Android 10 去除android正在启动弹窗

开机以后，设备会有一个android is starting 的弹框，该界面就是FallbackHome。

FallbackHome机制是为了在系统还没有解锁前 先进入Setting中的android正在启动弹窗 的页面等系统完全解锁后 然后进入默认Launcher 但是弹窗也会影响产品效果 所以最后去掉这个弹窗 不显示在桌面壁纸，直接进入Launcher。

1. 延长开机动画 在解锁后直接进去Launcher

   在WindowManagerService.java中，注释掉退出开机动画的逻辑，延时开机动画
   路径:frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
   
   private void performEnableScreen() {
       synchronized (mGlobalLock) {
           if (DEBUG_BOOT) Slog.i(TAG_WM, "performEnableScreen: mDisplayEnabled=" + mDisplayEnabled
                   + " mForceDisplayEnabled=" + mForceDisplayEnabled
                   + " mShowingBootMessages=" + mShowingBootMessages
                   + " mSystemBooted=" + mSystemBooted
                   + " mOnlyCore=" + mOnlyCore,
                   new RuntimeException("here").fillInStackTrace());
           if (mDisplayEnabled) {
               return;
           }
           if (!mSystemBooted && !mShowingBootMessages) {
               return;
           }
   
           if (!mShowingBootMessages && !mPolicy.canDismissBootAnimation()) {
               return;
           }
   
           // Don't enable the screen until all existing windows have been drawn.
           if (!mForceDisplayEnabled
                   // TODO(multidisplay): Expand to all displays?
                   && getDefaultDisplayContentLocked().checkWaitingForWindows()) {
               return;
           }
           //在这里处理播放完开机动画后是否退出开机动画,所以注释掉
           //phoebe add for Extend Animation at ActivityRecord.java onWindowsDrawn start
           /*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()) {
               if (DEBUG_BOOT) Slog.i(TAG_WM, "performEnableScreen: Waiting for anim complete");
               return;
           }
   
           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_FINISHED
                           data, null, 0);
                   data.recycle();
               }
           } catch (RemoteException ex) {
               Slog.e(TAG_WM, "Boot completed: SurfaceFlinger is dead!");
           }*/
           //phoebe add for Extend Animation at ActivityRecord.java onWindowsDrawn end
           
           EventLog.writeEvent(EventLogTags.WM_BOOT_ANIMATION_DONE, SystemClock.uptimeMillis());
           Trace.asyncTraceEnd(TRACE_TAG_WINDOW_MANAGER, "Stop bootanim", 0);
           mDisplayEnabled = true;
           if (DEBUG_SCREEN_ON || DEBUG_BOOT) Slog.i(TAG_WM, "******************** 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);
   }

2. 解锁结束后退出开机动画在ActivityRecord中onWindowsDrawn( 退出动画 开启系统手势触摸功能)

   路径:frameworks/base/services/core/java/com/android/server/wm/ActivityRecord.java
   /** Called when the windows associated app window container are drawn. */
   public void onWindowsDrawn(boolean drawn, long timestamp) {
       synchronized (mAtmService.mGlobalLock) {
           mDrawn = drawn;
           if (!drawn) {
               return;
           }
           final WindowingModeTransitionInfoSnapshot info = mStackSupervisor
                   .getActivityMetricsLogger().notifyWindowsDrawn(getWindowingMode(), timestamp);
           final int windowsDrawnDelayMs = info != null ? info.windowsDrawnDelayMs : INVALID_DELAY;
           final @LaunchState int launchState = info != null ? info.getLaunchState() : -1;
           mStackSupervisor.reportActivityLaunchedLocked(false /* timeout */, this,
                   windowsDrawnDelayMs, launchState);
           mStackSupervisor.stopWaitingForActivityVisible(this);
           finishLaunchTickingLocked();
           if (task != null) {
               task.hasBeenVisible = true;
           }
           //解锁后退出开机动画
           // phoebe add for exit bootanim start
           if (isHomeIntent(intent) && shortComponentName != null && !shortComponentName.contains("FallbackHome")) {
               SystemProperties.set("service.bootanim.exit", "1");
               android.util.Log.e("ActivityRecord", "real home....." + shortComponentName);
   
               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_FINISHED
                               data, null, 0);
                       data.recycle();
                   }
               } catch (RemoteException ex) {
                   Slog.e(TAG, "Boot completed: SurfaceFlinger is dead!");
               }
           }
           // phoebe add for exit bootanim end
   
           //modify for performance begin
           Bundle b = new Bundle();
           b.putLong(ProcessInfo.KEY_LAUNCH_TIME, (long)windowsDrawnDelayMs);
           b.putBoolean(ProcessInfo.KEY_FULLSCREEN, (task != null && task.mFullscreen));
           mAtmService.notifyActivityStateChange(this.intent, ProcessInfo.ACTIVITY_STATE_LAUNCHDONE, b);
           //modify for performance end
       }
   }

3. 去掉Settings 的Android 正在启动… 弹窗

   //packages\apps\Settings\src\com\android\settings\FallbackHome.java
       private final Runnable mProgressTimeoutRunnable = () -> {
           //phoebe add for remove android is starting tips
   //        View v = getLayoutInflater().inflate(
   //                R.layout.fallback_home_finishing_boot, null /* root */);
   //        setContentView(v);
   //        v.setAlpha(0f);
   //        v.animate()
   //                .alpha(1f)
   //                .setDuration(500)
   //                .setInterpolator(AnimationUtils.loadInterpolator(
   //                        this, android.R.interpolator.fast_out_slow_in))
   //                .start();
           getWindow().addFlags(LayoutParams.FLAG_KEEP_SCREEN_ON);
       };

   每日语录：加油！！！

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