Framework Customization Series (6) -----Shield the pop-up window in the FallbackHome mobile phone startup and directly enter the Launcher

1. Shield FallbackHome startup pop-up window

Problem scenario: After removing the lock screen KeyGuard service in the Android system customization, before the system starts up and enters the Launcher, there will be a window popping up while the phone is starting. This part mainly involves FallbackHome in Settings. The solution is as follows:

2. Extended boot animation

Code path: framework/services/core/java/com/android/server/wm/WindowManagerService.java

//注释掉关闭开机动画这段代码
 /* 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 &