Develop Reference

android maps displayed multiple markers (LatLng from sqlite)

i use google maps with get (user) device location (GPS Location) in my android app, and insert into database (SQLite) latitude and longitude and adress !
now i want displayed multiple location with LatLng read from database ... no problem in create marker, but in marker info (country, city ...) only show last inserted location for all markers !
this my code :
private void displayMultiplePoint() {
if (LOCATION_TABLE.size() > 0) {
for (int i = 0; LOCATION_TABLE.size() > i; i++) {
int id = LOCATION_TABLE.get(i).getId();
lat = LOCATION_TABLE.get(i).getLatitude();
lng = LOCATION_TABLE.get(i).getLongitude();
place = LOCATION_TABLE.get(i).getPlace();
rate = LOCATION_TABLE.get(i).getRate();
drawMarker(new LatLng(lat, lng), "city", place, rate);
displayToast(id + "" + place);
}
}
}
private void drawMarker(final LatLng point, final String city, final String place, final float rate) {
mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker arg0) {
return null;
}
#Override
public View getInfoContents(Marker arg0) {
View v = null;
try {
v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
map_image.setImageResource(R.drawable.runhd);
TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
city_txt.setText(city);
TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
place_txt.setText(place);
RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
rate_bar.setRating(rate);
} catch (Exception ev) {
System.out.print(ev.getMessage());
}
return v;
}
});
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(point);
mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(point, 6));
}
i show toast form rowId from lcation table in databse, and displaled 3 row id : 1, 2, 3 but in marker info show last id (id no : 3)
this my fragment :
thank's

I have many solution for your case But at first :
Your fall with setInfoWindowAdapter method it's just invoked one time, So after you iterated your database items and passing info through drawMarker it's just shown the last modified (saved) data from the variables, So i suggest to move it in your for loop (I know it's not a perfect solution) :
for (int i = 0; LOCATION_TABLE.size() > i; i++) {
int id = LOCATION_TABLE.get(i).getId();
lat = LOCATION_TABLE.get(i).getLatitude();
lng = LOCATION_TABLE.get(i).getLongitude();
place = LOCATION_TABLE.get(i).getPlace();
rate = LOCATION_TABLE.get(i).getRate();
drawMarker(new LatLng(lat, lng), "city", place, rate);
displayToast(id + "" + place);
..........
#Override
public View getInfoContents(Marker arg0) {
View v = null;
try {
v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
map_image.setImageResource(R.drawable.runhd);
TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
city_txt.setText("city");
TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
place_txt.setText(place);
RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
rate_bar.setRating(rate);
} catch (Exception ev) {
System.out.print(ev.getMessage());
}
return v;
......
}
2nd Solution Using Cursor through your database and use it anywhere (This is will be awesome).
3rd Using Clustering Algorithm in google_maps-utils-example.

The info window is being shown for only last marker because setInfoWindowAdapter() sets info window for the entire map. Inside setInfoWindowAdapter() you need to associate marker argument with corresponding data.
You need to maintain a marker to data map.
Map<Marker, Place> markerToPlaceMap = new HashMap<>();
where, Place is a class to hold city, place, and rating.
class Place {
public String city, place;
public float rating;
}
Note: Please change members to private and implement getters and setters as per your suitability.
Next, Your drawMarker() will change as follows. It needs to add the marker and it's related place to markerToPlace map.
private void drawMarker(final LatLng point, final String city, final String place, final float rate) {
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(point);
Marker marker = mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(point, 6));
markerToPlaceMap.put(marker, new Place(city, place, rating));
}
Finally, you will override GoogleMap.setInfoWindowAdapter() and access Place related to a marker for setting corresponding info contents.
mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker marker) {
return null;
}
#Override
public View getInfoContents(Marker marker) {
View v = null;
try {
v = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
ImageView map_image = (ImageView) v.findViewById(R.id.maps_image);
map_image.setImageResource(R.drawable.runhd);
TextView city_txt = (TextView) v.findViewById(R.id.maps_city);
city_txt.setText(markerToPlace.get(marker).city); // <- Check how corresponding place for a marker is fetched and used
TextView place_txt = (TextView) v.findViewById(R.id.maps_place);
place_txt.setText(markerToPlace.get(marker).place);
RatingBar rate_bar = (RatingBar) v.findViewById(R.id.exercise_display_rate);
rate_bar.setRating(markerToPlace.get(marker).rate);
} catch (Exception ev) {
System.out.print(ev.getMessage());
}
return v;
}
});

