运行Android应用程序时如何自动登录 [英] How to auto login when I run the Android Application

问题描述

假设我已经使用PHP + MySQL登录到系统，然后在退出应用程序后再次运行应用程序，无需再次登录并自动登录，请帮助解决问题.

Assume that I have login to system using PHP + MySQL, then, after I exit the apps, I run the apps again, no need to login again and auto login, Please help to solve the problem.

推荐答案

在首次登录时，您会以响应方式获取用户名或用户名，而不是将用户名或用户名存储在sharedpreference中，如下所示

while first time login u get something username or userid in respones than store ther username or userid in sharedpreference like as shown below

  SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(YourActivity.this);

  prefs.edit().putInt("userid",userid).commit();

成功登录后，这将优先存储您的用户ID，您可以检查您是否已经登录

as after succesfull login this will store your userid in preference and u can check u are already login or not as

int Userid;
prefs = PreferenceManager.getDefaultSharedPreferences(YourActivity.this);
Userid= mPrefs.getInt("userid", 0);  which will return defalut value 0 if u are not login 

检查后

 if(Userid>0){
  // Means  u are already logged in  do here code what u want if u are login 
  }else{
    // Means  u are not logged in than go to your login pageview from here
 }

这只是做您想要的事情的简单方法，如果您希望在单击按钮时比在onclick事件上需要注销功能，则必须添加以下代码以退出注销

this is just simple way for doing what u want suppose if u want logoout functionality on button click than onclick event u have to add following code for logout which will clear prefernce

 prefs = PreferenceManager.getDefaultSharedPreferences(MyAccountActivity.this);
 prefs.edit().clear().commit();

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