title: AudioRecord - empty buffer
body: <p>I' m trying to record some audio using AudioRecord class. Here is my code: </p>
  
  <pre><code>    int audioSource = AudioSource.MIC;
      int sampleRateInHz = 44100;
      int channelConfig = AudioFormat.CHANNEL_IN_MONO;
      int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
      int bufferSizeInShorts = 44100;
      int bufferSizeInBytes = 2*bufferSizeInShorts;
  
      short Data[] = new short[bufferSizeInShorts];
      Thread recordingThread;
  
      AudioRecord audioRecorder = new AudioRecord(audioSource,
                                                  sampleRateInHz,
                                                  channelConfig,
                                                  audioFormat,
                                                  bufferSizeInBytes);
  
          @Override
          protected void onCreate(Bundle savedInstanceState) {
                  super.onCreate(savedInstanceState);
                  setContentView(R.layout.activity_main);
          }
  
          @Override
          public boolean onCreateOptionsMenu(Menu menu) {
                  getMenuInflater().inflate(R.menu.activity_main, menu);
                  return true;
          }
  
          public void startRecording(View arg0) {
                  audioRecorder.startRecording();
                  recordingThread = new Thread(new Runnable() {
                      public void run() {
                          while (Data[bufferSizeInShorts-1] == 0)
                                  audioRecorder.read(Data, 0, bufferSizeInShorts);
                      }
                  });
                  audioRecorder.stop();
          }
  </code></pre>
  
  <p>Unfortunately my short array is empty after the recording is over. May I kindly ask you to help me figure out what's wrong?</p>