RotationUtility.kt

RotationUtility.kt

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Matrix
import androidx.exifinterface.media.ExifInterface
import java.io.File

interface RotationUtility {
	fun autoRotate(file: File): Bitmap
}

class ImageRotationUtility : RotationUtility {

	override fun autoRotate(file: File): Bitmap {
		val bitmap = BitmapFactory.decodeFile(file.absolutePath)
		return try {
			val exif = ExifInterface(file)
			when (exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
					ExifInterface.ORIENTATION_NORMAL)) {
				ExifInterface.ORIENTATION_ROTATE_90 -> rotate(bitmap, 90)
				ExifInterface.ORIENTATION_ROTATE_180 -> rotate(bitmap, 180)
				ExifInterface.ORIENTATION_ROTATE_270 -> rotate(bitmap, 270)
				else -> bitmap
			}
		} catch (ex: Exception) {
			bitmap
		}
	}

	private fun rotate(bitmap: Bitmap, orientation: Int): Bitmap {
		val matrix = Matrix()
		matrix.postRotate(orientation.toFloat())
		return Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, matrix, true)
	}
}