How to convert byte array to image [kotlin]

Question

I want to convert byte array to image and show it in image view, but not sure how to do it. Can someone guide me please

I use this function to convert bitmap to byte array

private fun BitmapToByteArray(): ByteArray
    {
        val stream = ByteArrayOutputStream()
        btm1!!.compress(Bitmap.CompressFormat.PNG, 100, stream)
        val bitmapdata: ByteArray = stream.toByteArray()
        return bitmapdata
    }

score 1 · Answer 1 · answered Jul 12 '22 at 15:07

These extension functions are working

fun Bitmap.toByteArray(): ByteArray {
  val stream = ByteArrayOutputStream()
  this.compress(Bitmap.CompressFormat.PNG, 100, stream)
  return stream.toByteArray()
}

fun ByteArray.toBitmap(): Bitmap {
  return BitmapFactory.decodeByteArray(this, 0, this.size)
}

score 0 · Accepted Answer · answered Apr 23 '21 at 03:51

0

Try with this :

 fun byteArrayToBitmap(data: ByteArray): Bitmap {
    return BitmapFactory.decodeByteArray(data, 0, data.size)
}

answered Apr 23 '21 at 03:51

Shay Kin

2,539
3
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val x = final_str?.toByteArray() byteArrayToBitmap(x) fun byteArrayToBitmap(x: ByteArray): Bitmap { return BitmapFactory.decodeByteArray(x, 0, x.size) } is this correct ? – leafrain-Legit Apr 23 '21 at 04:05
final_str is a ByteArrayOutputStream ? – Shay Kin Apr 23 '21 at 04:09
final_str is the string that convert from byte array. so I turn it back into byte array. – leafrain-Legit Apr 23 '21 at 04:12
please check this [answer](https://stackoverflow.com/a/66616075/7085389) how to convert String to byteArray – Shay Kin Apr 23 '21 at 04:14
that's helped you ? – Shay Kin Apr 23 '21 at 04:22
I got random symbol, instead of the object ID – leafrain-Legit Apr 23 '21 at 04:25
you convert the ID to byte or the Image to String sorry I didn't understand what this ID is – Shay Kin Apr 23 '21 at 04:28
sorry, I mean, if I covert bitmap like this bitmapdata.toString(Charset.defaultCharset()), I got random symbol after print it out in text view. – leafrain-Legit Apr 23 '21 at 04:34
you add the image data in textView? – Shay Kin Apr 23 '21 at 04:36
to convert an array of byte to String you must specify an Encoding like UTF 8 or what you want and when you come back to the byte array you must use the same encoding to avoid data losing – Shay Kin Apr 23 '21 at 04:42
1

because the image gonna encrypt with secret text, so I am testing it with text view, but I got random symbol – leafrain-Legit Apr 23 '21 at 04:44

How to convert byte array to image [kotlin]

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