可扩展的listview

1.布局文件中使用：<ExpandableListView 
    android:id="@+id/el"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ></ExpandableListView>
2.代码中使用
    el = (ExpandableListView) findViewById(R.id.el);
    el.setAdapter(new Myadapter());

3.adapter
    private class Myadapter extends BaseExpandableListAdapter {
        // 设置组的个数
        @Override
        public int getGroupCount() {
            // TODO Auto-generated method stub
            return 8;
        }

        // 设置每组有多少孩子
        // groupPosition : 组的位置标示
        @Override
        public int getChildrenCount(int groupPosition) {
            // TODO Auto-generated method stub
            return groupPosition+1;
        }

        // 设置组的样式
        //groupPosition : 组的位置
        //isExpanded　：是否可以扩展
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            TextView textView = new TextView(getApplicationContext());
            textView.setText("              第"+groupPosition+"组");
            return textView;
        }

        // 设置组的孩子的样式
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            TextView textView = new TextView(getApplicationContext());
            textView.setText("我是第"+groupPosition+"组的第"+childPosition+"个孩子");
            textView.setTextColor(Color.RED);
            return textView;
        }

        // 获取组对应的数据
        @Override
        public Object getGroup(int groupPosition) {
            // TODO Auto-generated method stub
            return null;
        }

        // 获取组的孩子对应的数据
        // groupPosition : 组的位置
        // childPosition : 孩子的位置
        @Override
        public Object getChild(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return null;
        }

        // 获取组的id
        @Override
        public long getGroupId(int groupPosition) {
            // TODO Auto-generated method stub
            return 0;
        }

        // 获取组的孩子的id
        @Override
        public long getChildId(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return 0;
        }

        // 判断id是否稳定，判断有没有设置id,有true,没有false
        @Override
        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return false;
        }

        // 设置孩子是否可以点击 true:可以，false:不可以
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return false;
        }

    }