440 Hz audioTrack

Ecco il codice per l'emissione di un LA (440 Hz):

public class MainActivity extends AppCompatActivity {

    AudioTrack audioTrack;
    Button bottone;
    int minBufferSize=AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_8BIT);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        bottone=(Button)findViewById(R.id.button);

        playSound(440,10);


    }

    private void playSound(double frequency, int duration) {
        // AudioTrack definition
        int mBufferSize = AudioTrack.getMinBufferSize(44100,
                AudioFormat.CHANNEL_OUT_STEREO,
                AudioFormat.ENCODING_PCM_8BIT);

        AudioTrack mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,
                AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT,
                mBufferSize, AudioTrack.MODE_STREAM);

        // Sine wave
        double[] mSound = new double[1000000];
        short[] mBuffer = new short[1000000];
        for (int i = 0; i < mSound.length; i++) {
            mSound[i] = Math.sin((2.0*Math.PI * i/(44100/frequency)));
            mBuffer[i] = (short) (mSound[i]*Short.MAX_VALUE);
        }

        mAudioTrack.setStereoVolume(AudioTrack.getMaxVolume(), AudioTrack.getMaxVolume());
        mAudioTrack.play();

        mAudioTrack.write(mBuffer, 0, mSound.length);
        mAudioTrack.stop();
        mAudioTrack.release();

    }

} 

Bene. Me lo salvo e poi vedrò come utilizzarlo.