Change pause button of audio player on oncomplete listener in android

I'm loading audio sounds into a listview, I play them.When the audio playing is done, i want to change that specific sound's pause button to play button again. here is my code to play sounds

soundChild.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub


                try {

                    player.setDataSource(url);
                    // file.close();
                    player.prepare();
                    player.setLooping(false);
                    // player.start();

                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (SecurityException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalStateException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                if (player.isPlaying()) {
                    if (player != null) {
                        player.pause();
                        // Changing button image to play button
                        soundChild.setImageResource(R.drawable.playbutton);
                    }
                } else {
                    // Resume song
                    if (player != null) {
                        player.start();
                        // Changing button image to pause button
                        soundChild.setImageResource(R.drawable.pausebutton);
                    }
                }
            }
        });

          player.setOnCompletionListener(new OnCompletionListener() {

          @Override public void onCompletion(MediaPlayer mp) { // TODO
         // Auto-generated method stub player.release(); player=null;
              Toast.makeText(_context, "complete", Toast.LENGTH_LONG).show();

              soundChild.setImageResource(R.drawable.playbutton);

              player.reset();


          } });

But on complete listner the imageview of player button is never changed back to play imageview again. I doin't know where i'm doing wrong, because if onComplete is being called then imageview background should also change.please help.