private void getUserInfoFromPref(){

/*

 * 保存到文件的方法

 *

 *          Constant.user = (User)Constant.readObjectFromFile(Constant.USER_SAVE_PATH);

 */

         //获取到sharepreference 对象， 参数一为xml文件名，参数为文件的可操作模式

        SharedPreferences preferences = this.getSharedPreferences(

                Constant.PREF_FILE_NAME, MODE_APPEND);

        //获取到编辑对象

        String UserId = preferences.getString("UserId","");

        String UserName = preferences.getString("UserName","");

        String UserPho = preferences.getString("UserPho","");

        String UserQRCode = preferences.getString("UserQRCode","");

        String PhotoPath = preferences.getString("PhotoPath","");

        boolean hasLogined = preferences.getBoolean("hasLogined",false);

        Constant.user = new User(UserId,UserName,UserPho,UserQRCode,PhotoPath,hasLogined);

    }

//保存数据 到sharePreference文件

    private void setUserInfoToPref(){

/*

 * 文件的方法

 *

 * File file = new File("/sdcard/myImage/");

        if(!file.exists()){

              file.mkdirs();// 创建文件夹

         }

        Constant.writeObjectToFile(Constant.USER_SAVE_PATH,Constant.user);

        Log.e("user ---",Constant.readObjectFromFile(Constant.USER_SAVE_PATH).toString());

 *

*/

       SharedPreferences preferences = getSharedPreferences(

               Constant.PREF_FILE_NAME, MODE_PRIVATE);

       SharedPreferences.Editor editor = preferences.edit();

       if(Constant.user != null){

           editor.putString("UserId",Constant.user.UserId);

           editor.putString("UserName",Constant.user.UserName);

           editor.putString("UserPho",Constant.user.UserPho);

           editor.putString("UserQRCode",Constant.user.UserQRCode);

           editor.putString("PhotoPath",Constant.user.PhotoPath);

           editor.putBoolean("hasLogined",Constant.user.hasLogined);

       }

       editor.commit();

    }