对于使用肖像相机应用程序android拍摄的图像,EXIF方向标记值始终为0

Question

我有一个纵向模式的相机应用程序,它从前端和后端相机拍摄照片.我将图像保存在我的SD卡中并尝试找到相应的exif值,它总是给出0.但是我得到了预期的exif方向存储在设备中的其他图像的值(如下载的图片).

我怎样才能解决这个问题 ？谁能帮我吗 ？

这是用于保存图片和查找方向的代码

PictureCallback myPictureCallback_JPG = new PictureCallback() {

    @Override
    public void onPictureTaken(byte[] arg0, Camera arg1) {
        // TODO Auto-generated method stub


                try {
                    File APP_FILE_PATH = new File(Environment.getExternalStorageDirectory()
                            .getPath() + "/Myapp/");
                    if (!APP_FILE_PATH.exists()) {
                        APP_FILE_PATH.mkdirs();
                    }
                    File file = new File(APP_FILE_PATH, "image.jpg");

                    FileOutputStream fos = new FileOutputStream(file);
                    fos.write(arg0);
                    fos.close();
imageFileUri=Uri.fromfile(file);                           getApplicationContext().getContentResolver().notifyChange(
                          imageFileUri, null);
                sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
                            Uri.parse("file://"
                                    + Environment.getExternalStorageDirectory())));
                    ExifInterface exif = new ExifInterface(file.getAbsolutePath());
                    int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);



                } catch (Exception e) {

                }



    }
};

以下是surphace创建和更改函数的代码

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size optimalSize = getOptimalPreviewSize(sizes, width, height);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);

camera.setParameters(parameters);
camera.startPreview();
 startPreview();

}
 @Override
 public void surfaceCreated(SurfaceHolder holder) {


 try {

     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
          Camera.CameraInfo info=new Camera.CameraInfo();

          for (int i=0; i < Camera.getNumberOfCameras(); i++) {
            Camera.getCameraInfo(i, info);

            if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
              camera=Camera.open(i);
              defaultCameraId = i;
            }
          }
        }

        if (camera == null) {
          camera=Camera.open();
        }




        try {
            camera.setPreviewDisplay(surfaceHolder);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Camera.Parameters parameters = camera.getParameters();
        android.hardware.Camera.CameraInfo info =
                new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(defaultCameraId, info);
        int rotation = this.getWindowManager().getDefaultDisplay()
                .getRotation();
        if (Integer.parseInt(Build.VERSION.SDK) >= 8)
        {

             int degrees = 0;
             switch (rotation) {
                 case Surface.ROTATION_0: 
                     degrees = 0; break;
                 case Surface.ROTATION_90: 
                     degrees = 90; break;
                 case Surface.ROTATION_180: 
                     degrees = 180; break;
                 case Surface.ROTATION_270: 
                     degrees = 270; break;
             }
             int result;
             if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
                 result = (info.orientation + degrees) % 360;
                 result = (360 - result) % 360;  
             } else {  // back-facing
                 result = (info.orientation - degrees + 360) % 360;
             }
             camera.setDisplayOrientation(result);

        }
        else
        {
            parameters.set("orientation", "portrait");
        }


        camera.setParameters(parameters);



} catch (IllegalArgumentException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (SecurityException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} 


}
 private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
            final double ASPECT_TOLERANCE = 0.1;
            double targetRatio = (double) w / h;
            if (sizes == null) return null;

            Size optimalSize = null;
            double minDiff = Double.MAX_VALUE;

            int targetHeight = h;


            for (Size size : sizes) {
                double ratio = (double) size.width / size.height;
                if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }


            if (optimalSize == null) {
                minDiff = Double.MAX_VALUE;
                for (Size size : sizes) {
                    if (Math.abs(size.height - targetHeight) < minDiff) {
                        optimalSize = size;
                        minDiff = Math.abs(size.height - targetHeight);
                    }
                }
            }
            return optimalSize;
        }

Answer 1

我在三星设备上也遇到了同样的问题,后来我实现了ExifInterface并成功解决了.

在任何模式下,图像将被拍摄,它将始终仅以纵向模式存储,并且在以纵向模式拍摄时也会返回.以下代码我用来实现我的目标,我在后置摄像头实现,不确定从相机.

相机意图@

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
            startActivityForResult(intent, 1212);   

onActivityResult @

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

        if (requestCode == 1212) {
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
        Bitmap bitmap;
        //bitmap=GlobalMethods.decodeSampledBitmapFromResource(_path, 80, 80);
        bitmap=GlobalMethods.decodeFile(_path);
        if (bitmap == null) {
            imgMed.setImageBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.add_photo));
        } 
        else {
            imgMed.setImageBitmap(bitmap);
            imgMed.setScaleType(ScaleType.FIT_XY);

        }
    }
        }

decodeFile @

    public static Bitmap decodeFile(String path) {

          int orientation;

             try {

                 if(path==null){

                     return null;
                 }
                 // decode image size
                 BitmapFactory.Options o = new BitmapFactory.Options();
                 o.inJustDecodeBounds = true;

                 // Find the correct scale value. It should be the power of 2.
                 final int REQUIRED_SIZE = 70;
                 int width_tmp = o.outWidth, height_tmp = o.outHeight;
                 int scale = 4;
                 while (true) {
                     if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
                         break;
                     width_tmp /= 2;
                     height_tmp /= 2;
                     scale++;
                 }
                 // decode with inSampleSize
                 BitmapFactory.Options o2 = new BitmapFactory.Options();
                 o2.inSampleSize=scale;
                 Bitmap bm = BitmapFactory.decodeFile(path,o2);


                 Bitmap bitmap = bm;

                 ExifInterface exif = new ExifInterface(path);
                 orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
                 Log.e("orientation",""+orientation);
                 Matrix m=new Matrix();

                 if((orientation==3)){

                 m.postRotate(180);
                 m.postScale((float)bm.getWidth(), (float)bm.getHeight());

//               if(m.preRotate(90)){
                 Log.e("in orientation",""+orientation);

                 bitmap = Bitmap.createBitmap(bm, 0, 0,bm.getWidth(),bm.getHeight(), m, true);
                 return  bitmap;
                 }
                 else if(orientation==6){

                  m.postRotate(90);

                  Log.e("in orientation",""+orientation);

                  bitmap = Bitmap.createBitmap(bm, 0, 0,bm.getWidth(),bm.getHeight(), m, true);
                     return  bitmap;
                 }

                 else if(orientation==8){

                  m.postRotate(270);

                  Log.e("in orientation",""+orientation);

                  bitmap = Bitmap.createBitmap(bm, 0, 0,bm.getWidth(),bm.getHeight(), m, true);
                     return  bitmap;
                 }
                 return bitmap;
             }
             catch (Exception e) {
             }
             return null;
         }