ExpandableListView 화살표 변경하기

리스트뷰의 row에 이미지뷰를 설정하고, 펼쳐질 때, 닫힐 때마다 그림을 설정하는 소스.

i use fragments.

1.frag04.xml

<?xml version="1.0" encoding="utf-8"?>
<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/exp_list"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:groupIndicator="@null">
    </ExpandableListView>
</RelativeLayout>

frist, in order to hide for orginal arrow, add android:groupIndicator="@null" 

2.parent_item.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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/rank"
            android:layout_width="40dp"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:paddingBottom="3dp"
            android:gravity="center_horizontal"
            />
        <TextView
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:textSize="29dp"
            android:textColor="#ffff8f19" />
        <TextView
            android:id="@+id/공갈"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/age"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingTop="5dp"
            android:textSize="10dp"
            android:textColor="#33000000"/>
        <TextView
            android:text = " 세"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="10dp"
            android:paddingRight="10dp"
            android:textColor="#33000000"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/flag"
            android:scaleType="fitXY"
            android:layout_width="85dp"
            android:layout_height="70dp"
            android:paddingLeft="30dp"
            />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingTop="7dp"
            android:paddingLeft="10dp">
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <TextView
                    android:id="@+id/team"
                    android:layout_width="150dp"
                    android:layout_height="wrap_content"
                    android:paddingLeft="15dp"
                    android:textSize="10dp"
                    android:textColor="#33000000" />
            </LinearLayout>
            <TextView
                android:id="@+id/position"
                android:textSize="18dp"
                android:paddingLeft="10dp"
                android:paddingTop="5dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:text="골 "
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            />
        <TextView
            android:id="@+id/goal"
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <TextView
            android:text="어시 "
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            />
        <TextView
            android:id="@+id/assist"
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <TextView
            android:text="패스 "
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            />
        <TextView
            android:id="@+id/ps"
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <TextView
            android:text="블럭 "
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            />
        <TextView
            android:id="@+id/block"
            android:textSize="18dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <TextView
            android:id="@+id/공갈레이아웃"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content" />
        <ImageView
            android:id="@+id/arrow"
            android:src="@drawable/arrowdown"
            android:scaleType="fitXY"
            android:layout_width="30dp"
            android:layout_height="30dp"/>
    </LinearLayout>


</LinearLayout>

add the ImageView instead of original arrow 

<ImageView
            android:id="@+id/arrow"
            android:src="@drawable/arrowdown"
            android:scaleType="fitXY"
            android:layout_width="30dp"
            android:layout_height="30dp"/>

and add the two image in drawable folder (arrowdown, arrowup)
    

3.ExpandListAdapter

package expandablelistview.volley.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.volley.toolbox.ImageLoader;

import org.androidtown.actionbar.R;

import java.util.ArrayList;

import expandablelistview.volley.app.MyApplication;
import expandablelistview.volley.model.Child;
import expandablelistview.volley.model.Group;

/**
 * Created by park on 2015-06-02.
 */
public class ExpandListAdapter extends BaseExpandableListAdapter {

    private Context context;
    private ArrayList<Group> groups;
    private ImageView arrow;

    ImageLoader imageLoader = MyApplication.getInstance().getImageLoader();

    public ExpandListAdapter(Context context, ArrayList<Group> groups) {
        this.context = context;
        this.groups = groups;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        ArrayList<Child> chList = groups.get(groupPosition).getItems();
        return chList.get(childPosition);
    }

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

    @Override
    public View getChildView(int groupPosition, int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {

        Child child = (Child) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) context
                    .getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.child_item, null);
        }

        if (imageLoader == null)
            imageLoader = MyApplication.getInstance().getImageLoader();

        TextView tv = (TextView) convertView.findViewById(R.id.country_name);
        ImageView iv =(ImageView) convertView.findViewById(R.id.flag2);

        tv.setText(child.getName().toString());
        iv.setImageResource(child.getImage());

        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        ArrayList<Child> chList = groups.get(groupPosition).getItems();
        return chList.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;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        Group group = (Group) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater inf = (LayoutInflater) context
                    .getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = inf.inflate(R.layout.parent_item, null);
        }
        arrow= (ImageView)convertView.findViewById(R.id.arrow);

        if (isExpanded) {
            arrow.setImageResource(R.drawable.arrowup);
        }
        else {
            arrow.setImageResource(R.drawable.arrowdown);
        }

        TextView rank = (TextView) convertView.findViewById(R.id.rank);
        TextView name = (TextView) convertView.findViewById(R.id.name);

        ImageView flag = (ImageView) convertView.findViewById(R.id.flag);
        TextView age = (TextView) convertView.findViewById(R.id.age);

        TextView team = (TextView) convertView.findViewById(R.id.team);
        TextView position = (TextView) convertView.findViewById(R.id.position);

        TextView goal = (TextView) convertView.findViewById(R.id.goal);
        TextView assist = (TextView) convertView.findViewById(R.id.assist);
        TextView ps = (TextView) convertView.findViewById(R.id.ps);
        TextView block = (TextView) convertView.findViewById(R.id.block);


        rank.setText(group.getRank());
        name.setText(group.getName());

        flag.setImageResource(group.getFlag());
        age.setText(group.getAge());

        team.setText(group.getTeam());
        position.setText(group.getPosition());

        goal.setText(group.getGoal());
        assist.setText(group.getAssist());
        ps.setText(group.getPs());
        block.setText(group.getBlock());

        return convertView;
    }

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

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

}

in public View getGroupView 

add the line

arrow= (ImageView)convertView.findViewById(R.id.arrow);

if (isExpanded) {
    arrow.setImageResource(R.drawable.arrowup);
}
else {
    arrow.setImageResource(R.drawable.arrowdown);
}

4.finish