android google map issues

Question

I am currently building an android app. I understand the basics and I did a number of apps but now my project is bigger. My app include a number of screens with NavigationDrawer included which forces me to use an extension of Fragment class on every class I want to be displayed on my application. Here is my problem -some time ago I create an app a simple one page google maps screen and it works just fine. I want to do the same thing on the app I am currently working on but all it gives me when I go to the page is the google log at the bottom left screen and the rest is grey like view (no map is displayed).I searched for solution in a lot of places including this site and I could get as an answer was that it might have to do with my API key given to me by google.I ckecked that and I am pretty sure it is not from the key because I applied it on my one page google map app and it worked perfect.I also have all the permissions needed I checked that like 6 times.So my conclusion is there is something in the code that is preventing the map to be displayed.

Here is my code:

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class guide extends Fragment {



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // inflat and return the layout
        View v = inflater.inflate(R.layout.test, container,
                false);

        return v;
    }

    class HoldFragmentPlace extends FragmentActivity{

        private GoogleMap mMap;

        public HoldFragmentPlace(){

        }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // inflat and return the layout
        View v = inflater.inflate(R.layout.test, container,
                false);

        return v;
    }

    @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.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
        }


    }

}

I need that Fragment extension for my NavigationDrawer to work so I create an inner class and applied the code for the map there.

Here is what I have in my manifest:

     <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="@string/google_maps_key" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission         android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

And here is my xml for the map:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.gms.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        class="com.google.android.gms.maps.SupportMapFragment"
        android:layout_marginTop="-470dp" />

</LinearLayout>

I also tried a few other variations of the java code some of them does not include inner class and the result is still the same.I am either missing something very fundamental or I am misunderstanding some conception about Android.If you have read all that thank you for the spared time!

Answer 1

I suspect some part missing :

(1) Declare permission to use MAPS_RECEIVE :

<permission android:name="com.example.yourpackage.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<!-- after declare use this -->
<uses-permission android:name="com.example.yourpackage.permission.MAPS_RECEIVE"/>

(2) Missing Declare gms version variable :

  <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

(3) The API_KEY may have some problem with generation :

<meta-data
    android:name="com.google.android.maps.v2.API_KEY"
    android:value="your_key" />

Please check with above 3 suspects first : then if still error is there you can re-confirm steps to enable Google Maps from here

Check things related to API_KEY carefully

Answer 2

Check the APK signing. You have to assign a debug API key in testing and a Release API key when releasing APK. Insert the correct API key, clean and rebuild your project.

I've been there a year a go and I can assure that this was the problem. Double check your key and if it's a debug or release key.

Another thing to check is the package name of your app... Let me know if you did and still get the grey view instead of the

UPDATE:

I was trying to include everything when I realized that your problem is only in the signing phase.

You only need to get the SHA-1 fingerprint of the debug keystore and put it in your API Key dialog. And trust me there's nothing I can write that can be more clear and informative than the Google documentation.

Follow the steps in this link to get the debug certificate and the SHA-1 fingerprint.

UPDATE 2:

In order to get the SHA-1 of the keystore you might check this thread .

Answer 3

You can use SupportMapFragment to display map in your fragment.

The xml should be changed to

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" 
android:layout_width="match_parent"
android:layout_height="match_parent">


<fragment
 android:id="@+id/mapView"
android:layout_marginTop="-470dp"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>

and your class would be like below

public class guide extends Fragment {

private GoogleMap mMap;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // inflat and return the layout
    View v = inflater.inflate(R.layout.test, container, false);

    ((SupportMapFragment) getFragmentManager()
            .findFragmentById(R.id.mapView)).getMapAsync (new OnMapReadyCallback(){
                @Override
                public void onMapReady(final GoogleMap map) {
                    this.mMap = map;
                    mMap.setMyLocationEnabled(true);
                    setUpMap();
                }
            });


    return v;
}

private void setUpMap() {
        mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
    }

}

Note: Please update your google play services if you dont find the getMapAsync method for your SupportMapFragment.