public class MapsActivity extends AppCompatActivity {

    private MapView mapView;

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

        mapView = findViewById(R.id.mapView);
        mapView.getMapboxMap().loadStyleUri(Style.MAPBOX_STREETS);
    }
}