Delegate between fragment and Activity called but visibility change not triggered

Question

I have a viewpager. It has 3 pages. From activity i have to play some music file when button pressed on fragment. During play, few button will be hide and after play button will be visible. So i use a delegate to communicate between Activity and Fragment. Delegate function fired after play finish but always return to fragment no 0 or 2. Always skip no 1 fragment. So either it enables page 1 or page 3 buttons but not page 2. Please help.

(Sorry for my bad English)

My Interface:

PlayResult.java

public interface PlayResult {
    void PlayCompleted(boolean output);
}

PlayActivity.java

public PlayResult playDelegate = null;
void play()
{
try
        {
            try {
                if(mp != null && mp.isPlaying())
                    mp.stop();
                mp = null;
            }
            catch (Exception ex){}
            mp = MediaPlayer.create(PlayActivity.this, StaticClass.getAudioResourceId(fileName, PlayActivity.this));
            mp.start();
            mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mediaPlayer) {
                    try {
                        mp.stop();
                        mp.release();
                    }
                    catch (Exception ex){}
                    if(playingButton != null)
                    {
                        try {
                            Thread.sleep(1000);
                            playMusic(dm.audio, dm, null, showButton);
                        }
                        catch (Exception ex)
                        {
                            //Log.e("error thread", ex.getMessage());
                        }
                    }
                    else
                    {
                        playDelegate.PlayCompleted(true);
                        //showButton();
                    }



                }
            });
        }
        catch (Exception ex){ //Log.e("error playing", ex.getMessage()+ ex.getCause());

        }

}

and in my fragment

viewpager_fragment.java

PlayActivity playActivity;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            view = inflater.inflate((R.layout.viewpager_layout), container, false);
            _context = view.getContext();

           imgButton1 = (ImageView) view.findViewById(R.id.imgButton1);

           imgButton1.setOnClickListener(new View.OnClickListener() {
            @Override
             public void onClick(View v) {
               playMusic(dm.b1audio, dm, imgButton1,imgButton1);
             }
           });
         imgButton2 = (ImageView) view.findViewById(R.id.imgButton2);

         imgButton2.setOnClickListener(new View.OnClickListener() {
         @Override
              public void onClick(View v) {
                 playMusic(dm.b2audio, dm, imgButton2,imgButton2);
          }
         });

        img = (ImageView) view.findViewById(R.id.image);
        img.setImageResource(StaticClass.getResourceId(dm.image, _context));


             btnMoveForward = (ImageView) view.findViewById(R.id.btnMoveForward);
                playActivity = (PlayActivity) getActivity();
                playActivity.playDelegate = this;


         }



     private void showButton()
        {
            btnMoveBackward.setVisibility(View.VISIBLE);
            btnMoveForward.setVisibility(View.VISIBLE);
            btnHome.setVisibility(View.VISIBLE);

            imgButton1.setVisibility(View.VISIBLE);
            imgButton2.setVisibility(View.VISIBLE);
            imgButton1.setEnabled(true);
            imgButton2.setEnabled(true);

        }
     void playMusic(String fileName, final DataModel dm , final ImageView playingButton, final ImageView showButton)
        {
            hideButton(showButton);
            playActivity.playMusic(fileName, dm, playingButton, showButton);
        }

        @Override
        public void PlayCompleted(boolean output) {

            showButton();
            Log.e("Play completed del", "from delegate"+ ", dm "+dm.pageno+ btnHome.getVisibility());
        }

show button method is not called or the buttons are not toggling? where are the buttons within showButton() initialized? — Suraj Rao, Dec 05 '16 at 06:12
those buttons are initilized in onCreateView(). There is lots of garbase codes in there and i failed to mention it. sorry. — Tonmoy chowdhury, Dec 05 '16 at 06:26

score 1 · Answer 1 · answered Dec 05 '16 at 06:21

1

problem is callback should be in fragment as you name delegate. with interface object you cqn call method in fragme t when you click, but that method should be implemeneted in activity. you are almost doing otherwise.

answered Dec 05 '16 at 06:21

Vurgun M

97
1
5

score 1 · Accepted Answer · edited May 23 '17 at 12:24

1

You are setting the delegate in fragment.createView You are also using ViewPager to handle the fragments which handles their lifecycle. So each time the pager creates a new fragment, your delegate in the activity is replaced.

View pager and fragment lifecycle

This shows how to figure out which fragment is currently visible.

edited May 23 '17 at 12:24

Community

1
1

answered Dec 05 '16 at 07:27

Suraj Rao

29,388
11
94
103

Delegate between fragment and Activity called but visibility change not triggered

2 Answers2