Expandable

main.xml

<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/expan_list"
        android:layout_width="match_parent"
        android:layout_height="fill_parent" >
    </ExpandableListView>
</RelativeLayout>

child_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="10dp" > 
    <TextView
        android:id="@+id/child_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:paddingLeft="25dp" />
    <ImageView
        android:id="@+id/delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:src="@drawable/ic_launcher"
        android:contentDescription="@string/app_name"/>
</RelativeLayout>

group_list.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:padding="10dp" >
    <TextView
        android:id="@+id/group_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="25dp"/>
</LinearLayout>

MyExpandableListAdapter.java

import java.util.List;
import java.util.Map;
import com.example.myproject.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class MyExpandableListAdapter extends BaseExpandableListAdapter {


private Activity mContext;
private Map<String, List<String>> collections; // 数据源
private List<String> groupItems; // 组名称


public MyExpandableListAdapter(Activity context,
Map<String, List<String>> mCollections, List<String> mGroupItems) {
this.mContext = context;
this.collections = mCollections;
this.groupItems = mGroupItems;
}


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


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


@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childName = (String) getChild(groupPosition, childPosition);
LayoutInflater inflater = mContext.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.child_list, null);
}
TextView childItem = (TextView) convertView
.findViewById(R.id.child_name);
ImageView delete = (ImageView) convertView.findViewById(R.id.delete);
delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setMessage("Do you want to remove?");
builder.setCancelable(false);
builder.setTitle("Warning");
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
List<String> child = collections.get(groupItems
.get(groupPosition));
child.remove(childPosition);
notifyDataSetChanged();
}
});
builder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.cancel();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
});
childItem.setText(childName);
return convertView;
}


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


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


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


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


@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
final String groupName = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater inflater = mContext.getLayoutInflater();
convertView = inflater.inflate(R.layout.group_list, null);
}
TextView groupItem = (TextView) convertView
.findViewById(R.id.group_name);
groupItem.setTypeface(null, Typeface.BOLD);
groupItem.setText(groupName);
return convertView;
}


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


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


}

MainActivity.java

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.example.myproject.adapter.MyExpandableListAdapter;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.Toast;


public class MainActivity extends Activity {
private ExpandableListView expanListView;
private MyExpandableListAdapter adapter;
private Map<String, List<String>> collections;
private List<String> groupCollection;
private List<String> childCollection;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initGroupCollection();
initCollections();
expanListView = (ExpandableListView) findViewById(R.id.expan_list);
adapter = new MyExpandableListAdapter(MActivity.this, collections,
groupCollection);
expanListView.setAdapter(adapter);
expanListView.setOnChildClickListener(new OnChildClickListener() {


@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
final String selected = (String) adapter.getChild(
groupPosition, childPosition);
Toast.makeText(MActivity.this, selected, Toast.LENGTH_SHORT)
.show();
return true;
}


});
}


public void initGroupCollection() {
groupCollection = new ArrayList<String>();
groupCollection.add("湖南");
groupCollection.add("广东");
groupCollection.add("江西");
groupCollection.add("四川");
}


public void initCollections() {
String[] hunanCities = { "长沙", "岳阳", "株洲", "永州" };
String[] guangdongCities = { "广州", "深圳", "珠海", "东莞" };
String[] jiangxiCities = { "南昌", "九江", "宜春", "鹰潭" };
String[] sichuangCities = { "成都", "乐山", "达州", "内江" };
collections = new LinkedHashMap<String, List<String>>();
for (String groupName : groupCollection) {
if (groupName.equals("湖南")) {
loadChildItems(hunanCities);
} else if (groupName.equals("广东")) {
loadChildItems(guangdongCities);
} else if (groupName.equals("江西")) {
loadChildItems(jiangxiCities);
} else if (groupName.equals("四川")) {
loadChildItems(sichuangCities);
}
collections.put(groupName, childCollection);
}
}


public void loadChildItems(String[] cities) {
childCollection = new ArrayList<String>();
for (String city : cities) {
childCollection.add(city);
}
}


}