gistfile1.txt

 public void playAudio() {

        if (mediaPlayer == null) {
            mediaPlayer = new MediaPlayer();
        }
        if (!TextUtils.isEmpty(mediaFileUrl)) {
            try {
                mediaPlayer.reset();
                mediaPlayer.setDataSource(mediaFileUrl);
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mediaPlayer.prepare();
                setButtons();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            }
            }
             private void setButtons()
    {
        if (mediaPlayer != null) {
            if (!mediaPlayer.isPlaying()) {
                ivActionPlayVideo.setVisibility(View.VISIBLE);
                ivActionPlayVideo.setImageDrawable(ContextCompat.getDrawable(AudioDetailActivity.this, android.R.drawable.ic_media_pause));
                if (audioLength > 0) {
                    mediaPlayer.seekTo(audioLength);
                }
                mediaPlayer.start();
                ivViewTracker.setVisibility(View.GONE);
                ivRecordingGifMic.setVisibility(View.VISIBLE);
            } else {
                ivActionPlayVideo.setVisibility(View.VISIBLE);
                ivActionPlayVideo.setImageDrawable(ContextCompat.getDrawable(AudioDetailActivity.this, android.R.drawable.ic_media_play));
                if (mediaPlayer != null && mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                    audioLength = mediaPlayer.getCurrentPosition();
                }
                ivViewTracker.setVisibility(View.VISIBLE);
                ivRecordingGifMic.setVisibility(View.GONE);
            }
        }
    }