ExdentableListView

package snowfox.expandable;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;


public class ExpandableList extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ExpandableListView elv = (ExpandableListView)findViewById(R.id.expandableListView);


//准备一级列表中显示的数据:2个一级列表,分别显示"group1"和"group2"
List<Map<String, String>> groups = new ArrayList<Map<String, String>>();
Map<String, String> group1 = new HashMap<String, String>();
group1.put("group", "group1");
Map<String, String> group2 = new HashMap<String, String>();
group2.put("group", "group2");
groups.add(group1);
groups.add(group2);


//准备第一个一级列表中的二级列表数据:两个二级列表,分别显示"childData1"和"childData2"
List<Map<String, String>> child1 = new ArrayList<Map<String, String>>();
Map<String, String> child1Data1 = new HashMap<String, String>();
child1Data1.put("child", "child1Data1");
Map<String, String> child1Data2 = new HashMap<String, String>();
child1Data2.put("child", "child1Data2");
child1.add(child1Data1);
child1.add(child1Data2);

//准备第二个一级列表中的二级列表数据:一个二级列表,显示"child2Data1"
List<Map<String, String>> child2 = new ArrayList<Map<String, String>>();
Map<String, String> child2Data1 = new HashMap<String, String>();
child2Data1.put("child", "child2Data1");
child2.add(child2Data1);

//用一个list对象保存所有的二级列表数据
//*****************************重点值得关注的地方*******************/
List<List<Map<String, String>>> childs = new ArrayList<List<Map<String, String>>>();
//*****************************重点值得关注的地方*******************/
childs.add(child1);
childs.add(child2);


ExpandableAdapter viewAdapter = new ExpandableAdapter(this, groups, childs);
elv.setAdapter(viewAdapter);
}


//自定义的ExpandListAdapter
class ExpandableAdapter extends BaseExpandableListAdapter
{
private Context context;
List<Map<String, String>> groups;
List<List<Map<String, String>>> childs;


/*
* 构造函数:
* 参数1:context对象
* 参数2:一级列表数据源
* 参数3:二级列表数据源
*/
public ExpandableAdapter(Context context, List<Map<String, String>> groups, List<List<Map<String, String>>> childs)
{
this.groups = groups;
this.childs = childs;
this.context = context;
}


@Override
public Object getChild(int groupPosition, int childPosition)
{
return childs.get(groupPosition).get(childPosition);
}


@Override
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
}


//获取二级列表的View对象
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
ViewGroup parent)
{
@SuppressWarnings("unchecked")
String text = ((Map<String, String>) getChild(groupPosition, childPosition)).get("child");
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

//获取二级列表对应的布局文件, 并将其各元素设置相应的属性
LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(R.layout.child, null);
TextView tv = (TextView) linearLayout.findViewById(R.id.childTo);
tv.setText(text);
ImageView imageView = (ImageView)linearLayout.findViewById(R.id.imageView01);
imageView.setImageResource(R.drawable.abc);

return linearLayout;
}


@Override
public int getChildrenCount(int groupPosition)
{
return childs.get(groupPosition).size();
}


@Override
public Object getGroup(int groupPosition)
{
return groups.get(groupPosition);
}


@Override
public int getGroupCount()
{
return groups.size();
}


@Override
public long getGroupId(int groupPosition)
{
return groupPosition;
}


//获取一级列表View对象
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
String text = groups.get(groupPosition).get("group");
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

//获取一级列表布局文件,设置相应元素属性
LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(R.layout.group, null);
TextView textView = (TextView)linearLayout.findViewById(R.id.textView01);
textView.setText(text);

return linearLayout;
}


@Override
public boolean hasStableIds()
{
return false;
}


@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
return true;
}


}
}


child.xml
<?xml version="1.0" encoding="utf-8"?>


<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView android:layout_gravity="center_vertical"
android:id="@+id/imageView01" android:layout_width="70px"
android:layout_height="70px" android:paddingLeft="30px"
android:paddingTop="2px" android:paddingBottom="5px"
android:src="@drawable/abc" />
<!-- android:src = "@drawable/abc"这句话加不加口可以 -->
<TextView android:layout_gravity="center_vertical"
android:id="@+id/childTo" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="30px"
android:paddingTop="10px" android:paddingBottom="5px"
android:textSize="30sp" />
</LinearLayout>






group.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation = "horizontal"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <TextView
  android:id = "@+id/textView01"
  android:layout_width = "match_parent"
  android:layout_height = "match_parent"
  android:paddingLeft = "60px"
  android:paddingTop = "10px"
  android:paddingBottom = "10px"
  android:textSize = "26sp"/>
</LinearLayout>


main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation = "horizontal"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <TextView
  android:id = "@+id/textView01"
  android:layout_width = "match_parent"
  android:layout_height = "match_parent"
  android:paddingLeft = "60px"
  android:paddingTop = "10px"
  android:paddingBottom = "10px"
  android:textSize = "26sp"/>
</LinearLayout>