The method code instance that gets DB value when Android recording _android

Reference article Android Real-time fetch volume decibel value detailed: http://www.jb51.net/article/64806.htm

public class Mediarecorderdemo {private final String TAG = "Mediarecord"; 
  Private Mediarecorder Mmediarecorder; 
  public static final int max_length = 1000 * 60 * 10;//maximum recording length 1000*60*10; 
 
  Private String FilePath; 
  Public Mediarecorderdemo () {This.filepath = "/dev/null"; 
  Public Mediarecorderdemo (file file) {This.filepath = File.getabsolutepath (); 
  Private long starttime; 
 
  Private long Endtime; /** * Start recording using AMR format * * Audio file * @return/public void Startrecord () {//Start recording/*①ini 
    Tial: Instantiate Mediarecorder Object */if (Mmediarecorder = null) Mmediarecorder = new Mediarecorder (); try {/*②setaudiosource/setvediosource */Mmediarecorder.setaudiosource (MediaRecorder.AudioSource.MIC);//Set Set the microphone/*② the encoding of the audio file: Aac/amr_nb/amr_mb/default (waveform) Sampling/Mmediarecorder.setoutputformat (MEDIARECORDER.OUTP 
            Utformat.default); /* *② format of output file: Three_gpp/mpeg-4/raw_amr/default THREE_GPP (3gp format *, H263 video/arm audio encoding), MPEG-4, RAW_AMR (audio only supported and audio coding required for AMR_NB)/Mmediarecord 
 
      Er.setaudioencoder (MediaRecorder.AudioEncoder.AMR_NB); 
      /*③ Preparation * * * Mmediarecorder.setoutputfile (FilePath); 
      Mmediarecorder.setmaxduration (max_length); 
      Mmediarecorder.prepare (); 
      /*④ Start * * Mmediarecorder.start (); 
      Audiorecord Audiorecord. 
      /* Get start time * */starttime = System.currenttimemillis (); 
      Updatemicstatus (); 
    LOG.I ("Action_start", "starttime" + starttime); 
              catch (IllegalStateException e) {log.i (TAG, "Call Startamr (File mrecaudiofile) failed!" 
    + e.getmessage ()); 
              catch (IOException e) {log.i (TAG, "Call Startamr (File mrecaudiofile) failed!" 
    + e.getmessage ()); 
    }/** * Stop recording */public long Stoprecord () {if (Mmediarecorder = null) return 0L; Endtime = System.currenttImemillis (); 
    LOG.I ("Action_end", "Endtime" + endtime); 
    Mmediarecorder.stop (); 
    Mmediarecorder.reset (); 
    Mmediarecorder.release (); 
    Mmediarecorder = null; 
    LOG.I ("Action_length", "Time" + (endtime-starttime)); 
  return endtime-starttime; 
  Private final Handler Mhandler = new Handler (); 
    Private Runnable Mupdatemicstatustimer = new Runnable () {public void run () {updatemicstatus (); 
 
  } 
  }; 
  /** * Update Microphone status */private int BASE = 1; private int space = 100;//interval sampling time private void Updatemicstatus () {if (Mmediarecorder!= null) {double R 
      Atio = (double) mmediarecorder.getmaxamplitude ()/base; 
      Double db = 0;//db if (ratio > 1) db = * MATH.LOG10 (ratio); 
      LOG.D (TAG, "decibel value:" +db); 
    Mhandler.postdelayed (Mupdatemicstatustimer, space); } 
  } 
}