= 0 && PlayerModel.index <= PlayerModel.playlist.audioFiles.length) {

      params = {

        uri: PlayerModel.playlist.audioFiles[PlayerModel.index].fileUri,

        seekTo: PlayerModel.getCurrentMs(),

        isPlaying: PlayerModel.isPlaying

      };

    };

    Logger.info(TAG, `context.startAbility deviceId= ${deviceId}`);

    if (this.context !== null) {

      KvStoreModel.setOnMessageReceivedListener(this.context, REMOTE_ABILITY_STARTED, () => {

        Logger.info(TAG, 'OnMessageReceived, terminateSelf');

      });

    };

    Logger.info(TAG, `context.startAbility start`);

    this.clickFlag = MusicSharedStatus.MUSIC_REMOTING;

    this.startRemoteExtension(deviceId, params);

    this.clearSelectState();

    Logger.info(TAG, 'context.startAbility end');

  };



  selectedIndexChange = (selectedIndex: number) => {

    if (this.context !== null && selectedIndex === 0) {

      this.context.startAbility({ bundleName: 'ohos.samples.distributedmusicplayer',

        abilityName: 'ohos.samples.distributedmusicplayer.MainAbility',

        deviceId: this.deviceLists[selectedIndex].deviceId,

        parameters: {

          isFA: 'EXIT'

        }

      }).then(() => {

        Logger.info(TAG, `startAbility finished`);

      }).catch((err: Error) => {

        Logger.info(TAG, `startAbility filed error = ${JSON.stringify(err)}`);

      });

      this.isDistributed = false;

      this.selectedIndex = 0;

      if (this.dialogController !== null) {

        this.dialogController.close();

      }

      this.deviceLists = [];

      return;

    };

    this.selectedIndex = selectedIndex;

    this.selectDevice();

  };



  selectDevice() {

    Logger.info(TAG, 'start ability ......');

    if (this.selectedIndex !== undefined && (this.remoteDeviceModel === null || this.remoteDeviceModel.discoverLists.length <= 0)) {

      Logger.info(TAG, `start ability device:${JSON.stringify(this.deviceLists)}`);

      this.startAbilityContinuation(this.deviceLists[this.selectedIndex].networkId as string);

      this.clearSelectState();

      return;

    };

    Logger.info(TAG, 'start ability, needAuth');

    if (this.selectedIndex !== undefined){

      this.remoteDeviceModel.authDevice(this.deviceLists[this.selectedIndex], (device: deviceManager.DeviceBasicInfo) => {

        Logger.info(TAG, 'auth and online finished');

        this.startAbilityContinuation(device.networkId);

      });

    }

    Logger.info(TAG, 'start ability2 ......');

    this.clearSelectState();

  };



  clearSelectState() {

    this.deviceLists = [];

    if (this.dialogController) {

      this.dialogController.close();

      this.dialogController = null;

    };

  };



  getShownTimer(ms: number) {

    let minStr: string;

    let secStr: string;

    let seconds = Math.floor(ms / ONE_THOUSAND);

    let sec = seconds % SIXTY;

    Logger.info(TAG, `getShownTimer sec = ${sec}`);

    let min = (seconds - sec) / SIXTY;

    Logger.info(TAG, `getShownTimer min = ${min}`);

    if (sec < 10) {

      secStr = '0' + sec;

    } else {

      secStr = sec.toString(10);

    };

    if (min < 10) {

      minStr = '0' + min;

    } else {

      minStr = min.toString(10);

    };

    Logger.warn(TAG, `getShownTimer = ${minStr}:${secStr}`);

    return minStr + ':' + secStr;

  };



  refreshSongInfo(index: number) {

    Logger.info(TAG, `refreshSongInfo ${index}/${PlayerModel.playlist.audioFiles.length}`);

    if (index >= PlayerModel.playlist.audioFiles.length) {

      Logger.warn(TAG, 'refreshSongInfo ignored');

      return;

    };

    // update song title

    this.title = PlayerModel.playlist.audioFiles[index].name;

    this.albumSrc = (index % 2 === 0) ? $r('app.media.album') : $r('app.media.album2');



    // update duration

    this.totalMs = PlayerModel.getDuration();

    this.totalTimeText = this.getShownTimer(this.totalMs);

    this.currentTimeText = this.getShownTimer(PlayerModel.getCurrentMs());

    Logger.info(TAG, `refreshSongInfo this.title= ${this.title}, this.totalMs= ${this.totalMs}, this.totalTimeText= ${this.totalTimeText},this.currentTimeText= ${this.currentTimeText}`);

  };



  onAppSharedClick() {

    if (this.clickFlag === MusicSharedStatus.MUSIC_SHARED) {

      Logger.info(TAG, `1start button is ${JSON.stringify(this.imageArrays[ABILITY_SHARED_BUTTON])}`);

      this.showDialog();

    } else if (this.clickFlag === MusicSharedStatus.MUSIC_STOP_SHARED) {

      Logger.info(TAG, `2start button is ${JSON.stringify(this.imageArrays[ABILITY_SHARED_BUTTON])}`);

      this.stopRemoteExtension();

      this.imageArrays[ABILITY_SHARED_BUTTON] = $r('app.media.ic_hop');

    };

  };



  onPreviousClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onPreviousClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, 'onPreviousClick');

    PlayerModel.index--;

    if (PlayerModel.index < 0 && PlayerModel.playlist.audioFiles.length >= 1) {

      PlayerModel.index = PlayerModel.playlist.audioFiles.length - 1;

    };

    this.currentProgress = 0;

    this.isSwitching = true;



    PlayerModel.preLoad(PlayerModel.index, () => {

      this.refreshSongInfo(PlayerModel.index);

      PlayerModel.play(0, true);

      if (PlayerModel.isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      };

      this.isSwitching = false;

    });

  };



  onNextClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onNextClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, 'onNextClick');

    PlayerModel.index++;

    if (PlayerModel.index >= PlayerModel.playlist.audioFiles.length) {

      PlayerModel.index = 0;

    };

    this.currentProgress = 0;

    this.isSwitching = true;

    PlayerModel.preLoad(PlayerModel.index, () => {

      this.refreshSongInfo(PlayerModel.index);

      PlayerModel.play(0, true);

      if (PlayerModel.isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      };

      this.isSwitching = false;

    });

  };



  onPlayClick() {

    if (this.isSwitching) {

      Logger.info(TAG, 'onPlayClick ignored, isSwitching');

      return;

    };

    Logger.info(TAG, `onPlayClick isPlaying= ${PlayerModel.isPlaying}`);

    if (PlayerModel.isPlaying) {

      PlayerModel.pause();

      this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

      this.sendMessagePause();

    } else {

      PlayerModel.preLoad(PlayerModel.index, () => {

        PlayerModel.play(DEFAULT_NUM, true);

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

        this.sendMessagePlay();

      })

    };

  };



  restoreFromWant() {

    Logger.info(TAG, 'restoreFromWant');

    let status: Record<string, Object> | undefined = AppStorage.get('status');

    if (status !== undefined && status !== null && status.uri !== null) {

      KvStoreModel.broadcastMessage(this.context, REMOTE_ABILITY_STARTED);

      Logger.info(TAG, 'restorePlayingStatus');

      PlayerModel.restorePlayingStatus(status, (index: number) => {

        Logger.info(TAG, `restorePlayingStatus finished, index= ${index}`);

        if (index >= 0) {

          this.refreshSongInfo(index);

        } else {

          PlayerModel.preLoad(0, () => {

            this.refreshSongInfo(0);

          })

        }

        if (status !== undefined) {

          Logger.info(TAG, `Index PlayerModel.restorePlayingStatus this.totalMs = ${this.totalMs}, status.seekTo = ${status.seekTo}`);

          this.currentProgress = Math.floor(Number(status.seekTo) / this.totalMs * ONE_HUNDRED);

        }

      })

    } else {

      PlayerModel.preLoad(0, () => {

        this.refreshSongInfo(0);

      });

    }

  };



  aboutToAppear() {

    Logger.info(TAG, `begin`);

    Logger.info(TAG, 'grantPermission');

    this.context = getContext(this) as common.UIAbilityContext;

    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();

    let permission: Array<Permissions> = ['ohos.permission.DISTRIBUTED_DATASYNC'];

    try {

      atManager.requestPermissionsFromUser(this.context, permission).then((data: PermissionRequestResult) => {

        Logger.info(TAG, `data: ${JSON.stringify(data)}`);

