Java tutorial
//package com.java2s; //License from project: Open Source License import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { /** * convert Bitmap to byte array * @param bitmap * @return */ public static byte[] bitmapToByte(Bitmap bitmap) { if (bitmap == null) { return null; } ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } }