Java tutorial
//package com.java2s; import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { /** * Converts a Bitmap to a byteArray. * @return byteArray */ public static byte[] bitmapToByteArray(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); return stream.toByteArray(); } }