Media Player

Reproductor que Android nos proporciona
Soporta audio y vídeo, distintos tipos de archivos (MPEG4, H.264, MP3, AAC, …)
Distintos estados: Idle, initialized, prepared, started, paused, stopped, …

Media Player

Ejemplo

Text

MediaPlayer mediaPlayer = new MediaPlayer();
File sdCard = Environment.getExternalStorageDirectory();
File song = new File(sdCard.getAbsolutePath() + "/Music/Song.mp3");

try{
    mediaPlayer.setDataSource(song.getAbsolutePath());
    mediaPlayer.prepare();
    mediaPlayer.setOnCompletionListener(...onCompletion...);
}
catch ...

//Reproducir una cancion de la carpeta raw
mediaPlayer = MediaPlayer.create(context, R.raw.song_name);


//Funciones de control
mediaPlayer.start();
mediaPlayer.pause();
mediaPlayer.stop();
mediaPlayer.release();

Ejemplo 2: Música del dispositivo

Desde Android 6.0 hay que pedir los permisos en runtime ANTES de acceder al EXTERNAL STORAGE

 if (ContextCompat.checkSelfPermission(Music.this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(Music.this,
            Manifest.permission.READ_EXTERNAL_STORAGE)) {
        // Show an expanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
        // No explanation needed, we can request the permission.
        ActivityCompat.requestPermissions(Music.this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                REQUEST_CODE_CONSTANT_EXTERNAL_STORAGE);
        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}

Ejemplo 2: Música del dispositivo

Tenemos que implementar la función
```
onRequestPermissionsResult
```

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        case REQUEST_CODE_CONSTANT_EXTERNAL_STORAGE: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
            return;
        }
        // other 'case' lines to check for other
        // permissions this app might request
    }
}

Ejemplo 2: Música del dispositivo

Sólo si los permisos han sido concedidos podemos ejecutar la activity para escoger la canción

if(ContextCompat.checkSelfPermission(Music.this,Manifest.permission.READ_EXTERNAL_STORAGE)
                                == PackageManager.PERMISSION_GRANTED) {
    Intent intent1 = new Intent(Intent.ACTION_PICK, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent1, 1);
}

Ejemplo 2: Música del dispositivo

Si hemos aceptado los permisos se habrá ejecutado el startActivityForResult y tenemos que recoger el path de la canción escogida.

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK) {
            if (requestCode == 1) {
                try {
                    /* Aquí tenemos que resetear el media player 
                    y a continuación cargamos la canción */
                    {...}
                    mediaPlayer.setDataSource(this,data.getData());
                    /* Con la canción ya cargada, tenemos que reproducir la canción */
                    {...}
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }