Develop Reference

Android Google maps-v2 previous polyline not removing

After trying all the previous answers on StackOverflow I am posting this answer.
I am showing live location of a driver and a path from that location to a specific destination. What i want is to remove the old polyline soon the live location of driver changes but it's not hapening and it's increasing number of polylines.
Here is the code where i am removing the polyline but it's not working.
private void drawRouteOnMap(GoogleMap map, List<LatLng> positions) {
PolylineOptions options = new PolylineOptions().width(12).color(Color.GREEN).geodesic(true);
options.addAll(positions);
if (polyline != null) {
polyline.remove();
Log.e("Old Poly", "Removed");
}
Log.e("Poly", "Added");
polyline = mMap.addPolyline(options);
}

Try like this.
// decleare it globally
List<Polyline> polylines = new ArrayList<Polyline>();
private void drawRouteOnMap(GoogleMap map, List<LatLng> positions) {
PolylineOptions options = new PolylineOptions().width(12).color(Color.GREEN).geodesic(true);
for(Polyline polyline: polylines){
polyline.remove();
}
polylines.clear();
for(LatLng latlng: positions){
options.add(latlng);
polylines.add(mMap.addPolyline(options);
}
}

I have solved it myself. It is because that function was being called from another call due to which polyline instance was null. Solved it by saving polyline in SharedPrefrence and retrieving that value again on next call.

android Polyline going to lag the map after while

i am creating a user tracker project , and what i want to do is to draw the user path on the map , the method that i used it's Polyline and this is the code
public void drawOnMap(ArrayList<LatLng> directionPoints) {
PolylineOptions rectLine = new PolylineOptions().width(5).color(Color.GREEN).geodesic(false);
rectLine.addAll(directionPoints);
mMap.addPolyline(rectLine);
}
but after about 500 polyline the map going to laggy and after 1900 the app crash
so is there is better solution

i found a solution and this is the right code
private Polyline polyline;
public void drawOnMap(ArrayList<LatLng> directionPoints) {
if(polyline == null)
{
PolylineOptions rectLine = new PolylineOptions().width(5).color(Color.GREEN).geodesic(false);
rectLine.addAll(directionPoints);
polyline = mMap.addPolyline(rectLine);
}else{
polyline.setPoints(directionPoints);
}
}