i Use Cursor through your database and get data rows (and show in Toast)
but
my code change to this :
private void displayMultiplePoint() {
Cursor cursor = DB_HELPER.LOCATION_MARKERS();
if (cursor.moveToFirst()) {
for (int i = 0; cursor.getCount() > i; i++) {
int id = cursor.getInt(cursor.getColumnIndex("id"));
double lat = cursor.getDouble(cursor.getColumnIndex("latitude"));
double lng = cursor.getDouble(cursor.getColumnIndex("longitude"));
String place = cursor.getString(cursor.getColumnIndex("place"));
float rate = cursor.getFloat(cursor.getColumnIndex("rate"));
displayToast(id + ", " + place + rate);
cursor.moveToNext();
drawMarker(new LatLng(lat, lng));
}
cursor.close();
}
}
i get arg0.getId form : (m0, m1, m2 ...)
public View getInfoContents(Marker arg0)
(is unique for each marker) then select data by id where id = arg0

Android - Cursor onMapReady (Markers)

I'm trying to "inflate" my content from SQLite into Markers but the solution I took of here it's not working, and it's not throwing any information on Log.
I'm a bit new on this Marker stuff and SQLite
My code inside the Fragment:
SQLiteHelper dbHelper = new SQLiteHelper(getActivity());
pds = new ParksDataSource(dbHelper.db);
parks = pds.getAllParks();
List<Marker> markersList = new ArrayList<Marker>();
int i = 0;
Cursor cursor = db.rawQuery("SELECT * FROM " + SQLiteHelper.TABLE_PARKS,
null);
try {
while (cursor.moveToNext()) {
String[] latlong = cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_COORDINATES)).split(",");
double latitude = Double.parseDouble(latlong[0]);
double longitude = Double.parseDouble(latlong[1]);
mark = new LatLng(latitude, longitude);
Marker mPark = mMap.addMarker(new MarkerOptions().position(mark)
.title(cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_TITLE)))
.icon(BitmapDescriptorFactory.fromBitmap(writeTextOnDrawable(R.mipmap.ic_pin, cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_FREE))))));
mPark.setTag(0);
markersList.add(mPark);
Log.d("HierParks", "Pin: " + i + ", " + latitude + "," + longitude + " - Park:" + cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_TITLE)));
i++;
}
} finally {
cursor.close();
}
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (Marker m : markersList) {
builder.include(m.getPosition());
}`
Thank you for your time.

Finally I managed to fix it, hope this help someone.
My ParkDataSource:
public Cursor getAll() {
return db.rawQuery("SELECT * FROM " + SQLiteHelper.TABLE_PARKS,
null);
}
My Fragment:
SQLiteHelper dbHelper = new SQLiteHelper(getActivity());
pds = new ParksDataSource(dbHelper.db);
cursor = pds.getAll();
List<Marker> markersList = new ArrayList<Marker>();
int i = 0;
try {
while (cursor.moveToNext()) {
String[] latlong = cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_COORDINATES)).split(",");
double latitude = Double.parseDouble(latlong[0]);
double longitude = Double.parseDouble(latlong[1]);
mark = new LatLng(latitude, longitude);
if (cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_SLOTS)) == null){
Marker mPark = map.addMarker(new MarkerOptions().position(mark)
.title(cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_TITLE)))
.icon(BitmapDescriptorFactory.fromBitmap(writeTextOnDrawable(R.mipmap.ic_pin, cursor.getString(cursor.getColumnIndex(SQLiteHelper.COL_PARKS_FREE))))));
mPark.setTag(0);
markersList.add(mPark);
}
i++;
}
} finally {
cursor.close();
}
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (Marker m : markersList) {
builder.include(m.getPosition());
}

