【Android-SwipeRefreshLayout控件】下拉刷新

Android自带API ，V4包下面的下拉刷新控件

android.support.v4.widget.SwipeRefreshLayout

SwipeRefreshLayout只能包含一个控件

布局例子：

  <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>

应用例子：

/**
 * SwipeRefreshLayout控件学习
 */

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);

        //获取数据
        initData();

        //设置适配器
        adapter = new ProductAdapter(this, list);
        listView.setAdapter(adapter);

        //设置下拉进度的背景颜色，默认是白色
        swipeRefreshLayout.setProgressBackgroundColorSchemeResource(android.R.color.white);
        //设置下拉进度的肢体颜色
        swipeRefreshLayout.setColorSchemeResources(R.color.colorAccent, R.color.colorPrimary, R.color.colorPrimaryDark);
        //下拉时触发下拉动画，动画完毕后回调这个方法
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                //开始刷新，设置当前为刷新状态（刷新状态会屏蔽掉下拉事件）
                swipeRefreshLayout.setRefreshing(true);
                //耗时操作，比如联网获取数据
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        list.clear();
                        initData();
                        adapter.notifyDataSetChanged();
                        //加载完数据，设置为不刷新状态，将下拉进度收起来
                        swipeRefreshLayout.setRefreshing(false);

                    }
                }, 2000);
            }
        });

    }

    /**
     * 生成10条List数据
     */
    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);
        }
    }
}