如何在录制时检索数据并在屏幕上将其显示为图形（Visualizer）？

Question

Record.java

public void onClick(View v) {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mRecorder.setOutputFile(mFilename);
    mVisualizer = new Visualizer(0);
    mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
    mVisualizer.setDataCaptureListener(datacaptureListener,Visualizer.getMaxCaptureRate() /2,false,true);
    mVisualizer.setEnabled(true);
    mRecorder.setOnErrorListener(errorListenerForRecorder);
    try {
        mRecorder.prepare();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        System.out.println("****");
        mRecorder.start();
    } catch (Exception e) {
        Toast.makeText(getApplicationContext(), "Error :: " + e.getMessage(), Toast.LENGTH_LONG).show();
    }

}
}

OnDataCaptureListener datacaptureListener = new OnDataCaptureListener() {
    @Override
    public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,int samplingRate) {
        System.out.println("1--->");
        mVisualizerView.updateVisualizer(bytes);
    }

    public void onFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate {
        System.out.println("2--->");
        mVisualizerView.updateVisualizer(bytes);
    }
};

VisualizerView.java

    public class VisualizerView extends View {

      private byte[] mBytes;
      private float[] mPoints;
      private Rect mRect = new Rect();

      private Paint mForePaint = new Paint();

     public VisualizerView(Context context) {
         super(context);
         init();
     }

     private void init() {
         mBytes = null;

         mForePaint.setStrokeWidth(1f);
         mForePaint.setAntiAlias(true);
         mForePaint.setColor(Color.rgb(0, 128, 255));
     }

     public void updateVisualizer(byte[] bytes) {
         System.out.println("3--->");
         mBytes = bytes;
         System.out.println(mBytes);
         invalidate();
     }

     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);

         if (mBytes == null) {
             return;
         }

         if (mPoints == null || mPoints.length < mBytes.length * 4) {
             mPoints = new float[mBytes.length * 4];
         }

         mRect.set(0, 0, getWidth(), getHeight());

         for (int i = 0; i < mBytes.length - 1; i++) {
             mPoints[i * 4] = mRect.width() * i / (mBytes.length - 1);
             mPoints[i * 4 + 1] = mRect.height() / 2
                     + ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128;
             mPoints[i * 4 + 2] = mRect.width() * (i + 1) / (mBytes.length - 1);
             mPoints[i * 4 + 3] = mRect.height() / 2
                     + ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2) / 128;
         }

         canvas.drawLines(mPoints, mForePaint);
     }

}

以上是我对MediaRecord的设置。我在录制时使用“datacaptureListener”来获取数据。

我设置了Visualizer（0），它定义为从外部通道获取字节流。我可以将麦克风的声音完美地录制成.3pg音频文件，但我希望从录音中获取二进制或十进制数据。

我创建了另一个文件VisualizerView.java并使用类画布根据捕获的数据绘制图形。

现在的问题是系统只能输出数据的地址（使用函数“updateVisualizer”，

我不知道地址是否包含我需要的数据），程序将转到“OnDraw”功能。有没有熟悉Visualizer的人可以帮助我？

THX！