CODEWITHSUNDEEP
androidnullpointerexceptionpopupwindow
h32
h32

Reputation: 19

PopupWindow crash on dispatch event

i have a trouble with PopupWindow android default widget. When i touch button to show popup and than press back button on the phone, before popup was shown, i have force close message, the error is next:



    10-14 16:51:53.389: ERROR/AndroidRuntime(3766): FATAL EXCEPTION: main
            java.lang.NullPointerException
            at android.widget.PopupWindow$PopupViewContainer.dispatchKeyEvent(PopupWindow.java:1342)
            at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
            at android.view.ViewRoot.deliverKeyEvent(ViewRoot.java:2431)
            at android.view.ViewRoot.handleMessage(ViewRoot.java:1741)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:123)
            at android.app.ActivityThread.main(ActivityThread.java:4627)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:521)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
            at dalvik.system.NativeStart.main(Native Method)

So, after some tests i see, this bug is reproduces on android < 2.3 versions (2.1 , 2.2) also i'm dig deep into the sources at grepcode, there is method:



        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
                if (event.getAction() == KeyEvent.ACTION_DOWN
                        && event.getRepeatCount() == 0) {
                    getKeyDispatcherState().startTracking(event, this);
                    return true;
                } else if (event.getAction() == KeyEvent.ACTION_UP
                        && getKeyDispatcherState().isTracking(event) && !event.isCanceled()) {
                    dismiss();
                    return true;
                }
                return super.dispatchKeyEvent(event);
            } else {
                return super.dispatchKeyEvent(event);
            }
        }

    ...

        public KeyEvent.DispatcherState getKeyDispatcherState() {
            return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
        }

and method getKeyDispatcherState() return null

Does anyone have solved this problem?

Upvotes: 1

Views: 2153

Answers (2)

Wayne
Wayne

Reputation: 3519

This is a bug on android I believe.

Posted here: http://hg.mozilla.org/releases/mozilla-aurora/rev/caca38771162

Upvotes: 0

sunweidong
sunweidong

Reputation: 11

The focus of this issue is you give focus to the Popupwindow before it is shown, so the dispatchevent will receive the back-key before your activity, but now your Popupwindow is not shown. You can test by not giving the focus to the Popupwindow and you will understand what I mean.

Upvotes: 1

Related Questions