我想用SwipeToRefresh小部件刷新我的片段。
这是我的XML代码

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/gradient_drawable"
    android:padding="10dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".Fragment_1">
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
   
     <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ProgressBar
            android:id="@+id/progress"
            android:layout_width="76dp"
            android:layout_height="64dp"
            android:elevation="10dp"
            android:foregroundGravity="center"
            android:indeterminateTint="@color/black"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.84" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/listview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:padding="5dp"/>

    </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</FrameLayout>

这是我的JAVA代码

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view=inflater.inflate(R.layout.fragment_1, container, false);

        newconfig= getResources().getConfiguration();
        db=new DBHandler(getActivity());
        swipeRefreshLayout=view.findViewById(R.id.swipe);
        recyclerView=view.findViewById(R.id.listview);
        progressBar=view.findViewById(R.id.progress);
        if(book.size()==0) {
            book = db.readCourses();
        }
        progressBar.setVisibility(View.GONE);
        BookFragAdapter adapter = new BookFragAdapter(Fragment_land1.this,book);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(),RecyclerView.VERTICAL,false));
        recyclerView.setAdapter(adapter);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
               this.onRefresh();
                getFragmentManager().beginTransaction().detach(Fragment_land1.this).attach(Fragment_land1.this).commit();
                swipeRefreshLayout.setRefreshing(false);
            }
        });

        return view;
    }

当我尝试刷新时，它没有刷新，并且小工具在250ms后没有停止。我假设onRefreshListener内的代码实际上没有执行，因此下一行被忽略。我不知道如何更改它。我在Stackoverflow和Developer.android中冲浪，没有一个答案解决了我的问题。有人能帮助我吗？