Daydream VR入门基础教程，通过GVR示例SimpleVrPanorama制作VR全景图形应用_import com.google.vr.sdk.widgets.pano.vrpanoramaev

SimpleVrPanorama例子介绍

VR view简单介绍

源码研究

    <application android:label="SimpleVrPanoramaActivity"
      android:largeHeap="true"
      android:theme="@android:style/Theme.Holo.Light">
        <!-- This demo is singleTask since it makes launching via custom adb intents easier. -->
        <activity android:name=".SimpleVrPanoramaActivity"
          android:launchMode="singleTask">
            <intent-filter>
                <!-- Primary intent when launching from the home screen -->
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="com.google.intent.category.CARDBOARD" />
            </intent-filter>
        </activity>
    </application>
 
    <!-- These permissions are used by Google VR SDK to get the best Google VR headset profiles. !-->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<com.google.vr.sdk.widgets.pano.VrPanoramaView
            android:id="@+id/pano_view"
            android:layout_margin="5dip"
            android:layout_width="match_parent"
            android:scrollbars="@null"
            android:layout_height="250dip"/>

dependencies {
    compile project(':libraries-common') //Google VR API的公共代码。
    compile project(':libraries-commonwidget') //Google VR API的公共组件。
    compile project(':libraries-panowidget') //VR全景视图组件
 
    compile 'com.google.protobuf.nano:protobuf-javanano:3.0.0-alpha-7' //序列化数据结构的方案
}

package com.google.vr.sdk.samples.simplepanowidget;
 
import android.app.Activity;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.util.Pair;
 
import com.google.vr.sdk.widgets.pano.VrPanoramaEventListener;
import com.google.vr.sdk.widgets.pano.VrPanoramaView;
import com.google.vr.sdk.widgets.pano.VrPanoramaView.Options;
 
import java.io.IOException;
import java.io.InputStream;
 
public class SimpleVrPanoramaActivity extends Activity {
 
    private static final String TAG = "SimpleVrPanoramaActivity";
    private VrPanoramaView panoWidgetView;//VR全景图形组件
    private String fileUri = "andes.jpg";//assets文件夹下的文件名
 
    private Options panoOptions = new Options();//VrPanoramaView需要的设置
    private ImageLoaderTask backgroundImageLoaderTask;//异步加载图片
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);//获取布局
 
        panoWidgetView = (VrPanoramaView) findViewById(R.id.pano_view);//初始化VrPanoramaView
        panoWidgetView.setEventListener(new ActivityEventListener());//为VrPanoramaView添加监听
 
        //如果有任务在执行则停止它
        if (backgroundImageLoaderTask != null) {
            backgroundImageLoaderTask.cancel(true);
        }
         //设置inputType 为TYPE_STEREO_OVER_UNDER. 在后面会介绍TYPE_STEREO_OVER_UNDER的，暂时当做一个图片的显示类型就行
        panoOptions.inputType = Options.TYPE_STEREO_OVER_UNDER;
        //创建图片异步加载任务
        backgroundImageLoaderTask = new ImageLoaderTask();
        //执行任务。将图片名（根据项目实际情况传吧）和设置传入
        backgroundImageLoaderTask.execute(Pair.create(fileUri, panoOptions));
    }
    //异步任务
    class ImageLoaderTask extends AsyncTask<Pair<String, Options>, Void, Boolean> {
        @Override
        protected Boolean doInBackground(Pair<String, Options>... fileInformation) {//真正写项目根据情况添加条件判断吧
 
            InputStream istr = null;
            try {
                istr = getAssets().open(fileInformation[0].first);//获取图片的输入流
            } catch (IOException e) {
                Log.e(TAG, "Could not decode default bitmap: " + e);
                return false;
            }
 
            Bitmap bitmap = BitmapFactory.decodeStream(istr);//创建bitmap
            panoWidgetView.loadImageFromBitmap(bitmap, fileInformation[0].second);//参数一为图片的bitmap，参数二为 VrPanoramaView 所需要的设置
 
            try {
                istr.close();//关闭InputStream
            } catch (IOException e) {
                Log.e(TAG, "Could not close input stream: " + e);
            }
 
            return true;
        }
    }
 
    private class ActivityEventListener extends VrPanoramaEventListener {
 
        @Override
        public void onLoadSuccess() {//图片加载成功
            Log.e(TAG, "onLoadSuccess");
        }
 
 
        @Override
        public void onLoadError(String errorMessage) {//图片加载失败
            Log.e(TAG, "Error loading pano: " + errorMessage);
        }
 
        @Override
        public void onClick() {//当我们点击了VrPanoramaView 时候出发
            super.onClick();
            Log.e(TAG, "onClick");
        }
 
        @Override
        public void onDisplayModeChanged(int newDisplayMode) {//改变显示模式时候出发（全屏模式和纸板模式）
            super.onDisplayModeChanged(newDisplayMode);
            Log.e(TAG, "onDisplayModeChanged");
        }
    }
 
 
    @Override
    protected void onPause() {
        panoWidgetView.pauseRendering();//暂停3D渲染和跟踪
        super.onPause();
    }
 
    @Override
    protected void onResume() {
        super.onResume();
        panoWidgetView.resumeRendering();//恢复3D渲染和跟踪
    }
 
    @Override
    protected void onDestroy() {
        panoWidgetView.shutdown();//关闭渲染下并释放相关的内存
 
        if (backgroundImageLoaderTask != null) {
            backgroundImageLoaderTask.cancel(true);//停止异步任务
        }
        super.onDestroy();
    }
}

panoWidgetView.setFullscreenButtonEnabled(false); // 是否启用全屏按钮
panoWidgetView.setStereoModeButtonEnabled(false); // 是否启用纸盒按钮

//图像被预期以覆盖沿着其水平轴360度，而垂直范围是根据图像的宽高比来计算。例如，如果一个1000x250像素的图像，给出所述全景将覆盖360x90度与垂直范围是-45至+45度。
public static final int TYPE_MONO = 1;
      
//包含两个大小相等的投影 全景图垂直叠加。顶部图像被显示给左眼、底部图像被显示给右眼。   
图像将覆盖沿水平轴360度，而垂直范围是根据图像的宽高比来计算。例如，如果一个1000x500像素的图像中给出（即1000x250像素每个眼睛），全景将覆盖360x90度与垂直范围是-45至+45度。
public static final int TYPE_STEREO_OVER_UNDER = 2;

public static class Options {
        private static final int TYPE_START_MARKER = 0;//起始标记
        public static final int TYPE_MONO = 1;
        public static final int TYPE_STEREO_OVER_UNDER = 2;
        private static final int TYPE_END_MARKER = 3;//结束标记
        public int inputType = 1;//默认为一
 
        public Options() {
        }
 
        void validate() {
            if(this.inputType <= 0 || this.inputType >= 3) {//标记错误处理
                String var10000 = VrPanoramaView.TAG;
                int var1 = this.inputType;
                Log.e(var10000, (new StringBuilder(38)).append("Invalid Options.inputType: ").append(var1).toString());
                this.inputType = 1;
            }
        }
}

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