Android 关于listview

//显示到指定位置




privatevoidsetListViewPos(intpos) {

    if(android.os.Build.VERSION.SDK_INT >= 8) {

        mListView.smoothScrollToPosition(pos);

    }else{

        mListView.setSelection(pos);

    }

}







//获取Listview滚动距离

public int getScrollY() {// 获取滚动距离

        View c = listView_right.getChildAt(0);

        if (c == null) {

            return 0;

        }

        int firstVisiblePosition = listView_right.getFirstVisiblePosition();

        int top = c.getTop();

        int headerHeight = 0;

        if (firstVisiblePosition >= 1) {

            headerHeight = listView_right.getHeight();

        }

        return -top + firstVisiblePosition * c.getHeight() + headerHeight;

    }

OnscrollviewLister中的OnScroll方法中调用

//优化

@Override

 public View getView(int position, View convertView, ViewGroup parent) {

  ViewHolder viewHolder = null;

  if(convertView == null){

   LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

   convertView = inflater.inflate(R.layout.mb, null);

   viewHolder = new ViewHolder();

   viewHolder.textView = (TextView) convertView.findViewById(R.id.textView);

   convertView.setTag(viewHolder);

  }else{

   viewHolder = (ViewHolder) convertView.getTag();

  }

  viewHolder.textView.setText(list.get(position));

  return convertView;

 }

 

 static class ViewHolder{

  TextView textView;

 }