Calling showInfoWindow() for second time does not update the info window

Here's the thing:
I have a map with markers on it (managed by a ClusterManager) and I am showing an info window each time they are clicked. I am also fetching their address at the time they are clicked, so once I get it, I call showInfoWindow() on the marker again in order to update it. Problem is that the address won't show up in the info window. Here is my InfoWindowAdapter (I have two views according to the type of the marker that is clicked):
class CabinetInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {
public CabinetInfoWindowAdapter () {
}
#Override
public View getInfoWindow(Marker marker) {
// Use the default info window frame
return null;
}
#Override
public View getInfoContents(Marker marker) {
Cabinet cabinet = clickedCabinetMarker.getCabinet();
Log.i("fttxgr", "info contents, cabinet type: " + cabinet.getType().toString());
switch (cabinet.getType()) {
case ADSL:
case VDSL:
return getCabinetView(cabinet, marker);
case DSLAM:
return getDslamView(cabinet, marker);
default: return null;
}
}
private final View getCabinetView (final Cabinet cabinet, final Marker marker) {
View view = getLayoutInflater().inflate(R.layout.cabinet_info_window, null);
TextView cabinetId = (TextView) view.findViewById(R.id.cabinet_id);
TextView cabinetType = (TextView) view.findViewById(R.id.cabinet_type);
TextView cabinetAddress = (TextView) view.findViewById(R.id.cabinet_address);
TextView cabinetCoordinates = (TextView) view.findViewById(R.id.cabinet_coordinates);
TextView cabinetUserNick = (TextView) view.findViewById(R.id.cabinet_user_nick);
ImageView cabinetImage = (ImageView) view.findViewById(R.id.cabinet_image);
View header = view.findViewById(R.id.header);
cabinetId.setText (cabinet.getId() + " - " + cabinet.getCabinetNumber());
cabinetType.setText (cabinet.getType().toString());
switch (cabinet.getType()) {
case ADSL:
header.setBackgroundColor(getResources().getColor(R.color.adsl_red));
break;
case VDSL:
header.setBackgroundColor(getResources().getColor(R.color.vdsl_green));
break;
}
cabinetCoordinates.setText(cabinet.getCoordinates().toString());
if (cabinet.getImage() == null) {
loadCabinetImage(marker);
} else {
cabinetImage.setImageBitmap(cabinet.getImage());
}
if (cabinet.getUserNick() == null) {
loadCabinetUserNick(cabinet, cabinet.getUserId(), cabinet.getmUserSite(), marker);
} else {
cabinetUserNick.setText("Added by user: " + cabinet.getUserNick());
}
if (cabinet.getAddress() == null) {
loadCabinetAddress(cabinet.getCoordinates().latitude,
cabinet.getCoordinates().longitude, marker);
} else {
cabinetAddress.setText("Address: " + cabinet.getAddress());
}
return view;
}
private final View getDslamView (final Cabinet cabinet, final Marker marker) {
View view = getLayoutInflater().inflate(R.layout.dslam_info_window, null);
TextView dslamId = (TextView) view.findViewById(R.id.dslam_id);
TextView dslamAddress = (TextView) view.findViewById (R.id.dslam_address);
TextView dslamCoordinates = (TextView) view.findViewById (R.id.dslam_coordinates);
dslamId.setText(cabinet.getId() + " - " + cabinet.getCabinetNumber());
dslamCoordinates.setText(cabinet.getCoordinates().toString());
if (cabinet.getAddress() == null) {
Log.i("fttxgr", "address is null");
loadCabinetAddress(cabinet.getCoordinates().latitude,
cabinet.getCoordinates().longitude, marker);
} else {
Log.i("fttxgr", "address is there: " + cabinet.getAddress());
dslamAddress.setText("Address: " + cabinet.getAddress());
}
return view;
}
}
And the loadCabinetAddress() function:
private void loadCabinetAddress (final double lat, final double lng, final Marker marker) {
Geocoder geocoder;
List<Address> addresses;
geocoder = new Geocoder(this, Locale.getDefault());
try {
addresses = geocoder.getFromLocation(lat, lng, 1);
String address = addresses.get(0).getAddressLine(0);
String city = addresses.get(0).getLocality();
String country = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String concat = "" +
((address != null) ? address : "") + " - " +
((city != null) ? city : "") + " - " +
((country != null) ? country : "") + " - " +
((postalCode != null) ? postalCode : "");
clickedCabinetMarker.getCabinet().setAddress(concat);
Log.i("fttxgr", "address loaded, showing info window again");
marker.showInfoWindow();
} catch (IOException e) {
e.printStackTrace();
}
}
All the logs indicate that everything goes as expected. So why isn't the info window being updating properly?
P.S. The funny thing is that for the first view (the one returned by getCabinetView()), the update is working! But I also load an image and a user nickname asynchronously, and I call showInfoWindow() three times to update them all.

