视图已添加到窗口管理器

Question

我的服务中有 2 个视图，我想根据某些情况切换它们。我正在做什么来进行切换，删除第一个视图，然后添加第二个视图。这是我的代码：

public void switchView(boolean toCallView) {
        if (toCallView) {
            if (lockScreenLayout != null && lockScreenLayout.getParent() != null && lockScreenLayout.getWindowToken() != null)
                windowManager.removeView(lockScreenLayout);
            if (callScreenLayout != null && callScreenLayout.getWindowToken() == null)
                windowManager.addView(callScreenLayout, layoutParams);
        } else {
            if (callScreenLayout != null && callScreenLayout.getParent() != null && callScreenLayout.getWindowToken() != null)
                windowManager.removeViewImmediate(callScreenLayout);
            if (lockScreenLayout != null && lockScreenLayout.getParent() != null && lockScreenLayout.getWindowToken() == null)
                windowManager.addView(lockScreenLayout, layoutParams); // exception raise here
        }
    }

但在某些情况下，我仍然会遇到应用程序崩溃，但出现以下异常：

ACRA caught a RuntimeException for com.myapp
java.lang.RuntimeException: Error receiving broadcast Intent { act=intent.activate.incoming.call.screen flg=0x10 (has extras) } in com.myapp.activity.LockScreenService$9@e94ff0a
    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:895)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:234)
    at android.app.ActivityThread.main(ActivityThread.java:5524)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: View android.widget.RelativeLayout{d4d82ee V.E...... ......ID 0,0-720,1184} has already been added to the window manager.
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:281)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:86)
    at com.myapp.util.IncomingCallHandler.switchView(IncomingCallHandler.java:73)
    at com.myapp.activity.LockScreenService$9.onReceive(LockScreenService.java:270)
    at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:885)
    ... 7 more

谁能给我提示如何避免这种情况。

Answer 1

如异常所述，lockScreenLayout 已添加到WindowManager，无法再次添加。因此，您有两种选择来防止这种情况：

第一

编辑你的逻辑。不应该出现你的某些条件被击中两次的情况

第二

检查视图是否已添加。像这样的：

if (!lockScreenLayout.isShown()) 
{
    // Add child to window
}