【Android-SwipeRefreshLayout控件】下拉刷新

Android自帶API ，V4包下面的下拉刷新控件

android.support.v4.widget.SwipeRefreshLayout

SwipeRefreshLayout只能包含一個控件

佈局例子：

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

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

        </ListView>

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

應用例子：

/**
 * SwipeRefreshLayout控件學習
 */

public class RefreshActicity extends AppCompatActivity {

    SwipeRefreshLayout swipeRefreshLayout;
    ListView listView;
    List<Product> list = new ArrayList<>();
    ProductAdapter adapter;


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

        swipeRefreshLayout = findViewById(R.id.swipeRefreshLayout);
        listView = findViewById(R.id.listView);

        //獲取數據
        initData();

        //設置適配器
        adapter = new ProductAdapter(this, list);
        listView.setAdapter(adapter);


        //設置下拉進度的背景顏色，默認是白色
        swipeRefreshLayout.setProgressBackgroundColorSchemeResource(android.R.color.white);
        //設置下拉進度的肢體顏色
        swipeRefreshLayout.setColorSchemeResources(R.color.colorAccent, R.color.colorPrimary, R.color.colorPrimaryDark);
        //下拉時觸發下拉動畫，動畫完畢後回調這個方法
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                //開始刷新，設置當前爲刷新狀態（刷新狀態會屏蔽掉下拉事件）
                swipeRefreshLayout.setRefreshing(true);
                //耗時操做，好比聯網獲取數據
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        list.clear();
                        initData();
                        adapter.notifyDataSetChanged();
                        //加載完數據，設置爲不刷新狀態，將下拉進度收起來
                        swipeRefreshLayout.setRefreshing(false);

                    }
                }, 2000);
            }
        });


    }

    /**
     * 生成10條List數據
     */
    private void initData() {
        for (int i = 1; i <= 10; i++) {
            Random random = new Random();
            Product product = new Product("100" + i, "testdata", random.nextInt(100));
            list.add(product);
        }
    }
}