Android Google Maps onMapReady stores GoogleMap

Question

I have an Android application in development that uses this google maps api v2. To get a google map instance using the onMapReady callback . In this callback, I get a google map instance, can I save this instace resource to reuse it without getting a new one every time I need to update the map? Or is there a problem with reusing this instance over time? I just want to make sure that there is nothing with which I could get into a problem.

Thank you for your responses!

Answer 1

, Google Map , getMap() getMapAsync().

getMapAsync() onResume(), , , onPause().

. , , , , . , startActivityForResult() .

:

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private Marker marker;
    private Button button;

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

        button = (Button) findViewById(R.id.testButton);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MapsActivity.this, TestActivity.class);
                startActivityForResult(i, 100);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == 100) {
            Log.d("MyMap", "onActivityResult " + data.getStringExtra("result"));
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        Log.d("MyMap", "onPause");
    }

    @Override
    protected void onResume() {
        super.onResume();

        Log.d("MyMap", "onResume");
        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {

        if (mMap == null) {

            Log.d("MyMap", "setUpMapIfNeeded");
            ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                    .getMapAsync(this);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        Log.d("MyMap", "onMapReady");
        mMap = googleMap;
        setUpMap();
    }

    private void setUpMap() {

        mMap.setMyLocationEnabled(true);
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        mMap.getUiSettings().setMapToolbarEnabled(false);


        mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {

            @Override
            public void onMapClick(LatLng point) {

                Log.d("MyMap", "MapClick");

                //remove previously placed Marker
                if (marker != null) {
                    marker.remove();
                }

                //place marker where user just clicked
                marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
                        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));

                Log.d("MyMap", "MapClick After Add Marker");

            }
        });

    }
}

, , , , , "", , .

, onPause() , onResume(), getMapAsync(). , , , .

 D/MyMap﹕ onResume
 D/MyMap﹕ setUpMapIfNeeded
 D/MyMap﹕ onMapReady
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ onPause
 D/MyMap﹕ onActivityResult ok
 D/MyMap﹕ onResume
 D/MyMap﹕ setUpMapIfNeeded
 D/MyMap﹕ onMapReady
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker
 D/MyMap﹕ MapClick
 D/MyMap﹕ MapClick After Add Marker