Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; import java.io.IOException; public class Main { /** * TODO doc * * @param photoBitmap * @return */ public static byte[] toByteArray(Bitmap photoBitmap) throws IOException { ByteArrayOutputStream blob = new ByteArrayOutputStream(); photoBitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, blob); byte[] photoByteArray = blob.toByteArray(); blob.close(); return photoByteArray; } }