InstantPlacementPoint

class ArPlacementActivity {
   private Session session = null;
   private placementIsDone = false;
   public void createSession() {
     session = new Session(this);
     Config config = new Config(session);
     config.setInstantPlacementMode(InstantPlacementMode.LOCAL_Y_UP);
     session.configure(config);
   }
   public void onDrawFrame(GL10 gl) {
     Frame frame = session.update();
     // Place an object on tap.
     if (!placementIsDone && didUserTap()) {
       // Use estimated distance from the user's device to the real world, based
       // on how we expect the app to be used by users.
       float approximateDistanceMeters = 1.0f;
       List<HitResult> results =
          frame.hitTestInstantPlacement(tapX, tapY, approximateDistanceMeters);
       if (!results.isEmpty()) {
         HitResult hit = results.get(0);
         InstantPlacementPoint point = (InstantPlacementPoint) hit.getTrackable();
         anchor = point.createAnchor(point.getPose());
         placementIsDone = true;
         disableInstantPlacement();
       }
     }
   }
   private void disableInstantPlacement() {
     // When the placement is done, you can disable Instant Placement to save computing.
     Config config = new Config(session);
     config.setInstantPlacementMode(InstantPlacementMode.DISABLED);
     session.configure(config);
   }
 }

class WrappedInstantPlacement {
   public InstantPlacementPoint point;
   public TrackingMethod previousTrackingMethod;
   public float previousDistanceToCamera;
   public float scaleFactor = 1.0f;
   public WrappedInstantPlacement(
       InstantPlacementPoint point,
       TrackingMethod previousTrackingMethod,
       float previousDistanceToCamera) {
     this.point = point;
     this.previousTrackingMethod = previousTrackingMethod;
     this.previousDistanceToCamera = previousDistanceToCamera;
   }
 }
 ArrayList<WrappedInstantPlacement> wrappedPoints =
     new ArrayList<WrappedInstantPlacement>();
 public void onDrawFrame(GL10 gl) {
   Frame frame = session.update();
   // Place an object on tap.
   if (didUserTap()) {
     // Use estimated distance from the user's device to the real world, based
     // on how we expect the app to be used by users.
     float approximateDistanceMeters = 2.0f;
     // Returns a single result if the hit test was successful.
     List<HitResult> results = frame.hitTestInstantPlacement(tapX, tapY,
         approximateDistanceMeters);
      for (HitResult hit : results) {
        InstantPlacementPoint point = (InstantPlacementPoint) hit.getTrackable();
        wrappedPoints.add(
            new WrappedInstantPlacement(point, point.getTrackingMethod(),
                                        distance(camera.getPose(), point.getPose())));
      }
   }
   for (WrappedInstantPlacement wrappedPoint : wrappedPoints) {
     InstantPlacementPoint point = wrappedPoint.point;
     if (point.getTrackingState() == TrackingState.STOPPED) {
       wrappedPoints.remove(wrappedPoint);
       continue;
     }
     if (point.getTrackingState() == TrackingState.PAUSED) {
       continue;
     }
     if (point.getTrackingMethod() == TrackingMethod.SCREENSPACE_WITH_APPROXIMATE_DISTANCE) {
       // Continue to use estimated depth and pose. Record distance to camera for use in
       // the next frame if the transition to full tracking happens.
       wrappedPoint.previousDistanceToCamera =
           distance(point.getPose(), camera.getPose());
     } else if (point.getTrackingMethod() == TrackingMethod.FULL_TRACKING) {
       if (wrappedPoint.previousPoseType ==
           TrackingMethod.SCREENSPACE_WITH_APPROXIMATE_DISTANCE) {
        // Transition from estimated pose to real pose. Adjust object scale to
        // counter-act apparent change is size due to pose jump.
        wrappedPoint.scaleFactor = distance(point.getPose(), camera.getPose()) /
            wrappedPoint.previousDistanceToCamera);
        // TODO: Apply the scale factor to the model.
        // ...
        previousPoseType = TrackingMethod.FULL_TRACKING;
       }
     }
   }
 }