play sound on button click android studio

1Button one = (Button) this.findViewById(R.id.button1);
2final MediaPlayer mp = MediaPlayer.create(this, R.raw.soho);
3one.setOnClickListener(new OnClickListener(){
4
5    public void onClick(View v) {
6        mp.start();
7    }
8});

1public class MainActivity extends AppCompatActivity{
2	Button bt;
3	
4	@Override
5	protected void onCreate(Bundle savedInstanceState){
6		super.onCreate(savedInstanceState);
7		setContentView(R.layout.activity_main);
8		bt = (Button)findViewById(R.id.clickme);
9		final MediaPlayer mp = MediaPlayer.create(this, R.raw.sample);
10		bt.setOnClickListener(new View.OnClickListener(){
11			@Overridepublic void onClick(View view){
12				np.start();
13			}
14		}
15	}
16}