How to draw polylines from Google Directions Api

I'm trying to draw a polyline from what the Google Directions Api returns, the api has this field, overview_polyline, I'm assuming that this field contains the entire polyline so I was thinking why not draw the polyline from there, this is what I have in my JSON, from Google:
{
geocoded_waypoints: [
{},
{}
],
routes: [
{
bounds: {},
copyrights: "Dados do mapa ©2017 Google, Inst. Geogr. Nacional",
legs: [],
overview_polyline: {
points: "cxwnFtdct#dAQlAf#fAf#|Aq#l#]pCcFhCjA|LfJlAT~#IpDi#jAb#f#HXi#t#kBhBeBx#Qz#z#dClHzFpW`H|RvTpj#`AxAdBdAnAXhB?fBk#rAcAnG_HhCgAjAKrATbA`Al#lBHnAc#rFgBhIkCxMBfIlBvHnBtCnB|AnEdCrJxFj#fB#h#OhAgCtHGfCl#jAlA\jE]tDBzBb#tLxFtK~E`d#hShIzEtDhDxDrEfDpFlFjNvDtRdDjThF`TzH`QhEhG|EvFhL`JpJtE|LpEdOpFjOzGlPfJlHzE~NjLfQvPfP|RtHrKxDjGfI|NdHbOvGjPfCbHpCtIvJh_#vG|[|CtNvFvSvE~MfI|QzLbTfNxQbKlKrRzP|NnNvNlQjIzMnLfV`T|h#nDbHhIdMxFjH~JrMnEfHzIrQfHvOtEjI|MnQfNzP`FzI~EnLrKp[nDlHvErHzL~MbRbM`EjCjFxEtRnX|D~EjIhI~WrRxGlGdFnG`JjNxHzKfTxVfKfRfMbRlErHtBlFxIjYvHnPpBtFxF~WpCjHjGhJfDzClF~CnDlArDl#pC\vHXvX[lOaB|GcBdFqBxQwJbDmAxE_ApJ_#jEXtItBrQ~EbQbDlUfBpMfA|IxCbF`DhGlGnJjKtJrF`SpFbRnDdUxAbGrAlEjBnFpDtNnMfGlE~[lTbRdQjTpUxH`GjHfEnGlC`O|DrUxEnEzAfFrBnSpIjPnDxSlAf\lAl~#hDzRrAjOpBvKrBrQtEv^pM``#rPrR|JxSdMlGnGfGtH~HxFdFlBtGfApGp#bG|AnHxD|FzFrH`L~FvH|HrFrFtBtFjA~Mt#pHR|FhA`IfDpEbDzFxGrHrKhEtErF`EnS`MzMvItSdUfF~DtE~B|SrInEnBzDtCxN`QpQfVtQ~Yjn#~fAnK`RvLlRzEjF|GlFrc#vUfRjKfIvGxDhEjIxKdN~T`L~MrFvE~LhIlp#fb#xCtBzFtFbEzFbDrGhH`TfF|JnGfHzEdD|UdIpTdHtKtFj]nUrEzC~[pTfLfG|EbB~KfCnTvDpmAxSzs#~LhOfDzOdFfOxGdY`O`k#zYnVzMlK|HrFjFbXj[rCbCvDfB|FfBbD^xRBlb#nBrIdArJvDfD|B|FzFvFzHnCbIDrCk#dA_A_#q#mHz#sAvAJ^f#r#n#x#UR_#fBGjET`S~#ro#pCpXpAfFp#dEhCnGtE#HXl#n#H^W|ASpShAbZxAtPp#~SjAzGZKdDStBd#x#dC#nEVz#HtAp#b#\OZ|AbBxDnFJf#"
},
summary: "A1",
warnings: [ ],
waypoint_order: [ ]
}
],
status: "OK"
}
How do I draw with that value?

This help me,you can use it..
Firstly create a google server key from google developer account
GoogleDirection.withServerKey(getResources().getString(R.string.SERVER_KEY))
.from(SourceLatlng)
.to(DestinationLatlng)
.execute(new DirectionCallback() {
#Override
public void onDirectionSuccess(Direction direction, String message) {
if (direction.isOK()) {
routeSucess2(direction, message,SourceLatlng,DestinationLatlng);
} else {
//selectedRawLine = ERROR;
}
}
#Override
public void onDirectionFailure(Throwable t) {
t.printStackTrace();
}
});
then draw a route using google direction
private void routeSucess2(Direction direction, String message,LatLng sourceLatlng,LatLng DestinationLng) {
for (Route route : direction.getRouteList()) {
PolylineOptions polyoptions = new PolylineOptions();
polyoptions.color(getResources().getColor(R.color.primary__dark));
polyoptions.width(5);
polyoptions.addAll(route.getOverviewPolyline().getPointList());
poly = googleMap.addPolyline(polyoptions);
poly.setClickable(true);
}
LatLngBounds.Builder latLngBuilder = new LatLngBounds.Builder();
if(sourceLatlng!=null)
latLngBuilder.include(sourceLatlng);
if(DestinationLng!=null)
latLngBuilder.include(DestinationLng);
try {
LatLngBounds bounds = latLngBuilder.build();
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds,
UiHelper.dpToPixel(getActivity(), 135));
googleMap.animateCamera(cu);
} catch (Exception e) {
e.printStackTrace();
}
}
This would help you.

#alb First you should parse lat,long from JSON. You can see this link:
https://developers.google.com/maps/documentation/directions/
Then you have to get lat, long values & put them in List<>.
After that you can use below code for draw polyline on map:
PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
for (int z = 0; z < list.size(); z++) {
LatLng point = list.get(z);
options.add(point);
}
line = myMap.addPolyline(options);

I already have replied on similar question on below link
How to buffer a polyline in Android or draw a polygon around a polyline?
It will resolve your Issue probably

receiving ambiguous sky screen while loading google map

while loading google map on device i am receiving below screen sometimes.it comes on second load as shown below. otherwise it comes perfectly as normal google map with route I am using SupportmapFragment and get googleMap object as.
supportMapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map_view_fragment);
below is code for displaying map in activity/fragment
public static void drawRouteIntoMap(final List<? extends MapHelper> position, final GoogleMap googleMap) {
/*List<MapHelper> position = new ArrayList<MapHelper>();
for (int i = lastPosition; i < maps.size(); i++) {
position.add(maps.get(i));
}*/
final LatLngBounds.Builder mapBounds = new LatLngBounds.Builder();
if (position.size() > 0 && Validator.isNotNull(googleMap)) {
googleMap.clear();
List<PolylineOptions> polylineOptionses = new ArrayList<PolylineOptions>();
PolylineOptions option = null;
Boolean lastPause = null;
for (MapHelper map : position) {
if (map.isPause()) {
if (Validator.isNull(lastPause) || !lastPause) {
option = new PolylineOptions().width(5).color(Color.rgb(255, 0, 155)).geodesic(true);
polylineOptionses.add(option);
}
mapBounds.include(new LatLng(map.getLatitude(),map.getLongitude()));
option.add(new LatLng(map.getLatitude(), map.getLongitude()));
} else {
if (Validator.isNull(lastPause) || lastPause) {
option = new PolylineOptions().width(5).color(Color.rgb(0, 179, 253)).geodesic(true);
polylineOptionses.add(option);
}
mapBounds.include(new LatLng(map.getLatitude(),map.getLongitude()));
option.add(new LatLng(map.getLatitude(), map.getLongitude()));
}
lastPause = map.isPause();
}
for (PolylineOptions options : polylineOptionses) {
googleMap.addPolyline(options);
}
if(Validator.isNotNull(option)){
//List<LatLng> points = option.getPoints();
googleMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
#Override
public void onMapLoaded() {
LatLng startPoint = new LatLng(position.get(0).getLatitude(), position.get(0).getLongitude());
googleMap.addMarker(new MarkerOptions().position(startPoint).title("start").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
mapBounds.include(startPoint);
LatLng endPoint = new LatLng(position.get(position.size() - 1).getLatitude(), position.get(position.size() - 1).getLongitude());
mapBounds.include(endPoint);
googleMap.addMarker(new MarkerOptions().position(endPoint).title("finish").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
googleMap.setPadding(15, 205, 10, 110);
googleMap.moveCamera(CameraUpdateFactory.newLatLngBounds(mapBounds.build(), 0));
//googleMap.animateCamera(CameraUpdateFactory.newLatLngBounds(mapBounds.build(), 10));
googleMap.moveCamera(CameraUpdateFactory.zoomOut());
}
});
}
}
}
supportMapFragment.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap googleMap) {
if (Validator.isNotNull(googleMap)) {
googleMap.setMyLocationEnabled(false);
googleMap.clear();
googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng latLng) {
if (activity.preferences.isSaveScreen()) {
facebook.setChecked(false);
twitter.setChecked(false);
activity.replaceFragment(new FullMapFragment(), null);
}
if (!activity.preferences.isSaveScreen()) {
activity.preferences.setHistoryScreen(true);
activity.replaceFragment(new FullMapFragment(), null);
}
}
});
if (gps) {
nonGpsSummary.setVisibility(View.GONE);
List<HistoryMap> historyMaps = new ArrayList<HistoryMap>();
if (Validator.isNotNull(activity.preferences.getUserHistory().getHistoryMaps())) {
historyMaps.addAll(Arrays.asList(activity.preferences.getUserHistory().getHistoryMaps()));
}
if (historyMaps.size() > 0) {
if (Validator.isNotNull(googleMap)) {
drawRouteIntoMap(historyMaps, googleMap);
}
} else {
mapFrame.setVisibility(View.GONE);
}
} else {
gpsSummary.setVisibility(View.GONE);
}
}
}
});
this question is in relation with zoom over specific route google map.
by using that i get proper route with mapbounds but i m not getting why this screen is displaying.
i am not receiving cordinates 0.0 i debug that,api key is also proper.

