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Simple Google Maps(Google Maps Android API) - Android Tutorial

In this Android Google Maps API Tutorial, we will create a simple map.To use Google Maps we need Google Maps Android API. Now don’t worry about getting an API is very easy. First lets create our android project for this Android Google Maps Tutorial.

Android Google Maps Tutorial

  • Open android studio and create a new Android Project.
  • I named it GoogleMaps. We will select Google Maps Activity from the predefined templates. (This will simplify the process of adding google map)
Google Maps Activity
  • Now click next -> and finish.
  • You will see the below screen when your android google maps tutorial project is fully loaded.
                                                                          google_maps_api.xml

  • See the highlighted text it is a link. Copy this and paste it to your browser (Make sure you are logged in your google account). You will see this.
                                                                           Developers Console

  • Click on continue.
                                                                         Android Google Maps Tutorial

  • Now click on Go to credentials.
                                                                Android Google Maps Tutorial

  • Now click on Create and you will get Your API Key.
                                                              Android Google Maps Tutorial

  • Now copy the API Key to your String inside google_maps_api.xml file. (From where you copied the link to create the API).
  • Now run your application and you will that the app Start Google Maps (See the screenshot of my output).
                                                        Android Google Maps Tutorial

To locate the location(latitude and longitude) and location marker name I have added few line of code in MapsActivity.java


OnMapReady Method( )

public void onMapReady(GoogleMap googleMap) {
        //Initializing our map
        mMap = googleMap;
        //Creating a random coordinate
        LatLng latLng = new LatLng(20.5937, 78.9629);
        //Adding marker to that coordinate
        mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        //Setting onMarkerDragListener to track the marker drag
        mMap.setOnMarkerDragListener(this);
        //Adding a long click listener to the map
        mMap.setOnMapLongClickListener(this);
    }



This method is to point out the given location(latitude and longitude)









getCurrentLocation()







private void getCurrentLocation() {



        //Creating a location object



        Location location = LocationServices.FusedLocationApi.getLastLocation



                           (googleApiClient);



        if (location != null) {



            //Getting longitude and latitude



            longitude = location.getLongitude();



            latitude = location.getLatitude();



        }



    }






This method is to point the current location(lat and long)by GPS









moveMap( )









private void moveMap() {



        //String to display current latitude and longitude



        String msg = latitude + ", "+longitude;



        //Creating a LatLng Object to store Coordinates 



        LatLng latLng = new LatLng(latitude, longitude); 



        //Adding marker to map 



        mMap.addMarker(new MarkerOptions()



                .position(latLng) //setting position



                .draggable(true) //Making the marker draggable



                .title("Current Location")); //Adding a title



        //Moving the camera 



        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));



        //Animating the camera 



        mMap.animateCamera(CameraUpdateFactory.zoomTo(15));



        //Displaying current coordinates in toast 



        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();



    }









For location marker name















In MapsActivity add few lines of code in OnCreate (here we can get idea on Shared Preferences)








final SharedPreferences sharedpreferences = getSharedPreferences(MyPREFERENCES,


Context.MODE_PRIVATE);


if(sharedpreferences.contains(Name)){


strname= sharedpreferences.getString(Name,"Default").toString();






// 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);






}else{






/* Alert Dialog Code Start*/


AlertDialog.Builder alert = new AlertDialog.Builder(this);


alert.setTitle("Location Name"); //Set Alert dialog title here


alert.setMessage("Enter Your Name Here"); //Message here






// Set an EditText view to get user input


final EditText input = new EditText(this);


alert.setView(input);






alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int whichButton) {






//You will get as string input data in this variable.


// here we convert the input to a string and show in a toast.


String srt = input.getEditableText().toString();


strname=srt;


SharedPreferences.Editor editor = sharedpreferences.edit();


editor.putString(Name, srt);


editor.commit();






} // End of onClick(DialogInterface dialog, int whichButton)


}); //End of alert.setPositiveButton






alert.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {






public void onClick(DialogInterface dialog, int whichButton) {
                    // Canceled.


dialog.cancel();
                }


}); //End of alert.setNegativeButton






AlertDialog alertDialog = alert.create();


alertDialog.show();






 // 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);


}







We will also need the following permission to be added in our manifest and replace your API key in meta data.




