떨림을 감지하려고 할 때 NullPointerException이 발생했습니다.

Question

흔들기를 감지하려고 할 때 응용 프로그램에서 NullPointerException이 발생합니다.

내 응용 프로그램에는 백그라운드에서 실행되는 서비스와 카메라의 cameraIntent() 메서드를 호출하는 액티비티가 있습니다.

public class Run1 extends Activity implements Shaker.Callback { 
public static final int MEDIA_TYPE_IMAGE = 1; 
public static final int MEDIA_TYPE_VIDEO = 2; 
public static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100; 
public static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200; 
private Uri fileUri; 
private static final String TAG = Shaker.class.getSimpleName(); 
final Handler handle = new Handler(); 
Shaker shaker; 
shakeCameraService shakecamera; 


public void miThread() { 
    Thread t = new Thread() { 
     public void run() { 
      handle.post(proceso); 
     } 
    }; 
    t.start(); 

} 

public final Runnable proceso = new Runnable() { 
    public void run() {   
     cameraIntent(); 


    } 
}; 



/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Log.e("ONCREATE RUN1 ", "ONCREATE RUN1"); 
    startService(new Intent(this, shakeCameraService.class));  

} 

public void cameraIntent() { 
    shaker = new Shaker(this, 5.0d, 500, this); 
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to 
                 // // save the image 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file 
                 // name 
    // start the image capture Intent 
    startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE); 


} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) { 
     if (resultCode == RESULT_OK) { 

      if (fileUri != null) { 
       Log.e(TAG, "Result ok"); 
       Log.e(TAG, "Image saved to:\n" + fileUri); 
       Log.e(TAG, "Image path:\n" + fileUri.getPath()); 
       // uri.getLastPathSegment() 
       // if store 
       // in folder 
      } 

     } else if (resultCode == RESULT_CANCELED) { 
      Log.e(TAG, "RESULT CANCELED"); 

     } else { 
      // Image capture failed, advise user 
     } 
    } 

} 

private static Uri getOutputMediaFileUri(int type) { 
    return Uri.fromFile(getOutputMediaFile(type)); 
} 

/** Create a File for saving an image or video */ 
private static File getOutputMediaFile(int type) { 
    // To be safe, you should check that the SDCard is mounted 
    // using Environment.getExternalStorageState() before doing this. 

    File mediaStorageDir = new File(
      Environment.getExternalStorageDirectory() + "/DCIM/Camera"); 
    // This location works best if you want the created images to be shared 
    // between applications and persist after your app has been uninstalled. 

    // Create the storage directory if it does not exist 
    if (!mediaStorageDir.exists()) { 
     if (!mediaStorageDir.mkdirs()) { 
      Log.d("ShakerCam", "failed to create directory"); 
      return null; 
     } 
    } 

    // Create a media file name 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss") 
      .format(new Date()); 
    File mediaFile; 
    if (type == MEDIA_TYPE_IMAGE) { 
     mediaFile = new File(mediaStorageDir.getPath() + File.separator 
       + "IMG_" + timeStamp + ".jpg"); 
    } else { 
     return null; 
    } 

    return mediaFile; 
} 

public void shakingStarted() { 
    miThread(); 

} 

public void shakingStopped() { 
    // TODO Auto-generated method stub 

} 
} 

이

public class shakeCameraService extends Service implements Shaker.Callback { 
Run1 run1; 
Shaker shaker =null; 


@Override 
public void onCreate() { 
    super.onCreate(); 
    shaker = new Shaker(this, 5.0d, 500, this); 
    Log.e("ONCREATE SERVICE", "ONCREATE SERVICE"); 

} 

@Override 
public void onStart(Intent intent, int startId) { 
    shaker = new Shaker(this, 5.0d, 500, this); 
    Log.e("onStart Servicio ", "onStart Servicio "); 
} 

@Override 
public void shakingStarted() { 
    shaker = new Shaker(this, 5.0d, 500, this); 
    Log.e("shakingstrated SERVICE", "shakingstrated SERVICE"); 
    run1.cameraIntent(); 

} 


@Override 
public void shakingStopped() { 
    // TODO Auto-generated method stub 

} 

@Override 
public IBinder onBind(Intent arg0) { 
    // TODO Auto-generated method stub 
    return null; 
} 



} 

오류가 그때 내게 로그 캣 내 서비스입니다! 그리고 코는 정말로이 문제를 해결합니다!

04-19 23:26:30.788: ERROR/ONCREATE RUN1(356): ONCREATE RUN1 
04-19 23:26:30.808: DEBUG/onCReate RUN1(356): antes de llamar a shakingstrated 
04-19 23:26:30.808: DEBUG/AndroidRuntime(356): Shutting down VM 
04-19 23:26:30.808: WARN/dalvikvm(356): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 
04-19 23:26:30.822: ERROR/AndroidRuntime(356): Uncaught handler: thread main exiting due to uncaught exception 
04-19 23:26:30.842: ERROR/AndroidRuntime(356): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sebastian.shakeCam/com.sebastian.shakeCam.Run1}: java.lang.NullPointerException 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.os.Looper.loop(Looper.java:123) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at java.lang.reflect.Method.invoke(Method.java:521) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at dalvik.system.NativeStart.main(Native Method) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356): Caused by: java.lang.NullPointerException 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at com.sebastian.shakeCam.Run1.onCreate(Run1.java:57) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
04-19 23:26:30.842: ERROR/AndroidRuntime(356):  ... 11 more 

Answer 1

방법은 Service입니다.

대신 onStartCommand (...)을 구현해야합니다. onStartCommand에 대한 문서를 참조하십시오.

그래도 문제가 해결 될지 확신하지 못합니다.