Android AudioRecord初始化失败

Question

我正在为Android创建应用程序，听电话。问题是初始化失败。

我的日志：

E/AudioRecord﹕ Could not get audio input for record source 3 
E/AudioRecord-JNI﹕ Error creating AudioRecord instance: initialization check failed. 
E/android.media.AudioRecord﹕ Error code -20 when initializing native AudioRecord object. 

我的代码：

public AudioRecord recorder; 

private int sampleRate = 16000; 
private int channelConfig = AudioFormat.CHANNEL_IN_MONO; 
private int audioFormat = AudioFormat.ENCODING_PCM_16BIT; 
int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat); 

recorder = new AudioRecord(MediaRecorder.AudioSource.VOICE_DOWNLINK, sampleRate, channelConfig, audioFormat, minBufSize * 10); 
recorder.startRecording(); 

编辑： 我只想下行

Answer 1

，您应该使用AudioRecord的MediaRecorder instade， 听到的是备案一例音频并保存在您的SD卡中。

MediaRecorder myAudioRecorder; 
    outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/recording.3gp"; 
    myAudioRecorder=new MediaRecorder(); 
    myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
    myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); 
    myAudioRecorder.setOutputFile(outputFile); 

你可以开始录制按钮点击事件中使用下面的代码

  try { 
       myAudioRecorder.prepare(); 
       myAudioRecorder.start(); 
      } 

      catch (IllegalStateException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      }