从图库Orientation中选择的Android图像始终为0：Exif TAG

Question

When I pick an image from gallery to set it on my imageview in android application then I see that it comes inverted by 180 or 270 or 90 degress .
So to check/solve this I used EXIF orientations, but it always gives me "0".

I am not able to get what is the problem.

code:

Uri selectedImageUri = data.getData();

                    absolutePath = selectedImageUri.getPath();

                    exifMedia = new ExifInterface(absolutePath);
                    String exifOrint = exifMedia.getAttribute(ExifInterface.TAG_ORIENTATION);

                    exifOrientation = Integer.parseInt(exifOrint);

                    System.out.println("Orientation Tag is:"+exifOrientation);

                    /** Convert URI into byte */
                    ContentResolver cr = getBaseContext()
                    .getContentResolver();
                    InputStream inputStream = cr
                    .openInputStream(selectedImageUri);
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

                    rotatedBMP = getResizedBitmapImage(
                            bitmap, 100, 100,exifOrientation);

                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    rotatedBMP.compress(Bitmap.CompressFormat.PNG, 100,
                            stream);
                    byteArray = stream.toByteArray();
                    mimProfileImageBrowse.setImageBitmap(rotatedBMP);

method:

public  Bitmap getResizedBitmapImage(Bitmap bm, int newHeight, int newWidth, int exifOrientation) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        /**
         *  create a matrix for the manipulation
         */

        Matrix matrix = new Matrix();
        /**
         *  resize the bit map
         */


        /*

         1 = Horizontal (normal) 
2 = Mirror horizontal 
3 = Rotate 180 
4 = Mirror vertical 
5 = Mirror horizontal and rotate 270 CW 
6 = Rotate 90 CW 
7 = Mirror horizontal and rotate 90 CW 
8 = Rotate 270 CW

         */


        switch (exifOrientation) {
        case ExifInterface.ORIENTATION_ROTATE_270:

            rotate = 270;

            break;


        case ExifInterface.ORIENTATION_ROTATE_180:

            rotate = 180;


            break;

        case ExifInterface.ORIENTATION_ROTATE_90:

            rotate = 90;

            break;

        case ExifInterface.ORIENTATION_TRANSPOSE:

            rotate = 45;

            break;

        default:
            break;
        }


        matrix.postScale(scaleWidth, scaleHeight);
        matrix.postRotate(rotate);

        /**
         * recreate the new Bitmap
         */
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
        resizedBitmap = Bitmap.createScaledBitmap(bm, 65, 65, true);

        return resizedBitmap;

    }

Please help. Also matrix.postROTATE is not rotating the bitmaps. I dont know why.

Thanks

Answer 1

After you get Uri of selected Image call the below functions using this methods,
Like this,

Uri selectedImageUri = data.getData();
Bitmap bitmap = scaleImage(this,selectedImageUri);

The two functions to include in your activity are,

 public static Bitmap scaleImage(Context context, Uri photoUri) throws IOException {
        InputStream is = context.getContentResolver().openInputStream(photoUri);
        BitmapFactory.Options dbo = new BitmapFactory.Options();
        dbo.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(is, null, dbo);
        is.close();

        int rotatedWidth, rotatedHeight;
        int orientation = getOrientation(context, photoUri);

        if (orientation == 90 || orientation == 270) {
            rotatedWidth = dbo.outHeight;
            rotatedHeight = dbo.outWidth;
        } else {
            rotatedWidth = dbo.outWidth;
            rotatedHeight = dbo.outHeight;
        }

        Bitmap srcBitmap;
        is = context.getContentResolver().openInputStream(photoUri);
        if (rotatedWidth > MAX_IMAGE_DIMENSION || rotatedHeight > MAX_IMAGE_DIMENSION) {
            float widthRatio = ((float) rotatedWidth) / ((float) MAX_IMAGE_DIMENSION);
            float heightRatio = ((float) rotatedHeight) / ((float) MAX_IMAGE_DIMENSION);
            float maxRatio = Math.max(widthRatio, heightRatio);

            // Create the bitmap from file
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = (int) maxRatio;
            srcBitmap = BitmapFactory.decodeStream(is, null, options);
        } else {
            srcBitmap = BitmapFactory.decodeStream(is);
        }
        is.close();

        /*
         * if the orientation is not 0 (or -1, which means we don't know), we
         * have to do a rotation.
         */
        if (orientation > 0) {
            Matrix matrix = new Matrix();
            matrix.postRotate(orientation);

            srcBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(),
                    srcBitmap.getHeight(), matrix, true);
        }

        String type = context.getContentResolver().getType(photoUri);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (type.equals("image/png")) {
            srcBitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
        } else if (type.equals("image/jpg") || type.equals("image/jpeg")) {
            srcBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        }
        byte[] bMapArray = baos.toByteArray();
        baos.close();
        return BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
    }

    public static int getOrientation(Context context, Uri photoUri) {
        /* it's on the external media. */
        Cursor cursor = context.getContentResolver().query(photoUri,
                new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);

        if (cursor.getCount() != 1) {
            return -1;
        }

        cursor.moveToFirst();
        return cursor.getInt(0);
    }

To get Uri from File use this :

public static Uri getImageContentUri(Context context, File imageFile) {
        String filePath = imageFile.getAbsolutePath();
        Cursor cursor = context.getContentResolver().query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                new String[] { MediaStore.Images.Media._ID },
                MediaStore.Images.Media.DATA + "=? ",
                new String[] { filePath }, null);
        if (cursor != null && cursor.moveToFirst()) {
            int id = cursor.getInt(cursor
                    .getColumnIndex(MediaStore.MediaColumns._ID));
            Uri baseUri = Uri.parse("content://media/external/images/media");
            return Uri.withAppendedPath(baseUri, "" + id);
        } else {
            if (imageFile.exists()) {
                ContentValues values = new ContentValues();
                values.put(MediaStore.Images.Media.DATA, filePath);
                return context.getContentResolver().insert(
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            } else {
                return null;
            }
        }
    }

---

Q. Can you plz tell me what is "MAX_IMAGE_DIMENSION"? – Dhrupal Mar 13 '13 A. its based on your imageview size or the image size what you want to show.. whatever it is 60X60 then 60, 100X100 then 100 @Dhrupal

Answer 2

I guess you should not use " selectedImageUri.getPath() " to get the path since it does not really return the image file path. Instead you should use ContentResolver to query the value of MediaStore.Images.ImageColumns.DATA which is the actual path of the image.

Actually if you only want to get the orientation, you don't have to get that from the Exif, simply query the value of MediaStore.Images.ImageColumns.ORIENTATION can give you that.

Answer 3

it has been long time since questioning. but i countered with same problem, and solved this. when you put file path into contructor of exifInterface, use real path, like "/storage/sdcard0/DCIM/Camera/blahbalh.jpg", not using something like /content:/media/external/images/media/blah, whiich gives always 0 info. hope somebody will be helped. regrads.

Oops. below one is same approach. and here is more. use this.

/**
 * @ref http://stackoverflow.com/questions/3401579/get-filename-and-path-from-uri-from-mediastore
 * @param contentUri
 * @return
 */
public String getRealPathFromURI(Uri contentUri) {
    String[] proj = { MediaStore.Images.Media.DATA };
    Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

Answer 4

try below code :-

ExifInterface exif = new ExifInterface(filename);  
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);  
Bitmap bmRotated = rotateBitmap(bitmap, orientation); 

call below method:-

public static Bitmap rotateBitmap(Bitmap bitmap, int orientation) {

    try{
        Matrix matrix = new Matrix();
        switch (orientation) {
            case ExifInterface.ORIENTATION_NORMAL:
                return bitmap;
            case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
                matrix.setScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                matrix.setRotate(180);
                break;
            case ExifInterface.ORIENTATION_FLIP_VERTICAL:
                matrix.setRotate(180);
                matrix.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_TRANSPOSE:
                matrix.setRotate(90);
                matrix.postScale(-1, 1);
                break;
           case ExifInterface.ORIENTATION_ROTATE_90:
               matrix.setRotate(90);
               break;
           case ExifInterface.ORIENTATION_TRANSVERSE:
               matrix.setRotate(-90);
               matrix.postScale(-1, 1);
               break;
           case ExifInterface.ORIENTATION_ROTATE_270:
               matrix.setRotate(-90);
               break;
           default:
               return bitmap;
        }
        try {
            Bitmap bmRotated = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            bitmap.recycle();
            return bmRotated;
        }
        catch (OutOfMemoryError e) {
            e.printStackTrace();
            return null;
        }
    }
    catch (IOException e) {
        e.printStackTrace();
        return null;
    }
    return bitmap;
}

Answer 5

You should use getRealPathFromURI function:

public static String getRealPathFromURI(Context context, Uri uri,
            String data) {

    String[] largeFileProjection = { MediaStore.Images.ImageColumns._ID,
            MediaStore.Images.ImageColumns.DATA };

    String largeFileSort = MediaStore.Images.ImageColumns._ID + " DESC";
    Cursor myCursor = context.getContentResolver().query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            largeFileProjection, null, null, largeFileSort);
    String largeImagePath = "";
    try {
        myCursor.moveToFirst();
        largeImagePath = myCursor
                .getString(myCursor
                        .getColumnIndexOrThrow(MediaStore.Images.ImageColumns.DATA));
    } finally {
        myCursor.close();
    }

    return largeImagePath;
}

Answer 6

I couldn't get either the cursor or Exif interface method to work for me. I wasn't able to get reliable rotation numbers for both front and back cameras on Samsung.

For those looking for a solution which works across both front and back cameras for Samsung and other major manufacturers, this answer by nvhausid is awesome:

https://stackoverflow.com/a/18915443/6080472

For those who don't want to click through, the relevant magic is to use the CameraInfo rather then relying on EXIF.

Bitmap realImage = BitmapFactory.decodeByteArray(data, 0, data.length);
android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(mCurrentCameraId, info);
Bitmap bitmap = rotate(realImage, info.orientation);

Full code in the link.

Answer 7

When image is captured, it stores an exif data as information about rotation type (portrait - landscape). So the only thing you need to check is the exif data:

ExifInterface exifData = new ExifInterface(uri);
        int orientation = exifData.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
        Matrix matrix;
        switch (orientation) {
        case 6:
             matrix = new Matrix();
            matrix.postRotate(90);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        case 3:
             matrix = new Matrix();
            matrix.postRotate(180);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        case 8:
            matrix = new Matrix();
            matrix.postRotate(270);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        default:
            break;

Answer 8

Have you already checked if you had set Write and Read permissions in your manifest? because if you did not set them you cant access to exif data of your bitmap, i'm talking about android M. This is the snippet to rotate a bitmap based on its exif dada.

public static Bitmap rotateBitmap(String filePath, Bitmap bitmap) {
    ExifInterface exif;
    try {
        exif = new ExifInterface(filePath);

        int orientation = exif.getAttributeInt(
                ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
        Log.d("EXIF", "Exif: " + orientation);
        Matrix matrix = new Matrix();
        if (orientation == 6) {
            matrix.postRotate(90);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 3) {
            matrix.postRotate(180);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 8) {
            matrix.postRotate(270);
            Log.d("EXIF", "Exif: " + orientation);
        }
        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }


}