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开机以后#xff0c;设备会有一个“android正在启动”这样的弹框#xff0c;这个界面是一个叫FallbackHome的Activity来展示的。FallbackHome机制是Android系统启动过程中的一种降级处理机制。当系统启动时#xff0c;如果默认的Launcher应用无法正常加载或出现…1 原理说明
开机以后设备会有一个“android正在启动”这样的弹框这个界面是一个叫FallbackHome的Activity来展示的。FallbackHome机制是Android系统启动过程中的一种降级处理机制。当系统启动时如果默认的Launcher应用无法正常加载或出现错误系统会自动启用FallbackHome来替代默认Launcher。但一般为了改善产品体验最终决定移除弹窗页面直接进入默认的Launcher避免弹窗对用户界面的干扰。具体而言FallbackHome机制包括以下内容
默认Launcher故障检测系统会检测默认的Launcher应用是否能够正常加载和运行。如果检测到故障系统将启动FallbackHome。解锁过程中的弹窗在系统解锁之前可能会出现一个Android正在启动的弹窗页面用于指示系统正在加载和准备。这个弹窗页面通常出现在桌面壁纸上用户需要等待系统完全解锁后才能进入默认的Launcher。
去掉FallbackHome的效果实际上是让FallbackHome的view不显示然后开机启动动画延长一下直到系统解锁后再停止开机动画完成这样较为顺滑的过渡。
2 修改方案Android Q R S
如果只是需要将FallbackHome去掉黑屏但是不做任何处理实测时间较短则只需要改1即可。如果不是前面这种情况那么就需要修改2和3了。具体修改方案如下这里以S版本修改为主Q和R有一些差异但原理不变
1 修改文件为AOSP/packages/apps/Settings$ vim src/com/android/settings/FallbackHome.java目的为FallbackHome不显示View所以注释掉。修改内容为
public class FallbackHome extends Activity {private static final String TAG FallbackHome;private static final int PROGRESS_TIMEOUT 2000;private boolean mProvisioned;private WallpaperManager mWallManager;private final Runnable mProgressTimeoutRunnable () - {//AGS add start//不显示任何内容如果是黑色衔接直接改这里就足够了如果不是则需要 23步骤内容的修改/* View v getLayoutInflater().inflate(R.layout.fallback_home_finishing_boot, null);setContentView(v);v.setAlpha(0f);v.animate().alpha(1f).setDuration(500).setInterpolator(AnimationUtils.loadInterpolator(this, android.R.interpolator.fast_out_slow_in)).start();*///AGS add endgetWindow().addFlags(LayoutParams.FLAG_KEEP_SCREEN_ON);};//...
}
2 修改文件为AOSP/frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java目的为播放完开机动画后不退出开机动画所以注释掉即可。修改内容为
public class WindowManagerService extends IWindowManager.Stubimplements Watchdog.Monitor, WindowManagerPolicy.WindowManagerFuncs {//...private void performEnableScreen() {synchronized (mGlobalLock) {ProtoLog.i(WM_DEBUG_BOOT, performEnableScreen: mDisplayEnabled%b mForceDisplayEnabled%b mShowingBootMessages%b mSystemBooted%b mOnlyCore%b. %s, mDisplayEnabled,mForceDisplayEnabled, mShowingBootMessages, mSystemBooted, mOnlyCore,new RuntimeException(here).fillInStackTrace());if (mDisplayEnabled) {return;}if (!mSystemBooted !mShowingBootMessages) {return;}if (!mShowingBootMessages !mPolicy.canDismissBootAnimation()) {return;}// Dont enable the screen until all existing windows have been drawn.if (!mForceDisplayEnabled) {if (mBootWaitForWindowsStartTime 0) {// First time we will start waiting for all windows to be drawn.mBootWaitForWindowsStartTime SystemClock.elapsedRealtime();}for (int i mRoot.getChildCount() - 1; i 0; i--) {if (mRoot.getChildAt(i).shouldWaitForSystemDecorWindowsOnBoot()) {return;}}long waitTime SystemClock.elapsedRealtime() - mBootWaitForWindowsStartTime;mBootWaitForWindowsStartTime -1;if (waitTime 10) {ProtoLog.i(WM_DEBUG_BOOT,performEnableScreen: Waited %dms for all windows to be drawn,waitTime);}}//AGS add start//播放完开机动画后不退出开机动画,注释掉如下代码即可。