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













So far the full code we just created








public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,


GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener {

    private GoogleMap mMap;
    public static final String MyPREFERENCES = "MyPrefs" ;
    public static final String Name = "nameKey";
    String strname ="Current Location";
//String strname;    private double longitude;
    private double latitude;

    //Google ApiClient    private GoogleApiClient googleApiClient;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);






final SharedPreferences sharedpreferences = getSharedPreferences(MyPREFERENCES, 


Context.MODE_PRIVATE);


if(sharedpreferences.contains(Name)){






 strname= sharedpreferences.getString(Name,"Default").toString();






// 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);






}else{






/* Alert Dialog Code Start*/


AlertDialog.Builder alert = new AlertDialog.Builder(this);


alert.setTitle("Location Name"); //Set Alert dialog title here


alert.setMessage("Enter Your Name Here"); //Message here






// Set an EditText view to get user input


final EditText input = new EditText(this);


alert.setView(input);






alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int whichButton) {






//You will get as string input data in this variable.


// here we convert the input to a string and show in a toast.


String srt = input.getEditableText().toString();


strname=srt;


SharedPreferences.Editor editor = sharedpreferences.edit();


editor.putString(Name, srt);


editor.commit();






} // End of onClick(DialogInterface dialog, int whichButton)


}); //End of alert.setPositiveButton






alert.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int whichButton) {


                    // Canceled.
                    dialog.cancel();


}


}); //End of alert.setNegativeButton            


AlertDialog alertDialog = alert.create();


alertDialog.show();






// Obtain the SupportMapFragment and get notified when the map is ready to be used.


SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()


.findFragmentById(R.id.map);






}






//Initializing googleapi client


googleApiClient = new GoogleApiClient.Builder(this)


.addConnectionCallbacks(this)


.addOnConnectionFailedListener(this)


.addApi(LocationServices.API)


.build();


}






@Override


public void onMapReady(GoogleMap googleMap) {


 //Initializing our map


 mMap = googleMap;


//Creating a random coordinate


LatLng latLng = new LatLng(20.5937,78.9629);


//Adding marker to that coordinate


mMap.addMarker(new MarkerOptions().position(latLng).draggable(true)


.title(strname));


mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));


}






//Getting current location


private void getCurrentLocation() {






//Creating a location object


if (ActivityCompat.checkSelfPermission(this, Manifest.permission.


ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && 


ActivityCompat.checkSelfPermission(this, 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 = LocationServices.FusedLocationApi


.getLastLocation(googleApiClient);


if (location != null) {


 //Getting longitude and latitude


longitude = location.getLongitude();


latitude = location.getLatitude();


//moving the map to location


moveMap();


}


}






//Function to move the map


private void moveMap() {






 //String to display current latitude and longitude


String msg = latitude + ", "+longitude;






//Creating a LatLng Object to store Coordinates


LatLng latLng = new LatLng(latitude, longitude);






//Adding marker to map


mMap.addMarker(new MarkerOptions()


.position(latLng) //setting position


.draggable(true) //Making the marker draggable


.title(strname)); //Adding a title






//Moving the camera


 mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));






//Animating the camera


mMap.animateCamera(CameraUpdateFactory.zoomTo(15));






//Displaying current coordinates in toast


//Toast.makeText(this, msg, Toast.LENGTH_LONG).show();    }


    @Override    protected void onStart() {
        googleApiClient.connect();
        super.onStart();
    }

    @Override    protected void onStop() {
        googleApiClient.disconnect();
        super.onStop();
    }

    @Override    public void onConnected(Bundle bundle) {
        getCurrentLocation();
    }

    @Override    public void onConnectionSuspended(int i) {

    }

    @Override    public void onConnectionFailed(ConnectionResult connectionResult) 


{

    }
}












Output Screenshots
























































































































_____________________________________________________________________


Source code for this application GoogleMaps.zip , for apk googlemaps.apk






                Happy Coding...








    

    

    

    


    

    

    

    

    

    

    

    

    

    


    

    

    

    

    

    


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