arcgis for android 短路径分析查找最短路径

来源：互联网发布：小宋老师单片机编辑：程序博客网时间：2024/05/08 10:28
ArcGIS for Android（10.1.1）只支持在线的网络分析，执行路径分析可以通过RoutingTask类的solve方法来进行，通过给slove方法传递RoutingParameters类型的参数，可以最短路径的查找。而要成功执行路径分析，就必须发布网络分析服务，比较麻烦，下面的代码中使用的服务是arcgisonline.上已经发布的服务。以下代码程序的界面如下：
界面包含两控件：TextView和MapView，在执行路径分析前单击MapView会增加路径分析的停靠点，长按MapView会根据停靠点（至少要两个停靠点）执行查找最短路径的操作，执行成功之后会在TextView中显示相关的路径信息，这时候单击查询的路径，会选中路径片段，相关的信息也会在TextView上显示。单击TextView就会清空所有结果，恢复到原始状态。（代码绝大部分来自API中的Routing这个例子）
[java] view plaincopy
public class NATestActivity extends Activity {  
      
    MapView mMapView ;  
    private TextView tv_label;  
    private SpatialReference mapSR=SpatialReference.create(102100);;  
    private SpatialReference NASR=SpatialReference.create(4326);  
    private GraphicsLayer routeLayer;//查询到的整条路径  
    private GraphicsLayer semLayer;//查询到的路径片段  
    private List<Point> stopPoints;//保存所有的停靠点  
    private Symbol stopSymbol;//停靠点的符号  
     private SimpleLineSymbol hiderSym;//查询到的路径的片段，设置透明将其“隐藏”  
     private SimpleLineSymbol showSym;//当路径片段被选中的时候，显示的符号  
     private int selectID=-1;//被选中的路径片段的ID（-1表示没有变选中）  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        mMapView = (MapView) findViewById(R.id.map);  
          
        tv_label=(TextView) findViewById(R.id.directionsLabel);  
        ArcGISTiledMapServiceLayer atl=new ArcGISTiledMapServiceLayer("http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");  
        mMapView.addLayer(atl);  
        //mapSR=mMapView.getSpatialReference();  
        routeLayer=new GraphicsLayer();  
        semLayer=new GraphicsLayer();  
        stopPoints=new ArrayList<Point>();  
        mMapView.addLayer(routeLayer);  
        mMapView.addLayer(semLayer);  
        stopSymbol=new SimpleMarkerSymbol(Color.RED, 3, SimpleMarkerSymbol.STYLE.CIRCLE);  
        hiderSym=new SimpleLineSymbol(Color.WHITE, 1);  
        //设置成透明，使其处于“隐藏”状态  
        hiderSym.setAlpha(100);  
        showSym=new SimpleLineSymbol(Color.RED, 4);  
        mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {  
              
            public void onStatusChanged(Object arg0, STATUS arg1) {  
                if(arg0==mMapView&&arg1==STATUS.INITIALIZED){  
                    Point p= new Point( -122.084095,37.422006);  
                    mMapView.zoomToResolution((Point) GeometryEngine.project(p, NASR, mapSR), 20.0);  
                    Log.i("OK", "KKK");  
                    //单击地图添加要经过的位置  
                    mMapView.setOnSingleTapListener(new MyOnSintTapLis());  
                    //长按开始执行路径分析  
                    mMapView.setOnLongPressListener(new MyOnPressLis());  
                    //设置tv_label的单击事件为，清楚所以选中的和查询的结果  
                    tv_label.setOnClickListener(new OnClickListener() {  
                        public void onClick(View v) {  
                            semLayer.removeAll();  
                            routeLayer.removeAll();  
                            selectID=-1;  
                            tv_label.setText("");  
                        }  
                    });  
                }  
            }  
        });  
  
    }  
      
    /** 
     * 单击地图事件，先判断是semLayer里面是否为空， 
     * 如果为空就增加停靠点，如果不为空则进行选择semLayer中的内容操作 
     */  
    class MyOnSintTapLis implements OnSingleTapListener{  
        public void onSingleTap(float arg0, float arg1) {  
              
            if(semLayer.getNumberOfGraphics()==0){//增加停靠点  
                Point mapPoint=mMapView.toMapPoint(arg0, arg1);  
                routeLayer.addGraphic(new Graphic(mapPoint, stopSymbol));  
                stopPoints.add((Point)GeometryEngine.project(mapPoint, mapSR, NASR));  
            }else{//选中路径片段  
                int[] ids= semLayer.getGraphicIDs(arg0, arg1, 20);  
                if(ids.length>0){//有路径片段被选中  
                    //回复已经被选中的路径片段为透明  
                    semLayer.updateGraphic(selectID,hiderSym);  
                    //设置新的被选中的路径片段为被选中状态  
                    selectID=ids[0];  
                    semLayer.updateGraphic(selectID,showSym);  
                    //取得被选中的路径片段和其属性  
                    Graphic selectGraphic=semLayer.getGraphic(selectID);  
                    String text=(String) selectGraphic.getAttributeValue("text");  
                    double time=(Double) selectGraphic.getAttributeValue("time");  
                    double length=(Double) selectGraphic.getAttributeValue("length");  
                    tv_label.setText("长度："+length+"米,  时间："+time+"分钟,描述："+text);  
                    //缩放到被选中的片段  
                    mMapView.setExtent(selectGraphic.getGeometry(),100);  
                }  
            }  
        }  
          
    }  
    //长按地图事件  
    class MyOnPressLis implements OnLongPressListener{  
        public void onLongPress(float arg0, float arg1) {  
        if(stopPoints.size()<2){  
            Toast.makeText(getApplicationContext(), "必须至少选择两个停靠点", 0).show();  
            return;  
        }  
        Toast.makeText(getApplicationContext(), "开始查找最短路径", 1).show();  
            new Thread(){//网络分析不能再主线程中进行  
                public void run() {  
                    //准备参数  
                    RoutingParameters rp=new RoutingParameters();  
                    NAFeaturesAsFeature naferture=new NAFeaturesAsFeature();  
                    //设置查询停靠点，至少要两个  
                    for(Point p :stopPoints){  
                        StopGraphic sg=new StopGraphic(p);  
                        naferture.addFeature(sg);  
                    }  
                    rp.setStops(naferture);  
                    //设置查询输入的坐标系跟底图一样  
                    rp.setOutSpatialReference(mapSR);  
                      RoutingTask rt = new RoutingTask(   
                              "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Network/USA/NAServer/Route",  
                              null);  
                      try {  
                          //执行操作  
                        RoutingResult rr=rt.solve(rp);  
                        runOnUiThread(new MyRun(rr));  
                    } catch (Exception e) {  
                        e.printStackTrace();  
                        Looper.prepare();  
                        Toast.makeText(getApplicationContext(), e.getMessage(), 1).show();  
                        Looper.loop();  
                    }  
                  
                }  
            }.start();  
        }  
          
    }  
      
    class MyRun implements Runnable{  
        private RoutingResult rr;  
        public MyRun(RoutingResult rr) {  
            this.rr=rr;  
        }  
        public void run() {  
                stopPoints.clear();  
                //得到查询到的路径  
                Route r=rr.getRoutes().get(0);  
                //往tv_label中赋值  
                tv_label.setText("中长度："+r.getTotalLength()+"米,  总时间："+r.getTotalTime()+"分钟,描述："+r.getRouteName());  
                //将这条查询到路径放入routeLayer中  
                Graphic routeGraphic=new Graphic(r.getRoute().getGeometry(),new SimpleLineSymbol(Color.BLUE, 3));  
                routeLayer.addGraphic(routeGraphic);  
                mMapView.setExtent(routeGraphic.getGeometry(),100);  
                List<RoutingDirection>  routeDirs=rr.getRoutes().get(0).getRoutingDirections();  
                  
                //取得查询到的路径片段，和其属性，放入到semLayer中，供点击查询每个片断信息  
                Map<String ,Object> atts=new HashMap<String,Object>();  
                for(RoutingDirection routeDir: routeDirs){  
                atts.put("text", routeDir.getText());  
                atts.put("length", routeDir.getLength());  
                atts.put("time", routeDir.getTime());  
                Graphic dirGraphic=new Graphic(routeDir.getGeometry(), hiderSym, atts, null);  
                semLayer.addGraphic(dirGraphic);      
            }  
        }  
          
    }  
  
    @Override   
    protected void onDestroy() {   
        super.onDestroy();  
 }  
    @Override  
    protected void onPause() {  
        super.onPause();  
        mMapView.pause();  
 }  
    @Override   protected void onResume() {  
        super.onResume();   
        mMapView.unpause();  
    }  
  
}  
结果：
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arcgis for android 短路径分析 查找最短路径

arcgis for android 短路径分析查找最短路径
