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14:39
In this tutorial explain how to used expendable listView in android.
main.xml
In this class drag and drop expendableListView widget.
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#4079d6" >
<ExpandableListView
android:id="@+id/lvExp"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
</LinearLayout>
list_group.xml
the another group item header xml class.
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp"
android:background="#000000">
<TextView
android:id="@+id/lblListHeader"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
android:textSize="17dp"
android:textColor="#f9f93d" />
</LinearLayout>
list_item.xml
create a another listview item xml class, child items.
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<?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="55dip"
android:orientation="vertical" >
<TextView
android:id="@+id/lblListItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="17dip"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />
</LinearLayout>
ExpendableAdapter.java
we will create a expendableAdapter class and extends BaseExpandableListAdapter adapter
getGroupView() the Method set the required group header.
getChildView() the method set listView item.
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package com.example.androidbeginner;
import java.util.HashMap;
import java.util.List;
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;
public class ExpendableAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
public ExpendableAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
public Object getChild(int groupPosition, int childPosititon) {
// TODO Auto-generated method stub
return _listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return this._listDataHeader.get(groupPosition);
}
public int getGroupCount() {
// TODO Auto-generated method stub
return this._listDataHeader.size();
}
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
MainActivity.java
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package com.example.androidbeginner;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
public class MainActivity extends Activity {
ExpendableAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpendableAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
expListView.setOnGroupClickListener(new OnGroupClickListener() {
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// TODO Auto-generated method stub
return false;
}
});
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
public void onGroupExpand(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
public void onGroupCollapse(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
expListView.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Top Most Used Color Name");
listDataHeader.add("Planet Order List");
listDataHeader.add("Coming Soon..");
// Adding child data
List<String> ColorName = new ArrayList<String>();
ColorName.add("RED");
ColorName.add("BLUE");
ColorName.add("YELLOW");
ColorName.add("GREEN");
ColorName.add("PINK");
ColorName.add("BLACK");
ColorName.add("WHITE");
List<String> nowShowing = new ArrayList<String>();
nowShowing.add(" Sun");
nowShowing.add("Mercury");
nowShowing.add("Earth");
nowShowing.add("Mars");
nowShowing.add("Jupiter");
nowShowing.add(" Saturn");
nowShowing.add("Uranus");
nowShowing.add("Neptune");
List<String> comingSoon = new ArrayList<String>();
comingSoon.add("Aries - Your identity ");
comingSoon.add("Taurus - Your personal resources");
comingSoon.add("Gemini - Your communicative skills ");
comingSoon.add("Cancer - Your family and home");
comingSoon.add("Leo - Your interests and likings ");
comingSoon.add("Virgo - Your day to day works ");
comingSoon.add("Libra - Your partners in life");
comingSoon.add("Scorpio - that which cannot be controlled by you ");
comingSoon.add("Sagittarius - your travels");
comingSoon.add("Capricorn - your career and social status ");
comingSoon.add("Aquarius - Your ideals in life ");
comingSoon.add("Pisces - Your shortcomings ");
listDataChild.put(listDataHeader.get(0), ColorName); // Header, Child data
listDataChild.put(listDataHeader.get(1), nowShowing);
listDataChild.put(listDataHeader.get(2), comingSoon);
}
}
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