Android 第三次命名拍摄图像

我创建了一个基本的服务，每10秒钟从一台相机获取一次图像。这项服务运行得很好，但我尝试将图像文件命名为Imageyyydmm\u HHmmSS。在第二个文件之后，图像将获得相同的YYYYddmm_hhmms，从而覆盖第一个图像。我的错在哪里

public class CP extends Service
{
    Camera.PictureCallback mCall = new Camera.PictureCallback()
  {

     public void onPictureTaken(final byte[] data, Camera camera)
     {

         FileOutputStream outStream = null;
                try{

                    outStream = new FileOutputStream("/sdcard/Image"+tar+".jpg");
                    outStream.write(data);  outStream.close();


                    Log.i("CAM", data.length + " byte written: /sdcard/Image"+tar+".jpg");
                    camClose(sHolder);               


                 } catch (FileNotFoundException e){
                    Log.d("CAM", e.getMessage());
                } catch (IOException e){
                    Log.d("CAM", e.getMessage());
                }


     }
  };


    @Override
    public IBinder onBind(Intent intent) {

          return null;
    }

    public void camClose(SurfaceHolder sHolder) {


        if (null == mCamera)
            return;
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
        Log.i("CAM", " closed");
        }
}

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Tar从未更新到当前时间。在onPictureTaken中，尝试以下操作：

public void onPictureTaken(final byte[] data, Camera camera)
 {

     FileOutputStream outStream = null;
            try{

                Calendar cal = Calendar.getInstance();
                tar = (sdf.format(cal.getTime()));
                outStream = new FileOutputStream("/sdcard/Image"+tar+".jpg");
                outStream.write(data);  outStream.close();


                Log.i("CAM", data.length + " byte written: /sdcard/Image"+tar+".jpg");
                camClose(sHolder);               


             } catch (FileNotFoundException e){
                Log.d("CAM", e.getMessage());
            } catch (IOException e){
                Log.d("CAM", e.getMessage());
            }


 }

---

谢谢这就是我想要的。