Develop Reference

Google Maps Display

Iam practicing on Google Maps for android development. I have followed the steps as in https://developers.google.com/maps/documentation/android-api/map-with-marker
While when playing the app I got the screen like this below, no marker and the map cannot show any thing
My code as following:
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
// Add a marker in Sydney, Australia,
// and move the map's camera to the same location.
LatLng sydney = new LatLng(-33.852, 151.211);
googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
******** . XML Layout ************
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.ae.map_04.MainActivity">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment" />
</LinearLayout>

This is most likely an API Key issue. You can find some guidance here: Android Studio - Google map still blank on real Android device on release apk
If that does not work, try a new API Key.

Google maps error inflating, Android

I get the following error when I try to leave fragment which contains map (on back button press).
ERROR: mapInflater->Binary XML file line #7: Error inflating class fragment
Bellow is onCreate() method of fragment where the map is placed. And also there is a xml code of layout.
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
apiRequestManager = ApiRequestManager.getInstance();
fragmentHandler = FragmentHandlerActivityMain.getInstance(getActivity());
session = new SessionManager(App.getInstance().getApplicationContext());
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(getString(R.string.maps_fragment_toolbar_name));
Handler mainHandler = new Handler();
Runnable myRunnable = new Runnable() {
#Override
public void run() {
try {
SupportMapFragment maps = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.mapView);
if (maps != null)
maps.getMapAsync(MapsFragment.this);
} catch (Exception ex) {
LogUtil.getInstance().add(LogUtil.ERROR,
TAG, "onCreateMaps", ex);
}
}
};
mainHandler.post(myRunnable);
}
Log is pointing on this layout on fragment (line 7).
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app1="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".salesman.fragments.MapsFragment">
<fragment
android:id="#+id/mapView"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"/>
</FrameLayout>

You are trying to getChildFragmentManager() instade of getSupportFragmentManager().
Need to change In Java File :
1). You need to implements OnMapReadyCallback in Your Fragment.
2). Get SupportMapFragment from View.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
3). Overrid onMapReady(GoogleMap googlMap) Method.
#Override
public void onMapReady(GoogleMap googleMap) {
// Add a marker in Sydney, Australia,
LatLng sydney = new LatLng(-33.852, 151.211);
googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
// and move the map's camera to the same location.
googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
In XML File :-
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app1="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".salesman.fragments.MapsFragment">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</FrameLayout>
Please check the updated answer as per below comment:
Now try to set MapView insted of fragment because if you use fragment inside fragment it creates lot of issues.
Need to change in JAVA Code : // Initialize GoogleMap myMap; MapView mMapView;
// OnCreateView Method MapsInitializer.initialize(this.getActivity()); mMapView = (MapView) rootView.findViewById(R.id.map); mMapView.onCreate(savedInstanceState); mMapView.getMapAsync(this);
#Override public void onPause() { super.onPause(); mMapView.onPause(); }
#Override public void onPause() { super.onPause(); mMapView.onPause(); }
#Overridepublic void onResume() { super.onResume(); mMapView.onResume(); }
Need to change in XML File :
<com.google.android.gms.maps.MapView android:id="#+id/map" android:layout_width="match_parent" android:layout_height="match_parent" />

Maps API Fragment not showing Marker in DrawerLayout

I'm new with StackOverflow and Maps API. I'm developing an app where a Drawer Layout is being used. I want to use one of the Drawer fragments to show Maps and work with Markers.
private SupportMapFragment mapFragment;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mapFragment = (SupportMapFragment)
getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_maps, container, false);
mapFragment.getMapAsync(this);
return view;
}
#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));
}
this is the fragment_maps.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.labcontrol.lca.view.MapsFragment">
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.labcontrol.lca.controller.MainActivity" />
</FrameLayout>
In the official guide they made an example using an Activity, as you can see I tried to do it inside a fragment. is it possible?
The result is this: maps is working properly, but I can't see the Marker I created, and I spent too many hours trying to figure out why.
The only thing make me suspicious is this error when playing with Maps on the phone and changing the camera:
W/Google Maps Android API: GLHudOverlay deprecated; draw(): no-op
Found out it's a common issue these days, a very new bug. Somebody knows how to get it up and running? Is there something wrong with the code?
thanks a lot

Android map in fragment nullpointer

In my project im trying to implementthis solution for managing a map in a dynamic added fragment.
public class MapFragment extends Fragment {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
static final LatLng KIEL = new LatLng(53.551, 9.993);
private GoogleMap map;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v =inflater.inflate(R.layout.fragment_map, container, false);
map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_arrow)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(KIEL, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
return v;
}
}
My view:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/ColorBackground"
tools:context="com.example.sven.questy.GameFragments.MapFragment">
<fragment
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
WHen i run the app i get a nullpointer exception on:
map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
The id of the map = map ( android:id="#+id/map").
Why the nullpointer?

Since you are using nested fragments, you should use getChildFragmentManager()
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
And I recommend you to use getMapAsync method, because getMap is deprecated
mapFragment.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap googleMap) {
setupMap(googleMap);
}
});

You need to use findViewById on the view you get, not using the fragment manager. The map is attached to the view
View v =inflater.inflate(R.layout.fragment_map, container, false);
map = v.findViewById(R.id.map))
.getMap();

Google Maps returns null

I have a Google Maps Activity. suddently it is shutting down because getMap() (java null pointer exeption) doesn't seem to work. I reinstalled some older apks that worked fine and but yet these are shutting down to. So it has to be something on the device or so, what can be the reason?
private GoogleMap googleMap;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
if(googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
}
Here is the xml file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"/>
Logcat:
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.mareike.cityexplorer/de.mareike.cityexplorer.MainActivity}: java.lang.NullPointerException
Caused by: java.lang.NullPointerException
at com.google.l.a.ce.a(Unknown Source)
at com.google.maps.api.android.lib6.d.eg.<init>(Unknown Source)
at com.google.maps.api.android.lib6.d.ef.a(Unknown Source)
at com.google.maps.api.android.lib6.d.aq.<init>(Unknown Source)
at com.google.maps.api.android.lib6.d.ft.a(Unknown Source)
at com.google.android.gms.maps.internal.l.onTransact(SourceFile:167)
at android.os.Binder.transact(Binder.java:380)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addMarker(Unknown Source)
at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source)
at de.mareike.cityexplorer.MainActivity.onCreate(MainActivity.java:88)

According to here, the getMap() method is deprecated and you need to use getMapAsync(OnMapReadyCallback) instead.
Sample code:
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap map) {
// Add a marker in Sydney, Australia, and move the camera.
LatLng sydney = new LatLng(-34, 151);
map.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 10));
}
}
and the activity_main.xml:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
For more details, please refer official doc here.

Check your layout activity_main should contains fragment having id map
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />