关于android想实现注册后返回登录界面自动填写刚刚的账号密码信息

代码如下 值传过来了 但是赋值不成功

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        Toast.makeText(getApplicationContext(),
                data.getExtras().getString("loginName"), 0).show();

        if (resultCode == this.RESULT_OK && requestCode == 100) {

            Toast.makeText(getApplicationContext(),
                    data.getExtras().getString("loginPwd"), 0).show();

            loginNameET.setText(data.getExtras().getString("loginName"));
            loginPwdET.setText(data.getExtras().getString("loginPwd"));

        }

    }