Java tutorial
//package com.java2s; import android.graphics.Bitmap; import java.io.ByteArrayOutputStream; public class Main { public static byte[] getBitmapBytes(Bitmap paramBitmap) { ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream(); paramBitmap.compress(Bitmap.CompressFormat.PNG, 100, localByteArrayOutputStream); return localByteArrayOutputStream.toByteArray(); } }