Android v4包中的 SwipeRefreshLayout 官方的下拉刷新組件

SwipeRefreshLayout在v4包下，對應的v4Demo中也有相應的例子。如果沒有請下載最新support-v4

SwipeRefreshLayout 只能有一個直接子View，可能是一個ListView或一個Layout或其他需要刷新的組件。

setOnRefreshListener 用於監聽刷新的動作。SwipeRefreshLayout 下拉，就會有刷新的效果出來，觸發該監聽。

如果需要一個刷新的動畫，setRefreshing(true)， 停: setRefreshing(false)

如果要禁用刷新動畫和手勢響應，ssetEnable(false)， 恢復setEnable(true)

來個v4的例子：

public class SwipeRefreshLayoutActivity extends Activity implements OnRefreshListener {
    public static final String[] TITLES =
    {
            "Henry IV (1)",
            "Henry V",
            "Henry VIII",
            "Richard II",
            "Richard III",
            "Merchant of Venice",
            "Othello",
            "King Lear",
            "Henry IV (1)",
            "Henry V",
            "Henry VIII",
            "Richard II",
            "Richard III",
            "Merchant of Venice",
            "Othello",
            "King Lear",
            "Henry IV (1)",
            "Henry V",
            "Henry VIII",
            "Richard II",
            "Richard III",
            "Merchant of Venice",
            "Othello",
            "King Lear",
            "Henry IV (1)",
            "Henry V",
            "Henry VIII",
            "Richard II",
            "Richard III",
            "Merchant of Venice",
            "Othello",
            "King Lear"
    };
    // Try a SUPER quick refresh to make sure we don't get extra refreshes
    // while the user's finger is still down.
    private static final boolean SUPER_QUICK_REFRESH = false;
    private View mContent;
    private SwipeRefreshLayout mSwipeRefreshWidget;
    private ListView mList;
    private Handler mHandler = new Handler();
    private final Runnable mRefreshDone = new Runnable() {

        @Override
        public void run() {
            mSwipeRefreshWidget.setRefreshing(false);
        }

    };
    @Override
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        setContentView(R.layout.swipe_refresh_widget_sample);
        mSwipeRefreshWidget = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_widget);
        mSwipeRefreshWidget.setColorScheme(R.color.color1, R.color.color2, R.color.color3,
                R.color.color4);
        mList = (ListView) findViewById(R.id.content);
        ArrayAdapter arrayAdapter = new ArrayAdapter(this,
                android.R.layout.simple_list_item_1, android.R.id.text1, TITLES);
        mList.setAdapter(arrayAdapter);
        mSwipeRefreshWidget.setOnRefreshListener(this);
        mSwipeRefreshWidget.setProgressViewEndTarget(false, 8);
    }

    @Override
    public void onRefresh() {
        refresh();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.swipe_refresh_menu, menu);
        return true;
    }

    /**
     * Click handler for the menu item to force a refresh.
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        final int id = item.getItemId();
        switch(id) {
            case R.id.force_refresh:
                mSwipeRefreshWidget.setRefreshing(true);
                refresh();
                return true;
        }
        return false;
    }

    private void refresh() {
        mHandler.removeCallbacks(mRefreshDone);
        mHandler.postDelayed(mRefreshDone, 1000);
    }
}