ExpandableListView设置选中child的背景

转自：http://blog.csdn.net/hknock/article/details/12914915

 xml version="1.0" encoding="UTF-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="@drawable/ract_bg"
     android:orientation="vertical" >

     <ExpandableListView
         android:id="@+id/listview"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:childDivider="#885D7081"
         android:choiceMode="singleChoice"
         android:divider="#88455869"
         android:dividerHeight="1px"
         android:groupIndicator="@null"
         android:listSelector="#00000000"
         android:scrollingCache="false" />

 LinearLayout>

说明：需要定义android:listSelector="#00000000"关闭点击的效果，android:choiceMode="singleChoice"设为单选模式

charge_expandable_fragment_group_item.xml

 xml version="1.0" encoding="UTF-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="60dp"
     android:background="#88506475"
     android:gravity="center_vertical"
     android:minHeight="60dp"
     android:orientation="horizontal" >

     <ImageView
         android:id="@+id/group_indicator"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginLeft="10dp"
         android:layout_marginRight="10dp"
         android:src="@drawable/expander_arrow_collapse" />

     <TextView
         android:id="@+id/group_textview"
         style="@style/WhiteLargeNormalStyle"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:gravity="left|center_vertical"
         android:text="父元素" />

 LinearLayout>

charge_expandable_fragment_child_item.xml

 xml version="1.0" encoding="UTF-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="80dp"
     android:background="@drawable/selector_expandable_child_item"
     android:gravity="center_vertical"
     android:minHeight="80dp"
     android:orientation="horizontal" >

     <TextView
         android:id="@+id/child_textview"
         style="@style/WhiteLargeNormalStyle"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_weight="1"
         android:gravity="left|center_vertical"
         android:text="子元素" />

     <ImageView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginRight="5dp"
         android:src="@drawable/arrow_right" />

 LinearLayout>

selector_expandable_child_item.xml

 xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">

     <item android:drawable="@drawable/child_item2" android:state_activated="true"/>
     <item android:drawable="@drawable/child_item1"/>

 selector>

代码部分：

 final private ExpandableListView.OnChildClickListener mOnClickListener = new ExpandableListView.OnChildClickListener() {

     @Override
     public boolean onChildClick(ExpandableListView parent, View v,
             int groupPosition, int childPosition, long id) {
         // 设置选中背景
         setItemChecked(groupPosition, childPosition);
         // TODO 执行选中后的操作
         return true;
     }
 };

 private void setItemChecked(int groupPosition, int childPosition) {
     if (mListView == null) {
         return;
     }

     this.mGroupPosition = groupPosition;
     this.mChildPosition = childPosition;

     int numberOfGroupThatIsOpened = 0;
     for (int i = 0; i < groupPosition; i++) {
         if (mListView.isGroupExpanded(i)) {
             numberOfGroupThatIsOpened += mAdapter.getChildrenCount(i);
         }
     }
     int position = numberOfGroupThatIsOpened + groupPosition
             + childPosition + 1;
     System.out.println("groupPosition=" + groupPosition
             + ", childPosition=" + childPosition + ", position="
             + position + ", isItemChecked="
             + mListView.isItemChecked(position));
     if (!mListView.isItemChecked(position)) {
         mListView.setItemChecked(position, true);
     }
 }

 @Override
 public View getGroupView(int groupPosition, boolean isExpanded,
         View convertView, ViewGroup parent) {
     if (convertView == null) {
         convertView = mInflater.inflate(
                 R.layout.charge_expandable_fragment_group_item,
                 null);
     }
     ImageView indicator = (ImageView) convertView
             .findViewById(R.id.group_indicator);
     if (isExpanded) {
         // 设置展开后的group标头图片
         indicator
                 .setImageResource(R.drawable.expander_arrow_expand);
         // 在折叠后再次展开，之前的选中会消失，此处需要设置一次
         if (groupPosition == mGroupPosition) {
             setItemChecked(mGroupPosition, mChildPosition);
         }
     } else {
         // 折叠后的group标头图片
         indicator
                 .setImageResource(R.drawable.expander_arrow_collapse);
     }
     TextView text = (TextView) convertView
             .findViewById(R.id.group_textview);
     text.setText(groups[groupPosition]);
     return convertView;
 }