Попробуйте код ниже:
fragment_car_configure.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/configure_car"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="@+id/btConfirmCar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="Confirm Car"/>
<ExpandableListView
android:id="@+id/expandableListView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ExpandableListView>
</LinearLayout>
list_group1.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:padding="8dp"
android:background="@color/colorPrimary"
android:layout_height="wrap_content">
<TextView
android:id="@+id/listTitle"
android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
android:textSize="16dp"
android:textColor="@android:color/white"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/selectedChild"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ff0000"
android:gravity="right"
android:text="Test"/>
</LinearLayout>
list_item1.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="55dip">
<CheckedTextView
android:id="@+id/expandedListItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
android:paddingBottom="5dp"
android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
android:paddingTop="5dp"
android:text="Child"
android:textSize="16dip" />
</LinearLayout>
ConfigureCarFragment.java:
public class ConfigureCarFragment extends Fragment implements View.OnClickListener {
ExpandableListView expandableListView;
ConfigureCarAdapter expandableListAdapter;
List<String> expandableListTitle;
LinkedHashMap<String, List<String>> expandableListDetail;
private int lastExpandedPosition = -1;
private String[] mBrand;
private String[] mTypes;
private String[] mColors;
private Button configure_car;
private Button btConfirmCar;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_car_configure, container, false);
setHasOptionsMenu(true);
mBrand = getResources().getStringArray(R.array.brands);
mTypes = getResources().getStringArray(R.array.types);
mColors = getResources().getStringArray(R.array.colors);
expandableListView = view.findViewById(R.id.expandableListView);
//((MainActivity) getActivity()).setActionBarTitle(getString(R.string.profil));
//expandableListDetail = ConfigureCarData.getData();
expandableListDetail = getData();
expandableListTitle = new ArrayList<>(expandableListDetail.keySet());
expandableListAdapter = new ConfigureCarAdapter( (MainActivity)getContext(), expandableListTitle, expandableListDetail);
expandableListView.setAdapter(expandableListAdapter);
expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
if (lastExpandedPosition != -1 && groupPosition != lastExpandedPosition) {
expandableListView.collapseGroup(lastExpandedPosition);
}
lastExpandedPosition = 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) {
expandableListAdapter.updateWithChildSelected(groupPosition, childPosition);
if(groupPosition < expandableListAdapter.getGroupCount() - 1){
expandableListView.expandGroup(groupPosition + 1);
btConfirmCar.setVisibility(View.GONE);
}else{
expandableListView.collapseGroup(expandableListAdapter.getGroupCount() - 1);
btConfirmCar.setVisibility(View.VISIBLE);
}
return true;
}
});
configure_car = view.findViewById(R.id.configure_car);
configure_car.setOnClickListener(this);
//((MainActivity) getActivity()).setActionBarTitle(getString(R.string.configure_car));
btConfirmCar = view.findViewById(R.id.btConfirmCar);
btConfirmCar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showConfirmedCar("Your confirmed car configuration is:\n");
}
});
expandableListView.expandGroup(0);
return view;
}
private void showConfirmedCar(String header){
String msg = header;
for(int i=0; i<expandableListAdapter.getGroupCount(); i++) {
msg += expandableListAdapter.getGroup(i) + ": " +
expandableListAdapter.getChild(i, expandableListAdapter.checkedChildPosition[i]) + "\n";
}
Toast.makeText(getContext(), msg, Toast.LENGTH_LONG).show();
}
public void onPrepareOptionsMenu(Menu menu) {
menu.clear();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.configure_car:
((MainActivity) getActivity()).getSupportFragmentManager().popBackStack();
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
//getActivity().setTitle(R.string.login);
}
private LinkedHashMap<String, List<String>> getData(){
LinkedHashMap<String, List<String>> listHashMap = new LinkedHashMap<>();
List<String> list;
list = new ArrayList<>();
list.addAll(Arrays.asList(mBrand));
listHashMap.put("Brand", list);
list = new ArrayList<>();
list.addAll(Arrays.asList(mTypes));
listHashMap.put("Type", list);
list = new ArrayList<>();
list.addAll(Arrays.asList(mColors));
listHashMap.put("Color", list);
return listHashMap;
}
}
ConfigureCarAdapter.java:
public class ConfigureCarAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> expandableListTitle;
private HashMap<String, List<String>> expandableListDetail;
public int[] checkedChildPosition; // Save checked child position for each group.
public ConfigureCarAdapter(Context context, List<String> expandableListTitle,
HashMap<String, List<String>> expandableListDetail) {
this.context = context;
this.expandableListTitle = expandableListTitle;
this.expandableListDetail = expandableListDetail;
checkedChildPosition = new int[expandableListTitle.size()];
resetCheckedChildPosition(0);
}
@Override
public String getChild(int listPosition, int expandedListPosition) {
return this.expandableListDetail.get(this.expandableListTitle.get(listPosition)).get(expandedListPosition);
}
@Override
public long getChildId(int listPosition, int expandedListPosition) {
return expandedListPosition;
}
@Override
public View getChildView(int listPosition, int expandedListPosition, boolean isLastChild, View convertView, ViewGroup parent) {
String expandedListText = getChild(listPosition, expandedListPosition);
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.list_item1, null);
}
CheckedTextView expandedListTextView = convertView.findViewById(R.id.expandedListItem);
expandedListTextView.setText(expandedListText);
// Checked the view if this child is checked.
expandedListTextView.setChecked(checkedChildPosition[listPosition] == expandedListPosition);
return convertView;
}
@Override
public int getChildrenCount(int listPosition) {
return this.expandableListDetail.get(this.expandableListTitle.get(listPosition)).size();
}
@Override
public String getGroup(int listPosition) {
return this.expandableListTitle.get(listPosition);
}
@Override
public int getGroupCount() {
return this.expandableListTitle.size();
}
@Override
public long getGroupId(int listPosition) {
return listPosition;
}
@Override
public View getGroupView(int listPosition, boolean isExpanded, View convertView, ViewGroup parent) {
String listTitle = getGroup(listPosition);
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.list_group1, null);
}
TextView listTitleTextView = convertView.findViewById(R.id.listTitle);
listTitleTextView.setTypeface(null, Typeface.BOLD);
listTitleTextView.setText(listTitle);
TextView selectedChild = convertView.findViewById(R.id.selectedChild);
if(checkedChildPosition[listPosition] != -1){
// if group have selected child, get child and display inside header.
selectedChild.setText(getChild(listPosition, checkedChildPosition[listPosition]));
}else{
selectedChild.setText("");
}
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int listPosition, int expandedListPosition) {
return true;
}
// Reset checked childs starts from group "from" to last group.
private void resetCheckedChildPosition(int from) {
if(from < checkedChildPosition.length)
for(int i=from; i<checkedChildPosition.length; i++) checkedChildPosition[i] = -1;
}
// Update adapter when a child is selected.
public void updateWithChildSelected(int group, int child){
resetCheckedChildPosition(group);
checkedChildPosition[group] = child;
notifyDataSetChanged();
}
}
Надеюсь, это поможет!