ListView下拉刷新

以后会经常用到下拉刷新和上拉刷新的，今天用了，就记录一下，方便以后的使用。

下载地址：https://github.com/chrisbanes/Android-PullToRefresh

1.导包

2.xml布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

3.Activity中：

public class MainActivity extends Activity implements
		OnRefreshListener<ListView> {
	private MyHandler handler = new MyHandler();
	/** 从第三页开始显示吧 */
	private int current_head_index = 3;
	/** 后面是第三页开始 */
	private int current_foot_index = 4;
	private PullToRefreshListView mPullRefreshListView;
	/** 数据集合 */
	private ArrayList<String> data;
	/** 简单的适配器 */
	private ArrayAdapter<String> adapter;
	private boolean ishead = false;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.listview);
		data = new ArrayList<String>();
		addData();
		adapter = new ArrayAdapter<String>(MainActivity.this,
				android.R.layout.simple_list_item_1, data);
		mPullRefreshListView.setOnRefreshListener(this);
		/** 上下都刷新 */
		mPullRefreshListView.setMode(Mode.BOTH);
		mPullRefreshListView.getLoadingLayoutProxy(false, true).setPullLabel(
				"下拉中");
		mPullRefreshListView.getLoadingLayoutProxy(false, true)
				.setRefreshingLabel("刷新中");
		mPullRefreshListView.getLoadingLayoutProxy(false, true)
				.setReleaseLabel("释放了");
		/** 需要listView */
		ListView actualListView = mPullRefreshListView.getRefreshableView();
		actualListView.setAdapter(adapter);
		actualListView.setOnScrollListener(new OnScrollListener() {

			@Override
			public void onScrollStateChanged(AbsListView view, int scrollState) {
				// TODO Auto-generated method stub

			}

			@Override
			public void onScroll(AbsListView view, int firstVisibleItem,
					int visibleItemCount, int totalItemCount) {
				// TODO Auto-generated method stub
				/** 如果第一条看得见 就下拉刷新 */
				if (firstVisibleItem == 0) {
					ishead = true;
				} else {
					ishead = false;
				}
			}
		});
	}

	private void addData() {
		if (current_head_index >= 1) {
			if (ishead) {
				int tempIndex = current_head_index * 10;
				for (int i = tempIndex; i > tempIndex - 10; i--) {
					data.add(0, i + "");
				}
				current_head_index--;
			} else {
				int tempIndex = current_foot_index * 10;
				for (int i = tempIndex - 10; i < tempIndex; i++) {
					data.add(i + "");
				}
				current_foot_index++;
			}
		}
	}

	@Override
	public void onRefresh(PullToRefreshBase<ListView> refreshView) {
		// TODO Auto-generated method stub
		new MyThread().start();
	}

	private class MyThread extends Thread {

		@Override
		public void run() {
			// TODO Auto-generated method stub

			super.run();
			try {
				sleep(3000);
				/** 让主线程更新UI */
				Message msg = handler.obtainMessage();

				handler.sendMessage(msg);

			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	private class MyHandler extends Handler {
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			super.handleMessage(msg);

			/** 更新数据 */
			addData();
			adapter.notifyDataSetChanged();
			mPullRefreshListView.onRefreshComplete();
		}
	}
}

记得以下几个点：

1.用一个变量来标志请求数据是上拉还是下拉（在listView的setOnScrollListener() 的监听器中来监听是下拉还是上拉，如果第一条看见了，肯定下拉，前提是第一次的条目要很多，使得第一条会滚出屏幕!!!）

2.上拉的话，数据记得加在0处，下拉就直接加在后面了

3.差点忘记了，那个ListView 是这样得到的

ListView actualListView = mPullRefreshListView.getRefreshableView();

4.记得

adapter.notifyDataSetChanged();
mPullRefreshListView.onRefreshComplete();

5.明天还要做别的不知道能不能搞定呢？？

项目和支持库下载地址：
http://download.youkuaiyun.com/detail/yymonkeydo/8121035

listView代码中配置：

//滚动条的宽度
istView.setScrollBarSize(3);
//滚动条的背景图片为空
listView.setDivider(null);
//条目之间的距离
listView.setDividerHeight(10);