Chơi file nhạc mp3 trên local máy android

import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button btnPlay,btnPause;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 2 tham so, man hinh chay, file media can chay        final MediaPlayer m = MediaPlayer.create(MainActivity.this,R.raw.em);
        btnPlay = (Button) findViewById(R.id.buttonPlay);
        btnPause = (Button) findViewById(R.id.buttonPause);
        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                m.start();
            }

        });
        btnPause.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                m.pause();
            }
        });


    }
}