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

代码语言：javascript复制

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:

代码语言：javascript复制

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。

android listview adapter list 原理

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