Android getting an image from gallery comes rotated

Question

I am trying to let users select a profile picture from gallery. My issue is that some pictures come as rotated to the right.

I start the image picker like so:

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Answer 1

Here is the ExifInterface approach written in Kotlin:

fun modifyOrientation(bitmap: Bitmap, image_absolute_path: String): Bitmap {
    val ei = ExifInterface(image_absolute_path)
    val orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL)
    return when (orientation) {
        ExifInterface.ORIENTATION_ROTATE_90 -> rotateImage(bitmap, 90f)
        ExifInterface.ORIENTATION_ROTATE_180 -> rotateImage(bitmap, 180f)
        ExifInterface.ORIENTATION_ROTATE_270 -> rotateImage(bitmap, 270f)
        ExifInterface.ORIENTATION_FLIP_HORIZONTAL -> flipImage(bitmap, true, false)
        ExifInterface.ORIENTATION_FLIP_VERTICAL -> flipImage(bitmap, false, true)
        else -> bitmap
    }
}

private fun rotateImage(bitmap: Bitmap, degrees: Float): Bitmap {
    val matrix = Matrix()
    matrix.postRotate(degrees)
    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, matrix, true)
}

private fun flipImage(bitmap: Bitmap, horizontal: Boolean, vertical: Boolean): Bitmap {
    val matrix = Matrix()
    matrix.preScale((if (horizontal) -1 else 1).toFloat(), (if (vertical) -1 else 1).toFloat())
    return Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, matrix, true)
}