Question

您好，我想通过耳机端口将数据从手机发送到手工时钟作为挑战。因此，我决定使用不同的音频频率作为不同的消息。例如，左声道1KHz表示小时，1.1KHz表示分钟，1.2KHz表示日，右声道1KHz表示1，1.1KHz表示2，依此类推。现在，我要发出声音了：

public class SetTimeAndDay_Activity extends Activity {
    private final int duration = 1; // seconds
    private final int sampleRate = 16000;
    private final int numSamples = duration * sampleRate;
    private final double sample[] = new double[numSamples];
    private final double freqOfTone = 1000; // hz
    private final byte generatedSnd[] = new byte[2 * numSamples];

    Handler handler = new Handler();

    int Hour, Minute, Day;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.settime_layout);

        //<editor-fold desc="Get Real Time">
        final Calendar real = Calendar.getInstance();
        Hour = real.get(Calendar.HOUR_OF_DAY);
        Minute = real.get(Calendar.MINUTE);
        Day = real.get(Calendar.DAY_OF_WEEK);
        //</editor-fold>

        //<editor-fold desc="Preset View">
        TextView timetxt = findViewById(R.id.SetTime_Time_Txt);
        TextView datetxt = findViewById(R.id.SetTime_Day_Txt);
        ProgressBar progressBar= findViewById(R.id.SetTime_progressBar);
        timetxt.setText(Hour + ":" + Minute);
        datetxt.setText(getResources().getTextArray(R.array.WDay)[Day]);
        progressBar.setMax(100);
        progressBar.setProgress(1);
        //</editor-fold>


        // Use a new tread as this can take a while
        final Thread thread = new Thread(new Runnable() {
            public void run() {
                genTone();
                handler.post(new Runnable() {

                    public void run() {
                        playSound();
                    }
                });
            }
        });
        thread.start();

    }

    void genTone(){
        // fill out the array
        for (int i = 0; i < numSamples; ++i) {
            sample[i] = Math.sin(2 * Math.PI * i / (sampleRate/freqOfTone));
        }

        // convert to 16 bit pcm sound array
        // assumes the sample buffer is normalised.
        int idx = 0;
        for (final double dVal : sample) {
            // scale to maximum amplitude
            final short val = (short) ((dVal * 32767));
            // in 16 bit wav PCM, first byte is the low order byte
            generatedSnd[idx++] = (byte) (val & 0x00ff);
            generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);

        }
    }

    void playSound(){
        final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
                sampleRate, AudioFormat.CHANNEL_OUT_MONO,
                AudioFormat.ENCODING_PCM_16BIT, numSamples,
                AudioTrack.MODE_STATIC);
        audioTrack.write(generatedSnd, 0, generatedSnd.length);
        audioTrack.play();
    }
}

但是有一些问题！

起初，我无法将声音duration降低一秒。

第二个问题是我不知道何时可以发送下一条消息。我的意思是我怎么能意识到消息已发送。

下一个问题是，当我定义要播放的front_left通道时，它也从右通道播放。

最后一个问题是我无法意识到耳机端口是否已连接。请以任何方式帮助我，不要给我减去。

如何使用耳机端口发送数据

0 个答案: