Android GIS开发系列-- 入门季（3） GraphicsLayer添加点、线、面
GraphicsLayer是图形图层，可以自定义图形添加到地图上。调用GraphicsLayer的addGraphic方法就能添加图形，此方法要一个Graphic对象，此对象的构造方法是Graphic(Geometrygeometry,Symbolsymbol)，前面第一个是要素，而Geometry的子类有Envelope,MultiPath,MultiPoint,Point,Segment，Line,Polygon,Polyline。我们所常用的有点Point，线Polyline，面Polygon。而后面一 个参数是样式，点的样式是SimpleMarkerSymbol，线的样式是SimpleLineSymbol，面的样式是SimpleFillSymbol。 一、GraphicsLayer添加点： Graphicgraphic=newGraphic(point,newSimpleMarkerSymbol(Color.RED,5,SimpleMarkerSymbol.STYLE.CIRCLE)); graphicsLayer.addGraphic(graphic); 二、添加线，样式有实线、虚线、点虚线、点点虚线、点线等。效果图如下： Polylinepolyline=newPolyline(); polyline.startPath(newPoint(113,23));//第一个点用startPath,后面的点用lineTo方法 polyline.lineTo(newPoint(123,23)); graphic=newGraphic(polyline,newSimpleLineSymbol(Color.RED,3,SimpleLineSymbol.STYLE.SOLID)); graphicsLayer.addGraphic(graphic); 三、添加面Polygon，效果图如下： Polygonpolygon=newPolygon(); //第一个点startPath,后面的点用lineTo polygon.startPath(newPoint(118,23)); polygon.lineTo(newPoint(118,15)); polygon.lineTo(newPoint(113,13)); graphic=newGraphic(polygon,newSimpleFillSymbol(Color.GREEN,SimpleFillSymbol.STYLE.SOLID)); graphicsLayer.addGraphic(graphic); Code for all: packagecom.arcgis.test; importandroid.graphics.Color; importandroid.os.Bundle; importandroid.support.annotation.Nullable; importandroid.support.v7.app.AppCompatActivity; importandroid.view.View; importandroid.widget.AdapterView; importandroid.widget.Button; importandroid.widget.Spinner; importcom.esri.android.map.GraphicsLayer; importcom.esri.android.map.MapView; importcom.esri.android.map.ags.ArcGISTiledMapServiceLayer; importcom.esri.android.map.event.OnSingleTapListener; importcom.esri.core.geometry.Point; importcom.esri.core.geometry.Polygon; importcom.esri.core.geometry.Polyline; importcom.esri.core.map.Graphic; importcom.esri.core.symbol.SimpleFillSymbol; importcom.esri.core.symbol.SimpleLineSymbol; importcom.esri.core.symbol.SimpleMarkerSymbol; importjava.util.ArrayList; importjava.util.List; publicclassGraphicActivityextendsAppCompatActivity{ privateMapViewmMapView; privateSpinnergraphicTypeSpinner; privateButtonclernBtn; privateArcGISTiledMapServiceLayerarcGISTiledMapServiceLayer; privateGraphicsLayergraphicsLayer; privateStringmapServerUrl="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"; //点集合 privateList<Point>pointList=newArrayList<>(); privateGraphicgraphic; @Override protectedvoidonCreate(@NullableBundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_graphic); initView(); addLayer(); } privatevoidinitView(){ mMapView=(MapView)findViewById(R.id.map_view); //mapview点击事件 mMapView.setOnSingleTapListener(newOnSingleTapListener(){ @Override publicvoidonSingleTap(floatx,floaty){ handleSingleTap(x,y); } }); graphicTypeSpinner=(Spinner)findViewById(R.id.spinner_type); graphicTypeSpinner.setOnItemSelectedListener(newAdapterView.OnItemSelectedListener(){ @Override publicvoidonItemSelected(AdapterView<?>parent,Viewview,intposition,longid){ pointList.removeAll(pointList); graphicsLayer.removeAll(); } @Override publicvoidonNothingSelected(AdapterView<?>parent){ } }); clernBtn=(Button)findViewById(R.id.clear_graphic); clernBtn.setOnClickListener(newView.OnClickListener(){ @Override publicvoidonClick(Viewv){ pointList.removeAll(pointList); graphicsLayer.removeAll(); } }); } privatevoidaddLayer(){ arcGISTiledMapServiceLayer=newArcGISTiledMapServiceLayer(mapServerUrl); mMapView.addLayer(arcGISTiledMapServiceLayer); graphicsLayer=newGraphicsLayer(); mMapView.addLayer(graphicsLayer); } privatevoidhandleSingleTap(floatx,floaty){ Pointpoint=mMapView.toMapPoint(x,y); graphicsLayer.removeAll(); pointList.add(point); Stringtype=graphicTypeSpinner.getSelectedItem().toString().trim(); switch(type){ case"点": graphic=newGraphic(point,newSimpleMarkerSymbol(Color.RED,5,SimpleMarkerSymbol.STYLE.CIRCLE)); graphicsLayer.addGraphic(graphic); break; case"线": Polylinepolyline=newPolyline(); if(pointList.size()>1){ for(inti=0;i<pointList.size();i++){ if(i==0){ polyline.startPath(pointList.get(i)); }else{ polyline.lineTo(pointList.get(i)); } } } graphic=newGraphic(polyline,newSimpleLineSymbol(Color.RED,3,SimpleLineSymbol.STYLE.SOLID)); graphicsLayer.addGraphic(graphic); break; case"面": Polygonpolygon=newPolygon(); for(inti=0;i<pointList.size();i++){ if(i==0){ polygon.startPath(pointList.get(i)); }else{ polygon.lineTo(pointList.get(i)); } } graphic=newGraphic(polygon,newSimpleFillSymbol(Color.GREEN,SimpleFillSymbol.STYLE.SOLID)); graphicsLayer.addGraphic(graphic); break; } } } 没有整理与归纳的知识，一文不值！高度概括与梳理的知识，才是自己真正的知识与技能。 永远不要让自己的自由、好奇、充满创造力的想法被现实的框架所束缚，让创造力自由成长吧！ 多花时间，关心他（她）人，正如别人所关心你的。理想的腾飞与实现，没有别人的支持与帮助，是万万不能的。 本文转自wenglabs博客园博客，原文链接：http://www.cnblogs.com/arxive/p/7751859.html ，如需转载请自行联系原作者
