This is my EXPlistview :
public class ExpandableList extends MainActivity {
private LinkedHashMap<String, GroupInfo> subjects = new LinkedHashMap<String, GroupInfo>();
private ArrayList<GroupInfo> deptList = new ArrayList<GroupInfo>();
private CustomAdapter listAdapter;
private ExpandableListView simpleExpandableListView;
// private Button ShoppingCart;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shopping_list);
// add data for displaying in expandable list view
loadData();
//get reference of the ExpandableListView
simpleExpandableListView = (ExpandableListView) findViewById(R.id.simpleExpandableListView);
// create the adapter by passing your ArrayList data
listAdapter = new CustomAdapter(ExpandableList.this, deptList);
// attach the adapter to the expandable list view
simpleExpandableListView.setAdapter(listAdapter);
//expand all the Groups
expandAll();
// setOnChildClickListener listener for child row click
simpleExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
//get the group header
GroupInfo headerInfo = deptList.get(groupPosition);
//get the child info
ChildInfo detailInfo = headerInfo.getProductList().get(childPosition);
return false;
}
});
// setOnGroupClickListener listener for group heading click
simpleExpandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
//get the group header
GroupInfo headerInfo = deptList.get(groupPosition);
return false;
}
});
}
//method to expand all groups
private void expandAll() {
int count = listAdapter.getGroupCount();
for (int i = 0; i < count; i++) {
simpleExpandableListView.expandGroup(i);
}
}
//method to collapse all groups
private void collapseAll() {
int count = listAdapter.getGroupCount();
for (int i = 0; i < count; i++) {
simpleExpandableListView.collapseGroup(i);
}
}
//load some initial data into out list
private void loadData() {
addProduct("Dairy", "Cheese");
addProduct("Dairy", "Milk");
addProduct("Meat", "Chicken");
addProduct("Meat", "Fish");
addProduct("Electronics", "Camera");
addProduct("Electronics", "Refrigerator");
addProduct("Fruits", "Oranges");
addProduct("Fruits", "Apples");
addProduct("Vegetables", "Broccoli");
addProduct("Vegetables", "Carrot");
}
//here we maintain our products in various departments
private int addProduct(String department, String product) {
int groupPosition = 0;
//check the hash map if the group already exists
GroupInfo headerInfo = subjects.get(department);
//add the group if doesn't exists
if (headerInfo == null) {
headerInfo = new GroupInfo();
headerInfo.setName(department);
subjects.put(department, headerInfo);
deptList.add(headerInfo);
}
//get the children for the group
ArrayList<ChildInfo> productList = headerInfo.getProductList();
//size of the children list
int listSize = productList.size();
//add to the counter
listSize++;
//create a new child and add that to the group
ChildInfo detailInfo = new ChildInfo();
detailInfo.setName(product);
productList.add(detailInfo);
headerInfo.setProductList(productList);
//find the group position inside the list
groupPosition = deptList.indexOf(headerInfo);
return groupPosition;
}
}
Here's my Custom Adapter:
public class CustomAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<GroupInfo> deptList;
public CustomAdapter(Context context, ArrayList<GroupInfo> deptList) {
this.context = context;
this.deptList = deptList;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
ArrayList<ChildInfo> productList = deptList.get(groupPosition).getProductList();
return productList.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View view, ViewGroup parent) {
ChildInfo detailInfo = (ChildInfo) getChild(groupPosition, childPosition);
if (view == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = infalInflater.inflate(R.layout.child_items, null);
}
TextView childItem = (TextView) view.findViewById(R.id.childItem);
childItem.setText(detailInfo.getName().trim());
return view;
}
@Override
public int getChildrenCount(int groupPosition) {
ArrayList<ChildInfo> productList = deptList.get(groupPosition).getProductList();
return productList.size();
}
@Override
public Object getGroup(int groupPosition) {
return deptList.get(groupPosition);
}
@Override
public int getGroupCount() {
return deptList.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isLastChild, View view,
ViewGroup parent) {
GroupInfo headerInfo = (GroupInfo) getGroup(groupPosition);
if (view == null) {
LayoutInflater inf = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inf.inflate(R.layout.group_items, null);
}
TextView heading = (TextView) view.findViewById(R.id.textgroup);
heading.setText(headerInfo.getName().trim());
return view;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
And here is my main activity :
public class MainActivity extends AppCompatActivity {
ImageButton StoreLayout, navigation, promotion, products, shoppinglist;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Shoppinglist= (ImageButton) findViewById(R.id.shoppinglist);
Shoppinglist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, Expandablelistview.class);
startActivity(intent);
}
});
