Get Global Context (Getapplicationcontext) _ Create shared Preference Tool Class _ Implement automatic login

Get Global Context (Getapplicationcontext) _ Create shared Preference Tool Class _ Implement automatic login

=========================== Gets the global context (Getapplicationcontext) ========================

1. Create the MyApplication extends in the Com.example.autologin.myapplication package application

Code:

1  Public classMyApplicationextendsApplication2 {3     Private Staticcontext context;4     5 @Override6      Public voidonCreate ()7     {8         Super. OnCreate ();9         TenContext =Getapplicationcontext (); One     } A      -      Public StaticContext getappcontext () -     { the         returncontext; -     } -}

2. Add an attribute in Androidmanifest.xml, stating MyApplication:

Android:name= "Com.example.autologin.myapplication.Myapplication"

Code:

1 <!--Disclaimer MyApplication -2 <Application3     Android:name= "Com.example.autologin.myapplication.Myapplication"4 Android:allowbackup= "true"5 Android:icon= "@drawable/ic_launcher"6 Android:label= "@string/app_name"7 Android:theme= "@style/apptheme" >8 9     <!-- .......  -Ten  One </Application>

================================ Creating a shared preference tool class ==============================

Create the Sputil.java class in package Com.example.autologin.utils:

Code:

1  Public classSputil2 {3     //4     //Create a static Sharedpreferences object from a global context5     //6     Private StaticSharedpreferences SP =7Myapplication.getappcontext (). Getsharedpreferences ("User", context.mode_private);8 9     //static Save user account password methodTen      Public Static voidSaveuser (string name, string pwd) One     { AEditor edit =Sp.edit (); -Edit.putstring ("username", name); -Edit.putstring ("pwd", PWD); the  - edit.commit (); -  -     } +  -     // +     //Save if you have a status of logged in A     // at      Public Static voidIsLogin (Booleanislogin) -     { -Editor edit =Sp.edit (); -Edit.putboolean ("IsLogin", islogin); - edit.commit (); -     } in  -     // to     //Read if there is a status of logged in +     // -      Public Static BooleanGetislogin () the     { *         returnSp.getboolean ("IsLogin",false); $     }Panax Notoginseng}

============================= Implement automatic Login ============================

Create Welcome page Splashactivity.java, read the login status, if you have logged in directly to the main page, did not log on to the jump login page

Code:

1Handler Handler =NewHandler ();2Handler.postdelayed (NewRunnable ()3 {4 @Override5      Public voidRun ()6     {7         //8         //If you have ever logged in9         //jump directly to the main pageTen         // One         if(Sputil.getislogin ()) A         { -Intent Intent =NewIntent (splashactivity. This, Mainactivity.class); - startactivity (intent); theSplashactivity. This. Finish (); -}Else -         { -             // +             //If you have not logged in -             //Jump Login Page +             // AIntent Intent =NewIntent (splashactivity. This, Loginactivity.class); at startactivity (intent); -Splashactivity. This. Finish (); -         } -  -     } -}, 3000);

* * Note: Set Splashactivity.java as the startup page

Get Global Context (Getapplicationcontext) _ Create shared Preference Tool Class _ Implement automatic login