Unable to add window -- token null is not for an application

本文分析了在Android开发中遇到的“android.view.WindowManager$BadTokenException”异常,并提供了解决方案。该异常通常发生在尝试使用非Activity Context创建AlertDialog时。文章强调了正确使用Activity Context的重要性。

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android.view.WindowManager$BadTokenException:Unable to add window -- token null is not for anapplication

分析:

问题在于newAlertDialog.Builder(Context),虽然这里的参数是AlertDialog.Builder(Contextcontext)

但我们不能使用getApplicationContext()获得的Context,而必须使用Activity的Context对象,因为只有一个Activity才能添加一个窗体。  

解决方法:

将new AlertDialog.Builder(Contextcontext)中的参数用Activity的Context对象即可.

01-01 00:16:20.586 20968 20968 E AndroidRuntime: FATAL EXCEPTION: main 01-01 00:16:20.586 20968 20968 E AndroidRuntime: Process: com.adayo.service.atsmode, PID: 20968 01-01 00:16:20.586 20968 20968 E AndroidRuntime: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.view.ViewRootImpl.setView(ViewRootImpl.java:1071) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:409) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:109) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.app.Dialog.show(Dialog.java:340) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.app.AlertDialog$Builder.show(AlertDialog.java:1131) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.widget.VideoView$5.onError(VideoView.java:615) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:3446) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.os.Looper.loop(Looper.java:223) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7687) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 01-01 00:16:20.586 20968 20968 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 01-01 00:16:21.454 20968 20968 I Process : Sending signal. PID: 20968 SIG: 9
最新发布
08-06
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