How to convert bitmap to byte array and byte array to bitmap in android?

Question

I convert bitmap to byte array and byte array to bitmap but when I have to show converted byte array in ImageView then it will show image with black corners not show in PNG format. I want to show image in PNG format, how can I do that??

Here is a code for bitmap to byte array conversion and byte array to bitmap:

Bitmap into byte array in PNG compressed format:

public byte[] convertBitmapToByteArray(Bitmap bitmap) {
    ByteArrayOutputStream stream = null;
    try {
        stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);

        return stream.toByteArray();
    }finally {
        if (stream != null) {
            try {
                stream.close();
            } catch (IOException e) {
                Log.e(Helper.class.getSimpleName(), "ByteArrayOutputStream was not closed");
            }
        }
    }
}

and convert byte array to bitmap as:

BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);

@Prem that's not show image in png format. Show image with black png spaces — user5269722
– user5269722, Commented Nov 22, 2017 at 10:16

Abhishek Singh · Accepted Answer · 2017-11-22 10:42:39Z

10

Try this code

//For encoding toString
public String getStringImage(Bitmap bmp){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] imageBytes = baos.toByteArray();
    String encodedImage = android.util.Base64.encodeToString(imageBytes, Base64.DEFAULT);
    return encodedImage;
}
//For decoding
String str=encodedImage;
byte data[]= android.util.Base64.decode(str, android.util.Base64.DEFAULT);
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);

edited Nov 22, 2017 at 10:42

answered Nov 22, 2017 at 10:12

Abhishek Singh

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Comments

David Buck · Accepted Answer · 2020-03-31 14:14:21Z

0

use this code:

public String convertBitmapToString(Bitmap bmp){
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.JPEG, 100, stream); //compress to which format you want.
        byte[] byte_arr = stream.toByteArray();
        String imageStr = Base64.encodeBytes(byte_arr);
        return imageStr;
    }

edited Mar 31, 2020 at 14:14

David Buck

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answered Mar 31, 2020 at 13:53

hamid

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