如何在Android中使用audio api录制音频？

Question

我有一个LG电话与版本2.3.3。我需要在耳机插孔中连接麦克风，因为我想创建一个读取声音样本的应用程序。

如何以编程方式读取示例？

Answer 1

2）如何以编程方式读取样本？

，我知道，在Android中您可以使用此两类之一录制声音：

• MediaRecorder Class

  用于录制音频和视频。记录控制是基于一个简单的状态机

• AudioRecord class

  的AudioRecord类管理Java应用程序的音频资源记录从平台的音频输入硬件音频上。这是通过“拉动”（读取）来自AudioRecord对象的数据来实现的。应用程序负责使用以下三种方法之一及时轮询AudioRecord对象：read（byte []，int，int），read（short []，int，int）或read（ByteBuffer，int）。选择使用哪种方法将基于AudioRecord用户最方便的音频数据存储格式。

PS：按照上面这个链接来阅读和理解最适合您的需求的。

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1）你推荐哪麦克风？

正如我在放在你的问题的评论中提到，这个在这里得到off-topic上计算器，但出于完整性的目的：

• How do i use a external microphone with my Galaxy Nexus?

• Any success with external microphones for Android phones or tablets?

Answer 2

如果你确实想读取AudioSamples，我会建议指示您使用AudioRecord而不是MediaRecorder，因为它可以让您更好地控制AudioSamples ...为了您可以使用以下代码，AudioCapturer是我用于从AudioRecord对象获取样本的包装类.IAudioReceiver是一个接口，它具有处理音频数据的方法。

public class AudioCapturer implements Runnable { 

    private AudioRecord audioRecorder = null; 
    private int bufferSize; 
    private int samplePerSec = 16000; 
    private String LOG_TAG = "AudioCapturer"; 
    private Thread thread = null; 

    private boolean isRecording; 
    private static AudioCapturer audioCapturer; 

    private IAudioReceiver iAudioReceiver; 

    private AudioCapturer(IAudioReceiver audioReceiver) { 
     this.iAudioReceiver = audioReceiver; 
    } 

    public static AudioCapturer getInstance(IAudioReceiver audioReceiver) { 
     if (audioCapturer == null) { 
      audioCapturer = new AudioCapturer(audioReceiver); 
     } 
     return audioCapturer; 
    } 

    public void start() { 

     bufferSize = AudioRecord.getMinBufferSize(samplePerSec, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); 

     if (bufferSize != AudioRecord.ERROR_BAD_VALUE && bufferSize != AudioRecord.ERROR) { 

      audioRecorder = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, this.samplePerSec, AudioFormat.CHANNEL_IN_MONO, 
        AudioFormat.ENCODING_PCM_16BIT, this.bufferSize * 10); // bufferSize 
                      // 10x 

      if (audioRecorder != null && audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) { 
       Log.i(LOG_TAG, "Audio Recorder created"); 


       audioRecorder.startRecording(); 
       isRecording = true; 
       thread = new Thread(this); 
       thread.start(); 

      } else { 
       Log.e(LOG_TAG, "Unable to create AudioRecord instance"); 
      } 

     } else { 
      Log.e(LOG_TAG, "Unable to get minimum buffer size"); 
     } 
    } 

    public void stop() { 
     isRecording = false; 
     if (audioRecorder != null) { 
      if (audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) { 
       // System.out 
       // .println("Stopping the recorder inside AudioRecorder"); 
       audioRecorder.stop(); 
      } 
      if (audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) { 
       audioRecorder.release(); 
      } 
     } 
    } 

    public boolean isRecording() { 
     return (audioRecorder != null) ? (audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) : false; 
    } 

    @Override 
    public void run() { 
     android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); 
     while (isRecording && audioRecorder.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING) { 
      short[] tempBuf = new short[Constants.FRAME_SIZE/2]; 
      audioRecorder.read(tempBuf, 0, tempBuf.length);  
      iAudioReceiver.capturedAudioReceived(tempBuf, false); 
     } 
    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see java.lang.Object#finalize() 
    */ 
    @Override 
    protected void finalize() throws Throwable { 
     super.finalize(); 
     System.out.println("AudioCapturer finalizer"); 
     if (audioRecorder != null && audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) { 
      audioRecorder.stop(); 
      audioRecorder.release(); 
     } 
     audioRecorder = null; 
      iAudioReceiver = null; 
     thread = null; 
    } 

} 

现在你可以从主类，你计划使用这个类的对象，它会开始给你的音频采样你能处理他们的IAudioReceiver（类使用这些样本）内..

如果你还是想用MediaRecorder，this link能对你有用，