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我正在为安卓开发一个录音应用程序。我面临的问题是我想知道正在播放的声音文件何时结束，我不知道如何检查。有setOnCompleteListenerMediaRecorder 类，但我正在使用 AudioRecorder 类，因为我也需要在录制时进行一些编辑，比如改变扬声器的频率和音高。以下是我的代码：

public class MainActivity extends Activity {

Integer[] freqset = {8000};
 private ArrayAdapter<Integer> adapter;

 Spinner spFrequency;
 Button startRec, stopRec, playBack;

 Boolean recording;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startRec = (Button)findViewById(R.id.startrec);
        stopRec = (Button)findViewById(R.id.stoprec);
        playBack = (Button)findViewById(R.id.playback);

        startRec.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                   Thread recordThread = new Thread(new Runnable(){

                        @Override
                        public void run() {
                         recording = true;
                         startRecord();
                        }

                       });

                       recordThread.start();

            }
        });
        stopRec.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                recording = false;

            }
        });
        playBack.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                  Log.i("Test","Play Record called");playRecord();


            }
        });

        spFrequency = (Spinner)findViewById(R.id.frequency);
        adapter = new ArrayAdapter<Integer>(this, android.R.layout.simple_spinner_item, freqset);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spFrequency.setAdapter(adapter);

    }

 private void startRecord(){

  File file = new File(Environment.getExternalStorageDirectory(), "test.pcm"); 
  int BytesPerElement = 2;
  int sampleFreq = (Integer)spFrequency.getSelectedItem();
    Log.e("Test","Start Recording"+sampleFreq);
  try {
   file.createNewFile();

   OutputStream outputStream = new FileOutputStream(file);
   BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
   DataOutputStream dataOutputStream = new DataOutputStream(bufferedOutputStream);

   int minBufferSize = AudioRecord.getMinBufferSize(sampleFreq, 
     AudioFormat.CHANNEL_IN_MONO, 
     AudioFormat.ENCODING_PCM_16BIT);
   Log.i("Test","Buffer Size is"+minBufferSize);

   short[] audioData = new short[minBufferSize];
   Log.i("Test","audioData initialized"+audioData);
   AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
     sampleFreq,
     AudioFormat.CHANNEL_IN_MONO,
     AudioFormat.ENCODING_PCM_16BIT,
     minBufferSize*BytesPerElement);
   Log.i("Test","audioRecord initialized"+audioRecord);

   audioRecord.startRecording();

   while(recording){
    int numberOfShort = audioRecord.read(audioData, 0, minBufferSize);
    for(int i = 0; i < numberOfShort; i++){
     dataOutputStream.writeShort(audioData[i]);
       Log.i("Test","Recording buzzz"+recording);

    }
   }
   Log.i("Test","Recording Value after stop"+recording);

   audioRecord.stop();
   dataOutputStream.close();

  } catch (IOException e) {
   e.printStackTrace();
   Log.e("Testing", "Esception Found");
  }

 }

 void playRecord(){

  File file = new File(Environment.getExternalStorageDirectory(), "test.pcm");

        int shortSizeInBytes = Short.SIZE/Byte.SIZE;

  int bufferSizeInBytes = (int)(file.length()/shortSizeInBytes);
  short[] audioData = new short[bufferSizeInBytes];

  try {
   InputStream inputStream = new FileInputStream(file);
   BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
   DataInputStream dataInputStream = new DataInputStream(bufferedInputStream);

   int i = 0;
   while(dataInputStream.available() > 0){
    audioData[i] = dataInputStream.readShort();
    i++;
   }

   dataInputStream.close();

   int sampleFreq = (Integer)spFrequency.getSelectedItem();
      Log.i("Test","Sab set hai");

   AudioTrack audioTrack = new AudioTrack(
     AudioManager.STREAM_MUSIC,
     sampleFreq,
     AudioFormat.CHANNEL_CONFIGURATION_MONO,
     AudioFormat.ENCODING_PCM_16BIT,
     bufferSizeInBytes,
     AudioTrack.MODE_STREAM);
   Log.i("Test","will start play");
   audioTrack.play();
   audioTrack.write(audioData, 0, bufferSizeInBytes);

   Log.i("Test","does this print");
  } catch (FileNotFoundException e) {
      Log.i("Test","Ye wali exception");
   e.printStackTrace();
  } catch (IOException e) {
      Log.i("Test"," Ni Ye wali exception");          
   e.printStackTrace();
  }
 }}
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1 回答 1

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您可以使用AudioTrack.OnPlaybackPositionUpdateListener和AudioTrack.setNotificationMarkerPosition来确定音频播放是否完成：

AudioTrack audioTrack = new AudioTrack(
     AudioManager.STREAM_MUSIC,
     sampleFreq,
     AudioFormat.CHANNEL_CONFIGURATION_MONO,
     AudioFormat.ENCODING_PCM_16BIT,
     bufferSizeInBytes,
     AudioTrack.MODE_STREAM);

// set setNotificationMarkerPosition accouding audio length
 audioTrack.setNotificationMarkerPosition(bufferSizeInBytes);

// now add OnPlaybackPositionUpdateListener to audioTrack 
    audioTrack.setPlaybackPositionUpdateListener(
                             new AudioTrack.OnPlaybackPositionUpdateListener() {
        @Override
        public void onMarkerReached(AudioTrack track) {
            // do your work here....
        }
    });
于 2013-03-14T09:21:38.033 回答