Android play background music android button audio at the same time

import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.SoundPool;import android.os.Build;import android.os.Bundle;import android.support.annotation.RawRes;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Toast;import java.util.HashMap;public class MainActivity extends AppCompatActivity {    MediaPlayer mediaPlayer;    SoundPool soundPool;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mediaPlayer = playBackgroundMusic(this, R.raw.audio_bg, true);        findViewById(R.id.main_play_audio).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                soundPool = playSoundPoolAudio(R.raw.audio_pup_window);            }        });    }    @Override    protected void onResume() {        super.onResume();        if (!mediaPlayer.isPlaying()) {            mediaPlayer.start();        }        soundPool.autoResume();    }    @Override    protected void onPause() {        super.onPause();        if (mediaPlayer.isPlaying()) {            mediaPlayer.pause();        }        soundPool.autoPause();    }    @Override    protected void onDestroy() {        super.onDestroy();        if (mediaPlayer.isPlaying()) {            mediaPlayer.stop();        }        mediaPlayer.release();    }    private MediaPlayer playBackgroundMusic(Context context, @RawRes int res, boolean loop) {        MediaPlayer mp;        mp = MediaPlayer.create(context, res);        mp.setLooping(loop);        mp.start();        Toast.makeText(context, "Play background music!", Toast.LENGTH_SHORT).show();        return mp;    }    private SoundPool playSoundPoolAudio(@RawRes int res) {        AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);        assert am != null;        float currentStreamVolume = am.getStreamVolume(AudioManager.STREAM_MUSIC);        float maxStreamVolume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);        float setVolume = currentStreamVolume / maxStreamVolume;        SoundPool sp;        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            sp = new SoundPool.Builder()                    .setMaxStreams(3)                    .build();        } else {            sp = new SoundPool(3, AudioManager.STREAM_MUSIC, 1);        }        HashMap hm = new HashMap<>();        hm.put("audio_1", sp.load(this, res, 0));        sp.play(hm.get("audio_1"), setVolume, setVolume, 1, 0, 1.0f);        Toast.makeText(MainActivity.this, "Play audio! ", Toast.LENGTH_SHORT).show();        return sp;    }}
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