You can directly use the setOnClusterItemClickListener method if you want to put the infowindow for each item in the cluster of if you want to put a single inforwindow for the whole cluster you can create it using the setOnClusterClickListener method instead of doing all this heavy lifting.
Create a ClusterManager and set the info window using the adapter:
ClusterManager<MarkerItem> clusterMgr = new ClusterManager<MarkerItem>(context, map);
map.setInfoWindowAdapter(clusterMgr.getMarkerManager());
Create infowindowadapter for one of them:
clusterMgr.getMarkerCollection().setOnInfoWindowAdapter(new MyCustomAdapterForItems());
Final piece is mapping the raw Marker object that you'll receive in your custom InfoWindowAdapter's callback to the ClusterItem object(s) that you added to the map in the first place. This can be achieved using the onClusterClick and onClusterItemClick listeners, as follows:
map.setOnMarkerClickListener(clusterMgr);
clusterMgr.setOnClusterItemClickListener(new OnClusterItemClickListener<MarkerItem>() {
#Override
public boolean onClusterItemClick(MarkerItem item) {
clickedClusterItem = item;
return false;
}
});

getLastKnownLocation can't get new data by location.setLatitude/setLongitude?

My full code
https://gist.github.com/anonymous/6dd0f33270cc4f46149e
In line 110~131 I want to change the location, it does work, the mapview will change
private class MapClickedListener implements OnClickListener {
#Override
public void onClick (View v) {
String lng = "121.558561";
lng = edt_lng.getText().toString().trim();
String lat = "25.031005";
lat = edt_lat.getText().toString().trim();
if(lng.equals("")||lat.equals("")){
Toast.makeText(getApplicationContext(), "input again！", Toast.LENGTH_LONG).show();
location = locManager.getLastKnownLocation(bestProvider);
updateToNewLocation(location);
}else{
Location location = new Location(LocationManager.NETWORK_PROVIDER);
location.setLongitude(Double.parseDouble(lng));
location.setLatitude(Double.parseDouble(lat));
updateToNewLocation(location);
}
}
}
On line 133~148, I want to know distance between location and a point I set
private Button.OnClickListener EQ = new Button.OnClickListener(){
#Override
public void onClick (View v) {
eqlocation.setLongitude(120.82);
eqlocation.setLatitude(23.85);
location = locManager.getLastKnownLocation(bestProvider);
float[] result = new float[5];
Location.distanceBetween(location.getLatitude(), location.getLongitude(), eqlocation.getLatitude(), eqlocation.getLongitude(), result);
BigDecimal bd = new BigDecimal(result[0]);
BigDecimal rounded = bd.setScale(2, RoundingMode.HALF_UP);
double dis = rounded.doubleValue();
String dist = String.valueOf(dis/1000);
Toast.makeText(getApplicationContext(), "distance： " + dist + "km", Toast.LENGTH_LONG).show();
}
};
But the result is wrong when I change the location by line 110~131's code.
What should I do to get the right result?

have you tried distanceTo() and checked if you get any better results?, I ususally use distanceTo() with good results.

Android, How to remove all markers from Google Map V2?

I have map view in my fragment. I need to refresh map and add different markers based on condition. So, I should remove last markers from map before add new markers.
Actually, some weeks ago app was working fine and suddenly it happened. My code is like this:
private void displayData(final List<Venue> venueList) {
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
.
.
.
}
Last time it was working fine (before new Google Map API announce by Android team in I/O 2013). However, after that I adapted my code to use this new API. Now, I don't know why this method googleMap.clear(); doesn't work!
Any suggestion would be appreciated. Thanks
=======
Update
=======
Complete code:
private void displayData(final List<Venue> venueList) {
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(ZOOM_LEVEL), 2000, null);
// Add marker of user's position
MarkerOptions userIndicator = new MarkerOptions()
.position(new LatLng(lat, lng))
.title("You are here")
.snippet("lat:" + lat + ", lng:" + lng);
googleMap.addMarker(userIndicator);
// Add marker of venue if there is any
if(venueList != null) {
for(int i=0; i < venueList.size(); i++) {
Venue venue = venueList.get(i);
String guys = venue.getMaleCount();
String girls= venue.getFemaleCount();
String checkinStatus = venue.getCan_checkin();
if(checkinStatus.equalsIgnoreCase("true"))
checkinStatus = "Checked In - ";
else
checkinStatus = "";
MarkerOptions markerOptions = new MarkerOptions()
.position(new LatLng(Double.parseDouble(venue.getLatitude()), Double.parseDouble(venue.getLongitude())))
.title(venue.getName())
.snippet(checkinStatus + "Guys:" + guys + " and Girls:" + girls)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_orange_pin));
googleMap.addMarker(markerOptions);
}
}
// Move the camera instantly to where lat and lng shows.
if(lat != 0 && lng != 0)
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), ZOOM_LEVEL));
googleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker marker) {
return null;
}
#Override
public View getInfoContents(Marker marker) {
return null;
}
});
googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
#Override
public void onInfoWindowClick(Marker marker) {
String str = marker.getId();
Log.i(TAG, "Marker id: " + str);
str = str.substring(1);
int markerId = Integer.parseInt(str);
markerId -= 1; // Because first item id of marker is 1 while list starts at 0
Log.i(TAG, "Marker id " + markerId + " clicked.");
// Ignore if User's marker clicked
if(markerId < 0)
return;
try {
Venue venue = venueList.get(markerId);
if(venue.getCan_checkin().equalsIgnoreCase("true")) {
Fragment fragment = VenueFragment.newInstance(venue);
if(fragment != null)
changeFragmentLister.OnReplaceFragment(fragment);
else
Log.e(TAG, "Error! venue shouldn't be null");
}
} catch(NumberFormatException e) {
e.printStackTrace();
} catch(IndexOutOfBoundsException e) {
e.printStackTrace();
}
}
});

