Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import android.graphics.Bitmap;
import android.graphics.Color;

public class Main {
    private static boolean calculateIsDark(Bitmap bitmap) {
        boolean dark = false;

        float darkThreshold = bitmap.getWidth() * (bitmap.getHeight() / 5) * 0.55f;
        int darkPixels = 0;

        int[] pixels = new int[bitmap.getWidth() * (bitmap.getHeight() / 5)];
        bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, bitmap.getHeight() / 5 * 4, bitmap.getWidth(),
                bitmap.getHeight() / 5);

        for (int pixel : pixels) {
            int r = Color.red(pixel);
            int g = Color.green(pixel);
            int b = Color.blue(pixel);
            double luminance = (0.299 * r + 0.0f + 0.587 * g + 0.0f + 0.114 * b + 0.0f);
            if (luminance < 150) {
                darkPixels++;
            }
        }

        if (darkPixels >= darkThreshold) {
            dark = true;
        }

        return dark;
    }
}