decodeBitmap.kt

    private fun decodeFile(f: File, height: Int): Bitmap? {
        try {

            val options = BitmapFactory.Options()
            options.inJustDecodeBounds = true
            BitmapFactory.decodeStream(FileInputStream(f), null, options)

            // Width and height of the bitmap
            val bmpWidth = options.outWidth
            val bmpHeight = options.outHeight

            val requiredSize = height.coerceAtMost(bmpHeight)
            var widthTmp = bmpWidth
            var heightTmp = bmpHeight
            var scale = 1
            while (true) {
                if ((widthTmp / 2 < requiredSize) || heightTmp / 2 < requiredSize)
                    break
                widthTmp /= 2
                heightTmp /= 2
                scale *= 2
            }

            // decode
            val decodeOptions = BitmapFactory.Options()
            decodeOptions.inSampleSize = scale
            return BitmapFactory.decodeStream(FileInputStream(f), null, decodeOptions)
        } catch (e: Exception) {
            Log.e(TAG, "Error decoding bitmap", e)
        }
        return null
    }