Classe utilitária para conversão de imagem bitmap em base 64 e vice versa.

Base64Util.java

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.util.Log;

import java.io.ByteArrayOutputStream;

/**
 * Created by elcio on 27/11/15.
 */
public class Base64Util {

    public static String encodeTobase64(Bitmap image)
    {
        Bitmap immagex=image;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        immagex.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] b = baos.toByteArray();
        String imageEncoded = Base64.encodeToString(b,Base64.DEFAULT);

        Log.e("LOOK", imageEncoded);
        return imageEncoded;
    }
    
    public static Bitmap decodeBase64(String input)
    {
        byte[] decodedByte = Base64.decode(input, 0);
        return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
    }


}