小编use*_*487的帖子

我正在使用 Xamarin for Android 并且我在 AlertDialog.Builder.Show() 方法中收到此错误，但它只发生在一些三星（使用 Android 7.0）设备上，我们尝试了一些其他设备，但这个问题没有不会发生。我只是在使用应用程序一段时间后才得到它。堆栈跟踪如下

  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <f32579baafc1404fa37ba3ec1abdc0bd>:0 
  at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <7802aa64ad574c33adca332a3fa9706a>:0 
  at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in <7802aa64ad574c33adca332a3fa9706a>:0 
  at Android.App.AlertDialog+Builder.Show () [0x0000a] in <dc51acef1f304f0dab449a7fc6039799>:0 
  at Prizma.Controls.Common.BindingComboBox.ShowDialog () [0x00062] in C:\TeamProjects\PrizmaProject\Main\MobileSales.iOS\Prizma.Controls.iOS\Common\BindingComboBox.cs:408 
  --- End of managed Android.Views.WindowManagerBadTokenException stack trace ---
android.view.WindowManager$BadTokenException: Unable to add window -- window android.view.ViewRootImpl$W@cb70704 has already been added
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:902)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:377)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:97)
    at android.app.Dialog.show(Dialog.java:404)
    at android.app.AlertDialog$Builder.show(AlertDialog.java:1136)
    at …