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POHow to have two Google Maps in the same Android Application
 

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  1. POHow to have two Google Maps in the same Android Application
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    <p>I've a problem with my application. Everything work very well, but when i need to add two marker in a new istance of a Google Map is not possible because mMap = (mMapFragment).getMap() return null (i've seen with Log.i) I already have another Map in the first activity that show all the nearest Markers and it work VERY well.</p> <p>This is my DrawPathActivity</p> <pre><code>public class DrawPathActivity extends FragmentActivity { private GoogleMap mMap; private GoogleMapOptions options = new GoogleMapOptions(); private MapFragment mMapFragment; private PolylineOptions PolyOpt = new PolylineOptions(); private Polyline polyline; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); mMapFragment = MapFragment.newInstance(); setContentView(R.layout.activity_draw_path); options.mapType(GoogleMap.MAP_TYPE_NORMAL) .compassEnabled(true) .scrollGesturesEnabled(true) .zoomGesturesEnabled(true); MapFragment.newInstance(options); mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map1)).getMap(); android.app.FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction(); fragmentTransaction.add(R.id.map1, mMapFragment); fragmentTransaction.commit(); mMap.setMyLocationEnabled(true); Intent intent = getIntent(); LatLng cpPos = new LatLng(intent.getExtras().getDouble("cp_lat"), intent.getExtras().getDouble("cp_lon")); LatLng poiPos = new LatLng(intent.getExtras().getDouble("POI_lat"), intent.getExtras().getDouble("POI_lon")); addMarkers(intent); PolyOpt.add(cpPos) .add(poiPos) .width(10) .color(Color.BLUE) .geodesic(true); polyline = mMap.addPolyline(PolyOpt); String url = makeURL(cpPos.latitude, cpPos.longitude, poiPos.latitude, poiPos.longitude); drawPath(url, true); } private void addMarkers(Intent intent) { Log.i("mMap ini", String.valueOf(mMap)); Log.i("mMapFragment", String.valueOf(mMapFragment)); LatLng cpPos = new LatLng(intent.getExtras().getDouble("cp_lat"), intent.getExtras().getDouble("cp_lon")); LatLng poiPos = new LatLng(intent.getExtras().getDouble("POI_lat"), intent.getExtras().getDouble("POI_lon")); mMap = (mMapFragment).getMap(); &lt;&lt;&lt;---- mMap IS NULL!!! Log.i("mMap", String.valueOf(mMap)); mMap.addMarker(new MarkerOptions() .position(cpPos) .icon(BitmapDescriptorFactory.fromResource(R.drawable.youarehere))); mMap.addMarker(new MarkerOptions() .position(poiPos) .title(intent.getExtras().getString("POI_name")) .icon(BitmapDescriptorFactory.fromResource(R.drawable.poi_serena))); } public static LatLng locationToLatLng(Location loc) { if(loc != null) return new LatLng(loc.getLatitude(), loc.getLongitude()); return null; } public String makeURL (double sourcelat, double sourcelog, double destlat, double destlog ){ StringBuilder urlString = new StringBuilder(); urlString.append("http://maps.googleapis.com/maps/api/directions/json"); urlString.append("?origin=");// from urlString.append(Double.toString(sourcelat)); urlString.append(","); urlString .append(Double.toString( sourcelog)); urlString.append("&amp;destination=");// to urlString .append(Double.toString( destlat)); urlString.append(","); urlString.append(Double.toString( destlog)); urlString.append("&amp;sensor=false&amp;mode=driving&amp;alternatives=true"); return urlString.toString(); } public void drawPath(String result, boolean withSteps) { try { //Tranform the string into a json object final JSONObject json = new JSONObject(result); JSONArray routeArray = json.getJSONArray("routes"); JSONObject routes = routeArray.getJSONObject(0); JSONObject overviewPolylines = routes.getJSONObject("overview_polyline"); String encodedString = overviewPolylines.getString("points"); List&lt;LatLng&gt; list = decodePoly(encodedString); for(int z = 0; z&lt;list.size()-1;z++){ LatLng src= list.get(z); LatLng dest= list.get(z+1); Polyline line = mMap.addPolyline(new PolylineOptions() .add(new LatLng(src.latitude, src.longitude), new LatLng(dest.latitude, dest.longitude)) .width(10) .color(Color.BLUE).geodesic(true)); } if(withSteps) { JSONArray arrayLegs = routes.getJSONArray("legs"); JSONObject legs = arrayLegs.getJSONObject(0); JSONArray stepsArray = legs.getJSONArray("steps"); //put initial point for(int i=0;i&lt;stepsArray.length();i++) { Step step = new Step(stepsArray.getJSONObject(i)); mMap.addMarker(new MarkerOptions() .position(step.location) .title(step.distance) .snippet(step.instructions) .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE))); } } } catch (JSONException e) { } } </code></pre> <p>This is the xml layout of this class</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;CheckBox android:id="@+id/satellite" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/satellite" /&gt; &lt;/LinearLayout&gt; &lt;fragment android:id="@+id/map1" android:layout_width="match_parent" android:layout_height="match_parent" class="com.google.android.gms.maps.MapFragment" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Someone can help me? And can explain how the map is null? Because I can't add the two Marker on the map, and I can't finish my job.</p> <p>Thanks to all.</p>
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    2. CO@Zabri Done, sorry!
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