token android.os.BinderProxy@e4f4f2b is not valid; is your activity running?

Question

I am getting below crash exclusively at app launch time and only in Emulator & Debug

Emulator & Run : OK

Device & Run: OK

Device & Debug: OK

Emulator & Debug: CRASH!

It looks like Android is trying to do a Toast at launch time, and as I don't have many Toast and having added a breakpoint on all of them, I can exclude that it is one of mine.

Is there a way to find out what message Android is trying to show and to which Activity it is referring? Logcat doesn't show anything abnormal before the crash occurs.

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@e4f4f2b is not valid; is your activity running?
        at android.view.ViewRootImpl.setView(ViewRootImpl.java:679)
        at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342)
        at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
        at android.widget.Toast$TN.handleShow(Toast.java:459)
        at android.widget.Toast$TN$2.handleMessage(Toast.java:342)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Answer 1

This is most likely happening because you are trying to show a dialog after the execution of a background thread, while the Activity is being destroyed.

Here's what worked for me:

if(!((Activity) context).isFinishing())
{
    //show dialog
}

It's working perfectly for me, using this practice for years now.