Android ListView下拉与上拉刷新加载更多数据 二

效果图：

java代码中： 

public class MainActivity extends Activity implements OnRefreshListener,
		OnLoadListener {

	private RefreshLayout swipeLayout;
	private ListView listView;
	private MyAdapter adapter;
	private ArrayList<HashMap<String, String>> list;
	private View header;

	@Override
	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
		setData();
		setListener();
	}

	private void initView() {
		header = getLayoutInflater().inflate(R.layout.header, null);
		swipeLayout = (RefreshLayout) findViewById(R.id.swipe_container);
		swipeLayout.setOnRefreshListener(this);
		swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
				android.R.color.holo_green_light,
				android.R.color.holo_orange_light,
				android.R.color.holo_red_light);

	}

	private void setData() {
		list = new ArrayList<HashMap<String, String>>();
		for (int i = 0; i < 20; i++) {
			list.add(new HashMap<String, String>());
		}

		listView = (ListView) findViewById(R.id.list);
		//listView.addHeaderView(header);
		adapter = new MyAdapter(this, list);
		listView.setAdapter(adapter);
	}

	private void setListener() {
		swipeLayout.setOnRefreshListener(this);
		swipeLayout.setOnLoadListener(this);
	}

	/**
	 * 下拉加载更新数据
	 */
	@Override
	public void onRefresh() {
		swipeLayout.postDelayed(new Runnable() {
			@Override
			public void run() {
				// 更新数据
				// 更新完后调用该方法结束刷新
				swipeLayout.setRefreshing(false);
			}
		}, 3000);

	}

	/**
	 * 上拉加载更新数据
	 */
	@Override
	public void onLoad() {
		swipeLayout.postDelayed(new Runnable() {

			@Override
			public void run() {
				// 更新数据
				// 更新完后调用该方法结束刷新
				swipeLayout.setLoading(false);
			}
		}, 5000);
	}

}

<RelativeLayout 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.example.swiperefreshlayoutdemo.RefreshLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/swipe_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </ListView>
    </com.example.swiperefreshlayoutdemo.RefreshLayout>

</RelativeLayout>

这里使用到了一个自定义的Swiperefreshlayout

import android.content.Context;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

/**
 * 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能.
 * 
 * @author mrsimple
 */
public class RefreshLayout extends SwipeRefreshLayout implements
		OnScrollListener {

	/**
	 * 滑动到最下面时的上拉操作
	 */

	private int mTouchSlop;
	/**
	 * listview实例
	 */
	private ListView mListView;

	/**
	 * 上拉监听器, 到了最底部的上拉加载操作
	 */
	private OnLoadListener mOnLoadListener;

	/**
	 * ListView的加载中footer
	 */
	private View mListViewFooter;

	/**
	 * 按下时的y坐标
	 */
	private int mYDown;
	/**
	 * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉
	 */
	private int mLastY;
	/**
	 * 是否在加载中 ( 上拉加载更多 )
	 */
	private boolean isLoading = false;

	/**
	 * @param context
	 */
	public RefreshLayout(Context context) {
		this(context, null);
	}

	public RefreshLayout(Context context, AttributeSet attrs) {
		super(context, attrs);

		mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

		mListViewFooter = LayoutInflater.from(context).inflate(
				R.layout.listview_footer, null, false);
	}

	@Override
	protected void onLayout(boolean changed, int left, int top, int right,
			int bottom) {
		super.onLayout(changed, left, top, right, bottom);

		// 初始化ListView对象
		if (mListView == null) {
			getListView();
		}
	}

	/**
	 * 获取ListView对象
	 */
	private void getListView() {
		int childs = getChildCount();
		if (childs > 0) {
			View childView = getChildAt(0);
			if (childView instanceof ListView) {
				mListView = (ListView) childView;
				// 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载
				mListView.setOnScrollListener(this);
				Log.d(VIEW_LOG_TAG, "### 找到listview");
			}
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
	 */
	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {
		final int action = event.getAction();

		switch (action) {
		case MotionEvent.ACTION_DOWN:
			// 按下
			mYDown = (int) event.getRawY();
			break;

		case MotionEvent.ACTION_MOVE:
			// 移动
			mLastY = (int) event.getRawY();
			break;

		case MotionEvent.ACTION_UP:
			// 抬起
			if (canLoad()) {
				loadData();
			}
			break;
		default:
			break;
		}

		return super.dispatchTouchEvent(event);
	}

	/**
	 * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.
	 * 
	 * @return
	 */
	private boolean canLoad() {
		return isBottom() && !isLoading && isPullUp();
	}

	/**
	 * 判断是否到了最底部
	 */
	private boolean isBottom() {

		if (mListView != null && mListView.getAdapter() != null) {
			return mListView.getLastVisiblePosition() == (mListView
					.getAdapter().getCount() - 1);
		}
		return false;
	}

	/**
	 * 是否是上拉操作
	 * 
	 * @return
	 */
	private boolean isPullUp() {
		return (mYDown - mLastY) >= mTouchSlop;
	}

	/**
	 * 如果到了最底部,而且是上拉操作.那么执行onLoad方法
	 */
	private void loadData() {
		if (mOnLoadListener != null) {
			// 设置状态
			setLoading(true);
			//
			mOnLoadListener.onLoad();
		}
	}

	/**
	 * @param loading
	 */
	public void setLoading(boolean loading) {
		isLoading = loading;
		if (isLoading) {
			mListView.addFooterView(mListViewFooter);
		} else {
			mListView.removeFooterView(mListViewFooter);
			mYDown = 0;
			mLastY = 0;
		}
	}

	/**
	 * @param loadListener
	 */
	public void setOnLoadListener(OnLoadListener loadListener) {
		mOnLoadListener = loadListener;
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {

	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		// 滚动时到了最底部也可以加载更多
		if (canLoad()) {
			loadData();
		}
	}

	/**
	 * 加载更多的监听器
	 * 
	 * @author mrsimple
	 */
	public static interface OnLoadListener {
		public void onLoad();
	}
}