Getting Started with Android programming-custom application

The Android system automatically creates an object of the application class for each program runtime and creates only one

Reference Blog: The use of application in Android

Reference article: The use of global object application and how to get application global objects Anywhere

Reference article: Android Basics of custom application

Custom

 Public class extends Application

Single-Case mode

    Private Static AppContext app;     /**      * Singleton mode      @return*/public         static  AppContext getinstance () {        return  app;    }    @Override    publicvoid  onCreate () {        super. OnCreate ();          This ;    }

Property

Private String UserID = "";      Public String GetUserID () {        return  UserID;    }      Public void Setuserid (String id) {        = id;    }

Get property value

AppContext. getinstance (). GetUserID ();

Getting Started with Android programming-custom application