android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?

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Unable to add window -- token null is not valid; is your activity running?
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?	at android.view.ViewRootImpl.setView(ViewRootImpl.java:696)	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:289)	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)	at android.widget.PopupWindow.invokePopup(PopupWindow.java:1153)	at android.widget.PopupWindow.showAtLocation(PopupWindow.java:978)	at android.widget.PopupWindow.showAtLocation(PopupWindow.java:942)	at com.meizu.widget.MagnifierPopupWindow.showMagnifier(MagnifierPopupWindow.java:106)	at android.widget.Editor$MzInsertionPointCursorController.update(Editor.java:5567)	at android.widget.Editor$MzInsertionPointCursorController.show(Editor.java:5571)	at android.widget.Editor.performLongClickMz(Editor.java:5290)	at android.widget.TextView.performLongClick(TextView.java:9126)	at android.view.View$CheckForLongPress.run(View.java:20357)	at android.os.Handler.handleCallback(Handler.java:815)	at android.os.Handler.dispatchMessage(Handler.java:104)	at android.os.Looper.loop(Looper.java:194)	at android.app.ActivityThread.main(ActivityThread.java:5824)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)