Develop Reference

Google maps v2 not initializing in fragment

I want to show my current location using Google maps v2 from a fragment however the Google maps is not initializing on start up. When i run the application, it is nor crashing but the map is not showing my current location neither is it displaying anything. I have used this code on my activity and it is fully functional.
Below is my java code:
public class MapFragment extends Fragment implements LocationListener,GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,OnMapReadyCallback {
SupportMapFragment mSupportMapFragment;
MapView mMapView;
Location mLastLocation;
Marker mCurrLocationMarker;
private MarkerOptions markerOptions;
protected GoogleApiClient mGoogleApiClient;
private LatLng latLng;
public GoogleMap mMap;
private Marker marker;
LocationRequest mLocationRequest;
private GoogleMap googleMap;
private TextView lastTrip, lastDeliveryText, lastDelivery, lastAmountText, lastAmount, kes,
todayTotal, totalDeliveryText, totalDelivery, totalAmount, totalAmountText;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
buildGoogleApiClient();
// inflat and return the layout
View v = inflater.inflate(R.layout.map_fragment, container,
false);
mSupportMapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.mapwhere);
if (mSupportMapFragment == null) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
mSupportMapFragment = SupportMapFragment.newInstance();
fragmentTransaction.replace(R.id.mapwhere, mSupportMapFragment).commit();
}
if (mSupportMapFragment != null) {
mSupportMapFragment.getMapAsync(this);
}
return v;
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Log.d("one","one");
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//mMap.getUiSettings().setZoomControlsEnabled(true);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
Log.d("two","two");
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
} else {
Log.d("three","three");
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
Log.d("four","four");
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(Places.GEO_DATA_API)
.build();
mGoogleApiClient.connect();
}
#Override
public void onLocationChanged(Location location) {
Log.d("five","five");
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//mMap.getUiSettings().setZoomControlsEnabled(true);
final Double lat = location.getLatitude();
final Double lng = location.getLongitude();
Log.d("LATLANGz", lat + "|" + lng);
latLng = new LatLng(lat, lng);
markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Positionn");
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mMap.setMyLocationEnabled(false);
markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.user_location));
marker = mMap.addMarker(markerOptions);
//move map camera_main
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(12));
}
#Override
public void onResume() {
super.onResume();
Log.d("hey2","hey2");
// mMapView.onResume();
mSupportMapFragment.onResume();
}
#Override
public void onPause() {
super.onPause();
Log.d("hey1","hey1");
// mMapView.onPause();
mSupportMapFragment.onPause();
}
/* #Override
public void onDestroy() {
super.onDestroy();
// mMapView.onDestroy();
mSupportMapFragment.onDestroy();
}*/
#Override
public void onLowMemory() {
super.onLowMemory();
// mMapView.onLowMemory();
mSupportMapFragment.onLowMemory();
}
#Override
public void onDetach() {
Log.d("detach", "detach");
super.onDetach();
mSupportMapFragment.onDetach();
}
#Override
public void onConnected(#Nullable Bundle bundle) {
Log.d("six","six");
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (mGoogleApiClient.isConnected()){
Log.d("seven","six");
if (ContextCompat.checkSelfPermission(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}

first of all Chaeck permission in manifest
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
then check method for current location
private GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
marker = map.addMarker(new MarkerOptions().position(loc));
if(map != null){
map.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
}
}
};
then use
mMap.setOnMyLocationChangeListener(myLocationChangeListener);
and be patience map take laoding time depend on you network speed
comment if any query

First check your permissions and your google api key in your manifest
Your xml layout must be something like this without any thing else:
. <fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
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.isg_biz.isg_tracking.MainActivity" />
You have to implement OnMapReadyCallback, then
your code should be something like this in onCreate() :
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
Do not to copy and past the same xml code literally you have to change (tools : .....) to same that exist in your xml
for documentation, java code & more Please read :
https://developers.google.com/maps/documentation/android-api/map-with-marker

How to addMarker directly on GoogleMap after click button setMyLocationEnabled?

