介绍

近期在Android 13 上发现当打开自动旋转屏幕后关机，重新启动后自动旋转屏幕关闭了

修改

路径：vendor/mediatek/proprietary/frameworks/base/settingsprovider/java/com/mediatek/provider/MtkSettingsExt.java

        public static final String ACCELEROMETER_ROTATION_RESTORE= "accelerometer_rotation_restore";

实际上这里我们排查时发现 settings list system 

accelerometer_rotation_restore      //这个值通过代码找到发现是在关机动画的patch中后加入的问题就出在这里。

accelerometer_rotation   //自动旋转开关的值

路径：vendor/mediatek/proprietary/frameworks/base/services/core/java/com/mediatek/server/MtkShutdownThread.java

    private boolean showShutdownAnimation(Context context) {beginAnimationTime = 0;if (isCustBootAnim() == ANIMATION_MODE) {configShutdownAnimation(context);// Show Shutdown AnimationbootanimCust(context);return true;}return false;}private static void bootanimCust(Context context) {boolean isRotaionEnabled = false;// [MTK] fix shutdown animation timing issueSystemProperties.set("service.shutanim.running", "0");Log.i(TAG, "set service.shutanim.running to 0");try {isRotaionEnabled = Settings.System.getInt(context.getContentResolver(),Settings.System.ACCELEROMETER_ROTATION, 1) != 0;//这里是在关机时如果自动旋转开启，则先关闭自动旋转在执行关机动画，其中还记录了一个ACCELEROMETER_ROTATION_RESTORE的值但是没有其他地方调用if (isRotaionEnabled) {final IWindowManager wm = IWindowManager.Stub.asInterface(ServiceManager.getService(Context.WINDOW_SERVICE));if (wm != null) {wm.freezeRotation(Surface.ROTATION_0);}Settings.System.putInt(context.getContentResolver(),Settings.System.ACCELEROMETER_ROTATION, 0);Settings.System.putInt(context.getContentResolver(),MtkSettingsExt.System.ACCELEROMETER_ROTATION_RESTORE, 1);//既然没有用到这个值，我们就用这个值来判断什么时候保存自动旋转的状态，当自动旋转关闭时我们put 0//*/soda water.20231228 Automatic rotation save}else{Settings.System.putInt(context.getContentResolver(),MtkSettingsExt.System.ACCELEROMETER_ROTATION_RESTORE, 0);}//*/} catch (NullPointerException ex) {Log.e(TAG, "check Rotation: context object is null when get Rotation");} catch (RemoteException e) {e.printStackTrace();}beginAnimationTime = SystemClock.elapsedRealtime() + MIN_SHUTDOWN_ANIMATION_PLAY_TIME;//Disable key dispatchtry {final IWindowManager wm = IWindowManager.Stub.asInterface(ServiceManager.getService(Context.WINDOW_SERVICE));if (wm != null) {wm.setEventDispatching(false);}} catch (RemoteException e) {e.printStackTrace();}//Disable key dispatchstartBootAnimation();}

上面我们已经用ACCELEROMETER_ROTATION_RESTORE 记录了自动旋转的值，这里为什么不直接删掉

                Settings.System.putInt(context.getContentResolver(),
                        Settings.System.ACCELEROMETER_ROTATION, 0);

，因为执行关机动画时不希望屏幕可以旋转。

接下来我们执行在开机时finishBooting的中读ACCELEROMETER_ROTATION_RESTORE的值当为1时来putACCELEROMETER_ROTATION的值为1即可。

路径：frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

//*/soda water.20231228 Automatic rotation save
import android.provider.Settings;
//*/public class ActivityManagerService extends IActivityManager.Stubimplements Watchdog.Monitor, BatteryStatsImpl.BatteryCallback, ActivityManagerGlobalLock {//.....略final void finishBooting() {//*/soda water.20231228 Automatic rotation savetry {boolean rotation = Settings.System.getInt(mContext.getContentResolver(),"accelerometer_rotation_restore", 0) == 1;if(rotation){Settings.System.putInt(mContext.getContentResolver(),Settings.System.ACCELEROMETER_ROTATION,1);}} catch (Exception ex) {}//*/}
}