Rotate bitmap on Android

android-rotate-bitmap.kt

fun rotateBitmap(bitmap: Bitmap, orientation: Int): Bitmap? {
    val matrix = Matrix()

    when (orientation) {
        ExifInterface.ORIENTATION_FLIP_HORIZONTAL -> matrix.setScale(-1F, 1F)
        ExifInterface.ORIENTATION_ROTATE_180 -> matrix.setRotate(180F)
        ExifInterface.ORIENTATION_FLIP_VERTICAL -> {
            matrix.setRotate(180F)
            matrix.postScale(-1F, 1F)
        }
        ExifInterface.ORIENTATION_TRANSPOSE -> {
            matrix.setRotate(90F)
            matrix.postScale(-1F, 1F)
        }
        ExifInterface.ORIENTATION_ROTATE_90 -> {
            matrix.setRotate(90F)
        }
        ExifInterface.ORIENTATION_TRANSVERSE -> {
            matrix.setRotate(-90F)
            matrix.postScale(-1F, 1F)
        }
        ExifInterface.ORIENTATION_ROTATE_270 -> {
            matrix.setRotate(-90F)
        }
        else -> return bitmap
    }

    return try {
        val rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, matrix, true)
        bitmap.recycle()
        rotatedBitmap
    } catch (e: Exception) {
        null
    }
}