Androidx RecyclerView(二 ): 下拉刷新

1.添加依赖

implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.0.0'

2. 修改xml将RecyclerView包裹起来

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

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:layout_editor_absoluteX="0dp"
            tools:layout_editor_absoluteY="0dp" />
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

3. 修改activity的代码onCreate

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycle);

        initCrush();
        CrushRecyclerView();
        // 下拉刷新组件及刷新
        mySwipeRefreshLayout = findViewById(R.id.main_refresh);
        mySwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                Toast.makeText(RecycleActivity.this,"刷新完成",Toast.LENGTH_LONG).show();
                mySwipeRefreshLayout.setRefreshing(false);

                // 改变数据
                changeCrush();
                // 通知adapter刷新数据
                adapter.notifyDataSetChanged();
            }
        });
    }

附件：changeCrush（）,仅改变adapt的数据即可

private void changeCrush() {
        crushList.clear();
        for (int i = 0; i < 2; i++) {
            Crush image0 = new Crush("change0", R.drawable.img0);
            crushList.add(image0);
            Crush image01 = new Crush("change1", R.drawable.img01);
            crushList.add(image01);
            Crush image02 = new Crush("change2", R.drawable.img02);
            crushList.add(image02);
            Crush image03 = new Crush("change3", R.drawable.img03);
            crushList.add(image03);
        }
    }