//sharedprefrences

          //name 直接写名字  mode 通常用mode_private

       sp = getSharedPreferences("config",MODE_PRIVATE);

btn_ok.setOnClickListener(newOnClickListener() {

          @Override

         publicvoidonClick(View v) {

                 String user = et_user.getText().toString().trim();

                 String pwd = et_pwd.getText().toString().trim();

                if(user.isEmpty()||pwd.isEmpty()){

                    Toast.makeText(getApplicationContext(),"不能为空", 200).show();

                    //获取编辑器

                          Editor edit = sp.edit();

                        //保存数据

                         edit.putString("name", user);

                         edit.putString("pwd", pwd);

                         //提交保存

                         edit.commit();

                 }    

          }

      });

btn_show.setOnClickListener(newOnClickListener() {

           @Override

           publicvoid onClick(View v) {

               //获取用户名

               StringuserName = sp.getString("name", null);

               //获取密码

               Stringpassword = sp.getString("password", null);

               //显示

               et_name.setText(userName);

               et_password.setText(password); 

           }

       });