Question

I am having some of the following exceptions:

java.lang.IllegalArgumentException: View not attached to window manager
at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)
at android.view.WindowManagerImpl.updateViewLayout(WindowManagerImpl.java:191)
at android.view.Window$LocalWindowManager.updateViewLayout(Window.java:428)
at android.app.Dialog.onWindowAttributesChanged(Dialog.java:596)
at android.view.Window.setDefaultWindowFormat(Window.java:1013)
at com.android.internal.policy.impl.PhoneWindow.access$700(PhoneWindow.java:86)
at com.android.internal.policy.impl.PhoneWindow$DecorView.drawableChanged(PhoneWindow.java:1951)
at com.android.internal.policy.impl.PhoneWindow$DecorView.fitSystemWindows(PhoneWindow.java:1889)
at android.view.ViewRoot.performTraversals(ViewRoot.java:727)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4338)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
at dalvik.system.NativeStart.main(Native Method)

I have googled it and see that it has something to do with popups and turning the screen, but there is no reference to my code.

The questions are:

1. is there a way to find out
   exactly when this issue is
   happening?
2. other than turning the screen, is there another event or action that triggers this error?
3. how do I prevent this to happen?

Answer 1

I had this issue where on a screen orientation change, the activity finished before the AsyncTask with the progress dialog completed. I seemed to resolve this by setting the dialog to null onPause() and then checking this in the AsyncTask before dismissing.

@Override
public void onPause() {
    super.onPause();

    if ((mDialog != null) && mDialog.isShowing())
        mDialog.dismiss();
    mDialog = null;
}

… in my AsyncTask:

protected void onPreExecute() {
    mDialog = ProgressDialog.show(mContext, "", "Saving changes...",
            true);
}

protected void onPostExecute(Object result) {
   if ((mDialog != null) && mDialog.isShowing()) { 
        mDialog.dismiss();
   }
}