Map activity in android

Question 1

Old MapView has been depreciated. You can't create a new Map key for publishing your app. You have to use new Google Maps for Android v2 API. Here's a link to the documents and example. https://developers.google.com/maps/documentation/android/start

Question 2

make sure Google Repository && Google play Services is up to Date

add below to Project level Gradle

 classpath 'com.google.gms:google-services:3.0.0'

and below two statements to App Level Gradle

compile 'com.google.android.gms:play-services-location:11.0.1'//for location
compile 'com.google.android.gms:play-services-maps:11.0.1'//for maps
compile 'com.google.android.gms:play-services-places:11.0.1'//for places

And add permission in Manifest

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

add below statment in tag

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

    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="@string/google_map_key" />

MapsActivity.class

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback,
        GoogleApiClient.OnConnectionFailedListener {

    private Context mContext;
    private EditText searchPlaceEt;
    private Button saveLocationBtn;
    private GoogleMap mMap;
    private GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_map);

        mContext = MapsActivity.this;

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                buildGoogleApiClient();

                if(mMap != null)
                    mMap.setMyLocationEnabled(true);
            } else {
                //Request Location Permission
                ///checkLocationPermission();
            }
        } else {
            buildGoogleApiClient();
            if(mMap != null)
                mMap.setMyLocationEnabled(true);
        }
    }

    private void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient
                .Builder(this)
                .addApi(Places.GEO_DATA_API)
                .addApi(Places.PLACE_DETECTION_API)
                .enableAutoManage(this, this)
                .build();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        // Add a marker in Sydney, Australia,
        // and move the map's camera to the same location.
        mMap = googleMap;

        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

        LatLng sydney = new LatLng(-33.852, 151.211);

        googleMap.addMarker(new MarkerOptions().position(sydney)
                .title("Marker in Sydney"));
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));

        googleMap.addMarker(new MarkerOptions().
                position(mMap.getCameraPosition().target).title("Near to Sydney"));

        mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
            @Override
            public void onMapLongClick(LatLng latLng) {
                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latLng);
                markerOptions.draggable(true);
                markerOptions.title("Add a hazard here.");
                markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
                mMap.addMarker(markerOptions);
                ///mHazardsMarker = mMap.addMarker(markerOptions);
            }
        });

        mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {
                LatLng objLoc = marker.getPosition();
                return false;
            }
        });

        mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
            @Override
            public void onInfoWindowClick(Marker marker) {
                LatLng objLoc = marker.getPosition();
            }
        });

        mMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
            @Override
            public void onMarkerDragStart(Marker marker) {
            }

            @Override
            public void onMarkerDrag(Marker marker) {
                marker.setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
            }

            @Override
            public void onMarkerDragEnd(Marker marker) {
                marker.setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
            }
        });
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}

fragment_map

<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"
    tools:context=".maptest.MapsActivity">

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />
</LinearLayout>

Question 3

I could do this with the Google Map Activity bundled with Android Studio 1.2.1.1. I created a Google Maps Activity and followed the instructions as below:

Created the API Key following the instructions in google_maps_api.xml

To get one, follow this link, follow the directions and press "Create" at the end:

https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID&r=XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY%3Bnpackagename

You can also add your credentials to an existing key, using this line:
XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY:XY;newmapscreen.avapps.nbapl.com.newmapscreen

Once you have your key (it starts with "AIza"), replace the "google_maps_key"
string in this file.
-->
<string name="google_maps_key" translatable="false" templateMergeStrategy="preserve">
    AIzaXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
</string>

After that, I ensured all the dependencies are there in Android Manifest, build.gradle. See this answer for details.

In your MapActivity.java, you can add additional markers, and use the Android Google Maps API V2 features to enhance your map.

(replace XY:XY ...with whats in your google_maps_api.xml)