当用户单击Android中的“后退"按钮时，如何将数据从活动发送到片段?
我有一个打开新活动的片段.当用户单击后退"按钮时，如何将数据传递回该活动的片段?我尝试创建一个新的 Intent 并将数据放入其中，然后调用 setResult()，但是 Fragment 或 FragmentActivity 中的 onActivityResult 中包含任何内容.我现在唯一能想到的方法是通过静态方法，但仍然想看看是否有适当的方法来做到这一点?
I have a fragment that opens up a new activity. how can I pass data back to the fragment from that activity when user clicks on back button?
I've tried creating a new Intent and put data in there then call setResult(), but neither the Fragment or FragmentActivity got anything in onActivityResult. the only way I can think of now is through static method, but still want to see if there's a proper way of doing this?
谢谢！
调用静态函数并分配不是正确的解决方案.您可以使用接口回调，也可以使用startActivityForResult()方法.
calling static function and assigning is not a proper solution. you can use interface call back or you can use startActivityForResult() method.
界面回调的基本思想；
interface callback basic idea ;
public class YourActivity extends Activity{
private MyListener mFragmentCallbackListener;
public YourActivity(MyListener listener){
mFragmentCallbackListener = listener;
}
@Override
public void onBackPressed(){
if(mFragmentCallbackListener != null){
mFragmentCallbackListener.updateFragment(String data);
}
}
public interface MyListener{
void updateFragment(String data)
}
}