解决android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActiv

本文探讨了在TabHost中弹出对话框导致的“BadTokenException”异常问题。当一个Activity(A)依附于另一个Activity(B)时,若ActivityB被回收,会导致弹出对话框时出现异常。文章提供了解决方案:在A中创建Dialog时,应使用依附的Activity对象(通过getParent方法获取)作为上下文。
最近遇到这样的一个问题,在tabhost中弹出对话框或者弹出一个下拉菜单,总是会报一个
“android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@435def20 is not valid; is your activity running? ”
这样的异常,后来经过研究查资料发现,原来当一个activity(A)依附于另一个activity(B)时,弹出对话框就会报错,原因在于activity B 有可能会被系统回收,这样就不能保证程序的正常运行。所以在A中创建Dialog时,传递的上下文对象不能是当前的activity而应该是依附的那个activity对象(该对象可以通过getParent方法得到)
``` FATAL EXCEPTION: main Process: com.oem.qisda, PID: 6430 java.lang.RuntimeException: Unable to create service com.oem.qisda.CpuInfoService: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@9519714 -- permission denied for window type 2038 at android.app.ActivityThread.handleCreateService(ActivityThread.java:4568) at android.app.ActivityThread.access$1700(ActivityThread.java:257) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2111) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7911) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:681) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009) Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@9519714 -- permission denied for window type 2038 at android.view.ViewRootImpl.setView(ViewRootImpl.java:1215) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:400) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:139) at com.oem.qisda.CpuInfoService.onCreate(CpuInfoService.java:105) at android.app.ActivityThread.handleCreateService(ActivityThread.java:4555) at android.app.ActivityThread.access$1700(ActivityThread.java:257)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2111)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loopOnce(Looper.java:201)  at android.os.Looper.loop(Looper.java:288)  at android.app.ActivityThread.main(ActivityThread.java:7911)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:681)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009)```怎么解决
03-08
01-01 00:16:20.586 20968 20968 E AndroidRuntime: FATAL EXCEPTION: main 01-01 00:16:20.586 20968 20968 E AndroidRuntime: Process: com.adayo.service.atsmode, PID: 20968 01-01 00:16:20.586 20968 20968 E AndroidRuntime: android.view.WindowManager$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
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08-06
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