Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.util.Base64; import java.io.ByteArrayOutputStream; public class Main { public static byte[] getImageBytes(Bitmap bmp) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos); byte[] imageBytes = baos.toByteArray(); String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT); return imageBytes; } }