Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.Bitmap;

public class Main {
    /**
     * calculate hashcode for a bitmap.
     * only calculate part of the first row for performance purpose.
     * if you want to involve every pixels, use {@link #bitmap2hashFull(Bitmap)}.
     * @return hash code
     */
    public static long bitmap2hash(Bitmap bitmap) {
        if (bitmap == null)
            return 0;
        long hash = 31;
        int end = bitmap.getWidth() / 5;
        for (int x = 0; x < end; x++) {
            hash *= (bitmap.getPixel(x, 0) + 31);
        }
        return hash;
    }
}