      }).catch((err: object) => {

        Logger.info(TAG, `err: ${JSON.stringify(err)}`);

      })

    } catch (err) {

      Logger.info(TAG, `catch err->${JSON.stringify(err)}`);

    }

    display.getDefaultDisplay().then((dis: display.Display) => {

      Logger.info(TAG, `getDefaultDisplay dis= ${JSON.stringify(dis)}`);

      let proportion = DESIGN_WIDTH / dis.width;

      let screenWidth = DESIGN_WIDTH;

      let screenHeight = (dis.height - SYSTEM_UI_HEIGHT) * proportion;

      this.riscale = (screenHeight / screenWidth) / DESIGN_RATIO;

      if (this.riscale < 1) {

        // The screen ratio is shorter than design ratio

        this.risw = screenWidth * this.riscale;

        this.rish = screenHeight;

      } else {

        // The screen ratio is longer than design ratio

        this.risw = screenWidth;

        this.rish = screenHeight / this.riscale;

      }

      Logger.info(TAG, `proportion=${proportion} , screenWidth= ${screenWidth},

      screenHeight= ${screenHeight} , riscale= ${this.riscale} , risw= ${this.risw} , rish= ${this.rish}`);

    })

    Logger.info(TAG, 'getDefaultDisplay end');

    this.currentTimeText = this.getShownTimer(0);

    PlayerModel.setOnStatusChangedListener((isPlaying: string) => {

      Logger.info(TAG, `on player status changed, isPlaying= ${isPlaying} refresh ui`);

      PlayerModel.setOnPlayingProgressListener((currentTimeMs: number) => {

        this.currentTimeText = this.getShownTimer(currentTimeMs);

        this.currentProgress = Math.floor(currentTimeMs / this.totalMs * ONE_HUNDRED);

      });

      if (isPlaying) {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_pause');

      } else {

        this.imageArrays[PREVIOUS_CLICK] = $r('app.media.ic_play');

      }

    });



    PlayerModel.getPlaylist(() => {

      Logger.info(TAG, 'on playlist generated, refresh ui');

      this.restoreFromWant();

    });



    AppStorage.setOrCreate('viewThis', this);



    this.connectLocalExtension();

  };



  aboutToDisappear() {

    Logger.info(TAG, `aboutToDisappear begin`)

    if (PlayerModel === undefined) {

      return

    }

    PlayerModel.release()

    this.remoteDeviceModel.unregisterDeviceListCallback()

    this.dialogController = null

    KvStoreModel.deleteKvStore()

    Logger.info(TAG, `aboutToDisappear end`)

  };



  build() {

    Column() {

      Blank()

        .width('100%')

        .height(72)

      Text(this.title)

        .width('100%')

        .fontSize(28)

        .margin({ top: '10%' })

        .fontColor(Color.White)

        .textAlign(TextAlign.Center)

      Image(this.albumSrc)

        .width(this.isLand ? '60%' : '89%')

        .objectFit(ImageFit.Contain)

        .margin({ top: 50, left: 40, right: 40 })

      Row() {

        Text(this.currentTimeText)

          .fontSize(20)

          .fontColor(Color.White)

        Blank()

        Text(this.totalTimeText)

          .fontSize(20)

          .fontColor(Color.White)

      }

      .width('90%')

      .margin({ top: '12%' })



      Slider({ value: typeof (this.currentProgress) === 'number' ? this.currentProgress : 0 })

        .trackColor('#64CCE7FF')

        .width('90%')

        .selectedColor('#ff0c4ae7')

        .onChange((value: number, mode: SliderChangeMode) => {

          this.currentProgress = value;

          if (typeof (this.totalMs) !== 'number') {

            this.currentProgress = 0;

            Logger.info(TAG, `setProgress ignored, totalMs= ${this.totalMs}`);

            return;

          };

          let currentMs = this.currentProgress / ONE_HUNDRED * this.totalMs;

          this.currentTimeText = this.getShownTimer(currentMs);

          if (mode === SliderChangeMode.End || mode === 3) {

            Logger.info(TAG, `player.seek= ${currentMs}`);

            PlayerModel.seek(currentMs);

          };

        })



      Row() {

        ForEach(this.imageArrays, (item: Resource, index: number | undefined) => {

          Column() {

            Image(item)

              .size({ width: 74, height: 74 })

              .objectFit(ImageFit.Contain)

              .onClick(() => {

                switch (index) {

                  case 0:

                    this.onAppSharedClick();

                    break;

                  case 1:

                    this.onPreviousClick();

                    break;

                  case 2:

                    this.onPlayClick();

                    break;

                  case 3:

                    this.onNextClick();

                    break;

                  default:

                    break;

                }

              })

          }

          .id('image' + (index !== undefined ? (index + 1) : 0))

          .width(100)

          .height(100)

          .alignItems(HorizontalAlign.Center)

          .justifyContent(FlexAlign.Center)

        })



      }

      .width('100%')

      .margin({ top: '4%' })

      .justifyContent(FlexAlign.SpaceEvenly)

    }

    .width('100%')

    .height('100%')

    .backgroundImage($r('app.media.bg_blurry'))

    .backgroundImageSize({ width: '100%', height: '100%' })

  }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373

跨设备播放操作

(1)分布式设备管理器绑定应用包 deviceManager.createDeviceManager(‘ohos.samples.distributedmusicplayer’) [源码参考]。

/*

* Copyright (c) 2022 Huawei Device Co., Ltd.

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

*     http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/



import deviceManager from '@ohos.distributedDeviceManager';

import Logger from '../model/Logger';



let SUBSCRIBE_ID: number = 100;

const RANDOM: number = 65536;

const TAG: string = 'RemoteDeviceModel';



export class RemoteDeviceModel {

  public deviceLists: Array<deviceManager.DeviceBasicInfo> = [];

  public discoverLists: Array<deviceManager.DeviceBasicInfo> = [];

  private callback: () => void = null;

  private authCallback: () => void = null;

  private deviceManager: deviceManager.DeviceManager = undefined;



  registerDeviceListCallback(callback) {

    if (typeof (this.deviceManager) === 'undefined') {

      Logger.info(TAG, 'deviceManager.createDeviceManager begin');

      try {

        this.deviceManager = deviceManager.createDeviceManager('ohos.samples.distributedmusicplayer');

        this.registerDeviceList(callback);

        Logger.info(TAG, `createDeviceManager callback returned, value= ${JSON.stringify(this.deviceManager)}`);

      } catch (error) {

        Logger.info(TAG, `createDeviceManager throw error, error=${error} message=${error.message}`);

      }

      Logger.info(TAG, 'deviceManager.createDeviceManager end');

    } else {

      this.registerDeviceList(callback);

    };

  };



  registerDeviceList(callback) {

    Logger.info(TAG, 'registerDeviceListCallback');

    this.callback = callback;

    if (this.deviceManager === undefined) {

      Logger.error(TAG, 'deviceManager has not initialized');

      this.callback();

      return;

    };



    Logger.info(TAG, 'getTrustedDeviceListSync begin');

    let list: deviceManager.DeviceBasicInfo[] = [];

    try {

      list = this.deviceManager.getAvailableDeviceListSync();

    } catch (error) {

      Logger.info(TAG, `getTrustedDeviceListSync throw error, error=${error} message=${error.message}`);

    };

    Logger.info(TAG, `getTrustedDeviceListSync end, deviceLists= ${JSON.stringify(list)}`);

    if (typeof (list) !== 'undefined' && typeof (list.length) !== 'undefined') {

      this.deviceLists = list;

    };

    this.callback();

    Logger.info(TAG, 'callback finished');



    try {

      this.deviceManager.on('deviceStateChange', (data) => {

        Logger.info(TAG, `deviceStateChange data= ${JSON.stringify(data)}`);

        switch (data.action) {

          case deviceManager.DeviceStateChange.AVAILABLE:

            this.discoverLists = [];

            this.deviceLists.push(data.device);

            Logger.info(TAG, `reday, updated device list= ${JSON.stringify(this.deviceLists)} `);

            let list: deviceManager.DeviceBasicInfo[] = [];

            try {

              list = this.deviceManager.getAvailableDeviceListSync();

            } catch (err) {

              Logger.info(TAG, `this err is ${JSON.stringify(err)}`);

            }

            Logger.info(TAG, `getTrustedDeviceListSync end, deviceList= ${JSON.stringify(list)}`);

            if (typeof (list) !== 'undefined' && typeof (list.length) !== 'undefined') {

              this.deviceLists = list;

