SwipeRefreshLayout簡單效果演示

谷歌出的SwipeRefreshLayout下拉刷新功能，很炫，廢話不多說，先上效果：

佈局文件，很簡單：

<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/swipe"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <ListView
       android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>

主文件，代碼中有註釋：

public class MainActivity extends AppCompatActivity {
    private SwipeRefreshLayout sw;
    private ListView listView;
    private List<String> mDatas;
    ArrayAdapter<String> mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sw = (SwipeRefreshLayout) findViewById(R.id.swipe);
        listView = (ListView) findViewById(R.id.listview);
        initData();

        sw.setSize(SwipeRefreshLayout.LARGE);//設置進度圈大小
        sw.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {//手勢滑動監聽
            @Override
            public void onRefresh() {
                //下拉完畢加載數據
                new Thread() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(2000);//模擬耗時操作，觀察刷新時效果
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        Message msg = new Message();
                        msg.what = 1;
                        handler.sendMessage(msg);
                    }
                }.start();
            }
        });
        sw.setColorSchemeColors(Color.RED, Color.BLUE, Color.GREEN);//進度條顏色
        sw.setProgressBackgroundColorSchemeColor(Color.YELLOW);//進度條背景顏色

        sw.setDistanceToTriggerSync(70);//下拉多少距離可以刷新
    }

    public void initData() {//初始化數據
        mDatas = new ArrayList<String>();
        for (int i = 0; i < 5; i++) {
            mDatas.add("第" + i + "條數據");
        }
        mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mDatas);
        listView.setAdapter(mAdapter);
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    mDatas.add("add數據");
                    mAdapter.notifyDataSetChanged();//更新數據
                    sw.setRefreshing(false);//關閉刷新動畫，若爲true，則一直顯示
                    break;
            }
        }
    };

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