Add Cluster Items onClick over Expandable List View - android-activity

Question

First of all I'm sorry for my bad English :X
Iam quite a newbie in Android App development and Iam about to develope an app which gives the user informations like free park-places in town.
The app is based on Google Maps.
My Problem:
My app starts and shows a Google Maps Layout. Over an ExpandableListView the User can open a overview about the Parking-Locations.
If the user click on a Child Item in the ExpListView a new Cluster item should be generated at the MapsLayout.
How can I give the OnClick data to the MainActivity? I want that the MainActivity 'knew' which Item is clicked by the User!
Im glad about every answer :)
public class MyExpandableAdapter extends BaseExpandableListAdapter{
private Activity activity;
private ArrayList<Object> childtems;
private LayoutInflater inflater;
private ArrayList<String> parentItems, child;
// constructor
public MyExpandableAdapter(ArrayList<String> parents, ArrayList<Object> childern)
{
this.parentItems = parents;
this.childtems = childern;
}
public void setInflater(LayoutInflater inflater, Activity activity)
{
this.inflater = inflater;
this.activity = activity;
}
// method getChildView is called automatically for each child view.
// Implement this method as per your requirement
#Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
{
child = (ArrayList<String>) childtems.get(groupPosition);
TextView textView = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.child_view, null);
}
// get the textView reference and set the value
textView = (TextView) convertView.findViewById(R.id.textViewChild);
textView.setText(child.get(childPosition));
// set the ClickListener to handle the click event on child item
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(activity, child.get(childPosition),
Toast.LENGTH_SHORT).show();
//Tried to insert connection to MapsActivity but doesnt work!
}
});
return convertView;
}
// method getGroupView is called automatically for each parent item
// Implement this method as per your requirement
#Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
if (convertView == null) {
convertView = inflater.inflate(R.layout.parent_view, null);
}
((CheckedTextView) convertView).setText(parentItems.get(groupPosition));
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
#Override
public Object getChild(int groupPosition, int childPosition)
{
return null;
}
#Override
public long getChildId(int groupPosition, int childPosition)
{
return 0;
}
#Override
public int getChildrenCount(int groupPosition)
{
return ((ArrayList<String>) childtems.get(groupPosition)).size();
}
#Override
public Object getGroup(int groupPosition)
{
return null;
}
#Override
public int getGroupCount()
{
return parentItems.size();
}
#Override
public void onGroupCollapsed(int groupPosition)
{
super.onGroupCollapsed(groupPosition);
}
#Override
public void onGroupExpanded(int groupPosition)
{
super.onGroupExpanded(groupPosition);
}
#Override
public long getGroupId(int groupPosition)
{
return 0;
}
#Override
public boolean hasStableIds()
{
return false;
}
#Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
return false;
}
}
MapsActivity (Main)
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private ClusterManager<MyItem> mClustermanager ;
private ArrayList<String> parentItems = new ArrayList<String>();
private ArrayList<Object> childItems = new ArrayList<Object>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpClusterer();
// Create Expandable List and set it's properties
ExpandableListView expandableList = (ExpandableListView) findViewById(R.id.expandableListView);
expandableList.setDividerHeight(2);
expandableList.setGroupIndicator(null);
expandableList.setClickable(true);
// Set the Items of Parent
setGroupParents();
// Set The Child Data
setChildData();
// Create the Adapter
MyExpandableAdapter adapter = new MyExpandableAdapter(parentItems, childItems);
adapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
// Set the Adapter to expandableList
expandableList.setAdapter(adapter);
// expandableList.setOnChildClickListener();
}
// method to add parent Items
public void setGroupParents()
{
parentItems.add("Parkhäuser");
}
public void setChildData()
{
ArrayList<String> child = new ArrayList<String>();
child = new ArrayList<String>();
child.add("Park1");
child.add("Park2");
child.add("Park3");
child.add("Park4");
childItems.add(child);
}
private void setUpClusterer()
{
((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(47.99481, 7.84856), 10 )) ;
//Initialisierung des Managers mit dem Context (this) und der Map
//Activity erbt von Context deswegen können wir dem Konstruktor 'this' mitgeben
mClustermanager = new ClusterManager<MyItem>(this, ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap() );
//Zeigt der Map die Listener des ClusterManagers
((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap().setOnCameraChangeListener((mClustermanager));
((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap().setOnMarkerClickListener(mClustermanager);
//Hinzufügen der Markierungen zum Cluster Manager
addItems() ;
}
private void addItems(){
//Startkoordinaten des ersten Markers --> Bahnhofsgarage
double lat = 47.99673 ;
double lng = 7.84152 ;
//Hinzufügen von 10 weiteren Punkten
for(int i = 1; i <14; i++){
if(i==1)
{ //Konzerthaus
lat = 47.99602 ;
lng = 7.84220;
}
if(i==2){
//Volksbank
lat = 47.99783 ;
lng = 7.84322;
}
if(i==3){
//am Bahnhof
lat = 47.99892 ;
lng = 7.84310;
}
if(i==4){
//Uni-FMF/Vf
lat = 48.00135 ;
lng = 7.84481;
}
if(i==5){
//unterlinden
lat = 47.99811 ;
lng = 7.84876;
}
if(i==6){
//schwarzwaldcity
lat = 47.99760 ;
lng = 7.85090;
}
if(i==7){
//Rotteckring
lat = 47.99618 ;
lng = 7.84732;
}
if(i==8){
//Am Zähringer Tor
lat = 47.99921 ;
lng = 7.85350;
}if(i==9){
//Karlsbau
lat = 47.99757 ;
lng = 7.85366;
}if(i==10){
//Landratsamt
lat = 47.99969 ;
lng = 7.85758;
}if(i==11){
//Schlossberg
lat = 47.99654 ;
lng = 7.85758;
}if(i==12){
//Schwabentor
lat = 47.99054 ;
lng = 7.85833;
}if(i==13){
//Am Martinstor
lat = 47.99281 ;
lng = 7.84715;
}if(i==14){
//Uni Kolleg Gebäude
lat = 47.98797 ;
lng = 7.87129;
}
MyItem offsetItem = new MyItem(lat,lng) ;
mClustermanager.addItem(offsetItem);
}
}
}

Answer 1

Solved! After research I make ExpandableAdpater an inner class of MapsActivity! Now i can put data between both classes and use Methods also!