android之ExpandableListView 的滑动到底部的精确监听事件

1.给expandableListView 监听滑动到最底部的事件。最传统的方法不适合。

// 监听listview滚到最底部
expandableListView.setOnScrollListener(new OnScrollListener() {
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        switch (scrollState) {
            // 当不滚动时
            case OnScrollListener.SCROLL_STATE_IDLE:
                // 判断滚动到底部
                if (view.getLastVisiblePosition() == (view.getCount() - 1)) {
                   //TODO
              }
              break;
        }
    }
 
    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
           int visibleItemCount, int totalItemCount) {
    }
});

2.第二种方法，网上搜到的。虽然这个方法没解决我的问题，却给了我很大灵感。用了全局坐标来定位。

参考URL:http://www.oschina.net/question/234345_44392

import android.util.Log;  
import android.view.View;  
import android.widget.AbsListView;  
import android.widget.Toast;  
import android.widget.AbsListView.OnScrollListener;  
/** 
 * 滚动至列表底部，读取下一页数据 
 */  
public class AutoLoadListener implements OnScrollListener{  
  
    public interface AutoLoadCallBack {  
        void execute(String url);  
    }  
  
    private int getLastVisiblePosition = 0,lastVisiblePositionY=0;  
    private AutoLoadCallBack  mCallback;  
    public AutoLoadListener(AutoLoadCallBack callback)  
    {  
        this.mCallback = callback;  
    }  
      
    public void onScrollStateChanged(AbsListView view, int scrollState) {  
  
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {  
            //滚动到底部  
            if (view.getLastVisiblePosition() == (view.getCount() - 1)) {  
                View v=(View) view.getChildAt(view.getChildCount()-1);  
                int[] location = new  int[2] ;  
                v.getLocationOnScreen(location);//获取在整个屏幕内的绝对坐标  
                int y=location [1];  
  
                Log.e("x"+location[0],"y"+location[1]);  
                if (view.getLastVisiblePosition()!=getLastVisiblePosition  
                        && lastVisiblePositionY!=y)//第一次拖至底部  
                {  
                    Toast.makeText(view.getContext(), "再次拖至底部，即可翻页",500).show();  
                    getLastVisiblePosition=view.getLastVisiblePosition();  
                    lastVisiblePositionY=y;  
                    return;  
                }  
                else if (view.getLastVisiblePosition()==getLastVisiblePosition  
                        && lastVisiblePositionY==y)//第二次拖至底部  
                {  
                    mCallback.execute(">>>>>拖至底部");  
                }  
            }  
              
            //未滚动到底部，第二次拖至底部都初始化  
            getLastVisiblePosition=0;     
            lastVisiblePositionY=0;  
        }  
    }  
  
    public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {  
          
    }  
}  

3.我参考精确坐标，我用了相对坐标。

• 先算出了除却标题与状态栏的屏幕高度，即ExpandableListView所占屏幕的高度；

    titleBarHeight = Util.dip2px(48);
    Rect frame = new Rect();
    getActivity().getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
    statusBarHeight = frame.top;
    otherHeight = DeviceInfo.HEIGHT - titleBarHeight - statusBarHeight;

• 然后ExpandableListView滑动到最底部时，ExpandableListView离最屏幕底部是一个定值，我用的pad分辨率为1024*600.这个宣传即是490；

phoneExSearchList.setOnScrollListener(new OnScrollListener() {

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                Logger.d(tag, "onScrollStateChanged... ..." + scrollState);
                if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
                    Logger.d(tag, "getLastVisiblePosition... ..." + view.getLastVisiblePosition()
                            + "-" + (view.getCount() - 1));
                    if (view.getLastVisiblePosition() == (view.getCount() - 1)) {
                        Logger.d(tag, "DeviceInfo.HEIGHT - " + DeviceInfo.HEIGHT);
                        Logger.d(tag, "DeviceInfo.WIDTH - " + DeviceInfo.WIDTH);
                        if (Math.abs(otherHeight - v.getBottom()) < 5) {
                            if (Util.isGoOn("onscroll", 800)) {
                                mhandler.sendEmptyMessage(SearchTudouResultFragment.GET_SEARCH_PAGE_TURN);
                            }
                        }
                    }
                }

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                    int totalItemCount) {
            }
        });