Question

我有一个小部件，通过Intent调用此活动，它的onCreate方法具有以下代码：

WindowManager wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mTopView = (ViewGroup) inflater.inflate(R.layout.screen_filter, null);

WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                PixelFormat.TRANSLUCENT);           

        params.flags = WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                |WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 
                |WindowManager.LayoutParams.FLAG_FULLSCREEN;

        getWindow().setAttributes(params);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        wm.addView(mTopView, params);

该代码会创建一个叠加层，作为屏幕过滤器，保持在每个活动之上。

问题是我不知道如何在以后删除它。

致电wm.removeView(mTopView);会出错

java.lang.IllegalArgumentException：视图未附加到窗口管理器

根据我的理解，我失去了对我添加的视图的引用，因为我使用Intent从一个小部件调用它。它是一个状态机，一个州添加了这个视图，下面的状态应该删除它。

如何删除它？也许某些方法允许我搜索所有添加的视图然后删除它们？

任何暗示都会受到赞赏。

Answer 1

由于您使用窗口管理器显示警报视图，因此您需要保持添加视图的实例。

创建服务以将视图添加到窗口。因此，当服务被销毁时，您可以从窗口中删除视图。

以下是示例代码..

public class FloatingService extends Service {

private WindowManager windowManager;
private View floatingView;

WindowManager.LayoutParams params;
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flag, int startId)
{
    // add window
    showAlert();
    return START_STICKY;
}

private void showAlert() {
    if(windowManager == null || floatingView == null) {
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        floatingView = View.inflate(getBaseContext(),R.layout.floating_layout,null);
        // do your stuff to update the view in layout
        params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.CENTER | Gravity.CENTER;
        windowManager.addView(floatingView, params);
    }
}

@Override
public void onCreate() {
    super.onCreate();
}

@Override
public void onDestroy() {
    super.onDestroy();
    if (floatingView != null) windowManager.removeView(floatingView);
}

Android - 删除addView添加的全屏视图

1 个答案: