Android: Bitmaps loaded from gallery are rotated in ImageView

Question

So, as an example...

First you need to create an ExifInterface:

ExifInterface exif = new ExifInterface(filename);

You can then grab the orientation of the image:

orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);

Here's what the orientation values mean: http://sylvana.net/jpegcrop/exif_orientation.html

So, the most important values are 3, 6 and 8. If the orientation is ExifInterface.ORIENTATION_ROTATE_90 (which is 6), for example, you can rotate the image like this:

Matrix matrix = new Matrix();
matrix.postRotate(90);
rotatedBitmap = Bitmap.createBitmap(sourceBitmap, 0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight(), matrix, true);

That's just a quick example, though. I'm sure there are other ways of performing the actual rotation. But you will find those on StackOverflow as well.

This is a full solution (found in the Hackbook example from the Facebook SDK). It has the advantage of not needing access to the file itself. This is extremely useful if you are loading an image from the content resolver thingy (e.g. if your app is responding to a share-photo intent).

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);
}

And then you can get a rotated Bitmap as follows. This code also scales down the image (badly unfortunately) to MAX_IMAGE_DIMENSION. Otherwise you may run out of memory.

public static Bitmap getCorrectlyOrientedImage(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);
    }

    return srcBitmap;
}

Solved it in my case with this code using help of this post:

            Bitmap myBitmap = getBitmap(imgFile.getAbsolutePath());

            try {
                ExifInterface exif = new ExifInterface(imgFile.getAbsolutePath());
                int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
                Log.d("EXIF", "Exif: " + orientation);
                Matrix matrix = new Matrix();
                if (orientation == 6) {
                    matrix.postRotate(90);
                }
                else if (orientation == 3) {
                    matrix.postRotate(180);
                }
                else if (orientation == 8) {
                    matrix.postRotate(270);
                }
                myBitmap = Bitmap.createBitmap(myBitmap, 0, 0, myBitmap.getWidth(), myBitmap.getHeight(), matrix, true); // rotating bitmap
            }
            catch (Exception e) {

            }
            ImageView img = (ImageView) findViewById(R.id.imgTakingPic);
            img.setImageBitmap(myBitmap);

Hope it saves someone's time!

Use a Utility to do the Heavy Lifting.

9re created a simple utility to handle the heavy lifting of dealing with EXIF data and rotating images to their correct orientation.

You can find the utility code here: https://gist.github.com/9re/1990019

Simply download this, add it to your project's src directory and use ExifUtil.rotateBitmap() to get the correct orientation, like so:

String imagePath = photoFile.getAbsolutePath();             // photoFile is a File class.
Bitmap myBitmap  = BitmapFactory.decodeFile(imagePath);

Bitmap orientedBitmap = ExifUtil.rotateBitmap(imagePath, myBitmap);

Have you looked at the EXIF data of the images? It may know the orientation of the camera when the picture was taken.

its because gallery correct displaying rotated images but not ImageView look at here:

                    myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),optionss);
                    ExifInterface exif = new ExifInterface(selectedImagePath);
                    int rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
                    int rotationInDegrees = exifToDegrees(rotation);
                    deg = rotationInDegrees;
                    Matrix matrix = new Matrix();
                    if (rotation != 0f) {
                        matrix.preRotate(rotationInDegrees);
                        myBitmap = Bitmap.createBitmap(myBitmap, 0, 0, myBitmap.getWidth(), myBitmap.getHeight(), matrix, true);
                    }

and you need this:

private static int exifToDegrees(int exifOrientation) {        
    if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) { return 90; } 
    else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {  return 180; } 
    else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {  return 270; }            
    return 0;    
} 

Kotlin code:

if (file.exists()){
    val bitmap = BitmapFactory.decodeFile(file.absolutePath)

    val exif = ExifInterface(file.absoluteFile.toString())
    val orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL)
    val matrix = Matrix()

    when(orientation){
        ExifInterface.ORIENTATION_ROTATE_90 -> matrix.postRotate(90F)
        ExifInterface.ORIENTATION_ROTATE_180 -> matrix.postRotate(180F)
        ExifInterface.ORIENTATION_ROTATE_270 -> matrix.postRotate(270F)
    }

    val rotatedBitmap = Bitmap.createBitmap(bitmap, 0,0 , bitmap.width, bitmap.height, matrix, true)
    bitmap.recycle()
    iv_capture.setImageBitmap(rotatedBitmap)
}