android4.4 添加关机音乐关机动画

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4.4的开关机动画的服务为bootanimation （全志allwinner平台下）

init.rc里面有下面一行，开机时候会调用此服务 service bootanim /system/bin/bootanimation。surfaceflinger里面用过ctrl_start 调用服务，详细可以搜索代码。

虽然bootanim名称为开机动画，但代码里面其实包含了关机动画和关机音乐相关的内容。

51 property_get("sys.shutdown_animation", cmd, "boot");
52 const char* url = "/system/media/boot.wav";
53 if (!strcmp(cmd, "shutdown")) {
54 url = "/system/media/shutdown.wav";
55 }

sys.shutdown_animation 属性值为shutdown时，播放shuudown.wav

关机音乐在哪里启动bootanimation 并设置属性文件sys.shutdown_animation 为shutdown呢？

./frameworks/base/services/java/com/android/server/power/ShutdownThread.java中的beginShutdownSequence(Context context) 函数中

373 // throw up an indeterminate system dialog to indicate radio is
374 // shutting down.
375 final ProgressDialog pd = new ProgressDialog(context);
376 pd.setTitle(context.getText(com.android.internal.R.string.power_off));
377 pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));
378 pd.setIndeterminate(true);
379 pd.setCancelable(false);
380 pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
381
382 int shutdownduration = SystemProperties.getInt("persist.sys.shutdownduration", 0);
383 if (shutdownduration <= 0) pd.show();

persist.sys.shutdownduration需要设置成>0，设置成1.

如下代码会设置sys.shutdown_animation为shutdown，并开启bootanim服务。

446 public void run() {
447 BroadcastReceiver br = new BroadcastReceiver() {
448 @Override public void onReceive(Context context, Intent intent) {
449 // We don't allow apps to cancel this, so ignore the result.
450 actionDone();
451 }
452 };
453 int shutdownduration = SystemProperties.getInt("persist.sys.shutdownduration", 0);
454 if(!mBootFastEnable){
455 int value = Settings.System.getIntForUser(mContext.getContentResolver(), Settings.System.ACCELER OMETER_ROTATION, 0, UserHandle.USER_CURRENT);
456 int rotation = Surface.ROTATION_0;
457 long startTime = 0;
458 if (shutdownduration > 0) {
459 IWindowManager mWindowManager = IWindowManager.Stub.asInterface(ServiceManager.getService("w indow"));
460 if (mWindowManager != null) {
461 try{
462 rotation = mWindowManager.getRotation();
463 mWindowManager.freezeRotation(Surface.ROTATION_0);
464 mWindowManager.updateRotation(true, true);
465 } catch (RemoteException e) {
466 e.printStackTrace();
467 }
468 }
469 if (rotation != Surface.ROTATION_0) {

470 SystemClock.sleep(600);
471 } else {
472 SystemClock.sleep(200);
473 }
474 startTime = SystemClock.uptimeMillis();
475 SystemProperties.set("sys.shutdown_animation", "shutdown"); //设置sys.shutdown_animation值为shutdown，在bootanim服务中会用到次书属性判断是开机还是关机
476 SystemProperties.set("service.bootanim.exit", "0");
477 SystemProperties.set("ctl.start", "bootanim");
478 }

。。。。。。。。。。。。。。。。。

577 if (shutdownduration > 0) {
578 long sleepTime = SystemClock.uptimeMillis() - startTime; //保证anim运行时间shutdownduration，sleep 确保anim运行完。
579 sleepTime = shutdownduration - sleepTime;
580 if (sleepTime > 0)
581 SystemClock.sleep(sleepTime);
582 if (value == 0) {
583 Settings.System.putInt(mContext.getContentResolver(), Settings.System.USER_ROTATION, rot ation);
584 }
585 Settings.System.putIntForUser(mContext.getContentResolver(), Settings.System.ACCELEROMETER_R OTATION, value, UserHandle.USER_CURRENT);
586 }
587 rebootOrShutdown(mReboot, mRebootReason);

总结：

设置persist.sys.shutdownduration属性的值即可调用关机动画和音乐，属性值对应ms，为anim运行的时间。比如播放音乐的时间，播放动画的时间。

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