MainActivity.java

final Drawable drawablePlay = getDrawable(R.drawable.btn_playback_play_normal);
final Drawable drawablePause = getDrawable(R.drawable.btn_playback_pause_normal);

binding.playButtonImageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if(binding.playButtonImageView.getDrawable().getConstantState().equals(drawablePlay.getConstantState())){
            if (mHwAudioPlayerManager != null){
                mHwAudioPlayerManager.play();
                binding.playButtonImageView.setImageDrawable(getDrawable(R.drawable.btn_playback_pause_normal));
                isReallyPlaying = true;
            }
        }
        else if(binding.playButtonImageView.getDrawable().getConstantState().equals(drawablePause.getConstantState())){
            if (mHwAudioPlayerManager != null) {
                mHwAudioPlayerManager.pause();
                binding.playButtonImageView.setImageDrawable(getDrawable(R.drawable.btn_playback_play_normal));
                isReallyPlaying = false;
            }
        }
    }
});

binding.nextSongImageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (mHwAudioPlayerManager != null) {
            mHwAudioPlayerManager.playNext();
            isReallyPlaying = true;
        }
    }
});

binding.previousSongImageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (mHwAudioPlayerManager != null) {
            mHwAudioPlayerManager.playPre();
            isReallyPlaying = true;
        }
    }
});