Android SwipeRefreshLayout 下拉刷新组件的使用

<android.support.v4.widget.SwipeRefreshLayout
    android:id="@+id/swipeLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_gravity="center_horizontal" />

</android.support.v4.widget.SwipeRefreshLayout>

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /*获取ListView*/
        listView = (ListView) findViewById(R.id.listView);
        /*为listView 添加适配器*/
        listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, getData()));

        /*获取SwipeRefreshLayout*/
        swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipeLayout);
        /*设置下拉刷新监听器*/
        swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                swipeLayout.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        swipeLayout.setRefreshing(false);
                    }
                }, 3000);    //延时3秒
            }
        });
    }

    /*预先定义listView显示的列表项*/
    private List<String> getData() {
        List<String> data = new ArrayList<String>();
        for (int i = 0; i < 20; i++) {
            data.add("Item list " + (i + 1));
        }
        return data;
    }