Encode and Decode Bitmap Object in Base64 String in Android

Encode and decode bitmap object in base64 string in Android

public static String encodeToBase64(Bitmap image, Bitmap.CompressFormat compressFormat, int quality)
{
    ByteArrayOutputStream byteArrayOS = new ByteArrayOutputStream();
    image.compress(compressFormat, quality, byteArrayOS);
    return Base64.encodeToString(byteArrayOS.toByteArray(), Base64.DEFAULT);
}

public static Bitmap decodeBase64(String input)
{
    byte[] decodedBytes = Base64.decode(input, 0);
    return BitmapFactory.decodeByteArray(decodedBytes, 0, decodedBytes.length);
}

Example usage:

String myBase64Image = encodeToBase64(myBitmap, Bitmap.CompressFormat.JPEG, 100);
Bitmap myBitmapAgain = decodeBase64(myBase64Image);

How to convert a Base64 string into a Bitmap image to show it in a ImageView?

You can just basically revert your code using some other built in methods.

byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); 

Android Bitmap to Base64 String

use following method to convert bitmap to byte array:

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();  
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();

to encode base64 from byte array use following method

String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);

Convert base64 string to image in Android

     //encode image(from image path) to base64 string
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                Bitmap bitmap = BitmapFactory.decodeFile(pathOfYourImage);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                byte[] imageBytes = baos.toByteArray();
                String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);

     //encode image(image from drawable) to base64 string
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.yourDrawableImage);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                byte[] imageBytes = baos.toByteArray();
                String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);

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