public class sea extends AppCompatActivity {
    Context context = this;
    MediaPlayer mp;
    MediaPlayer mp1;
    MediaPlayer mp2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sea);
        mp = MediaPlayer.create(context, R.raw.sea);
        mp1 = MediaPlayer.create(context, R.raw.meln2);
        mp2 = MediaPlayer.create(context, R.raw.meln2);
        Button waves = (Button)findViewById(R.id.waves);
        Button meln = (Button)findViewById(R.id.meln);
        Button meln2 = (Button)findViewById(R.id.meln2);
        waves.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try {
                    if (mp.isPlaying()) {
                        mp.stop();
                        mp.release();
                        mp = MediaPlayer.create(context, R.raw.sea);
                    }
                    mp.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

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

                try {
                    if (mp1.isPlaying()) {
                        mp1.stop();
                        mp1.release();
                        mp1 = MediaPlayer.create(context, R.raw.meln2);
                    }
                    mp1.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        });
        meln2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try {
                    if (mp2.isPlaying()) {
                        mp2.stop();
                        mp2.release();
                        mp2 = MediaPlayer.create(context, R.raw.meln2);
                    }
                    mp2.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        });

    }