问题发现

描述

在 8295 上多次启动车辆中心或地图等使用 SurfaceView 的应用，再退后台，SurfaceFlinger 中的相关 layer 无法回收。在 8155 无此问题。

复现

多次执行如下命令。

adb shell am start-activity -n com.lixiang.car.carcenter/.MainActivity
adb shell input keyevent HOME

执行如下命令查看 layer 状态。

adb shell dumpsys SurfaceFlinger

Offscreen Layers 中可查看 SurfaceView layer 没有销毁。

Offscreen Layers:
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity]#0 (ContainerLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer Background for SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity]#0 (EffectLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity](BLAST)#0 (BufferStateLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity](BLAST)#0 (BufferStateLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity]#0 (ContainerLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity]#0 (ContainerLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity](BLAST)#0 (BufferStateLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity]#0 (ContainerLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer SurfaceView[com.lixiang.car.carcenter/com.lixiang.car.carcenter.MainActivity](BLAST)#0 (BufferStateLayer) callingPid:29810 callingUid:10019 ownerUid:10019
Layer Surface(name=dd5f07 InputMethod)/@0xa40465d - animation-leash of insets_animation#0 (EffectLayer) callingPid:1207 callingUid:1000 ownerUid:1000

Demo 复现

我们使用 Demo 应用尝试复现问题，代码如下。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    WindowManager.LayoutParams params = new WindowManager.LayoutParams();
    params.width = WindowManager.LayoutParams.WRAP_CONTENT;
    params.height = WindowManager.LayoutParams.WRAP_CONTENT;
    addContentView(new SurfaceView(this), params);
}

复现

执行一次如下命令后，查看 layer 状态。

adb shell am start-activity -n com.example.noactivity/.MainActivity
adb shell input keyevent HOME
adb shell dumpsys SurfaceFlinger