常用的自定义ListView控件 PullToRefreshListView

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package com.zhihuibang.elivator.widget.pullrefresh;import android.content.Context;import android.util.AttributeSet;import android.view.View;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.Adapter;import android.widget.ListView;/** * 这个类实现了ListView下拉刷新，上加载更多和滑到底部自动加载 *  * @author Li Hong * @since 2013-8-15 */public class PullToRefreshListView extends PullToRefreshBase<ListView> implements OnScrollListener {        /**ListView*/    private ListView mListView;    /**用于滑到底部自动加载的Footer*/    private LoadingLayout mLoadMoreFooterLayout;    /**滚动的监听器*/    private OnScrollListener mScrollListener;        /**     * 构造方法     *      * @param context context     */    public PullToRefreshListView(Context context) {        this(context, null);    }        /**     * 构造方法     *      * @param context context     * @param attrs attrs     */    public PullToRefreshListView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }        /**     * 构造方法     *      * @param context context     * @param attrs attrs     * @param defStyle defStyle     */    public PullToRefreshListView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);                setPullLoadEnabled(false);    }    @Override    protected ListView createRefreshableView(Context context, AttributeSet attrs) {        ListView listView = new ListView(context);        mListView = listView;        listView.setOnScrollListener(this);        return listView;    }        /**     * 设置是否有更多数据的标志     *      * @param hasMoreData true表示还有更多的数据，false表示没有更多数据了     */    public void setHasMoreData(boolean hasMoreData) {        if (!hasMoreData) {            if (null != mLoadMoreFooterLayout) {                mLoadMoreFooterLayout.setState(ILoadingLayout.State.NO_MORE_DATA);            }                        LoadingLayout footerLoadingLayout = getFooterLoadingLayout();            if (null != footerLoadingLayout) {                footerLoadingLayout.setState(ILoadingLayout.State.NO_MORE_DATA);            }        }    }    /**     * 设置滑动的监听器     *      * @param l 监听器     */    public void setOnScrollListener(OnScrollListener l) {        mScrollListener = l;    }        @Override    protected boolean isReadyForPullUp() {        return isLastItemVisible();    }    @Override    protected boolean isReadyForPullDown() {        return isFirstItemVisible();    }    @Override    protected void startLoading() {        super.startLoading();                if (null != mLoadMoreFooterLayout) {            mLoadMoreFooterLayout.setState(ILoadingLayout.State.REFRESHING);        }    }        @Override    public void onPullUpRefreshComplete() {        super.onPullUpRefreshComplete();                if (null != mLoadMoreFooterLayout) {            mLoadMoreFooterLayout.setState(ILoadingLayout.State.RESET);        }    }        @Override    public void setScrollLoadEnabled(boolean scrollLoadEnabled) {        super.setScrollLoadEnabled(scrollLoadEnabled);                if (scrollLoadEnabled) {            // 设置Footer            if (null == mLoadMoreFooterLayout) {                mLoadMoreFooterLayout = new FooterLoadingLayout(getContext());            }                        if (null == mLoadMoreFooterLayout.getParent()) {                mListView.addFooterView(mLoadMoreFooterLayout, null, false);            }            mLoadMoreFooterLayout.show(true);        } else {            if (null != mLoadMoreFooterLayout) {                mLoadMoreFooterLayout.show(false);            }        }    }        @Override    public LoadingLayout getFooterLoadingLayout() {        if (isScrollLoadEnabled()) {            return mLoadMoreFooterLayout;        }        return super.getFooterLoadingLayout();    }    @Override    public void onScrollStateChanged(AbsListView view, int scrollState) {        if (isScrollLoadEnabled() && hasMoreData()) {            if (scrollState == OnScrollListener.SCROLL_STATE_IDLE                    || scrollState == OnScrollListener.SCROLL_STATE_FLING) {                if (isReadyForPullUp()) {                    startLoading();                }            }        }                if (null != mScrollListener) {            mScrollListener.onScrollStateChanged(view, scrollState);        }    }    @Override    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {        if (null != mScrollListener) {            mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);        }    }        @Override    protected LoadingLayout createHeaderLoadingLayout(Context context, AttributeSet attrs) {        return new HeaderLoadingLayout(context);    }        /**     * 表示是否还有更多数据     *      * @return true表示还有更多数据     */    private boolean hasMoreData() {        if ((null != mLoadMoreFooterLayout) && (mLoadMoreFooterLayout.getState() == ILoadingLayout.State.NO_MORE_DATA)) {            return false;        }                return true;    }        /**     * 判断第一个child是否完全显示出来     *      * @return true完全显示出来，否则false     */    private boolean isFirstItemVisible() {        final Adapter adapter = mListView.getAdapter();        if (null == adapter || adapter.isEmpty()) {            return true;        }        int mostTop = (mListView.getChildCount() > 0) ? mListView.getChildAt(0).getTop() : 0;        if (mostTop >= 0) {            return true;        }        return false;    }    /**     * 判断最后一个child是否完全显示出来     *      * @return true完全显示出来，否则false     */    private boolean isLastItemVisible() {        final Adapter adapter = mListView.getAdapter();        if (null == adapter || adapter.isEmpty()) {            return true;        }        final int lastItemPosition = adapter.getCount() - 1;        final int lastVisiblePosition = mListView.getLastVisiblePosition();        /**         * This check should really just be: lastVisiblePosition == lastItemPosition, but ListView         * internally uses a FooterView which messes the positions up. For me we'll just subtract         * one to account for it and rely on the inner condition which checks getBottom().         */        if (lastVisiblePosition >= lastItemPosition - 1) {            final int childIndex = lastVisiblePosition - mListView.getFirstVisiblePosition();            final int childCount = mListView.getChildCount();            final int index = Math.min(childIndex, childCount - 1);            final View lastVisibleChild = mListView.getChildAt(index);            if (lastVisibleChild != null) {                return lastVisibleChild.getBottom() <= mListView.getBottom();            }        }        return false;    }}
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