TBListView.java

package com.yuyh.library.view.list;

import android.content.Context;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

import com.yuyh.library.view.listener.OnLoadMoreListener;

/**
 * 判断滑动到底部Listview,可用于拉到底部自动触发加载更多
 *
 * @author yuyh.
 * @date 16/4/10.
 */
public abstract class TBListView extends ListView implements
        OnScrollListener {

    protected Context mContext;
    protected LayoutInflater mInflater;
    protected int mFirstVisibleItem;
    protected boolean mIsTop;
    protected boolean mIsBottom;
    protected OnLoadMoreListener onLoadMoreListener;

    protected Point mDownPoint;
    protected Point mMovePoint;
    protected Point mUpPoint;

    public TBListView(Context context) {
        this(context, null);
    }

    public TBListView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TBListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    private void init(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        setOnScrollListener(this);
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
                         int visibleItemCount, int totalItemCount) {
        mFirstVisibleItem = firstVisibleItem;
        if (view.getFirstVisiblePosition() == 1) {
            mIsTop = true;
            // 滑动到顶部
        } else if (onLoadMoreListener != null && view.getLastVisiblePosition() == view.getCount() - 1) {
            mIsBottom = true;
            onLoadMoreListener.onLoadMore();
            // 滑动到底部
        } else {
            mIsTop = false;
            mIsBottom = false;
        }
    }

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

    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        int action = ev.getAction();
        int x = 0;
        int y = 0;
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                x = (int) ev.getX();
                y = (int) ev.getY();
                mDownPoint = new Point(x, y);
                onDown(ev);
                break;

            case MotionEvent.ACTION_MOVE:
                x = (int) ev.getX();
                y = (int) ev.getY();
                mMovePoint = new Point(x, y);
                onMove(ev);
                break;

            case MotionEvent.ACTION_UP:
                x = (int) ev.getX();
                y = (int) ev.getY();
                mUpPoint = new Point(x, y);
                onUp(ev);
                break;
        }
        return super.onTouchEvent(ev);
    }

    public abstract void onDown(MotionEvent ev);

    public abstract void onMove(MotionEvent ev);

    public abstract void onUp(MotionEvent ev);

    public OnLoadMoreListener getOnLoadMoreListener() {
        return onLoadMoreListener;
    }

    public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
        this.onLoadMoreListener = onLoadMoreListener;
    }

}