android how to draw a circle on google map

Hi Developer in these Android article we are implementing  google Map accuracy circle around marker. So in these Android blog we are learn How To Draw A Circle Around Marker on Google Map in Android.

Android how to draw a circle on google map

First of you can Start you Android studio and make a project and Select a Google map Activity. To draw circle around a pin using Google MAps API v2

Secondly create a google map key for developer console and show your google map and if you have already make these you can just follow these code.

Step : 1 Create a Activity with Select Map Activity. 

In you Map activity you can Add a circle method for drawing a circle on marker. and user google map CircleOption for Drow circle.

CircleOptions circleOptions = new CircleOptions();

Used These method to draw a circle Around the marker and Pass the latLong on these method.

private void drawCircle(LatLng point){

    // Instantiating CircleOptions to draw a circle around the marker
    CircleOptions circleOptions = new CircleOptions();
    // Specifying the center of the circle
    circleOptions.center(point);
    // Radius of the circle
    circleOptions.radius(100);
    // Border color of the circle
    circleOptions.strokeColor(Color.BLACK);
    // Fill color of the circle
    circleOptions.fillColor(0x30ff0000);
    // Border width of the circle
    circleOptions.strokeWidth(2);
    // Adding the circle to the GoogleMap
    mMap.addCircle(circleOptions);

}

Map Activity Full source 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);
        // 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));
        float zoomLevel = 16.0f; //This goes up to 21
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, zoomLevel));
//        Circle circle = mMap.addCircle(new CircleOptions()
//                .center(new LatLng(-34, 151))
//                .radius(10000)
//                .strokeColor(Color.RED)
//                .fillColor(Color.rgb(135,206,235)));

        drawCircle(new LatLng(-34, 151));
    }

    private void drawCircle(LatLng point){

        // Instantiating CircleOptions to draw a circle around the marker
        CircleOptions circleOptions = new CircleOptions();
        // Specifying the center of the circle
        circleOptions.center(point);
        // Radius of the circle
        circleOptions.radius(100);
        // Border color of the circle
        circleOptions.strokeColor(Color.BLACK);
        // Fill color of the circle
        circleOptions.fillColor(0x30ff0000);
        // Border width of the circle
        circleOptions.strokeWidth(2);
        // Adding the circle to the GoogleMap
        mMap.addCircle(circleOptions);

    }
}

 

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