버튼 클릭시 Android 오디오 녹음이 작동하지 않습니다.

Question

오디오 파일을 녹음하고 로컬 저장소에 저장하는 간단한 응용 프로그램을 만들려고합니다. 그러나 어떤 이유로 내 코드가 작동하지 않습니다! 내 코드에 문제가 있는지 궁금 하군! 실수를 찾기 위해 도와주세요!

public class demo extends Activity implements OnClickListener { 

    private static final String LOG_TAG = "AudioRecordTest"; 

    private static String mFileName = null; 

    private MediaRecorder mRecorder = null; 

    private MediaPlayer mPlayer = null; 

    boolean mStartPlaying, mStartRecording; 

    Button RecordButton, PlayButton; 

    private void onRecord(boolean start) { 
     if (start) { 
      startRecording(); 
     } else { 
      stopRecording(); 
     } 
    } 

    private void onPlay(boolean start) { 
     if (start) { 
      startPlaying(); 
     } else { 
      stopPlaying(); 
     } 
    } 

    private void startPlaying() { 
     mPlayer = new MediaPlayer(); 
     try { 
      mPlayer.setDataSource(mFileName); 
      mPlayer.prepare(); 
      mPlayer.start(); 
     } catch (IOException e) { 
      Log.e(LOG_TAG, "prepare() failed"); 
     } 
    } 

    private void stopPlaying() { 
     mPlayer.release(); 
     mPlayer = null; 
    } 

    private void startRecording() { 
     mRecorder = new MediaRecorder(); 
     mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
     mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     mRecorder.setOutputFile(mFileName); 
     mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 

     try { 
      mRecorder.prepare(); 
     } catch (IOException e) { 
      Log.e(LOG_TAG, "prepare() failed"); 
     } 

     mRecorder.start(); 
    } 

    private void stopRecording() { 
     mRecorder.stop(); 
     mRecorder.release(); 
     mRecorder = null; 
    } 

    public demo() { 
     mFileName = Environment.getExternalStorageDirectory().getAbsolutePath(); 
     mFileName += "my_Record"; 
    } 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_camera); 

     mStartRecording = true; 
     mStartPlaying = true; 

     RecordButton = (Button) findViewById(R.id.btRecord); 
     RecordButton.setOnClickListener(this); 
     PlayButton = (Button) findViewById(R.id.btPlay); 
     PlayButton.setOnClickListener(this); 
    } 

    @Override 
    public void onPause() { 
     super.onPause(); 
     if (mRecorder != null) { 
      mRecorder.release(); 
      mRecorder = null; 
     } 

     if (mPlayer != null) { 
      mPlayer.release(); 
      mPlayer = null; 
     } 
    } 

    @Override 
    public void onClick(View arg0) { 
     // TODO Auto-generated method stub 

     switch (arg0.getId()) { 

     case R.id.btRecord: { 

      onRecord(mStartRecording); 
      if (mStartRecording) { 
       RecordButton.setText("Stop recording"); 
      } else { 
       RecordButton.setText("Start recording"); 
      } 
      mStartRecording = !mStartRecording; 
      break; 
     } 
     case R.id.btPlay: { 

      onPlay(mStartPlaying); 
      if (mStartPlaying) { 
       PlayButton.setText("Stop playing"); 
      } else { 
       PlayButton.setText("Start playing"); 
      } 
      mStartPlaying = !mStartPlaying; 
      break; 
     } 
     } 
    } 
} 

로그 캣 출력 :

11-28 13:57:01.562: E/AndroidRuntime(2237): FATAL EXCEPTION: main 
11-28 13:57:01.562: E/AndroidRuntime(2237): Process: com.example.drishtikon, PID: 2237 
11-28 13:57:01.562: E/AndroidRuntime(2237): java.lang.IllegalStateException 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.media.MediaRecorder.start(Native Method) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at com.example.drishtikon.demo.startRecording(demo.java:78) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at com.example.drishtikon.demo.onRecord(demo.java:35) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at com.example.drishtikon.demo.onClick(demo.java:129) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.view.View.performClick(View.java:4424) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.view.View$PerformClick.run(View.java:18383) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.os.Handler.handleCallback(Handler.java:733) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.os.Handler.dispatchMessage(Handler.java:95) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.os.Looper.loop(Looper.java:137) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at android.app.ActivityThread.main(ActivityThread.java:4998) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at java.lang.reflect.Method.invoke(Method.java:515) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
11-28 13:57:01.562: E/AndroidRuntime(2237):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

은 파일 경로 (mFileName)이다;

demo() 메서드를 수정하십시오. 당신은 디렉토리 경로 및 과정의 파일 이름, 사이 슬래시 (/)를 추가해야

public demo() { 
     mFileName = Environment.getExternalStorageDirectory().getAbsolutePath(); 
     mFileName += "/my_Record"; 
    } 

:이처럼 보이게하는 방법입니다. OutputFormat.THREE_GPP을 사용하는 경우 "/my_Record.3gp"와 같은 파일 확장자를 추가하십시오.