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.content.res.Configuration;
import android.util.DisplayMetrics;

public class Main {
    /**
     * Get the span count for a gridlayoutmanager for example. returns how many columns the
     * list of items should contain.
     * @param activity
     * @return The amount of columns the screen can fit
     */
    public static int getSpanCount(Activity activity) {
        double diagonalInches = getDisplayInches(activity);
        int orientation = getDisplayOrientation(activity);

        if (diagonalInches >= 10) {
            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                return 3;
            } else {
                return 4;
            }
        } else if (diagonalInches >= 7) {
            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                return 2;
            } else {
                return 3;
            }
        }

        else {
            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                return 1;
            } else {
                return 1;
            }

        }

    }

    private static double getDisplayInches(Activity activity) {
        DisplayMetrics metrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        int widthPixels = metrics.widthPixels;
        int heightPixels = metrics.heightPixels;

        float widthDpi = metrics.xdpi;
        float heightDpi = metrics.ydpi;

        float widthInches = widthPixels / widthDpi;
        float heightInches = heightPixels / heightDpi;

        double diagonalInches = Math.sqrt((widthInches * widthInches) + (heightInches * heightInches));

        return diagonalInches;
    }

    private static int getDisplayOrientation(Activity activity) {
        return activity.getResources().getConfiguration().orientation;
    }
}