Globals.java

/**
 * OpenAtlasForAndroid Project
 * The MIT License (MIT) Copyright (OpenAtlasForAndroid) 2015 Bunny Blue,achellies
 * <p>
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * <p>
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 * <p>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * @author BunnyBlue
 **/
package com.openatlas.boot;

import android.app.Application;
import android.content.pm.PackageManager.NameNotFoundException;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class Globals {
    private static Application sApplication;
    private static ClassLoader sClassLoader;
    private static String sInstalledVersionName;

    public static synchronized Application getApplication() {
        Application application;
        synchronized (Globals.class) {
            if (sApplication == null) {
                sApplication = getSystemApp();
            }
            application = sApplication;
        }
        return application;
    }

    public static synchronized ClassLoader getClassLoader() {
        ClassLoader classLoader;
        synchronized (Globals.class) {
            if (sClassLoader == null) {
                classLoader = getApplication().getClassLoader();
            } else {
                classLoader = sClassLoader;
            }
        }
        return classLoader;
    }

    private static Application getSystemApp() {
        try {
            Class<?> cls = Class.forName("android.app.ActivityThread");
            Method declaredMethod = cls.getDeclaredMethod(
                    "currentActivityThread");
            Field declaredField = cls.getDeclaredField("mInitialApplication");
            declaredField.setAccessible(true);
            return (Application) declaredField.get(declaredMethod.invoke(null
            ));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static String getVersionName() {
        try {
            return getApplication().getPackageManager().getPackageInfo(
                    getApplication().getPackageName(), 0).versionName;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
            return "null";
        }
    }

    public static String getInstalledVersionName() {
        return sInstalledVersionName;
    }

    public static int getVersionCode() {
        int i = 0;
        try {
            return getApplication().getPackageManager().getPackageInfo(
                    getApplication().getPackageName(), 0).versionCode;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
            return i;
        }
    }


}