MediaPlayer

MainActivity

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final     MediaPlayer mp = MediaPlayer.create(this, R.raw.color_brown);
        Button b = (Button) findViewById(R.id.play);
        Button b2= (Button) findViewById(R.id.pause);
        Button b3= (Button) findViewById(R.id.volumedown);
        Button b4= (Button) findViewById(R.id.volumeup);
        b.setOnClickListener(new View.OnClickListener() {
                                 @Override
                                 public void onClick(View v) {
                                     Toast.makeText(MainActivity.this, "Start", Toast.LENGTH_SHORT).show();
                                     mp.start();
                                     mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                                         public void onCompletion(MediaPlayer mp) {
                                             Toast.makeText(MainActivity.this, "Sfarsit de melodie", Toast.LENGTH_LONG).show();
                                         }
                                     });
                                 }
                             });
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mp.pause();
            }
        });
        b3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AudioManager     audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                        AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
            }
        });
        b4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AudioManager     audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                        AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
            }
        });}}