How to get Clicked selected item from ExpandableListView in android using setOnChildClickListener.
ExpandableListView is a type of drop down list view including sub child elements included in it. On this type of list view there is setOnChildClickListener() function used at the place of onclicklistener(). So here is the complete step by step tutorial for Set onclicklistener function on ExpandableListView android .
How to use Set onclicklistener function on ExpandableListView android .
Code for MainActivity.java file.
package com.android_examples.com.expandablelistview;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.Toast;
public class MainActivity extends Activity {
List<String> ChildList;
Map<String, List<String>> ParentListItems;
ExpandableListView expandablelistView;
// Assign Parent list items here.
List<String> ParentList = new ArrayList<String>();
{ ParentList.add("ANDROID");
ParentList.add("PHP");
ParentList.add("BLOGGER");
ParentList.add("PHOTOSHOP");
ParentList.add("WORDPRESS");
ParentList.add("SEO"); }
// Assign children list element using string array.
String[] AndroidName = { "ANDROID STUDIO","ANDROID EXAMPLES","ANDROID TUTORIALS" };
String[] PhpName = { "XAMPP","PHPMYADMIN","MYSQL" };
String[] BloggerName = { "BLOG NAME","SUB DOMAIN NAME","BLOGGER" };
String[] PhotoshopName = { "COLOR TOOL","MOVE TOOL","CROP TOOL" };
String[] WordPressName = { "LOGIN","ADD NEW POST","PLUGINS" };
String[] SEOName = { "SEARCH","ENGINE","OPTIMIZATION" };
String[] ByDefalutMessage = {"Items Loading"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ParentListItems = new LinkedHashMap<String, List<String>>();
for ( String HoldItem : ParentList) {
if (HoldItem.equals("ANDROID")) {
loadChild(AndroidName);
} else if (HoldItem.equals("PHP"))
loadChild(PhpName);
else if (HoldItem.equals("BLOGGER"))
loadChild(BloggerName);
else if (HoldItem.equals("PHOTOSHOP"))
loadChild(PhotoshopName);
else if (HoldItem.equals("WORDPRESS"))
loadChild(WordPressName);
else if (HoldItem.equals("SEO"))
loadChild(SEOName);
else
loadChild(ByDefalutMessage);
ParentListItems.put(HoldItem, ChildList);
}
expandablelistView = (ExpandableListView) findViewById(R.id.expandableListView1);
final ExpandableListAdapter expListAdapter = new ListAdapter(
this, ParentList, ParentListItems);
expandablelistView.setAdapter(expListAdapter);
expandablelistView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
final String selected = (String) expListAdapter.getChild(
groupPosition, childPosition);
Toast.makeText(getBaseContext(), selected, Toast.LENGTH_LONG)
.show();
return true;
}
});
}
private void loadChild(String[] ParentElementsName) {
ChildList = new ArrayList<String>();
for (String model : ParentElementsName)
ChildList.add(model);
}
}
Code for ListAdapter.java file.
package com.android_examples.com.expandablelistview;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class ListAdapter extends BaseExpandableListAdapter {
private Activity context;
private Map<String, List<String>> ParentListItems;
private List<String> Items;
public ListAdapter(Activity context, List<String> Items,
Map<String, List<String>> ParentListItems) {
this.context = context;
this.ParentListItems = ParentListItems;
this.Items = Items;
}
public Object getChild(int groupPosition, int childPosition) {
return ParentListItems.get(Items.get(groupPosition)).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View ListView, ViewGroup parent) {
final String CoursesName = (String) getChild(groupPosition, childPosition);
LayoutInflater inflater = context.getLayoutInflater();
if (ListView == null) {
ListView = inflater.inflate(R.layout.child_list_item, null);
}
TextView item = (TextView) ListView.findViewById(R.id.textView1);
item.setText(CoursesName);
return ListView;
}
public int getChildrenCount(int groupPosition) {
return ParentListItems.get(Items.get(groupPosition)).size();
}
public Object getGroup(int groupPosition) {
return Items.get(groupPosition);
}
public int getGroupCount() {
return Items.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded,
View ListView, ViewGroup parent) {
String CoursesFull = (String) getGroup(groupPosition);
if (ListView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ListView = infalInflater.inflate(R.layout.parent_list_item,null);
}
TextView item = (TextView) ListView.findViewById(R.id.textView1);
item.setText(CoursesFull);
return ListView;
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
Code for activity_main.xml file.
<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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.android_examples.com.expandablelistview.MainActivity" > <ExpandableListView android:id="@+id/expandableListView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" > </ExpandableListView> </RelativeLayout>
Code for parent_list_item.xml layout file.
<?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" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Medium Text" android:textAppearance="?android:attr/textAppearanceMedium" android:padding="30dp" /> </LinearLayout>
Code for child_list_item.xml layout file.
<?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="40dp" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Medium Text" android:textAppearance="?android:attr/textAppearanceMedium" /> </LinearLayout>
Screenshot:
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