ExpandableListView 사용법 (작성중 )

ExpandableListView는 목록을 계층(접었다 폈다)으로 표시할 수 있는  ListView

 

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XML

<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <ExpandableListView
        android:id="@+id/expandableListView"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:indicatorLeft="?android:attr/expandableListPreferredItemIndicatorLeft"
        android:divider="@android:color/darker_gray"
        android:dividerHeight="0.5dp" />

</RelativeLayout>

 

 

Adapter 

package com.gitsn.study_dp.Adpaters;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
import com.gitsn.study_dp.Model.Base_info;
import com.gitsn.study_dp.R;
import java.util.ArrayList;

public class CustomExpandableListAdapter extends BaseExpandableListAdapter {

    private Context context;
    private ArrayList<String> expandableListTitle;
    private ArrayList<Base_info> expandableListDetail;

    public CustomExpandableListAdapter(Context context, ArrayList<String> expandableListTitle,
                                       ArrayList<Base_info> expandableListDetail) {
        this.context = context;
        this.expandableListTitle = expandableListTitle;
        this.expandableListDetail = expandableListDetail;
    }

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

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

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

        final String expandedListText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) this.context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.item_info, null);
        }

        TextView expandedListTextView = (TextView) convertView.findViewById(R.id.expandedListItem);
        expandedListTextView.setText(expandedListText);
        return convertView;
    }

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

    //------------------------------------------------------------------------------------------------

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        String listTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.item_category, null);
        }

        TextView listTitleTextView = (TextView) convertView.findViewById(R.id.listTitle);
        listTitleTextView.setTypeface(null, Typeface.BOLD);
        listTitleTextView.setText(listTitle);

        return convertView;
    }

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

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

 

 

MainActivity 

    void setAdapter(){

        expandableListAdapter = new CustomExpandableListAdapter(this, categoryList, infoArrayList);
        expandableListView.setAdapter(expandableListAdapter);
        expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {

            }
        });

        expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
            @Override
            public void onGroupCollapse(int groupPosition) {

            }
        });

        expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                                        int groupPosition, int childPosition, long id) {

                return false;
            }
        });
    }

 

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출처 및 참고 : https://www.digitalocean.com/community/tutorials/android-expandablelistview-example-tutorial

Android ExpandableListView Example Tutorial | DigitalOcean

 

https://blog.naver.com/javaking75/220843402180

[안드로이드] ExpandableListView - 목록을 계층으로 표시하기