Android 关机流程解析_安卓 shutdownreceiver 关机代码

作者：寸_铁 | 2024-08-08 00:29:22

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安卓 shutdownreceiver 关机代码

第一章引言
第二章关机流程
2.1   PhonewindowManager
2.2   PhoneWindowManager.interceptKeyBeforeQueueing
2.3   PhoneWindowManager.interceptPowerKeyDown
2.4   PhoneWindowManager.powerLongPress()
2.5   PowerAction.onPress()
2.6   WindowManagerService.shutdown
2.7   ShutdownThread.shutdown()
2.8   ShutdownThread.shutdownInner()
2.9   ShutdownThread.beginShutdownSequence()
2.10   ShutdowmThread.run()
2.11   ShutdownThread.rebootOrShutdown()

第一章引言
在开始分析关机流程之前，我们先总结几个关机的关键字，以便我们加深我们对关机流程的理解，关键字如下：
InputReader，ShutdownThread，LIGHTS
Line 5981: 05-28 15:24:36.220 838 996 D InputReader: processEventsLocked: type=3 Count=3 code=57 value=-1 deviceId=6 //通常我们以最后一个InputReader输出作为关机的起始时间；
Line 5992: 05-28 15:24:36.248 838 838 D ShutdownThread: Attempting to use SysUI shutdown UI //我们可以通过ShutdownThread的log打印确定这段时间内是否有异常；
Line 5993: 05-28 15:24:36.248 838 838 D ShutdownThread: SysUI handling shutdown UI
Line 6000: 05-28 15:24:36.256 838 5800 I ShutdownThread: Sending shutdown broadcast...
Line 6126: 05-28 15:24:36.605 838 5800 I ShutdownThread: Shutting down activity manager...
Line 7120: 05-28 15:24:38.212 838 5800 I ShutdownThread: Shutting down package manager...
Line 7138: 05-28 15:24:38.249 838 5866 I ShutdownThread: Waiting for Radio...
Line 7139: 05-28 15:24:38.249 838 5866 I ShutdownThread: Radio shutdown complete.
Line 7361: 05-28 15:24:38.759 838 5800 I ShutdownThread: Performing low-level shutdown...
Line 7458: 05-28 15:24:39.027 434 434 D LIGHTS : file:vendor/sprd/modules/lights/lights.c, func:write_int, path=/sys/class/backlight/sprd_backlight/brightness, value=0 //最后一句lights的打印此时屏幕灭屏，我们通常观察的关机结束以此为准；
第二章关机流程
2.1 PhonewindowManager
Android 系统的关机流程是从用户按 power 键开始的，所有的按键处理都是通过 PhoneWindowManager.interceptKeyBeforeQueueing() 方法进行处理。
2.2 PhoneWindowManager.interceptKeyBeforeQueueing
257 public class PhoneWindowManager extends AbsPhoneWindowManager implements WindowManagerPolicy {
3817 public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
…….
// Handle special keys.
3909 switch (keyCode) {
......
case KeyEvent.KEYCODE_POWER: {
4029 EventLogTags.writeInterceptPower(
4030 KeyEvent.actionToString(event.getAction()),
4031 mPowerKeyHandled ? 1 : 0, mPowerKeyPressCounter);
4032 // Any activity on the power button stops the accessibility shortcut
4033 cancelPendingAccessibilityShortcutAction();
4034 result &= ~ACTION_PASS_TO_USER;
4035 isWakeKey = false; // wake-up will be handled separately
4036 if (down) {
4037 /*SPRD : add power debug log start*/
4038 Slog.d(TAG, "Receive Input KeyEvent of Powerkey down");
4039 /*SPRD : add power debug log end*/
4040 interceptPowerKeyDown(event, interactive);
4041 } else {
4042 /*SPRD : add power debug log start*/
4043 Slog.d(TAG, "Receive Input KeyEvent of Powerkey up");
4044 /*SPRD : add power debug log end*/
4045 interceptPowerKeyUp(event, interactive, canceled);
4046 }
4047 break;
4048 }

