Java tutorial
//package com.java2s; //License from project: Open Source License import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { public static byte[] getBitmap2Bytes(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); byte[] byteArray = stream.toByteArray(); return byteArray; } }