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.app.Activity;

import android.util.DisplayMetrics;
import java.text.DecimalFormat;

public class Main {
    private static DisplayMetrics dm;

    public static double getDPI(Activity activity) {
        return calculateDPI(getWidth(activity), getHeight(activity),
                Double.valueOf(new DecimalFormat("#.##").format(getScreenSize(activity))));
    }

    public static double calculateDPI(int width, int height, double screenSize) {
        return Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)) / screenSize;
    }

    public static int getWidth(Activity activity) {
        if (dm == null) {
            dm = new DisplayMetrics();
        }
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.widthPixels;
    }

    public static int getHeight(Activity activity) {
        if (dm == null) {
            dm = new DisplayMetrics();
        }
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        return dm.heightPixels;
    }

    public static double getScreenSize(Activity activity) {
        if (dm == null) {
            dm = new DisplayMetrics();
        }
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        double x = Math.pow(dm.widthPixels / dm.densityDpi, 2);
        double y = Math.pow(dm.heightPixels / dm.densityDpi, 2);
        return Math.sqrt(x + y);
    }
}