我在 fragment 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 fragment 。有人可以指导我我做错了什么吗? 这是 fragment 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 fragment 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
}
}
}
最佳答案
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。
关于android - 带有 RecyclerView 的 SwipeRefreshLayout 在 Fragment 中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56216273/