android的ListView点击item使item展开的做法的实现代码

本文介绍了android的listview点击item使item展开的做法的实现代码，分享给大家，具体如下：

效果图:

原理是点击item的时候,重新measure list的各个item的高度

list.setonitemclicklistener(new onitemclicklistener() {
 
  @override
  public void onitemclick(adapterview<?> parent, view view, int position, long id) {
   mydata data = mylist.get(position);
   if (oldpostion == position) {
     if (data.expand) {
      oldpostion = -1;
     }
     data.expand = !data.expand;
   }else{
     oldpostion = position;
     data.expand = true;
   }
    
   int totalheight = 0;
   for(int i=0;i<myadapter.getcount();i++) {
     view viewitem = myadapter.getview(i, null, list);
     viewitem.measure(0, 0);
     totalheight += viewitem.getmeasuredheight();
   }
    
   viewgroup.layoutparams params = list.getlayoutparams();
   params.height = totalheight
      + (list.getdividerheight() * (list.getcount() - 1));
   list.setlayoutparams(params);
   myadapter.notifydatasetchanged();
  }
});

adapter:

private class myadapter extends baseadapter{
 
  @override
  public int getcount() {
   return mylist.size();
  }
 
  @override
  public object getitem(int position) {
   return mylist.get(position);
  }
 
  @override
  public long getitemid(int position) {
   return position;
  }
 
  @override
  public view getview(int position, view convertview, viewgroup parent) {
    
   mytag tag = new mytag();
   mydata data = mylist.get(position);
   if(convertview == null) {
     convertview = inflater.inflate(r.layout.expand_item_layout, null);
     tag.item1 = (textview)convertview.findviewbyid(r.id.item1);
     tag.item2 = (relativelayout)convertview.findviewbyid(r.id.item2);
     convertview.settag(tag);
   }else{
     tag = (mytag)convertview.gettag();
   }
   if(data.expand) {
     tag.item2.setvisibility(view.visible);
   }else{
     tag.item2.setvisibility(view.gone);
   }
    
   tag.item1.settext(data.name);
   return convertview;
  }
  
}
 
private class mytag{
  private textview item1;
  private relativelayout item2;
}
 
private class mydata{
  boolean expand;
  string name;
}

代码在https://github.com/nickgao1986/stepsport

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。