Okay finally I found a replacement way to solve my problem. The interesting problem is when you assign a marker to map, it's id is 'm0'. When you remove it from map and assign new marker you expect the id should be 'm0' but it's 'm1'. Therefore, it showed me the id is not trustable. So I defined List<Marker> markerList = new ArrayList<Marker>(); somewhere in onActivityCreated() of my fragment.
Then changed above code with following one. hope it helps others if they have similar issue with markers.
private void displayData(final List<Venue> venueList) {
Marker marker;
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
markerList.clear();
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(ZOOM_LEVEL), 2000, null);
// Add marker of user's position
MarkerOptions userIndicator = new MarkerOptions()
.position(new LatLng(lat, lng))
.title("You are here")
.snippet("lat:" + lat + ", lng:" + lng);
marker = googleMap.addMarker(userIndicator);
// Log.e(TAG, "Marker id '" + marker.getId() + "' added to list.");
markerList.add(marker);
// Add marker of venue if there is any
if(venueList != null) {
for (Venue venue : venueList) {
String guys = venue.getMaleCount();
String girls = venue.getFemaleCount();
String checkinStatus = venue.getCan_checkin();
if (checkinStatus.equalsIgnoreCase("true"))
checkinStatus = "Checked In - ";
else
checkinStatus = "";
MarkerOptions markerOptions = new MarkerOptions()
.position(new LatLng(Double.parseDouble(venue.getLatitude()), Double.parseDouble(venue.getLongitude())))
.title(venue.getName())
.snippet(checkinStatus + "Guys:" + guys + " and Girls:" + girls)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_orange_pin));
marker = googleMap.addMarker(markerOptions);
// Log.e(TAG, "Marker id '" + marker.getId() + "' added to list.");
markerList.add(marker);
}
}
// Move the camera instantly to where lat and lng shows.
if(lat != 0 && lng != 0)
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), ZOOM_LEVEL));
googleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker marker) {
return null;
}
#Override
public View getInfoContents(Marker marker) {
return null;
}
});
googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
#Override
public void onInfoWindowClick(Marker marker) {
int markerId = -1;
String str = marker.getId();
Log.i(TAG, "Marker id: " + str);
for(int i=0; i<markerList.size(); i++) {
markerId = i;
Marker m = markerList.get(i);
if(m.getId().equals(marker.getId()))
break;
}
markerId -= 1; // Because first item of markerList is user's marker
Log.i(TAG, "Marker id " + markerId + " clicked.");
// Ignore if User's marker clicked
if(markerId < 0)
return;
try {
Venue venue = venueList.get(markerId);
if(venue.getCan_checkin().equalsIgnoreCase("true")) {
Fragment fragment = VenueFragment.newInstance(venue);
if(fragment != null)
changeFragmentLister.OnReplaceFragment(fragment);
else
Log.e(TAG, "Error! venue shouldn't be null");
}
} catch(NumberFormatException e) {
e.printStackTrace();
} catch(IndexOutOfBoundsException e) {
e.printStackTrace();
} catch (NullPointerException e) {
e.printStackTrace();
}
}
});
}

If you want to clear "all markers, overlays, and polylines from the map", use clear() on your GoogleMap.

Use map.clear() to remove all markers from Google map

Suppose there is an ArrayList of 2 locations. Now, you display markers on the map based on that array. There will be two markers. When you click on the first marker it gives you a marker index m0 and the second is m1.
Say that you refresh location array and now you got an array with 3 locations. You got 3 markers. But when you click on the first one, it gives you marker index m2 (as if it continues counting from the first location arraw) the second is m3 and the third is m4. What you actually want is to make it as m0, m1, m2.
Now, when you build you location array you probably call location.add("you location")... and when you rebuild it (refresh it) you call location.clear() first and then build it again.
SOLUTION:
First, make another dummy array similar to location array and build it in for loop together with a real location array: locaionDummy.add(i) but don't you EVER refresh it - that way it keeps building and you will know how many locations you've ever had from the very beginning.
Second, do something like this (example of setting image) with mIndex as int variable:
void locatePins() {
mIndex = locationDummy.size()-location.size();
for (int i = 0; i < userID.size(); i++) {
LatLng pgLocation = new LatLng(Double.parseDouble(latArr.get(i)), Double.parseDouble(lngArr.get(i)));
myMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
#Override
public View getInfoWindow(Marker marker) {
View view = getLayoutInflater().inflate(R.layout.map_marker_info, null);
RelativeLayout markerInfo= view.findViewById(R.id.markerInfo);
TextView name = view.findViewById(R.id.userName);
TextView details = view.findViewById(R.id.userInfo);
ImageView img = view.findViewById(R.id.userImg);
name.setText(marker.getTitle());
details.setText(marker.getSnippet());
img.setImageBitmap (bmImg.get(Integer.parseInt(marker.getId().replaceAll("[^\\d.]", ""))-mIndex));
return view;
}
#Override
public View getInfoContents(Marker marker) {
return null;
}
// ... the rest of the code
}
}
The key is to subtract the real location.size() from a locationDummy.size() to get a number int mIndex that you will subtract later on from marker.getId()

If you need to remove only the markers, and leave other things such as ground overlay,etc there, use:
marker.remove();
or if you have many:
if(markers!=null&&mMap!=null){
for(int i=0;i<markers.size();i++){
markers.get(i).remove();
}
}
where
List<Marker> markers = new ArrayList<>();