Google Maps Javascript Draw Multiple Routes

Okay, so I managed to reproduce what you are experiencing and found what was causing your problem. In the code you provided, notice this line in MapsActivity:

          target = new PicassoMarker(location_marker);                  

I presumed that you are using a global single variable for target. I added some logs and managed to see that the only Marker that gets the image loaded using Picasso is the last Marker in the for loop.

The reason is because, every time you enter the loop, the value of target changes to the newer PicassoMarker that you have, making the onBitmapLoaded of the previous PicassoMarker you have useless, since it no longer has a target. :(

So what I did is, I just added a List<Target> variable (make sure you don't forget to initialize it) to store the instances of the targets. In the line where that I specified earlier, I just added the code to store the value of the target to the list, like so:

          Target target = new PicassoMarker(location_marker); targets.add(target);                  

Tested it on my emulator and it loads the images to all the Markers.

EDIT

Here is the Activity code I used to reproduce your error and then modified it to make it work:

          public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {      private GoogleMap mMap;      Intent i;     MarkerOptions markerOption;     List<Target> targets;     HashMap<Marker, MyMarker> mMarkersHashMap;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_maps);          mMarkersHashMap = new HashMap<>();         targets = new ArrayList<>();          // Obtain the SupportMapFragment and get notified when the map is ready to be used.         SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()                 .findFragmentById(R.id.map);         mapFragment.getMapAsync(this);     }       /**      * Manipulates the map once available.      * This callback is triggered when the map is ready to be used.      * This is where we can add markers or lines, add listeners or move the camera. In this case,      * we just add a marker near Sydney, Australia.      * If Google Play services is not installed on the device, the user will be prompted to install      * it inside the SupportMapFragment. This method will only be triggered once the user has      * installed Google Play services and returned to the app.      */     @Override     public void onMapReady(GoogleMap googleMap) {         mMap = googleMap;          // Add a marker in Sydney and move the camera         // LatLng sydney = new LatLng(-34, 151);         // mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));         // mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));         ArrayList<MyMarker> markers = new ArrayList<MyMarker>();         MyMarker m1 = new MyMarker(new LatLng(-34, 151.1), "https://developer.chrome.com/extensions/examples/api/idle/idle_simple/sample-128.png");         MyMarker m2 = new MyMarker(new LatLng(-34, 151.2), "https://developer.chrome.com/extensions/examples/api/idle/idle_simple/sample-128.png");         MyMarker m3 = new MyMarker(new LatLng(-34, 151.3), "https://developer.chrome.com/extensions/examples/api/idle/idle_simple/sample-128.png");          markers.add(m1);         markers.add(m2);         markers.add(m3);          plotMarkers(markers);          mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {             @Override             public boolean onMarkerClick(Marker marker) {                 Log.d(MapsActivity.class.getSimpleName(), "MARKER Longitude: " + marker.getPosition().longitude);                 return false;             }         });     }      public void plotMarkers(ArrayList<MyMarker> markers) {         if (markers.size() > 0) {             for (MyMarker myMarker : markers) {                  markerOption = new MarkerOptions().position(new LatLng(myMarker.getmLatitude(), myMarker.getmLongitude()));                 Marker location_marker = mMap.addMarker(markerOption);                  Target target = new PicassoMarker(location_marker);                 targets.add(target);                 Picasso.with(MapsActivity.this).load(myMarker.getmIcon()).resize(84, 125).into(target);                  mMarkersHashMap.put(location_marker, myMarker);                  i = getIntent();                 if (i.getBooleanExtra("maps", true)) {                     // buttonNavigasi.setVisibility(View.VISIBLE);                      location_marker.setTitle(i.getStringExtra("nama"));                     LatLng dest = new LatLng(myMarker.getmLatitude(), myMarker.getmLongitude());                     mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(dest, 8f));                 } else {                     Log.d(MapsActivity.class.getSimpleName(), "In else{}");                     // mMap.setInfoWindowAdapter(new MarkerInfoWindowAdapter());                 }             }         }     } }                  

Google Maps Javascript Draw Multiple Routes

Source: https://coderedirect.com/questions/215459/using-google-maps-3-api-to-get-multiple-routes-on-a-map

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