我想在持续发出噪音时激活传感器（Android Studio）

我正在学习编程，但事实是我没有太多想法。我正在编写一个由音频传感器组成的应用程序，当在房屋中听到噪音时，它就会被激活。我目前有此代码。

活动检测噪声

public class DetectNoise {




   // This file is used to record voice
   static final private double EMA_FILTER = 0.6;

   private MediaRecorder mRecorder = null;
   private double mEMA = 0.0;

   public void start() {



       if (mRecorder == null) {


           mRecorder = new MediaRecorder();
           mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
           mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
           mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
           mRecorder.setOutputFile("/dev/null");

           try {
               mRecorder.prepare();
               mRecorder.start();
               mEMA = 0.0;
           } catch (IllegalStateException e) {
               Log.e("Error",e.toString());
               e.printStackTrace();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               Log.e("Error",e.toString());
               e.printStackTrace();
           }

       }
   }



public double getAmplitude() {



       if (mRecorder != null)
           //return  (mRecorder.getMaxAmplitude()/1100.0);


           return   20 * Math.log10(mRecorder.getMaxAmplitude() / 2000);
       else
           return 0;

   }

public double getAmplitudeEMA() {
       double amp = getAmplitude();
       mEMA = EMA_FILTER * amp + (1.0 - EMA_FILTER) * mEMA;
       return mEMA;
   }

活动一

private int mThreshold;
private static final int POLL_INTERVAL = 300;
mSensor = new DetectNoise();
private Handler mHandler = new Handler();

private Runnable mPollTask = new Runnable() {
       public void run() {

               double amp = mSensor.getAmplitude();
               //Log.i("Noise", "runnable mPollTask");
               updateDisplay("Monitoring Voice...", amp);

               if ((amp > mThreshold)) {
                   callForHelp(amp);
                   //Log.i("Noise", "==== onCreate ===");
               }// Runnable(mPollTask) will again execute after POLL_INTERVAL
               mHandler.postDelayed(mPollTask, POLL_INTERVAL); }

问题在于任何声音都会被激活。我希望仅在声音持续约5或7秒时才激活它。

有谁能够帮助我？非常感谢你的一切

问题来源：Stack Overflow