/*if (!mBootAnimationStopped) {Trace.asyncTraceBegin(TRACE_TAG_WINDOW_MANAGER, Stop bootanim, 0);// stop boot animation// formerly we would just kill the process, but we now ask it to exit so it// can choose where to stop the animation.SystemProperties.set(service.bootanim.exit, 1);mBootAnimationStopped true;}if (!mForceDisplayEnabled !checkBootAnimationCompleteLocked()) {ProtoLog.i(WM_DEBUG_BOOT, performEnableScreen: Waiting for anim complete);return;}try {IBinder surfaceFlinger ServiceManager.getService(SurfaceFlinger);if (surfaceFlinger ! null) {ProtoLog.i(WM_ERROR, ******* TELLING SURFACE FLINGER WE ARE BOOTED!);Parcel data Parcel.obtain();data.writeInterfaceToken(android.ui.ISurfaceComposer);surfaceFlinger.transact(IBinder.FIRST_CALL_TRANSACTION, // BOOT_FINISHEDdata, null, 0);data.recycle();}} catch (RemoteException ex) {ProtoLog.e(WM_ERROR, Boot completed: SurfaceFlinger is dead!);}*///AGS add endEventLogTags.writeWmBootAnimationDone(SystemClock.uptimeMillis());Trace.asyncTraceEnd(TRACE_TAG_WINDOW_MANAGER, Stop bootanim, 0);mDisplayEnabled true;ProtoLog.i(WM_DEBUG_SCREEN_ON, ******************** ENABLING SCREEN!);// Enable input dispatch.mInputManagerCallback.setEventDispatchingLw(mEventDispatchingEnabled);}try {mActivityManager.bootAnimationComplete();} catch (RemoteException e) {}mPolicy.enableScreenAfterBoot();// Make sure the last requested orientation has been applied.updateRotationUnchecked(false, false);}//...
}
3 修改文件为AOSP/frameworks/base/services/core/java/com/android/server/wm/ActivityRecord.java目的为解锁后再结束开机动画。修改内容为
public final class ActivityRecord extends WindowToken implements WindowManagerService.AppFreezeListener {
/** Called when the windows associated app window container are drawn. *///...private void onWindowsDrawn(long timestampNs) {if (mPerf ! null perfActivityBoostHandler 0) {mPerf.perfLockReleaseHandler(perfActivityBoostHandler);perfActivityBoostHandler -1;} else if (perfActivityBoostHandler 0) {Slog.w(TAG, activity boost didnt release as expected);}final TransitionInfoSnapshot info mTaskSupervisor.getActivityMetricsLogger().notifyWindowsDrawn(this, timestampNs);final boolean validInfo info ! null;final int windowsDrawnDelayMs validInfo ? info.windowsDrawnDelayMs : INVALID_DELAY;final WaitResult.LaunchState int launchState validInfo ? info.getLaunchState() : WaitResult.LAUNCH_STATE_UNKNOWN;// The activity may have been requested to be invisible (another activity has been launched)// so there is no valid info. But if it is the current top activity (e.g. sleeping), the// invalid state is still reported to make sure the waiting result is notified.if (validInfo || this getDisplayArea().topRunningActivity()) {mTaskSupervisor.reportActivityLaunched(false /* timeout */, this,windowsDrawnDelayMs, launchState);}finishLaunchTickingLocked();if (task ! null) {task.setHasBeenVisible(true);}//AGS add start/*if (isHomeIntent(intent) shortComponentName ! null !shortComponentName.contains(FallbackHome)) {SystemProperties.set(service.bootanim.exit, 1);//这里就是将上面注掉的代码copy过来try {IBinder surfaceFlinger ServiceManager.getService(SurfaceFlinger);if (surfaceFlinger ! null) {Slog.i(TAG_WM, ******* TELLING SURFACE FLINGER WE ARE BOOTED!);Parcel data Parcel.obtain();data.writeInterfaceToken(android.ui.ISurfaceComposer);surfaceFlinger.transact(IBinder.FIRST_CALL_TRANSACTION, // BOOT_FINISHEDdata, null, 0);data.recycle();}} catch (RemoteException ex) {Slog.e(TAG, Boot completed: SurfaceFlinger is dead!);}}*///AGS add endmLaunchRootTask null;}//...
}
