Develop Reference

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" />

Camera Update Factory is Not Initiliaze in Google Map

i had a map in my android app.....me and my friend is working on that he had created a map nd it is display in his emalutor...when i import same project in my eclipse ..nd run it gives me error that camera update factory is not initilze...but my partner is working on same map....i cant understand what is the problem in my emalutor or eclipse or any other reason..if any one know then help me
my xml file is
<LinearLayout 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:orientation="vertical" >
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</LinearLayout>
i had called this from my map activity
MapsInitializer.initialize(this);
getLayoutInflater().inflate(R.layout.activity_main_map, frameLayout);
googleMap = supportMapFragment.getMap();
googleMap.animateCamera(CameraUpdateFactory.zoomTo(20.0f));
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
googleMap.getUiSettings().setZoomGesturesEnabled(true);

The getMap() method is async , your next line will be executed before the map is ready , do this:
supportMapFragment.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap googleMap) {
googleMap.animateCamera(CameraUpdateFactory.zoomTo(20.0f));
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
googleMap.getUiSettings().setZoomGesturesEnabled(true);
}
}

SupportMapFragment return null on Android studio

I move my application eclipse to android studio. My code works perfect on Eclipse but on Android studio
mapView = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
return null
my xml is here
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:ads="http://schemas.android.com/apk/res-auto"
>
<com.google.android.gms.ads.AdView
android:id="#+id/adMob"
android:layout_width="fill_parent"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="#string/admob_unit_id" />
<fragment
android:id="#+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>
why it return null?
I searched and compileSdkVersion 21 cause it. But if I change it 19 still return null

getMap() is not guaranteed to return a map instance. Use getMapAsync(OnMapReadyCallback) where the callback will be invoked once the map is ready and you're guaranteed it won't be null. This is available since Google Play Services library v6.5.
When using this approach get rid of your mapView variable, the callback will receive a map reference anyway. Also note that SupportMapFragment is not MapView is not GoogleMap (I'm referring to the misnamed variable here, be careful.).
EDIT: Suggested solution:
public class MainActivity extends ActionBarActivity {
SupportMapFragment mMapFragment;
#Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
mMapFragment = getSupportFragmentManager().findFragmentById(R.id.map);
// etc.
}
public void doSomethingWithMap() {
mMapFragment.getMapAsync(new OnMapReadyCallback() {
#Override
public void onMapReady(GoogleMap googleMap) {
// do whatever you need with the map
}
});
}
}
The point is when you need to access the map, you ask the fragment for it, and it will be delivered to you via a callback.

Android fail to load google map in fragment

I'm trying to use google map in fragment, but I meet a problem I don't understand.
I don't arrive to load the map in this line :
gMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
This line seems to return always null...
I tried to use MapFragment inseatd of SupportMapFragment, but it's not possible.
How to resolve it ?
To explain why i want to show it in a fragment, it's because i'm using a navigationdrawer, and one of my item needs to show the map.
thx,
EDIT : My xml :
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"/>

I think you should call with getsupportFragmentManager not with getFragmentManager otherwise it will return null always

If you are using SupportMapFragment, you need to change your layout!
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
This is a basic example using SupportMapFragment:
public class MainActivity extends ActionBarActivity implements OnMapReadyCallback{
private SupportMapFragment map;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
map.getMapAsync(this);//remember getMap() is deprecated!
}
#Override
public void onMapReady(GoogleMap map) {
map.moveCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(47.17, 27.5699), 16));
map.addMarker(new MarkerOptions() .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)).anchor(0.0f, 1.0f) // Anchors the marker on the bottom left
.position(new LatLng(47.17, 27.5699))); //Iasi, Romania
map.setMyLocationEnabled(true);
}
}
and change the reference in your layout:
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />

I dont think it is possible as google map contains a < fragment> tag. See here why:
Note: You cannot inflate a layout into a fragment when that layout includes a . Nested fragments are only supported when added to a fragment dynamically.
Some people in SO however managed to show map in a fragment, but the solution was hacky.

Mapfragment findFragmentById always null

I have problems to access the fragment of the map.
getFragmentManager().findFragmentById(R.id.map)) returns always null.
I don't know why.
What's the problem?
Thank you!
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/tvNombreCentro"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:tag="tag_fragment_map" />
</LinearLayout>
And in the activity after the setContentView I try to access to the map, but I receive an exception
public class Mapa extends Activity {
private GoogleMap mMap;
private ActionBar ab;
private TextView tvNombreCentro;
private TextView tvTelefonoValor;
private TextView tvEMailValor;
private TextView tvWebValor;
private TextView tvDireccionValor;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mapa_centro);
GoogleMap mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
}

use this way:
SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = mapFrag.getMap();
here is full code with sample:

In case your problem is not solved, try this :
As you are using SupportMapFragment, while retrieving map, use
GoogleMap mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
Also, change
public class Mapa extends Activity {
to
public class Mapa extends FragmentActivity {

I had a similar problem when trying to get MapFragment but getting null because the device didn't have Google Play Services updated.

Change in the layout
android:name = "com.google.android.gms.maps.SupportMapFragment"
by
android:name = "com.google.android.gms.maps.MapFragment".
Or, you can use getSupportFragmentManager() instead of getFragmentManager().