You are calling moveCamera twice. The first one tries to move the camera but the second one doesn't wait for the first one to end and performs the zoom out.
This may not happen all the times and may behave differently on different devices.
The best option is to set a padding on your CameraUpdateFactory.newLatLngBounds(mapBounds.build(), 0) instead of 0

This problem occurs when your coordinates are not properly set. Make sure the coordinates that you are using is pointing in the land to get the maps correctly. Another possible reason is your API key is not working, try to generate new API key for this project.
For more information, check these related SO questions.
Android google maps return error and blue screen
Blue screen in Android Google Maps

IllegalStateException when creating markers on google map

Hi I am trying to display some marker points on a Google map v2. All is good until I found this bug. For some reason if I load the map with 2 pointers on it and then close it and reload it again I get this message:
"IllegalStateException no included points"
This error appears when I call the:
LatLngBounds bounds = builder.build();
This is how I put the points on the map:
// Point the map's listeners at the listeners implemented by the cluster
// manager.
googleMap.setOnMarkerClickListener(mClusterManager);
builder = new LatLngBounds.Builder();
for (Ad ad : Constants._results)
{
builder.include(new LatLng(ad.getLat(), ad.getLon()));
}
googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
#Override
public void onCameraChange(CameraPosition cameraPosition)
{
int padding = 50; // offset from edges of the map in pixels
try{
LatLngBounds bounds = builder.build();
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
googleMap.moveCamera(cu);
googleMap.setOnCameraChangeListener(mClusterManager);
}catch (Exception e)
{
e.printStackTrace();
}
}
});
Can anyone help out?
LogCat:
-30 14:11:11.267 20651-20874/com.myapp.user E/com.newrelic.agent.android﹕ Error in fireOnHarvestFinalize
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
at java.util.HashMap$EntryIterator.next(HashMap.java:843)
at java.util.HashMap$EntryIterator.next(HashMap.java:841)
at com.newrelic.agent.android.metric.MetricStore.getAllByScope(MetricStore.java:63)
at com.newrelic.agent.android.metric.MetricStore.getAllUnscoped(MetricStore.java:74)
at com.newrelic.agent.android.harvest.HarvestDataValidator.ensureActivityNameMetricsExist(HarvestDataValidator.java:41)
at com.newrelic.agent.android.harvest.HarvestDataValidator.onHarvestFinalize(HarvestDataValidator.java:15)
at com.newrelic.agent.android.harvest.Harvester.fireOnHarvestFinalize(Harvester.java:580)
at com.newrelic.agent.android.harvest.Harvester.execute(Harvester.java:271)
at com.newrelic.agent.android.harvest.HarvestTimer.tick(HarvestTimer.java:73)
at com.newrelic.agent.android.harvest.HarvestTimer.tickIfReady(HarvestTimer.java:56)
at com.newrelic.agent.android.harvest.HarvestTimer.run(HarvestTimer.java:32)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:279)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:152)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)

I think your problem lies here
for (Ad ad : Constants._results)
{
builder.include(new LatLng(ad.getLat(), ad.getLon()));
}
Constants._results must be empty, so there are no LatLng points in your builder. Debug and check.

Run marker task on UI thread.
runOnUiThread(new Runnable() {
#Override
public void run() {
//Add your marker here...
}
});