最近在项目中遇到这么一个情况，在MapView中要求实现绘制点、线、面。
在这里面就会遇到这么一个问题，绘制折线和多边形型时，每点击一个点屏幕就会跟着晃，使用起来很不方便（使用Note2 触控笔），所以有没有一种方法让我点击绘制界面开始，地图界面锁死，在绘制结束时ontouch事件才响应。
现在先说说思路，一般来说我设置MapView的OnTouch事件为Null，屏幕就不会跟着动了，但是同时OnTouch事件也没法使用了，这个方法不可用。但是流状线和流状面绘制是怎么实现的呢？经过查询，在OnTouch的中有以下两个方法：
public boolean onDragPointerMove(MotionEvent from, MotionEvent to)
public boolean onDragPointerUp(MotionEvent from, MotionEvent to)
这两个方法分别对应了按下时的滑动事件和滑动松开事件，我们让这两个方法在绘制折线和自定义面时返回false，屏幕就不会跟着跑了 。
MapOnTouchListener类如下：
public class MyTouchListener extends MapOnTouchListener { MultiPath polyline,polygon,line,freepolygon; DrawType type = DrawType.None; Point startPoint = null; MapView map = null; DrawWidget drawwidget =null; private View calloutView =null; int graphicFreelineId = 0; int graphicLineId = 0; int graphicFreePloygOnId= 0; int graphicPloygOnId= 0; public MyTouchListener(Context context, MapView view,DrawWidget d,View v) { super(context, view); map = view; drawwidget=d; calloutView = v; } public void setType(DrawType type) { this.type = type; } public DrawType getType() { return this.type; } @Override public boolean onSingleTap(MotionEvent e) { if(type == DrawType.Point) { Geometry geo = map.toMapPoint(new Point(e.getX(), e.getY())); Graphic gra = addGeometryToLocalDB(geo); if(gra!=null){ GraUID =mGraphicsLayer.addGraphic(gra);//添加要素至数据库 //弹出callout窗口 Point coordinate=(Point) geo; drawwidget.showCallout(coordinate, calloutView); mMyTouchListener.setType(DrawType.None); } return true; }else if(type == DrawType.Line){ //获取屏幕点击坐标点 Point point = map.toMapPoint(new Point(e.getX(), e.getY())); if (startPoint == null) { startPoint = point; line = new Polyline(); line.startPath(point); //添加节点信息 Graphic graphic = new Graphic(point,new SimpleMarkerSymbol(Color.BLACK,5,STYLE.CIRCLE)); tmpLayer.addGraphic(graphic); //添加线要素 Graphic graphic_line = new Graphic(line,FeatureSymbol.lineSymbol_new); graphicLineId = mGraphicsLayer.addGraphic(graphic_line); } else{ //添加线要素节点 Graphic graphic_t = new Graphic(point,new SimpleMarkerSymbol(Color.BLACK,5,STYLE.CIRCLE)); tmpLayer.addGraphic(graphic_t); //更新线信息 line.lineTo(point); mGraphicsLayer.updateGraphic(graphicLineId, line); } }else if(type == DrawType.Polygon){ //获取屏幕点击坐标点 Point point = map.toMapPoint(new Point(e.getX(), e.getY())); if (startPoint == null) { startPoint = point; polygon = new Polygon(); polygon.startPath(point); //添加节点信息 Graphic graphic = new Graphic(point,new SimpleMarkerSymbol(Color.BLACK,5,STYLE.CIRCLE)); tmpLayer.addGraphic(graphic); //添加多边形要素 Graphic graphic_polygon = new Graphic(polygon,FeatureSymbol.polygonSymbol_new); graphicPloygonId = mGraphicsLayer.addGraphic(graphic_polygon); } else{ //添加要素节点 Graphic graphic_t = new Graphic(point,new SimpleMarkerSymbol(Color.BLACK,5,STYLE.CIRCLE)); tmpLayer.addGraphic(graphic_t); //更新多边形信息 polygon.lineTo(point); mGraphicsLayer.updateGraphic(graphicPloygonId, polygon); } } return false; } @Override public boolean onDoubleTap(MotionEvent event) { tmpLayer.removeAll(); if (type == DrawType.Line) { if(line!