I made a code.
In this code, when i click a map, there will be a marker on clicked point.
This is my Code
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(final GoogleMap googleMap) {
mMap = googleMap;
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
Toast.makeText(getApplicationContext(), "oh, no", Toast.LENGTH_LONG).show();
}
googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
String lat = String.valueOf(point.latitude);
String lng = String.valueOf(point.longitude);
MarkerOptions marker = new MarkerOptions().position(
new LatLng(point.latitude, point.longitude)).title("ok");
mMap.addMarker(marker);
}
});
}
}
Question :
What i want is that when i click SetMylocationEnable button, there also added a new marker. And because i want marker is only one in whole map, another marker that has been in the map before is to be removed. How can i do it? Would you teach me?
You can see what button i saying is, in picture. (picture is from : Enable my location icon Googlemap v2)

mMap.setOnMyLocationButtonClickListener(new OnMyLocationButtonClickListener() {
#Override
public boolean onMyLocationButtonClick() {
Location location = getLocation();
MarkerOptions marker = new MarkerOptions().position(
new LatLng(location.getLatitude(), location.getLongitude())).title("ok");
mMap.addMarker(marker);
return true;
}
});
private Location getLocation() {
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
return locationManager.getLastKnownLocation(locationManager
.getBestProvider(criteria, false));
}

keep a reference to the marker, if the reference is null then create the marker as you have done, if it is not, then edit the marker and change its location

How can I get current location on mapview using fragment class?

Hello I am new in android development and i want to get current location in mapview using fragment class. when i am adding setMyLocationEnabled method it is asking for permissions and i have added all the permissions in manifest. Please help me .
Gmaps.java (fragment)
public class Gmaps extends Fragment implements OnMapReadyCallback {
private GoogleMap googleMap;
private MapView mapView;
private boolean mapsSupported = true;
private GoogleApiClient mGoogleApiClient;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MapsInitializer.initialize(getActivity());
if (mapView != null) {
mapView.onCreate(savedInstanceState);
}
initializeMap();
}
private void initializeMap() {
if (googleMap == null && mapsSupported) {
mapView = (MapView) getActivity().findViewById(R.id.map);
googleMap = mapView.getMap();
double latitude = 0.00;
double longitude = 0.00;
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Marker");
googleMap.addMarker(marker);
CameraPosition cameraPosition = new CameraPosition.Builder().target(
new LatLng(0, 0)).zoom(12).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
googleMap.getUiSettings().setZoomControlsEnabled(true); // true to enable
googleMap.getUiSettings().setZoomGesturesEnabled(true);
googleMap.getUiSettings().setCompassEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
googleMap.getUiSettings().setRotateGesturesEnabled(true);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final FrameLayout p = (FrameLayout) inflater.inflate(R.layout.fragment_gmaps, container, false);
mapView = (MapView) p.findViewById(R.id.map);
return p;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
#Override
public void onResume() {
super.onResume();
mapView.onResume();
initializeMap();
}
#Override
public void onPause() {
super.onPause();
mapView.onPause();
}
#Override
public void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
#Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
#Override
public void onMapReady(GoogleMap googleMap) {
}
In Manifest, I have added all these permissions used for google map services

According to the documentation:
If the device is running Android 6.0 or higher, and your app's target SDK is 23 or higher: The app has to list the permissions in the manifest, and it must request each dangerous permission it needs while the app is running. The user can grant or deny each permission, and the app can continue to run with limited capabilities even if the user denies a permission request.
That's the reason why althought you have declared the permissions in your manifest file you still need to ask for them at runtime.
As a workaround you can set a minSdkVersion < 23, but also as the documentation says:
Note: Beginning with Android 6.0 (API level 23), users can revoke permissions from any app at any time, even if the app targets a lower API level. You should test your app to verify that it behaves properly when it's missing a needed permission, regardless of what API level your app targets.
Also, according to the Permissions Best Practices you should test against both permission models to provide a better user experience.

