带有 RecyclerView 的 SwipeRefreshLayout 在 Fragment 中不起作用

Question

我在片段中的 SwipeRefreshLayout 中有一个 recyclerview 。我已经实现了 AsyncTask 来为 recyclerview 获取数据。问题是 SwipeRefreshLayout 根本不显示，因此数据不会填充到 recyclerview 中。我对 Activity 做了同样的事情，它工作得很好，但不是片段。有人可以指导我我做错了什么吗？这是片段的布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".FeatureFragment">

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/refresh_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        </androidx.recyclerview.widget.RecyclerView>

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</LinearLayout>

这是我在片段类中所做的。

public class FeaturedFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
    private RecyclerView mRecyclerView;
    private SwipeRefreshLayout mSwipeLayout;
    public FeaturedFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_featured_captions, container, false);
        mRecyclerView = view.findViewById(R.id.recyclerView);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        mSwipeLayout = view.findViewById(R.id.refresh_layout);
        mSwipeLayout.setOnRefreshListener(this);
        return view;
    }

    @Override
    public void onRefresh() {
        new FetchFeedTask().execute((Void) null);
    }


    private class FetchFeedTask extends AsyncTask<Void, Void, Boolean> {
        @Override
        protected void onPreExecute() {
            mSwipeLayout.setRefreshing(true);
        }

        @Override
        protected Boolean doInBackground(Void... voids) {
            //things to do in background
        }

        @Override
        protected void onPostExecute(Boolean success) {
            mSwipeLayout.setRefreshing(false);
            mRecyclerView.setAdapter(/*adapter*/);
            //things to do at the end
        }
    }

}

Answer 1

现在回答已经太晚了，但可能对其他人有帮助。我遇到了同样的问题，这是因为 recyclerView 是 swipeRefreshLayout 的直接子级，因此只需将 recyclerView 放入布局（例如 ConstraintLayout）中，然后将此布局放入 swipeRefreshLayout 中，一切都会按您的预期工作。