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Custom Expandable ListView(Android)

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Here is the example of customize ExpandableListview:
 
 
MainActivity.java
 
importjava.util.ArrayList;
importjava.util.LinkedHashMap;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.ArrayAdapter;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.ExpandableListView;
importandroid.widget.ExpandableListView.OnChildClickListener;
importandroid.widget.ExpandableListView.OnGroupClickListener;
importandroid.widget.Spinner;
importandroid.widget.Toast;
publicclassMainActivity extendsActivity implementsOnClickListener{
privateLinkedHashMap<String, HeaderInfo> myDepartments= newLinkedHashMap<String, HeaderInfo>();
privateArrayList<HeaderInfo> deptList= newArrayList<HeaderInfo>();
privateMyListAdapter listAdapter;
privateExpandableListView myList;
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner spinner = (Spinner) findViewById(R.id.department);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.dept_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
//Just add some data to start with
loadData();
//get reference to the ExpandableListView
myList = (ExpandableListView) findViewById(R.id.myList);
//create the adapter by passing your ArrayList data
listAdapter= newMyListAdapter(MainActivity.this,deptList);
//attach the adapter to the list
myList.setAdapter(listAdapter);
//expand all Groups
expandAll();
//add new item to the List
Button add = (Button) findViewById(R.id.add);
add.setOnClickListener(this);
//listener for child row click
myList.setOnChildClickListener(myListItemClicked);
//listener for group heading click
myList.setOnGroupClickListener(myListGroupClicked);
}
publicvoidonClick(View v) {
switch(v.getId()) {
//add entry to the List
caseR.id.add:
Spinner spinner = (Spinner) findViewById(R.id.department);
String department = spinner.getSelectedItem().toString();
EditText editText = (EditText) findViewById(R.id.product);
String product = editText.getText().toString();
editText.setText("");
//add a new item to the list
intgroupPosition = addProduct(department,product);
//notify the list so that changes can take effect
listAdapter.notifyDataSetChanged();
//collapse all groups
collapseAll();
//expand the group where item was just added
myList.expandGroup(groupPosition);
//set the current group to be selected so that it becomes visible
myList.setSelectedGroup(groupPosition);
break;
// More buttons go here (if any) ...
}
}
//method to expand all groups
privatevoidexpandAll() {
intcount = listAdapter.getGroupCount();
for(inti = 0; i < count; i++){
myList.expandGroup(i);
}
}
//method to collapse all groups
privatevoidcollapseAll() {
intcount = listAdapter.getGroupCount();
for(inti = 0; i < count; i++){
myList.collapseGroup(i);
}
}
//load some initial data into out list
privatevoidloadData(){
addProduct("Apparel","Activewear");
addProduct("Apparel","Jackets");
addProduct("Apparel","Shorts");
addProduct("Beauty","Fragrances");
addProduct("Beauty","Makeup");
}
//our child listener
privateOnChildClickListener myListItemClicked= newOnChildClickListener() {
publicbooleanonChildClick(ExpandableListView parent, View v,
intgroupPosition, intchildPosition, longid) {
//get the group header
HeaderInfo headerInfo = deptList.get(groupPosition);
//get the child info
DetailInfo detailInfo = headerInfo.getProductList().get(childPosition);
//display it or do something with it
Toast.makeText(getBaseContext(),"Clicked on Detail "+ headerInfo.getName()
+ "/"+ detailInfo.getName(), Toast.LENGTH_LONG).show();
returnfalse;
}
};
//our group listener
privateOnGroupClickListener myListGroupClicked= newOnGroupClickListener() {
publicbooleanonGroupClick(ExpandableListView parent, View v,
intgroupPosition, longid) {
//get the group header
HeaderInfo headerInfo = deptList.get(groupPosition);
//display it or do something with it
Toast.makeText(getBaseContext(),"Child on Header "+ headerInfo.getName(),
Toast.LENGTH_LONG).show();
returnfalse;
}
};
//here we maintain our products in various departments
privateintaddProduct(String department, String product){
intgroupPosition = 0;
//check the hash map if the group already exists
HeaderInfo headerInfo = myDepartments.get(department);
//add the group if doesn't exists
if(headerInfo == null){
headerInfo = newHeaderInfo();
headerInfo.setName(department);
myDepartments.put(department, headerInfo);
deptList.add(headerInfo);
}
//get the children for the group
ArrayList<DetailInfo> productList = headerInfo.getProductList();
//size of the children list
intlistSize = productList.size();
//add to the counter
listSize++;
//create a new child and add that to the group
DetailInfo detailInfo = newDetailInfo();
detailInfo.setSequence(String.valueOf(listSize));
detailInfo.setName(product);
productList.add(detailInfo);
headerInfo.setProductList(productList);
//find the group position inside the list
groupPosition = deptList.indexOf(headerInfo);
returngroupPosition;
}
}
MyListAdapter.java
importjava.util.ArrayList;
importandroid.content.Context;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.BaseExpandableListAdapter;
importandroid.widget.TextView;
publicclassMyListAdapter extendsBaseExpandableListAdapter {
privateContext context;
privateArrayList<HeaderInfo> deptList;
publicMyListAdapter(Context context, ArrayList<HeaderInfo> deptList) {
this.context= context;
this.deptList= deptList;
}
@Override
publicObject getChild(intgroupPosition, intchildPosition) {
ArrayList<DetailInfo> productList = deptList.get(groupPosition).getProductList();
returnproductList.get(childPosition);
}
@Override
publiclonggetChildId(intgroupPosition, intchildPosition) {
returnchildPosition;
}
@Override
