Android Google Maps Tutorial

Android allows us to implement Google Maps in our application.

Steps to Implement Google Map in our Application

Step 1:

Create A new Project in Android Studio and Select Google Maps Activity.



GoogleMapsActivity will by default give you a fragment that will display a map layout with a default Activity with the below permission  Manifest.

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

It will also give a file named google_maps_api.xml as below where we need to pass an API  key which will enable your map display.

Step 2:

Steps to generate Google Maps API Key

Go to web browser and search for Google Developer Console and click on the below link



 

It will open a console like below and then click  on Select a project, It will open a Dialog and then click on plus sign to create a new project.





Fill all the details of your project agree the terms and click CREATE

On Left Panel click on Library it will open the below layout click on Google Maps API and enable it.

 



Create credentials as below.





It will generate an API Key that you need to copy and paste in your google_maps_api.xml.

The below code comes by default when you select GoogleMap Activity.

activity_maps.xml

<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="eazy.googlemapsexample.MapsActivity" />

 

MapsActivity.java

package eazy.googlemapsexample;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
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 MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
       

        mapFragment.getMapAsync(this);
    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @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));
    }
}

 

onMapReady(GoogleMap googleMap):- 

It is an overriden method which is called when the map is ready to be used.

LatLng is a class that takes lattitude and longtitude of a location.

addMarker():- is used to add Marker on the map according to the defined latlng.

moveCamera():-takes the focus to the location of specified latlng.

Some more methods that can be used with GoogleMap

mMap.getUiSettings().setZoomGesturesEnabled(true);
This will provide Zoom In and Zoom Out Gestures on the Map.

mMap.getUiSettings().setZoomControlsEnabled(true);
This will display plus and minus Buttons for Zoom in and Zoom Out.

The below methods are used to set the type of view that you need to display
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

OR
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

OR
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);

OR
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);

 

IF YOU HAVE ANY SUGGESTIONS OR ANY ERRORS WHILE IMPLEMENTING , FEEL FREE TO COMMENT BELOW.