Android ExpandableListView简单例子

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android中常常要用到ListView，有时也要用到ExpandableListView，如在手机设置中，对于分类有很好的效果，会用ListView的人一定会用ExpandableListView，因为
ExpandableListView extends ListView的，下面来看个简单的例子

运行效果图：

Android ExpandableListView简单例子

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<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"
    tools:context=".MainActivity">
 
    <ExpandableListView
        android:id="@+id/expendlist"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ExpandableListView>
 
 </RelativeLayout>

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//扩展ListView的头List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="wrap_content"
 android:orientation="horizontal">
 
 <TextView
  android:id="@+id/txt"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"/>
 
 <ImageView
  android:id="@+id/img"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"/>
</LinearLayout>

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//扩展ListView的子List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="horizontal"
 android:padding="10.0dp">
 
 <ImageView
  android:id="@+id/img"
  android:layout_width="20.0dp"
  android:layout_height="20.0dp"/>
 
 <TextView
  android:id="@+id/txt"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"/>
 
</LinearLayout>

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packagecom.example.test;
 
 importjava.util.ArrayList;
 importjava.util.List;
 
 importandroid.app.Activity;
 importandroid.content.Context;
 importandroid.os.Bundle;
 importandroid.view.View;
 importandroid.view.ViewGroup;
 importandroid.widget.BaseExpandableListAdapter;
 importandroid.widget.ExpandableListView;
 importandroid.widget.ImageView;
 importandroid.widget.TextView;
 
 publicclass MainActivity extendsActivity {
 
 privateExpandableListView expandableListView;
 privateList<String> group_list;
 privateList<List<String>> item_list;
 privateList<List<Integer>> item_list2;
 
 @Override
 protectedvoid onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 
  //随便一堆测试数据
  group_list = newArrayList<String>();
  group_list.add("A");
  group_list.add("B");
  group_list.add("C");
 
  item_list = newArrayList<List<String>>();
  item_list.add(group_list);
  item_list.add(group_list);
  item_list.add(group_list);
 
  List<Integer> tmp_list = newArrayList<Integer>();
  tmp_list.add(R.drawable.ic_launcher);
  tmp_list.add(R.drawable.ic_launcher);
  tmp_list.add(R.drawable.ic_launcher);
 
  item_list2 = newArrayList<List<Integer>>();
  item_list2.add(tmp_list);
  item_list2.add(tmp_list);
  item_list2.add(tmp_list);
 
  expandableListView = (ExpandableListView) findViewById(R.id.expendlist);
  expandableListView.setAdapter(newMyExpandableListViewAdapter(this));
 }
 
 //用过ListView的人一定很熟悉，只不过这里是BaseExpandableListAdapter
 classMyExpandableListViewAdapter extendsBaseExpandableListAdapter {
 
  privateContext context;
 
  publicMyExpandableListViewAdapter(Context context) {
   this.context = context;
  }
 
  @Override
  publicint getGroupCount() {
   returngroup_list.size();
  }
 
  @Override
  publicint getChildrenCount(intgroupPosition) {
   returnitem_list.get(groupPosition).size();
  }
 
  @Override
  publicObject getGroup(intgroupPosition) {
   returngroup_list.get(groupPosition);
  }
 
  @Override
  publicObject getChild(intgroupPosition, intchildPosition) {
   returnitem_list.get(groupPosition).get(childPosition);
  }
 
  @Override
  publiclong getGroupId(intgroupPosition) {
   returngroupPosition;
  }
 
  @Override
  publiclong getChildId(intgroupPosition, intchildPosition) {
   returnchildPosition;
  }
 
  @Override
  publicboolean hasStableIds() {
   returntrue;
  }
 
  @Override
  publicView getGroupView(intgroupPosition, booleanisExpanded,
    View convertView, ViewGroup parent) {
   GroupHolder groupHolder = null;
   if(convertView == null) {
    convertView = (View) getLayoutInflater().from(context).inflate(
      R.layout.expendlist_group, null);
    groupHolder = newGroupHolder();
    groupHolder.txt = (TextView) convertView.findViewById(R.id.txt);
    // groupHolder.img = (ImageView) convertView
    // .findViewById(R.id.img);
    convertView.setTag(groupHolder);
   } else{
    groupHolder = (GroupHolder) convertView.getTag();
   }
   groupHolder.txt.setText(group_list.get(groupPosition));
   returnconvertView;
  }
 
  @Override
  publicView getChildView(intgroupPosition, intchildPosition,
    booleanisLastChild, View convertView, ViewGroup parent) {
   ItemHolder itemHolder = null;
   if(convertView == null) {
    convertView = (View) getLayoutInflater().from(context).inflate(
      R.layout.expendlist_item, null);
    itemHolder = newItemHolder();
    itemHolder.txt = (TextView) convertView.findViewById(R.id.txt);
    itemHolder.img = (ImageView) convertView.findViewById(R.id.img);
    convertView.setTag(itemHolder);
   } else{
    itemHolder = (ItemHolder) convertView.getTag();
   }
   itemHolder.txt.setText(item_list.get(groupPosition).get(
     childPosition));
   itemHolder.img.setBackgroundResource(item_list2.get(groupPosition).get(
     childPosition));
   returnconvertView;
  }
 
  @Override
  publicboolean isChildSelectable(intgroupPosition, intchildPosition) {
   returntrue;
  }
 
 }
 
 classGroupHolder {
  publicTextView txt;
  publicImageView img;
 }
 
 classItemHolder {
  publicImageView img;
  publicTextView txt;
 }
}

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