Kotlin onActivityResult() 未在新的嵌套片段 API 中调用

I have been using the new nested fragment API that Android includes in the support library.

The problem that I am facing with nested fragments is that, if a nested fragment (that is, a fragment that has been added to another fragment via the FragmentManagerreturned by getChildFragmentManager()) calls startActivityForResult(), the nested fragment's onActivityResult() method is not called. However, both the parent fragment's onActivityResult() and activity's onActivityResult() do get called.

我不知道我是否遗漏了嵌套片段的某些内容，但我没有预料到所描述的行为.下面是重现此问题的代码.如果有人能为我指明正确的方向，并向我解释我做错了什么，我将不胜感激:

package com.example.nestedfragmentactivityresult;

import android.media.RingtoneManager;
import android.os.Bundle;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends FragmentActivity
{
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        this.getSupportFragmentManager()
            .beginTransaction()
            .add(android.R.id.content, new ContainerFragment())
            .commit();
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        super.onActivityResult(requestCode, resultCode, data);

        // This is called
        Toast.makeText(getApplication(),
            "Consumed by activity",
            Toast.LENGTH_SHORT).show();
    }

    public static class ContainerFragment extends Fragment
    {
        public final View onCreateView(LayoutInflater inflater,
                                       ViewGroup container,
                                       Bundle savedInstanceState)
        {
            View result = inflater.inflate(R.layout.test_nested_fragment_container,
                container,
                false);

            return result;
        }

        public void onActivityCreated(Bundle savedInstanceState)
        {
            super.onActivityCreated(savedInstanceState);
            getChildFragmentManager().beginTransaction()
                .add(R.id.content, new NestedFragment())
                .commit();
        }

        public void onActivityResult(int requestCode,
                                     int resultCode,
                                     Intent data)
        {
            super.onActivityResult(requestCode, resultCode, data);

            // This is called
            Toast.makeText(getActivity(),
                "Consumed by parent fragment",
                Toast.LENGTH_SHORT).show();
        }
    }

    public static class NestedFragment extends Fragment
    {
        public final View onCreateView(LayoutInflater inflater,
                                       ViewGroup container,
                                       Bundle savedInstanceState)
        {
            Button button = new Button(getActivity());
            button.setText("Click me!");
            button.setOnClickListener(new View.OnClickListener()
            {
                public void onClick(View v)
                {
                    Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
                    startActivityForResult(intent, 0);
                }
            });

            return button;
        }

        public void onActivityResult(int requestCode,
                                     int resultCode,
                                     Intent data)
        {
            super.onActivityResult(requestCode, resultCode, data);

            // This is NOT called
            Toast.makeText(getActivity(),
                "Consumed by nested fragment",
                Toast.LENGTH_SHORT).show();
        }
    }
}

test_nested_fragment_container.xml is:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/content"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

</FrameLayout>