2.3 PhoneWindowManager.interceptPowerKeyDown
946 private void interceptPowerKeyDown(KeyEvent event, boolean interactive) {
......
// Latch power key state to detect screenshot chord.
960 if (interactive && !mScreenshotChordPowerKeyTriggered
961 && (event.getFlags() & KeyEvent.FLAG_FALLBACK) == 0) {
962 mScreenshotChordPowerKeyTriggered = true;
963 mScreenshotChordPowerKeyTime = event.getDownTime();
964 interceptScreenshotChord();
965 interceptRingerToggleChord();
966 }
967
968 // Stop ringing or end call if configured to do so when power is pressed.
969 TelecomManager telecomManager = getTelecommService();
970 boolean hungUp = false;
971 if (telecomManager != null) {
972 if (telecomManager.isRinging()) {
973 // Pressing Power while there's a ringing incoming
974 // call should silence the ringer.
975 telecomManager.silenceRinger();
976 } else if ((mIncallPowerBehavior
977 & Settings.Secure.INCALL_POWER_BUTTON_BEHAVIOR_HANGUP) != 0
978 && telecomManager.isInCall() && interactive) {
979 // Otherwise, if "Power button ends call" is enabled,
980 // the Power button will hang up any current active call.
981 hungUp = telecomManager.endCall();
982 }
983 }
……
mPowerKeyHandled = hungUp || mScreenshotChordVolumeDownKeyTriggered
1004 || mA11yShortcutChordVolumeUpKeyTriggered || gesturedServiceIntercepted;
1005 if (!mPowerKeyHandled) {
1006 if (interactive) {
1007 // When interactive, we're already awake.
1008 // Wait for a long press or for the button to be released to decide what to do.
1009 if (hasLongPressOnPowerBehavior()) {
1010 if ((event.getFlags() & KeyEvent.FLAG_LONG_PRESS) != 0) {
1011 powerLongPress();//长按power键，核心
1012 } else {
……
} else {
1026 wakeUpFromPowerKey(event.getDownTime());
1027
1028 if (mSupportLongPressPowerWhenNonInteractive && hasLongPressOnPowerBehavior()) {
1029 if ((event.getFlags() & KeyEvent.FLAG_LONG_PRESS) != 0) {
1030 powerLongPress();//长按power键，核心
1031 } else {
……
mBeganFromNonInteractive = true;
1045 } else {
……

1052 }
1053 }
1054 }
1055 }
1056 }

2.4   PhoneWindowManager.powerLongPress()
3   private void powerLongPress() {
4   1267 final int behavior = getResolvedLongPressOnPowerBehavior();
5   1268 switch (behavior) {
6   1269 case LONG_PRESS_POWER_NOTHING:
7   1270 break;
8   1271 case LONG_PRESS_POWER_GLOBAL_ACTIONS://原生会走这个case
9   1272 mPowerKeyHandled = true;
10   1273 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS, false,
11   1274 "Power - Long Press - Global Actions");
12   1275 showGlobalActionsInternal();//调用showlobalactioninternal
13   1276 break;
powerLongPress() 有两个核心方法，getResolvedLongPressOnPowerBehavior() 和 showGlobalActionsInternal()，在此不再做分解分析。
2.5   PowerAction.onPress()
25 public final class PowerAction extends SinglePressAction implements LongPressAction {
@Override
57 public void onPress() {
58 // shutdown by making sure radio and power are handled accordingly.
59 mWindowManagerFuncs.shutdown(false /* confirm */);
60 }
61 }
2.6   WindowManagerService.shutdown
public class WindowManagerService extends AbsWindowManagerService
290 implements Watchdog.Monitor, WindowManagerPolicy.WindowManagerFuncs {
……
// Called by window manager policy. Not exposed externally.
public void shutdown(boolean confirm) {
3174 // Pass in the UI context, since ShutdownThread requires it (to show UI).
//调用shutdownThread.shutdown()方法
3175 ShutdownThread.shutdown(ActivityThread.currentActivityThread().getSystemUiContext(),
3176 PowerManager.SHUTDOWN_USER_REQUESTED, confirm);
3177 }
2.7   ShutdownThread.shutdown()
就像在第一章引言所述，整体的关机流程是通过shutdownThread线程实现。
62 public final class ShutdownThread extends Thread {
public static void shutdown(final Context context, String reason, boolean confirm) {
153 mReboot = false;
154 mRebootSafeMode = false;
155 mReason = reason;
156 shutdownInner(context, confirm);//内部调用shytdownInner()方法
157 }