Try this:
public void showMap() {
mapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
if (map == null) {
map = mapFragment.getMap();
}
// Enable Zoom
map.getUiSettings().setZoomGesturesEnabled(true);
//set Map TYPE
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//enable Current location Button
map.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager)getActivity().getSystemService(getActivity().LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 2000, 0, this);
}
#Override
public void onLocationChanged(Location location) {
latitude= location.getLatitude();
longitude=location.getLongitude();
LatLng loc = new LatLng(latitude, longitude);
if (marker!=null){
marker.remove();
}
marker= map.addMarker(new MarkerOptions().position(loc).title("Sparx IT Solutions"));
map.moveCamera(CameraUpdateFactory.newLatLng(loc));
map.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
}
#Override
public void onProviderDisabled(String provider) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
Toast.makeText(getActivity().getBaseContext(), "Gps is turned off!!",
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(getActivity().getBaseContext(), "Gps is turned on!! ",
Toast.LENGTH_SHORT).show();
}
add these uses-permissions in Manifest file
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

How to get the location(LatLng/Name) in a google map at the centre of map

Guys I'm implementing google maps in my android app and instread of creating a marker i've placed a marker image in the middle of map. Now I want that whenever user drags the map i get the location at the centre of the map(where i've placed my image look like a marker).
My map activity is :
public class MapActivity extends FragmentActivity implements LocationListener {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
TextView Title;
FrameLayout goback;
Location myLocation;
LocationManager locationManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
setUpMapIfNeeded();
SupportMapFragment supportMapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mMap = supportMapFragment.getMap();
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
//try
Title=(TextView)findViewById(R.id.map_title);
Title.setText(getIntent().getExtras().getString("Header"));
goback=(FrameLayout)findViewById(R.id.frame_layout);
setUpMapIfNeeded();
// mMap.setMyLocationEnabled(true);
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
}
#Override
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.marker);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(5));
CameraPosition ll=mMap.getCameraPosition();
Toast.makeText(getApplicationContext(),""+ll,Toast.LENGTH_LONG).show();
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
please help me in doing so, thank you :)

First you can get referance of your map container, and calculate center point by dividing 2 width and height.
View containerView=findViewById(R.id.mapContainer);
LatLng centerPoint= this.map.getProjection().fromScreenLocation(new Point(((int)containerView.getWidth/2),((int)(containerView.getHeight/2)));

you can get the center this way:
mMap.getCameraPosition().target
where mMap is the GoogleMap instance from your activity. This will return a LatLng object which basically represents the center of the map. Note that the GeoPoint class is not anymore available.
According to http://developer.android.com/reference/com/google/android/gms/maps/model/CameraPosition.html
target is "The location that the camera is pointing at." (tested it with the sample code and it worked ok for me)
Let me know if this helped you.
Cheers!

You can use this method
MapView.getProjection().fromPixels(x, y)
Where x is half your map width and y is half the height. This should return you a coordinates object which in turn will give you your longitude and latitude of the center of your map
More information on it can be seen here

google maps flagging as an input type android

I was wondering if I can capture user input in google maps. For example if I click the map there will be a mark/flag and if click my save button the mark/flag will be saved in my database?

You can add a map click listener, and place a Marker on the point that the user has tapped:
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
//save current location
latLng = point;
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
Then you can add a button, and in the button click listener you would have your code that saves the data from the current Marker to your database.
Full class code:
public class MapsActivity extends AppCompatActivity {
private GoogleMap mMap;
private Button saveButton;
private LatLng latLng;
private Marker marker;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
saveButton = (Button) findViewById(R.id.saveButton);
saveButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//check of user has placed a marker
if (latLng != null){
double lat = latLng.latitude;
double lon = latLng.longitude;
//save location data in database
//...................
Toast.makeText(MapsActivity.this, "Location Saved: " + lat + " " + lon, Toast.LENGTH_LONG).show();
}
}
});
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
//save current location
latLng = point;
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
}
}
activity_maps.xml:
<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=".MapsActivity" >
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
<Button
android:id="#+id/saveButton"
android:text="Save Current Marker Position"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"/>
</RelativeLayout>
Result after tapping the map to place a Marker, and then clicking the Save button: