Android-L问题：使用FLAG_ACTIVITY_REORDER_TO_FRONT启动上一个活动并冻结应用一段时间后，onBackpressed

Question

我的应用程序有异常行为

我通过在Nexus 7或Moto G等Android L OS设备上执行以下步骤来证明了此问题。

1. 该应用程序从活动A开始，该活动仅显示一个名为“启动B”的按钮。
2. 按下此按钮-执行startActivity（FLAG_ACTIVITY_REORDER_TO_FRONT，ActivityB.class） 。
3. 活动B变为活动状态，它在UI线程上执行一些UI和反手加载操作。
4. 从活动B按下后，在活动B的OnBackPressed中，这将执行startActivity（FLAG_ACTIVITY_REORDER_TO_FRONT，ActivityA.class）。
5. 活动A的onResume（）如预期那样被调用，一切看起来都很好（我可以再次看到活动A的内容）。
6. 按设备的“后退”键，App冻结约10秒钟或更长时间，然后退出应用程序。 无需调用onPause（），onDestroy（）。 （因此某些日志可能不正确）
7. 有时或可能重复上述步骤4-5次，也很不幸迫使googlequicksearchbox关闭

查看系统日志后：找到一些重要的日志：

E/ActivityManager(  958): Reason: Input dispatching timed out (Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.)

重要日志：看看

D/SFPerfTracer(  278):        layers: (2:12) (FocusedStackFrame (0xb8fa6b48): 0:637)* (DimLayer (0xb8fa95c0): 0:14)* (DimLayer (0xb8fe63b0): 0:510)* (DimLayer (0xb8fb7228): 0:213)* (StatusBar (0xb8fd10c0): 0:5421)* (com.android.systemui.ImageWallpaper (0xb8fd6a28): 0:454)* (NavigationBar (0xb8fbaa18): 8:744) (com.android.systemui/com.android.systemui.recents.RecentsActivity (0xb8fbbca8): 0:86)- (com.abc.myapp/com.mypackage.abc.MainActivity (0xb8fd3560): 0:25)- (thumbnail anim (0xb8ff72b0): 0:12)- (com.abc.myapp/com.mypackage.abc_etv.EtvLaunchActivity (0xb8ffb570): 14:34) 

I/LaunchCheckinHandler(  958): Displayed com.abc.myapp/com.mypackage.abc.MainActivity,wp,wa,286

I/WindowManager(  958): Input event dispatching timed out sending to application AppWindowToken{23d5f06c token=Token{299ea51f ActivityRecord{2f0940be u0 com.google.android.googlequicksearchbox/com.google.android.launcher.GEL t4}}}.  Reason: Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.

I/WindowManager(  958): Input event dispatching timed out sending to application AppWindowToken{23d5f06c token=Token{299ea51f ActivityRecord{2f0940be u0 com.google.android.googlequicksearchbox/com.google.android.launcher.GEL t4}}}.  Reason: Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.

E/ActivityManager(  958): ANR in com.google.android.googlequicksearchbox (com.google.android.googlequicksearchbox/com.google.android.launcher.GEL)

E/ActivityManager(  958): PID: 655

E/ActivityManager(  958): Reason: Input dispatching timed out (Waiting because no window has focus but there is a focused application that may eventually add a window when it finishes starting up.)