//create a simple marker symbol
SimpleMarkerSymbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.RED, 12); //size 12, style of circle
//add a new graphic with a new point geometry
Point graphicPoint = new Point(-226773, 6550477, SpatialReferences.getWebMercator());
Graphic graphic = new Graphic(graphicPoint, symbol);
graphicsOverlay.getGraphics().add(graphic);
//define a polyline for the boat trip
Polyline boatRoute = getBoatTripGeometry();
//define a line symbol
SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DASH, Color.rgb(128, 0, 128), 4);
//create the graphic
Graphic boatTripGraphic = new Graphic(boatRoute, lineSymbol);
//add to the graphic overlay
graphicOverlay.getGraphics().add(boatTripGraphic);
Arcgis Runtime for andriod 100 Simple marker symbol
原文：http://www.cnblogs.com/gisoracle/p/7413952.html