Android 解析 Unable to add window is your activity running?

错误堆栈：

    Process: com.example.caoxinyu.myapplication, PID: 22745android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@2205c13 is not valid; is your activity running?at android.view.ViewRootImpl.setView(ViewRootImpl.java:814)at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:373)at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:95)at android.app.Dialog.show(Dialog.java:342)at android.support.v7.app.AlertDialog$Builder.show(AlertDialog.java:1007)at com.example.caoxinyu.myapplication.Main2Activity$1.run(Main2Activity.java:24)at android.os.Handler.handleCallback(Handler.java:873)at android.os.Handler.dispatchMessage(Handler.java:99)at android.os.Looper.loop(Looper.java:193)at android.app.ActivityThread.main(ActivityThread.java:6743)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:486)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:882)

复现步骤：

public class Main2Activity extends AppCompatActivity {private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);handler = new Handler();handler.postDelayed(new Runnable() {@Overridepublic void run() {AlertDialog.Builder builder = new AlertDialog.Builder(Main2Activity.this);builder.setTitle("aaaaa");builder.setMessage("aaaaa");builder.setNegativeButton("fjff",null);builder.setPositiveButton("ffffssss",null).show();}},5000);}
}

当我们打开Activity 之后，等5s dailog 显示的时候，就会直接崩溃，堆栈就是上面的堆栈。

崩溃时候的调试信息如下：

可以发现，token 是null.

我们看到，其实是同mTokenMap 里面获取的。

mTokenMap 的key是binder。

## 那么什么时候 addToken的呢？

增加token

at com.android.server.wm.DisplayContent.addWindowToken(DisplayContent.java:845)at com.android.server.wm.DisplayContent.reParentWindowToken(DisplayContent.java:886)at com.android.server.wm.WindowToken.onDisplayChanged(WindowToken.java:270)at com.android.server.wm.WindowToken.<init>(WindowToken.java:124)at com.android.server.wm.WindowToken.<init>(WindowToken.java:112)at com.android.server.wm.AppWindowToken.<init>(AppWindowToken.java:290)at com.android.server.wm.AppWindowToken.<init>(AppWindowToken.java:272)at com.android.server.wm.AppWindowContainerController.createAppWindow(AppWindowContainerController.java:246)at com.android.server.wm.AppWindowContainerController.<init>(AppWindowContainerController.java:230)- locked <0x3d36> (a com.android.server.wm.WindowHashMap)at com.android.server.wm.AppWindowContainerController.<init>(AppWindowContainerController.java:200)at com.android.server.am.ActivityRecord.createWindowContainer(ActivityRecord.java:1012)at com.android.server.am.ActivityStack.startActivityLocked(ActivityStack.java:2925)at com.android.server.am.ActivityStarter.startActivityUnchecked(ActivityStarter.java:1496)at com.android.server.am.ActivityStarter.startActivity(ActivityStarter.java:1257)at com.android.server.am.ActivityStarter.startActivity(ActivityStarter.java:879)at com.android.server.am.ActivityStarter.startActivity(ActivityStarter.java:551)at com.android.server.am.ActivityStarter.startActivityMayWait(ActivityStarter.java:1156)- locked <0x3921> (a com.android.server.am.ActivityManagerService)at com.android.server.am.ActivityStarter.execute(ActivityStarter.java:490)at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:5109)at com.android.server.am.ActivityManagerService.startActivityAsUser(ActivityManagerService.java:5083)at com.android.server.am.ActivityManagerService.startActivity(ActivityManagerService.java:5074)at android.app.IActivityManager$Stub.onTransact$startActivity$(IActivityManager.java:13759)at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:2681)at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:3282)at android.os.Binder.execTransact(Binder.java:740)

我们看到当activity 启动的时候，就会去把token 放到map 里面。

移除token:

   at com.android.server.wm.DisplayContent.removeWindowToken(DisplayContent.java:866)at com.android.server.wm.DisplayContent.removeAppToken(DisplayContent.java:890)at com.android.server.wm.AppWindowContainerController.removeContainer(AppWindowContainerController.java:260)- locked <0x3d36> (a com.android.server.wm.WindowHashMap)at com.android.server.am.ActivityRecord.removeWindowContainer(ActivityRecord.java:1032)at com.android.server.am.ActivityStack.removeActivityFromHistoryLocked(ActivityStack.java:4123)at com.android.server.am.ActivityStack.activityDestroyedLocked(ActivityStack.java:4406)at com.android.server.am.ActivityStack.activityDestroyedLocked(ActivityStack.java:4386)at com.android.server.am.ActivityManagerService.activityDestroyed(ActivityManagerService.java:8070)- locked <0x3921> (a com.android.server.am.ActivityManagerService)at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:3347)at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:3282)at android.os.Binder.execTransact(Binder.java:740)

我们看到当activity destory 的时候，就会去把token 从map 里面移除掉。

如果你在activity onDestory 之后，还用这个activity 去显示了弹窗，那么就会挂掉。

当然当app 挂掉的时候，也会移除token

   at com.android.server.wm.DisplayContent.removeWindowToken(DisplayContent.java:866)at com.android.server.wm.WindowToken.removeImmediately(WindowToken.java:262)at com.android.server.wm.AppWindowToken.removeImmediately(AppWindowToken.java:602)at com.android.server.wm.AppWindowToken.removeIfPossible(AppWindowToken.java:609)at com.android.server.wm.AppWindowToken.onRemovedFromDisplay(AppWindowToken.java:674)at com.android.server.wm.DisplayContent.removeAppToken(DisplayContent.java:903)at com.android.server.wm.AppWindowContainerController.removeContainer(AppWindowContainerController.java:260)- locked <0x3d36> (a com.android.server.wm.WindowHashMap)at com.android.server.am.ActivityRecord.removeWindowContainer(ActivityRecord.java:1032)at com.android.server.am.ActivityStack.removeActivityFromHistoryLocked(ActivityStack.java:4123)at com.android.server.am.ActivityStack.removeHistoryRecordsForAppLocked(ActivityStack.java:4516)at com.android.server.am.ActivityStack.handleAppDiedLocked(ActivityStack.java:5006)at com.android.server.am.ActivityStackSupervisor.handleAppDiedLocked(ActivityStackSupervisor.java:2124)at com.android.server.am.ActivityManagerService.handleAppDiedLocked(ActivityManagerService.java:5895)at com.android.server.am.ActivityManagerService.appDiedLocked(ActivityManagerService.java:6076)at com.android.server.am.ActivityManagerService$AppDeathRecipient.binderDied(ActivityManagerService.java:1897)- locked <0x3921> (a com.android.server.am.ActivityManagerService)at android.os.BinderProxy.sendDeathNotice(BinderProxy.java:579)

解决方法：

        if (getActivity().isFinishing()  || getActivity().isDestroyed()) {return;}

判断activity 的状态，如果是finishing 或者是已经销毁了，那就不要再弹弹窗了。

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