调用Activity:startActivityForResult(Intent intent, int requestCode);
//requestCode标明来自哪个Activity的请求，以便向对应Activity返回数据调用Activity:onActivityResult(int requestCode, int resultCode, Intent data)
//requestCode标明从哪个窗口返回的数据，resultCode是处理结果的标记码被调用Activity:setResult(int resultCode, Intent data)
//设置处理结果，返回给调用Activity