publicView getChildView(intgroupPosition, intchildPosition, booleanisLastChild,
View view, ViewGroup parent) {
DetailInfo detailInfo = (DetailInfo) getChild(groupPosition, childPosition);
if(view == null) {
LayoutInflater infalInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = infalInflater.inflate(R.layout.child_row,null);
}
TextView sequence = (TextView) view.findViewById(R.id.sequence);
sequence.setText(detailInfo.getSequence().trim() + ") ");
TextView childItem = (TextView) view.findViewById(R.id.childItem);
childItem.setText(detailInfo.getName().trim());
returnview;
}
@Override
publicintgetChildrenCount(intgroupPosition) {
ArrayList<DetailInfo> productList = deptList.get(groupPosition).getProductList();
returnproductList.size();
}
@Override
publicObject getGroup(intgroupPosition) {
returndeptList.get(groupPosition);
}
@Override
publicintgetGroupCount() {
returndeptList.size();
}
@Override
publiclonggetGroupId(intgroupPosition) {
returngroupPosition;
}
@Override
publicView getGroupView(intgroupPosition, booleanisLastChild, View view,
ViewGroup parent) {
HeaderInfo headerInfo = (HeaderInfo) getGroup(groupPosition);
if(view == null) {
LayoutInflater inf = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inf.inflate(R.layout.group_heading,null);
}
TextView heading = (TextView) view.findViewById(R.id.heading);
heading.setText(headerInfo.getName().trim());
returnview;
}
@Override
publicbooleanhasStableIds() {
returntrue;
}
@Override
publicbooleanisChildSelectable(intgroupPosition, intchildPosition) {
returntrue;
}
}
HeaderInfo.java
importjava.util.ArrayList;
publicclassHeaderInfo {
privateString name;
privateArrayList<DetailInfo> productList= newArrayList<DetailInfo>();;
publicString getName() {
returnname;
}
publicvoidsetName(String name) {
this.name= name;
}
publicArrayList<DetailInfo> getProductList() {
returnproductList;
}
publicvoidsetProductList(ArrayList<DetailInfo> productList) {
this.productList= productList;
}
}
DetailInfo.java
publicclassDetailInfo {
privateString sequence= "";
privateString name= "";
publicString getSequence() {
returnsequence;
}
publicvoidsetSequence(String sequence) {
this.sequence= sequence;
}
publicString getName() {
returnname;
}
publicvoidsetName(String name) {
this.name= name;
}
}
activity_main.xml
<?xmlversion="1.0"encoding="UTF-8"?>
<RelativeLayoutxmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"android:layout_height="match_parent"
android:orientation="vertical">
<Spinnerandroid:id="@+id/department"android:layout_width="match_parent"
android:layout_height="wrap_content"android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"android:textStyle="bold"/>
<Buttonandroid:id="@+id/add"android:layout_width="wrap_content"
android:layout_height="wrap_content"android:layout_alignParentRight="true"
android:layout_below="@id/department"android:text="add"/>
<EditTextandroid:id="@+id/product"android:layout_width="fill_parent"
android:layout_height="wrap_content"android:layout_alignBaseline="@id/add"
android:layout_alignParentLeft="true"android:layout_below="@id/department"
android:layout_toLeftOf="@id/add"android:ems="10"android:hint="product_hint"
android:inputType="text"/>
<TextViewandroid:id="@+id/textView1"android:layout_width="match_parent"
android:layout_height="wrap_content"android:layout_alignParentLeft="true"
android:layout_below="@id/product"android:layout_margin="5dp"
android:padding="5dp"
android:text="department_store"android:textAppearance="? android:attr/textAppearanceMedium"
android:textStyle="bold"/>
<ExpandableListViewandroid:id="@+id/myList"
android:layout_width="match_parent"android:layout_height="fill_parent"
android:layout_below="@id/textView1"/>
</RelativeLayout>
child_row.xml
<?xmlversion="1.0"encoding="utf-8"?>
<RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"
android:orientation="vertical"xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="@+id/sequence"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:paddingLeft="35sp"
android:textAppearance="?android:attr/textAppearanceMedium"/>
<TextView
android:id="@+id/childItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@id/sequence"
android:textAppearance="?android:attr/textAppearanceMedium"/>
</RelativeLayout>
group_heading.xml
<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="55dip"
android:orientation="vertical">
<TextView
android:id="@+id/heading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="35sp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold"/>
</LinearLayout>
dimens.xml
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimenname="activity_horizontal_margin">16dp</dimen>
<dimenname="activity_vertical_margin">16dp</dimen>
</resources>
strings.xml
<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<stringname="app_name">ExpandableListView</string>
<stringname="action_settings">Settings</string>
<stringname="hello_world">Hello world!</string>
<stringname="add">Add</string>
<stringname="menu_settings">Settings</string>
<stringname="title_activity_main">MainActivity</string>
<stringname="product_hint">Enter Products for the Store</string>
<stringname="department_store">My Department Store &#8230;</string>
<string-arrayname="dept_array">
<item>Apparel</item>
<item>Beauty</item>
<item>Electronics</item>
<item>Grocery</item>
<item>Home Improvement</item>
<item>Jewelry</item>
<item>Pharmacy</item>
</string-array>
<colorname="snow">#eee9e9</color>
</resources>
AndroidManifest.xml
<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.expandablelistview"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name="com.example.expandablelistview.MainActivity"
android:label="@string/app_name">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>

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