playpause.java

    private void updatePlayPauseButton() {
        if (!isVisible() || !isAttachedToWindow) {
            return;
        }
        boolean playing = player != null && player.getPlayWhenReady();
        String contentDescription = getResources().getString(
                playing ? com.google.android.exoplayer2.R.string.exo_controls_pause_description : com.google.android.exoplayer2.R.string.exo_controls_play_description);
        playButton.setContentDescription(contentDescription);
        playButton.setImageResource(
                playing ? R.drawable.pausecontrol : R.drawable.playcontrol);
    }