SharedPreferences simple to use

SharedPreferences 一般用于保存账号密码或者来判断程序是不是第一次运行

//保存数据
SharedPreferences sharedPreferences;
sharedPreferences = getSharedPreferences("text", Context.MODE_PRIVATE);//1.通过上下文得到
SharedPreferences.Editor editor = sp.edit();  //2.通过SharedPreferences得到编辑器用于保存数据
editor.putString("user",user);    //3.键值对的形式保存数据
editor.putString("password",password);
editor.commit();    //4.提交数据

// retrieve data

sharedPreferences = getSharedPreferences("text", Context.MODE_PRIVATE);

user = sharedPreferences.getString("user","");

passw = sharedPreferences.getString("password","");

Specific requirements specific to achieve it. It's easy and very easy to use!