Question

我收到以下异常：

Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
            at android.view.ViewRootImpl.setView(ViewRootImpl.java:566) ~[na:0.0]
            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:272) ~[na:0.0]
            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) ~[na:0.0]
            at android.app.Dialog.show(Dialog.java:298) ~[na:0.0]
            at kujo.app.ui.VerificationCallingDeviceActivity$2.showDialogIfNotShowing(VerificationCallingDeviceActivity.java:162) ~[na:0.0]
            at kujo.app.ui.VerificationCallingDeviceActivity$2.trySigningIn(VerificationCallingDeviceActivity.java:179) ~[na:0.0]
            at kujo.app.ui.VerificationCallingDeviceActivity$2.onReceiveCalled(VerificationCallingDeviceActivity.java:220) ~[na:0.0]
            at kujo.app.ui.IncomingCall.fireListeners(IncomingCall.java:54) ~[na:0.0]
            at kujo.app.ui.IncomingCall.onReceive(IncomingCall.java:79) ~[na:0.0]
            at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:861) ~[na:0.0]

这发生在调用ProgressDialog.show（）函数的行。

我创建了ProgressDialog，如：

new ProgressDialog(VoipApplication.getInstance().getApplicationContext());

其中VoipApplication是一个扩展Application的类。

在某些帖子中，我读到ProgressDialog必须用于Activity。否则会出现此错误。有没有其他方法我可以尝试使用ProgressDialog。

Answer 1

如果您想通知用户正在进行的事情，请使用通知，例如Play商店。

Answer 2

您也可以尝试

new ProgressDialog(MainActivity.this);

或

new ProgressDialog("Class_name that extends Application".getInstance().getApplication());

传递应用程序时，ProgressDialog在Android中抛出错误

2 个答案: