ANDROID.UF.MEDIARECORDER

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     public boolean onKeyDown(final int keyCode, final KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
             MediaRecorder mRecorder = new MediaRecorder();
 
             mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
             mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
             mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
 
             final File file = new File("test.raw");
             if (file.exists()) {
                 mRecorder.release();
             } else {
                 mRecorder.setOutputFile(file.getPath());
             }
 
             mRecorder.start();
             mRecorder.release();
             return true;
         }
         return super.onKeyDown(keyCode, event);
     }