请教一下，ExpandableListView无法显示的问题

[youyuan1980]

主界面

list=(ExpandableListView)findViewById(R.id.list);
List<String> GroupList=new ArrayList<String>();
		List<List<String>> childs = new ArrayList<List<String>>();
		GroupList.add("第一项");
		GroupList.add("第二项");
		
		List<String> itemList1=new ArrayList<String>();
		itemList1.add("第一项第一行");
		itemList1.add("第一项第二行");
		childs.add(itemList1);
		
		List<String> itemList2=new ArrayList<String>();
		itemList2.add("第二项第一行");
		itemList2.add("第二项第二行");
		childs.add(itemList2);
		list.setAdapter(new MyExpandableListAdapter(GroupList,childs,MainActivity.this));
		

自定义适配器代码

class MyExpandableListAdapter extends BaseExpandableListAdapter
	{
		private List<String> GroupList=null;
		private List<List<String>> childs=null; 
		private Context mContext=null;
		public MyExpandableListAdapter(List<String> groupList,
				List<List<String>> childs,Context context) {
			super();
			GroupList = groupList;
			this.childs = childs;
			this.mContext=context;
		}


		@Override
		public Object getChild(int groupPosition,
				int childPosition) {
			// TODO Auto-generated method stub
			return childs.get(groupPosition).get(childPosition);
		}

		@Override
		public long getChildId(int groupPosition,
				int childPosition) {
			// TODO Auto-generated method stub
			return childPosition;
		}

		@Override
		public int getChildrenCount(int groupPosition) {
			// TODO Auto-generated method stub
			return childs.get(groupPosition).size();
		}

		@Override
		public Object getGroup(int groupPosition) {
			// TODO Auto-generated method stub
			return GroupList.get(groupPosition);
		}

		@Override
		public int getGroupCount() {
			// TODO Auto-generated method stub
			return GroupList.size();
		}

		@Override
		public long getGroupId(int groupPosition) {
			// TODO Auto-generated method stub
			return groupPosition;
		}

		@Override
		public View getGroupView(int groupPosition,
				boolean isExpanded, View convertView,
				ViewGroup parent) {
			// TODO Auto-generated method stub
			if(convertView==null)
			{
				LayoutInflater _Layoutinflater=LayoutInflater.from(mContext);
				convertView=_Layoutinflater.inflate(R.layout.groups,null);
				TextView grouptext=(TextView)convertView.findViewById(R.id.textGroup);
				grouptext.setText(getGroup(groupPosition).toString());
			}
			return convertView;
		}
		
		@Override
		public View getChildView(int groupPosition,
				int childPosition, boolean isLastChild,
				View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			if(convertView==null)
			{
				LayoutInflater _Layoutinflater=LayoutInflater.from(mContext);
				convertView=_Layoutinflater.inflate(R.layout.childs,null);
				TextView childtext=(TextView)convertView.findViewById(R.id.textChild);
				Log.i("my", getChild(groupPosition, childPosition).toString());
				childtext.setText(getChild(groupPosition, childPosition).toString());
			}
			return convertView;
		}

		@Override
		public boolean hasStableIds() {
			// TODO Auto-generated method stub
			return true;
		}

		@Override
		public boolean isChildSelectable(int groupPosition,
				int childPosition) {
			// TODO Auto-generated method stub
			return true;
		}
		
	};

主界面布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
	android:orientation="horizontal"
    tools:context=".MainActivity" >
	 <ExpandableListView 
	 	android:id="@+id/list"
	 	android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:background="#ffffff" 
	/>
</LinearLayout>

组布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
     <TextView
        android:id="@+id/textGroup"
     	android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="9pt"
        android:textColor="#000000"
        />
</LinearLayout>

子布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
     <TextView
        android:id="@+id/textChild"
     	android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:textSize="15sp"
        />
</LinearLayout>

调试下来都有值，在getview里面也有值，就是在主界面上显示不出来，请高手看一下。。

[youyuan1980]

顶一下。。请高手解答一下。

[youyuan1980]

在单位试了一下，可以运行的，奇怪了，可能和环境有关系。