android - Draw Circle in ImageView when getting current location IndoorAtlas SDK -

i want current location , draw blue dot picture above. blue dot moving when current location change.

here code :

public void onserviceupdate(servicestate state) {     msharedbuilder.setlength(0);     msharedbuilder.append("location: ")             .append(state.getroundtrip()).append("ms")             .append(state.getgeopoint().getlatitude())             .append(state.getgeopoint().getlongitude())             .append(state.getmetricpoint().getx())             .append(state.getmetricpoint().gety())             .append(state.getimagepoint().geti())             .append(state.getimagepoint().getj())             .append(state.getheadingdegrees())             .append(state.getuncertainty());     double x1 = state.getmetricpoint().getx();     double y1 = state.getmetricpoint().gety();     float x = (float) x1;     float y = (float) y1;     paint paint = null;     canvas.drawcircle(x,y,1,paint); } 

could me ? pictures in resource folder.

first, in case easier if use coordinates servicestate#getimagepoint() - these (i & j) coordinates of location in original floor plan. i.e. if original mapped & uploaded floor plan had dimensions 800x600, service might return position i:400,j:300 indicating in center of mapped area.

you cannot draw circle this: canvas.drawcircle(400, 300, radius, paint) - because depending on how image displayed (e.g. scaled) might drawing incorrect location.

you need take account image on screen , it's current dimensions, i.e. scaling ratio. e.g. if have display of size 1920x1080 , floor plan image of size 800x600 drawn centered , without scaling imageview occupies entire screen real estate (assume full 1920x1080 in portrait here), need draw current coordinate (400,300) canvas @ x: ((1080-800)/2)+400, y: ((1920-600/2)+300) = 540,960.

to draw accuracy blue dot (the semi-transparent larger circle), use uncertainty calculate circle radius.