android开发中，会遇见分类下面还有小分类的情况，这个可以很简单的用ExpandableListView来实现.
截图如下：
实现代码：主界面,main.java
适配器：AllAdpter
xml:
<?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"
android:background="#EBEBEB"
>
<TextView
android:gravity="center_vertical"
android:paddingLeft="25dp"
android:textColor="#000000"
android:layout_width="fill_parent"
android:layout_height="45dp"
android:textSize="16sp"
android:id="@+id/all_list_text_item_id"
/>
</LinearLayout>
<?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:gravity="center_vertical"
android:textColor="#000000"
android:paddingLeft="3dp"
android:layout_width="fill_parent"
android:layout_height="35dp"
android:textSize="20sp"
android:id="@+id/all_list_text_id"
/>
</LinearLayout>
<RelativeLayout 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:background="#ffffff"
>
<ExpandableListView
android:paddingLeft="3dp"
android:cacheColorHint="#00000000"
android:groupIndicator="@null"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/all"
/>
</RelativeLayout>