音频录制出现异常

Question

我正在创建一个录制应用程序。我需要录制音频并将其存储在SD卡中。但是，当我尝试运行它运行良好的应用程序，但是当我按下停止按钮，它显示消息“不幸的是你的应用程序已经停止”
这里是logcat的

enter code here 
08-01 12:09:18.331: E/SoundRecordingActivity(5611): sdcard access error 
08-01 12:09:21.043: D/AndroidRuntime(5611): Shutting down VM 
08-01 12:09:21.043: W/dalvikvm(5611): threadid=1: thread exiting with uncaught exception (group=0x2c3381f8) 
08-01 12:09:21.043: E/AndroidRuntime(5611): FATAL EXCEPTION: main 
08-01 12:09:21.043: E/AndroidRuntime(5611): java.lang.NullPointerException 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at com.blitze.recordingapp.SoundRecordingActivity$2.onClick(SoundRecordingActivity.java:110) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.view.View.performClick(View.java:3511) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.view.View$PerformClick.run(View.java:14115) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.os.Handler.handleCallback(Handler.java:605) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.os.Handler.dispatchMessage(Handler.java:92) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.os.Looper.loop(Looper.java:137) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
08-01 12:09:21.043: E/AndroidRuntime(5611):  at dalvik.system.NativeStart.main(Native Method) 
08-01 12:09:23.759: W/System.err(5611): java.lang.Throwable: stack dump 
08-01 12:09:23.759: W/System.err(5611):  at java.lang.Thread.dumpStack(Thread.java:496) 
08-01 12:09:23.759: W/System.err(5611):  at android.os.Process.killProcess(Process.java:725) 
08-01 12:09:23.759: W/System.err(5611):  at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:82) 
08-01 12:09:23.759: W/System.err(5611):  at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693) 
08-01 12:09:23.759: W/System.err(5611):  at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690) 
08-01 12:09:23.759: W/System.err(5611):  at dalvik.system.NativeStart.main(Native Method) 

这里是我的代码

startButton.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      startButton.setEnabled(false); 
      stopButton.setEnabled(true); 

      File sampleDir = Environment.getExternalStorageDirectory(); 
      try { 
       audiofile = File.createTempFile("sound", ".3gp", sampleDir); 

      recorder = new MediaRecorder(); 
      recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
      recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
      recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
      recorder.setOutputFile(audiofile.getAbsolutePath()); 
      recorder.prepare(); 
      recorder.start(); 




      } catch (IOException e) { 
       Log.e(TAG, "sdcard access error"); 
       return; 
      } 



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

     public void onClick(View v) { 
      startButton.setEnabled(true); 
      stopButton.setEnabled(false); 
      recorder.stop(); 
      recorder.release(); 

      //counter.cancel(); 
      addRecordingToMediaLibrary(); 

     } 
    }); 

protected void addRecordingToMediaLibrary() { 
    ContentValues values = new ContentValues(4); 
    long current = System.currentTimeMillis(); 
    values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName()); 
    values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current/1000)); 
    values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp"); 
    values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath()); 
    ContentResolver contentResolver = getContentResolver(); 

    Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
    Uri newUri = contentResolver.insert(base, values); 

    sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri)); 
    Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show(); 
} 

}

我将SD卡连接到手机。 我不明白是什么问题。给我任何提示或参考。
谢谢。

Answer 1

你需要看看行号110这是在你的OnClick功能的线。您将引用诸如“recorder.stop（）”之类的东西，并且录音机此时将为NULL。

看起来您需要将您在启动函数中创建的记录器对象的实例传递给停止函数。