            }

            this.callback();

            break;

          case deviceManager.DeviceStateChange.UNAVAILABLE:

            if (this.deviceLists.length > 0) {

              let list = [];

              for (let i = 0; i < this.deviceLists.length; i++) {

                if (this.deviceLists[i].deviceId !== data.device.deviceId) {

                  list[i] = data.device;

                };

              };

              this.deviceLists = list;

            };

            Logger.info(TAG, `offline, updated device list= ${JSON.stringify(this.deviceLists)}`);

            this.callback();

            break;

          default:

            break;

        };

      });

      this.deviceManager.on('discoverSuccess', (data) => {

        Logger.info(TAG, `discoverSuccess data= ${JSON.stringify(data)}`);

        Logger.info(TAG, `discoverSuccess this.deviceLists= ${this.deviceLists}, this.deviceLists.length= ${this.deviceLists.length}`);

        for (let i = 0;i < this.discoverLists.length; i++) {

          if (this.discoverLists[i].deviceId === data.device.deviceId) {

            Logger.info(TAG, 'device founded, ignored');

            return;

          };

        };

        this.discoverLists[this.discoverLists.length] = data.device;

        this.callback();

      });

      this.deviceManager.on('discoverFailure', (data) => {

        Logger.info(TAG, `discoverFailure data= ${JSON.stringify(data)}`);

      });

      this.deviceManager.on('serviceDie', () => {

        Logger.error(TAG, 'serviceDie');

      });

    } catch (error) {

      Logger.info(TAG, `on throw error, error=${error} message=${error.message}`);

    }



    let discoverParam = {

      'discoverTargetType': 1

    };

    let filterOptions = {

      'availableStatus': 0

    };

    Logger.info(TAG, `startDiscovering ${SUBSCRIBE_ID}`);

    try {

      if (this.deviceManager !== null) {

        this.deviceManager.startDiscovering(discoverParam, filterOptions);

      };

    } catch (error) {

      Logger.error(TAG, `startDiscovering throw error, error=${error} message=${error.message}`);

    };

  };



  authDevice(device, callback) {

    Logger.info(TAG, `authDevice ${device}`);

    if (device !== undefined) {

      for (let i = 0; i < this.discoverLists.length; i++) {

        if (this.discoverLists[i].deviceId === device.deviceId) {

          Logger.info(TAG, 'device founded, ignored');

          let bindParam = {

            bindType: 1,

            targetPkgName: 'ohos.samples.distributedmusicplayer',

            appName: 'Music',

          };

          Logger.info(TAG, `authenticateDevice ${JSON.stringify(this.discoverLists[i])}`);

          try {

            this.deviceManager.bindTarget(device.deviceId, bindParam, (err, data) => {

              if (err) {

                Logger.error(TAG, `authenticateDevice error: ${JSON.stringify(err)}`);

                this.authCallback = () => {

                };

                return;

              };

              Logger.info(TAG, `authenticateDevice succeed, data= ${JSON.stringify(data)}`);

              this.authCallback = callback;

            });

          } catch (error) {

            Logger.error(TAG, `authenticateDevice throw error, error=${JSON.stringify(error)} message=${error.message}`);

          }

        }

      }

    }

  };



  unregisterDeviceListCallback() {

    Logger.info(TAG, `stopDiscovering ${SUBSCRIBE_ID}`);

    if (this.deviceManager === undefined) {

      return;

    };

    try {

      this.deviceManager.stopDiscovering();

      this.deviceManager.off('deviceStateChange');

      this.deviceManager.off('discoverSuccess');

      this.deviceManager.off('discoverFailure');

      this.deviceManager.off('serviceDie');

    } catch (error) {

      Logger.info(TAG, `stopDeviceDiscovery throw error, error=${error} message=${error.message}`);

    }

    this.deviceLists = [];

  };

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381

(2) 初始化播放器 构造函数中通过’@ohos.multimedia.media’组件对播放器进行实例化，并调用播放器初始化函数，通过播放器的on函数，监听error、finish、timeUpdate
(3) 同步当前播放数据 播放器通过调用selectedIndexChange(),将当前播放的资源、时间、以及播放状态同步给选中的设备。
(4) 接收当前播放数据 播放器通过在aboutToAppear()时调用this.restoreFromWant(), KvStoreModel组件获取播放列表，playerModel组件重新加载播放器状态和资源。