//sharedprefrences

           //name 直接寫名字  mode 通常用mode_private       

        sp = getSharedPreferences("config", MODE_PRIVATE);

btn_ok.setOnClickListener(new OnClickListener() {

           @Override

           publicvoid onClick(View v) {

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

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

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

                     Toast.makeText(getApplicationContext(),"不能為空", 200).show();

                     //獲取編輯器

                           Editor edit = sp.edit();

                         //保存數據

                          edit.putString("name", user);

                          edit.putString("pwd", pwd);

                          //提交保存

                          edit.commit();   

                  }            

           }

       });

 btn_show.setOnClickListener(newOnClickListener() {

            @Override

            publicvoid onClick(View v) {

                //獲取用戶名

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

                //獲取密碼

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

                //顯示

                et_name.setText(userName);

                et_password.setText(password);         

            }

        });