//获得sp实例对象
        sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);
        //如果登陆过，直接登录
        if(sp.getBoolean("ISLOAD",false)) {
            Intent intent = new Intent(this, MainActivity.class);
            intent.putExtra("USER",sp.getString("USER_NAME", ""));
            startActivity(intent);
            this.finish();//关闭登录界面
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
                //调用uiHandler
                Message msg = new Message();
                uiHandler.sendMessage(msg);
                finish();
            } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }

        private Handler uiHandler= new Handler(){
            @Override
            public void handleMessage(Message msg) {
                //记住用户名、密码、
                SharedPreferences.Editor editor = sp.edit();
                editor.putString("USER_NAME", mEmail);
                editor.putString("PASSWORD", mPassword);
                editor.putBoolean("ISLOAD", true);
                editor.commit();

                // Activity跳转
                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                startActivity(intent);
            }
        };