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

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