Unable to add window -- token android.view.ViewRootImpl$W@e3124a is not vali

环境：
在PopopWindow里面使用Spinner组件，会报错如下：

E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.sg.huosansihu, PID: 30027android.view.WindowManager$BadTokenException: Unable to add window -- token android.view.ViewRootImpl$W@e3124a is not valid; is your activity running?at android.view.ViewRootImpl.setView(ViewRootImpl.java:709)at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:319)at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)at android.widget.PopupWindow.invokePopup(PopupWindow.java:1272)at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:1119)at android.widget.ListPopupWindow.show(ListPopupWindow.java:663)at android.widget.Spinner$DropdownPopup.show(Spinner.java:1236)at android.widget.Spinner.performClick(Spinner.java:765)at androidx.appcompat.widget.AppCompatSpinner.performClick(AppCompatSpinner.java:443)at android.view.View$PerformClick.run(View.java:21559)at android.os.Handler.handleCallback(Handler.java:815)at android.os.Handler.dispatchMessage(Handler.java:104)at android.os.Looper.loop(Looper.java:207)at android.app.ActivityThread.main(ActivityThread.java:5845)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:768)

解决方法：
在Spinner组件XML属性里面添加如下内容：

android:spinnerMode="dialog"

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