2.8   ShutdownThread.shutdownInner()
private static void shutdownInner(final Context context, boolean confirm) {
183 // ShutdownThread is called from many places, so best to verify here that the context passed
184 // in is themed.
185 context.assertRuntimeOverlayThemable();
186
187 // ensure that only one thread is trying to power down.
188 // any additional calls are just returned
189 synchronized (sIsStartedGuard) {
190 if (sIsStarted) {
191 Log.d(TAG, "Request to shutdown already running, returning.");
192 return;
193 }
194 }
195 //获取用户长按power键的处理方式
196 final int longPressBehavior = context.getResources().getInteger(
197 com.android.internal.R.integer.config_longPressOnPowerBehavior);
198 final int resourceId = mRebootSafeMode
199 ? com.android.internal.R.string.reboot_safemode_confirm
200 /*UNISOC bug 908624,add confirm dialog.*/
201 : (mReboot
202 ? com.android.internal.R.string.reboot_device_confirm
203 /*UNISOC bug 908624,add confirm dialog.*/
204 : (longPressBehavior == 2
205 ? com.android.internal.R.string.shutdown_confirm_question
206 : com.android.internal.R.string.shutdown_confirm));
207
208 Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);
……
if (confirm) {//弹出关机，重启对话框，用户选择
215 final CloseDialogReceiver closer = new CloseDialogReceiver(context);//注册关机广播
216 if (sConfirmDialog != null) {
217 sConfirmDialog.dismiss();
218 }
219
220 //bug:1162804 add dark theme.
221 if (sInstance.mUiModeManager == null) {
222 sInstance.mUiModeManager = (UiModeManager) context.getSystemService(Context.UI_MODE_SERVICE);
223 }
224 if (sInstance.mUiModeManager != null && sInstance.mPowerManager != null &&(sInstance.mUiModeManager.getNightMode() == UiModeManager.MODE_NIGHT_YES
225 || sInstance.mPowerManager.isPowerSaveMode())) {
226 sInstance.mThemeResId = AlertDialog.THEME_DEVICE_DEFAULT_DARK;
227 } else {
228 sInstance.mThemeResId = AlertDialog.THEME_DEVICE_DEFAULT_LIGHT;
229 }
230 //创建关机Dialog
231 sConfirmDialog = new AlertDialog.Builder(context, sInstance.mThemeResId)
232 .setTitle(mRebootSafeMode
233 ? com.android.internal.R.string.reboot_safemode_title
234 /*UNISOC bug 908624*/
235 :(mReboot
236 ? com.android.internal.R.string.reboot_device_title
237 /*UNISOC bug 908624*/
238 : com.android.internal.R.string.power_off))
239 .setMessage(resourceId)
240 .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
241 public void onClick(DialogInterface dialog, int which) {
242 beginShutdownSequence(context);//执行shutdownsequence方法，开始关机的流程
243 }
244 })
245 .setNegativeButton(com.android.internal.R.string.no, null)
246 .create();
247 closer.dialog = sConfirmDialog;
248 sConfirmDialog.setOnDismissListener(closer);
249 sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
250 sConfirmDialog.show();
251 } else {
252 beginShutdownSequence(context);
253 }
254 }
2.9   ShutdownThread.beginShutdownSequence()
我们一般可以在这个方法里添加关机动画，在这里加入的sprd的关机动画
private static void beginShutdownSequence(Context context) {
420 synchronized (sIsStartedGuard) {
421 if (sIsStarted) {
422 Log.d(TAG, "Shutdown sequence already running, returning.");
423 return;
424 }
425 sIsStarted = true;
426 }
427
428 // SPRD:add for shutdownanim
429 if (shutdownAnim.hasShutdownAnimation() &&
430 !(mReason != null && mReason.startsWith(PowerManager.REBOOT_RECOVERY_UPDATE))) {
431 shutdownAnim.playShutdownAnimation();
432 } else {
433 sInstance.mProgressDialog = showShutdownDialog(context);
434 }
435 sInstance.mContext = context;
436
437 // make sure we never fall asleep again
438 sInstance.mCpuWakeLock = null;
439 try {
440 sInstance.mCpuWakeLock = sInstance.mPowerManager.newWakeLock(
441 PowerManager.PARTIAL_WAKE_LOCK, TAG + "-cpu");
442 sInstance.mCpuWakeLock.setReferenceCounted(false);
443 sInstance.mCpuWakeLock.acquire();
444 } catch (SecurityException e) {
445 Log.w(TAG, "No permission to acquire wake lock", e);
446 sInstance.mCpuWakeLock = null;
447 }
……
} else {
//启动关机线程，执行Run()方法
475 sInstance.mHandler = new Handler() {
476 };
477 sInstance.start();
478 }
479 }
480

2.10 ShutdowmThread.run()
492 public void run() {
……
{
511 String reason = (mReboot ? "1" : "0") + (mReason != null ? mReason : "");
512 SystemProperties.set(SHUTDOWN_ACTION_PROPERTY, reason);
//保存关机的原因
513 }
514
515 /*
516 * If we are rebooting into safe mode, write a system property
517 * indicating so.
518 */
519 if (mRebootSafeMode) {
520 SystemProperties.set(REBOOT_SAFEMODE_PROPERTY, "1");
521 }
522
523 metricStarted(METRIC_SEND_BROADCAST);
524 shutdownTimingLog.traceBegin("SendShutdownBroadcast");
525 Log.i(TAG, "Sending shutdown broadcast...");
526
527 // First send the high-level shut down broadcast.
528 mActionDone = false;
529 Intent intent = new Intent(Intent.ACTION_SHUTDOWN);
530 intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND | Intent.FLAG_RECEIVER_REGISTERED_ONLY);
//发送关机广播
531 mContext.sendOrderedBroadcastAsUser(intent,
532 UserHandle.ALL, null, br, mHandler, 0, null, null);
533
534 final long endTime = SystemClock.elapsedRealtime() + MAX_BROADCAST_TIME;
535 synchronized (mActionDoneSync) {
536 while (!mActionDone) {
537 long delay = endTime - SystemClock.elapsedRealtime();
538 if (delay <= 0) {
539 Log.w(TAG, "Shutdown broadcast timed out");
540 break;
541 } else if (mRebootHasProgressBar) {
542 int status = (int)((MAX_BROADCAST_TIME - delay) * 1.0 *
543 BROADCAST_STOP_PERCENT / MAX_BROADCAST_TIME);
544 sInstance.setRebootProgress(status, null);
545 }
546 try {
547 mActionDoneSync.wait(Math.min(delay, ACTION_DONE_POLL_WAIT_MS));
548 } catch (InterruptedException e) {
549 }
550 }
551 }
552 if (mRebootHasProgressBar) {
553 sInstance.setRebootProgress(BROADCAST_STOP_PERCENT, null);
554 }
555 shutdownTimingLog.traceEnd(); // SendShutdownBroadcast
//sendshutsownbroadcast 关机广播耗时
556 metricEnded(METRIC_SEND_BROADCAST);
557
558 Log.i(TAG, "Shutting down activity manager...");
559 shutdownTimingLog.traceBegin("ShutdownActivityManager");
560 metricStarted(METRIC_AM);
561
562 final IActivityManager am =
563 IActivityManager.Stub.asInterface(ServiceManager.checkService("activity"));
564 if (am != null) {
565 try {
566 am.shutdown(MAX_BROADCAST_TIME);//关闭activitymanagerservice服务
567 } catch (RemoteException e) {
568 }
569 }
570 if (mRebootHasProgressBar) {
571 sInstance.setRebootProgress(ACTIVITY_MANAGER_STOP_PERCENT, null);
572 }
573 shutdownTimingLog.traceEnd();// ShutdownActivityManager
574 metricEnded(METRIC_AM);
575
576 Log.i(TAG, "Shutting down package manager...");
577 shutdownTimingLog.traceBegin("ShutdownPackageManager");
578 metricStarted(METRIC_PM);
579
580 final PackageManagerService pm = (PackageManagerService)
581 ServiceManager.getService("package");
582 if (pm != null) {
583 pm.shutdown();//关闭packageManagerService服务
584 }
585 if (mRebootHasProgressBar) {
586 sInstance.setRebootProgress(PACKAGE_MANAGER_STOP_PERCENT, null);
587 }
588 shutdownTimingLog.traceEnd(); // ShutdownPackageManager
589 metricEnded(METRIC_PM);
590
591 // Shutdown radios.
592 shutdownTimingLog.traceBegin("ShutdownRadios");
593 metricStarted(METRIC_RADIOS);
594 shutdownRadios(MAX_RADIO_WAIT_TIME);
595 if (mRebootHasProgressBar) {
596 sInstance.setRebootProgress(RADIO_STOP_PERCENT, null);
597 }
598 shutdownTimingLog.traceEnd(); // ShutdownRadios
599 metricEnded(METRIC_RADIOS);
600
601 if (mRebootHasProgressBar) {
602 sInstance.setRebootProgress(MOUNT_SERVICE_STOP_PERCENT, null);
603
604 // If it's to reboot to install an update and uncrypt hasn't been
605 // done yet, trigger it now.
606 uncrypt();
607 }
608
609 shutdownTimingLog.traceEnd(); // SystemServerShutdown
610 metricEnded(METRIC_SYSTEM_SERVER);
611 saveMetrics(mReboot, mReason);
612 // SPRD:add for shutdownanim
613 shutdownAnim.waitForBootanim();
614 // Remaining work will be done by init, including vold shutdown
615 rebootOrShutdown(mContext, mReboot, mReason);//执行rebootOrShutdown方法()
616 }

2.11 ShutdownThread.rebootOrShutdown()
当前方法决定是关机还是重启
public static void rebootOrShutdown(final Context context, boolean reboot, String reason) {
739 if (reboot) {//判断是否重启
740 Log.i(TAG, "Rebooting, reason: " + reason);
741 PowerManagerService.lowLevelReboot(reason);
742 Log.e(TAG, "Reboot failed, will attempt shutdown instead");
743 reason = null;
744 } else if (SHUTDOWN_VIBRATE_MS > 0 && context != null) {
745 // vibrate before shutting down
746 Vibrator vibrator = new SystemVibrator(context);
747 try {
//关机之前震动
748 vibrator.vibrate(SHUTDOWN_VIBRATE_MS, VIBRATION_ATTRIBUTES);
749 } catch (Exception e) {
750 // Failure to vibrate shouldn't interrupt shutdown. Just log it.
751 Log.w(TAG, "Failed to vibrate during shutdown.", e);
752 }
753
754 // vibrator is asynchronous so we need to wait to avoid shutting down too soon.
755 try {
756 Thread.sleep(SHUTDOWN_VIBRATE_MS);
757 } catch (InterruptedException unused) {
758 }
759 }
760 // Shutdown power
761 Log.i(TAG, "Performing low-level shutdown...");
//调用lowLevelSgutdwon方法，shutdown power
762 PowerManagerService.lowLevelShutdown(reason);
763 }

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