Xoay ảnh Image

public static Bitmap getRotateBitmap(File imageFile) throws IOException {
        InputStream inputStream = new FileInputStream(imageFile);
        Bitmap bmpSource = BitmapFactory.decodeStream(inputStream);
        inputStream.close();

        ExifInterface ei = new ExifInterface(imageFile.getCanonicalPath());
        int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
        float angle = 0;
        switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                angle = 90;
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                angle = 180;
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                angle = 270;
                break;
            // etc.
        }
        Bitmap bmpRotate;
        if (angle == 0) {// do not change bitmap
            bmpRotate = bmpSource;
        } else {
            bmpRotate = rotateImage(bmpSource, angle);
            bmpSource.recycle();// free memory
        }

        return bmpRotate;
    }

    public static Bitmap rotateImage(Bitmap source, float angle) {
        Bitmap retVal;

        Matrix matrix = new Matrix();
        matrix.postRotate(angle);
        retVal = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);

        return retVal;
    }