將音頻記錄保存到文件對象

Question

我試圖將麥克風的音頻記錄保存到文件對象而不是文件。爲什麼？因爲我只需要保存記錄，而應用程序處於活動狀態。這是我嘗試使用從開發人員.android.com「音頻捕獲」教程

private Button b1; 
private Button b2; 

private ProgressBar bar; 

private MediaRecorder mRecorder = null; 
private MediaPlayer mPlayer = null; 

private boolean recording = false; 
private boolean playing = false; 

public AudioRecordDialog(Context context, final MainActivity main) { 
    super(context); 
    setTitle(R.string.setupSound); 
    setContentView(R.layout.audio_record_dialog_layout); 

    bar = (ProgressBar) findViewById(R.id.progressBar1); 
    bar.setAlpha(0); 

    b1 = (Button) findViewById(R.id.button1); 
    b1.setText(R.string.startButton); 
    b1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (recording) { 
       b1.setText(R.string.startButton); 
       recording = false; 
       bar.setAlpha(0); 
       if (mRecorder != null) { 
        mRecorder.stop(); 
        mRecorder.release(); 
       } 
       mRecorder = null; 
      } else { 
       b1.setText(R.string.stopButton); 
       recording = true; 
       bar.setAlpha(1); 

       mRecorder = new MediaRecorder(); 
       mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
       mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
       mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
       mRecorder.setOutputFile("record.3gp"); 

       try { 
        mRecorder.prepare(); 
       } catch (IOException e) { 
        Toast toast = Toast.makeText(getContext(), 
          "Failed Recording!", Toast.LENGTH_SHORT); 
        toast.show(); 
       } 

       mRecorder.start(); 
      } 
     } 
    }); 

    b2 = (Button) findViewById(R.id.button2); 
    b2.setText(R.string.playButton); 
    b2.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (playing) { 
       b2.setText(R.string.playButton); 
       playing = false; 
       if (mPlayer != null) 
        mPlayer.release(); 
       mPlayer = null; 
      } else { 
       b2.setText(R.string.pauseButton); 
       playing = true; 
       mPlayer = new MediaPlayer(); 
       try { 
        mPlayer.setDataSource("record.3gp"); 
        mPlayer.prepare(); 
        mPlayer.start(); 
       } catch (IOException e) { 
        Toast toast = Toast.makeText(getContext(), 
            "Failed Playing soundFile!", 
            Toast.LENGTH_SHORT); 
        toast.show(); 
       } 
      } 
     } 
    }); 

但它不工作，並在單擊記錄按鈕時崩潰。 這裏是logCat。

08-28 02:07:14.144: E/Trace(17588): error opening trace file: Permission denied (13) 
08-28 02:07:14.324: D/SensorManager(17588): caller of registerListener:17588,sensor type:3 
08-28 02:07:14.410: D/libEGL(17588): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so 
08-28 02:07:14.425: D/libEGL(17588): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so 
08-28 02:07:14.425: D/libEGL(17588): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so 
08-28 02:07:14.511: D/OpenGLRenderer(17588): Enabling debug mode 0 
08-28 02:07:17.785: E/MediaRecorder(17588): start called in an invalid state: 4 
08-28 02:07:17.785: D/AndroidRuntime(17588): Shutting down VM 
08-28 02:07:17.785: W/dalvikvm(17588): threadid=1: thread exiting with uncaught exception (group=0x40ddd2a0) 
08-28 02:07:17.793: E/AndroidRuntime(17588): FATAL EXCEPTION: main 
08-28 02:07:17.793: E/AndroidRuntime(17588): java.lang.IllegalStateException 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.media.MediaRecorder.start(Native Method) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at com.notfall.notruf.AudioRecordDialog$1.onClick(AudioRecordDialog.java:74) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.view.View.performClick(View.java:4106) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.view.View$PerformClick.run(View.java:17052) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.os.Handler.handleCallback(Handler.java:615) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.os.Handler.dispatchMessage(Handler.java:92) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.os.Looper.loop(Looper.java:137) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at android.app.ActivityThread.main(ActivityThread.java:5118) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at java.lang.reflect.Method.invokeNative(Native Method) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at java.lang.reflect.Method.invoke(Method.java:511) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 
08-28 02:07:17.793: E/AndroidRuntime(17588): at dalvik.system.NativeStart.main(Native Method) 
08-28 02:07:19.191: I/Process(17588): Sending signal. PID: 17588 SIG: 9 

它崩潰的

mRecorder.start(); 

Answer 1

我設法解決使用FileOutputStream保存和FileInputStream閱讀我的問題，

Answer 2

setOutputFormat()後，你應該叫setAudioEncoder()。