How to select graphic on click

sepans — Sat, 11 Dec 2021 06:04:52 GMT

I'm using the arcGIS Android API with Android Studio, and I would like to know how to select a graphic symbol when a user taps on it. I have a graphics layer and I've added a couple picture marker symbols to it. I simply want to show a symbol as being selected when a user taps on it.

Creating the graphics:

graphicAirport_IAD = new Graphic(projIAD, pmsAirport); 
graphicAirport_DCA = new Graphic(projDCA, pmsAirport); 
graphicAirport_BWI = new Graphic(projBWI, pmsAirport);

Adding the graphics to map view:

mMapView.addLayer(gAirport); 
gAirport.addGraphic(graphicAirport_IAD); 
gAirport.addGraphic(graphicAirport_DCA); 
gAirport.addGraphic(graphicAirport_BWI);

The graphics all show up fine. Again, I would just like to be able to select them when they're tapped on (respectively) by a user.

Thanks!

Re: How to select graphic on click

AlexanderNohe1 — Sat, 11 Dec 2021 06:04:55 GMT

I wrote something like this:

public class MainActivity extends AppCompatActivity {

  MapView mMapView;
   GraphicsLayer mGraphicsLayer;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   mMapView = (MapView) findViewById(R.id.map_view);
   mMapView.setOnSingleTapListener(new OnSingleTapListener() {
   @Override
   public void onSingleTap(float v, float v1) {
  Point point = mMapView.toMapPoint(v, v1);
  int[] graphicIDs = mGraphicsLayer.getGraphicIDs(v, v1, 1, 1);
  for (int i = 0; i < graphicIDs.length; i++) {
  Log.d("NOHE", "GRAPHIC: " + graphicIDs);
   }
   mGraphicsLayer.setSelectedGraphics(graphicIDs, true);
   }
  });

   mGraphicsLayer = new GraphicsLayer(mMapView.getSpatialReference(), mMapView.getMaxExtent(), GraphicsLayer.RenderingMode.DYNAMIC);
   mGraphicsLayer.addGraphic(new Graphic(new Point(-8416452.130, 4628356.957), new PictureMarkerSymbol(ContextCompat.getDrawable(getApplicationContext(), R.drawable.ic_marker))));
   mGraphicsLayer.setSelectionColorWidth(3);
   mGraphicsLayer.setSelectionColor(R.color.selectionColor);
   mMapView.addLayer(mGraphicsLayer);
   }
}

More logic is required for you to get it working exactly the way you want. The important portion here is the onSingleTap listener. You could modify this code to remove and add selections.

topic Re: How to select graphic on click in ArcGIS Runtime SDK for Android Questions

How to select graphic on click

Re: How to select graphic on click