MediaBrowser.subscribe doesn't work after I get back to activity 1 from activity 2 (6.0.1 Android)

Question

When I open activity 1 (Main/Launcher activity of the app), that includes MediaBrowser connection, MediaBrowser.subscribe works ok (onChildrenLoaded is being called after it), but when I opened some other activity (number 2) from activity 1 (using button click listener and intent) and then close this activity 2, MediaBrowser.subscribe stops working - onChildrenLoaded is NOT being called after subscribing, so after activity 2 finishes onConnected of SubscriptionCallback (of activity 1) & mMediaBrowser.subscribe(MEDIA_ID_ROOT, mSubscriptionCallback); are being called but my items aren't updated because onChildrenLoaded is never triggered

private MediaBrowserCompat.ConnectionCallback mConnectionCallback =
            new MediaBrowserCompat.ConnectionCallback() {
                @Override
                public void onConnected() {
                    Log.i(TAG, "onConnected");
                    mMediaBrowser.unsubscribe(MEDIA_ID_ROOT, mSubscriptionCallback);
                    mMediaBrowser.subscribe(MEDIA_ID_ROOT, mSubscriptionCallback);

                }
            };

private MediaBrowserCompat.SubscriptionCallback mSubscriptionCallback = new MediaBrowserCompat.SubscriptionCallback() {

        @Override
        public void onChildrenLoaded(String parentId, List<MediaBrowserCompat.MediaItem> children) {
            Log.i(TAG, "onChildrenLoaded"); // isn't being called on android 6.0.1 after I got back to this activity from other
        if (children != null) {
            if (mMediaItems != null) {
                mMediaItems.clear();
                mMediaItems = null;
            }
            mMediaItems = children;
            if (mAdapter == null) {
                mAdapter = new Adapter();
                mRecyclerView.setAdapter(mAdapter);
            } else {
                mAdapter.notifyDataSetChanged();
            }
        }
        }

        @Override
        public void onError(String id) {
            Log.i(TAG, "SubscriptionCallback onError");
        }
    };

But it works ok for 4.4.4 Android (no such problems)

Update

It seems like I found this problem on Google Bugs (some Developer reported it): https://code.google.com/p/android/issues/detail?can=2&start=0&num=100&q=-has%3Asubcomponent%20-has%3Atarget%20emulator%20.&colspec=ID%20Status%20Priority%20Owner%20Summary%20Stars%20Reporter%20Opened&groupby=&sort=&id=232455

But there is no solution

Also have such error:

04-02 18:25:55.519 11250-11250/com.android.player W/MBServiceCompat: removeSubscription for callback that isn't registered id=hhhh
04-02 18:25:55.519 11250-11250/com.android.player W/MBServiceCompat: addSubscription for callback that isn't registered id=hhhh
04-02 18:25:55.525 11250-11250/com.android.player W/MBServiceCompat: removeSubscription for callback that isn't registered id=hhhh
04-02 18:25:55.525 11250-11250/com.android.player W/MBServiceCompat: addSubscription for callback that isn't registered id=hhhh

Update 2

Also there

https://github.com/googlesamples/android-UniversalMusicPlayer/issues/92

mb last comment of this link will solve this problem for me too

Update 3

Yeah, github.com/googlesamples/android-UniversalMusicPlayer/issues/92#issuecomment-287668132 SOLVED the problem:

move MediaBrowserCompat.connect() from onStart() to onCreate(), and move MediaBrowserCompat.disconnect() from onStop() to onDestroy(). It works now.

What version of the Support Library were you using? Could you reproduce this on the latest (25.3.1)? — ianhanniballake, Apr 03 '17 at 17:12
If you have a super small sample project that demonstrates the issue, could you attach it to the bug you linked to? — ianhanniballake, Apr 03 '17 at 18:45

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

This issue was marked as fixed at google issuetracker in Support Lib v 25.4.0
solution to

move MediaBrowserCompat.connect() from onStart() to onCreate(), and move MediaBrowserCompat.disconnect() from onStop() to onDestroy()

works for me.

when I moved them and fixed the original issue, the next one appeared: MediaController Callback didn't work. It seems for me as caused by the similar bug. So I have moved call to unsubscribe() to onDestroy() too, and everything works now.

So my code now looks like:

protected void onCreate(Bundle savedInstanceState) {
    ...    
    mediaBrowser = new MediaBrowserCompat(this, new ComponentName(this, AudioService.class),
            connCallbacks,
            null);
    mediaBrowser.connect();
    ...
}

@Override
protected void onStart() {
    super.onStart();
}

@Override
protected void onStop() {
    super.onStop();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    MediaControllerCompat cntrlr = MediaControllerCompat.getMediaController(this);
    if(cntrlr != null) {
        cntrlr.unregisterCallback(cntrlrCallback);
    }
    if(mediaBrowser.isConnected()) {
        mediaBrowser.unsubscribe(mediaBrowser.getRoot());
        mediaBrowser.disconnect();
    }
}

score 0 · Accepted Answer · answered May 08 '17 at 17:41

Temporary solution:

move MediaBrowserCompat.connect() from onStart() to onCreate(), and move MediaBrowserCompat.disconnect() from onStop() to onDestroy(). It works now.

Must be fixed in v25.4.0: https://issuetracker.google.com/issues/37133265#comment3

score 0 · Answer 3 · answered Jan 03 '18 at 10:38

0

With reference to Google issue tracker.

Issue is fixed and released in 25.4.0 version of support library.

If any issue persists, please report at Google issue tracker they will re-open to examine.

answered Jan 03 '18 at 10:38

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MediaBrowser.subscribe doesn't work after I get back to activity 1 from activity 2 (6.0.1 Android)

3 Answers3

So my code now looks like:

Linked