Here you can find the source of bitmap2Bytes(Bitmap bm)
public static byte[] bitmap2Bytes(Bitmap bm)
//package com.java2s; import java.io.ByteArrayOutputStream; import android.graphics.Bitmap; public class Main { public static byte[] bitmap2Bytes(Bitmap bm) { if (bm == null) { return null; }// w w w.ja v a2s .c o m ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } }