Java tutorial
//package com.java2s; //License from project: Open Source License import android.graphics.Bitmap; import java.util.Arrays; public class Main { /** * Get the hashcode for a bitmap. */ private static String hashBitmap(Bitmap bmp) { int[] allpixels = new int[bmp.getHeight() * bmp.getWidth()]; bmp.getPixels(allpixels, 0, bmp.getWidth(), 0, 0, bmp.getWidth(), bmp.getHeight()); return Integer.toHexString(Arrays.hashCode(allpixels)); } }