Java tutorial
//package com.java2s; import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { /** * This method converts a bitmap image to a byte array. * * @param bm * @return */ public static byte[] getBytesFromBitmap(Bitmap bm) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, stream); return stream.toByteArray(); } }