=null){ Graphic gral = addGeometryToLocalDB(line);//添加要素至数据库 if(gral!=null){ mGraphicsLayer.updateGraphic(graphicLineId,gral); drawwidget.showCallout(startPoint, calloutView); }else{ mGraphicsLayer.removeGraphic(graphicLineId); } }else{ Toast.makeText(DrawWidget.super.context,"未添加任务要素！",Toast.LENGTH_SHORT).show(); } GraUID =graphicLineId; startPoint = null; line = null; mMyTouchListener.setType(DrawType.None); DrawWidget.super.showMessageBox("折线绘制结束！"); return true; }else if(type == DrawType.Polygon){ if(polygon!=null){ Graphic gra = addGeometryToLocalDB(polygon); if(gra!=null){ mGraphicsLayer.updateGraphic(graphicPloygonId,gra ); //添加要素至数据库 //弹出callout窗口 drawwidget.showCallout(startPoint, calloutView); }else{ mGraphicsLayer.removeGraphic(graphicPloygonId); } }else{ Toast.makeText(DrawWidget.super.context,"未添加任务要素！",Toast.LENGTH_SHORT).show(); } GraUID =graphicPloygonId; startPoint = null; polygon = null; mMyTouchListener.setType(DrawType.None); DrawWidget.super.showMessageBox("多边形绘制结束！"); return true; } return super.onDoubleTap(event); } //@Override public boolean onDragPointerMove(MotionEvent from, MotionEvent to) { Point mapPt = map.toMapPoint(to.getX(), to.getY()); if (type == DrawType.Freeline) { if (startPoint == null) { polyline = new Polyline(); startPoint = map.toMapPoint(from.getX(), from.getY()); polyline.startPath((float) startPoint.getX(), (float) startPoint.getY()); graphicFreelineId = mGraphicsLayer.addGraphic(new Graphic(polyline,FeatureSymbol.lineSymbol_new)); } polyline.lineTo((float) mapPt.getX(), (float) mapPt.getY()); mGraphicsLayer.updateGraphic(graphicFreelineId,new Graphic(polyline,FeatureSymbol.lineSymbol_new)); return true; } else if (type == DrawType.FreePolygon) { //polygonSymbol.setAlpha(80); if (startPoint == null) { freepolygon = new Polygon(); startPoint = map.toMapPoint(from.getX(), from.getY()); freepolygon.startPath((float) startPoint.getX(), (float) startPoint.getY()); graphicFreePloygonId = mGraphicsLayer.addGraphic(new Graphic(freepolygon,FeatureSymbol.polygonSymbol_new)); } freepolygon.lineTo((float) mapPt.getX(), (float) mapPt.getY()); mGraphicsLayer.updateGraphic(graphicFreePloygonId, new Graphic(freepolygon,FeatureSymbol.polygonSymbol_new)); return true; }else if(type == DrawType.Polygon||type == DrawType.Line){ return false;//返回false，使屏幕不滑动固定死(两个位置) } return super.onDragPointerMove(from, to); } @Override public boolean onDragPointerUp(MotionEvent from, MotionEvent to) { if(type == DrawType.Line ||type == DrawType.Polygon){ return false;//返回false，使屏幕不滑动固定死(两个位置) }else if(type ==DrawType.Freeline ){ Graphic gral = addGeometryToLocalDB(polyline);//添加要素至数据库 if(gral!=null){ mGraphicsLayer.updateGraphic(graphicFreelineId,gral); drawwidget.showCallout(startPoint, calloutView); }else{ mGraphicsLayer.removeGraphic(graphicFreelineId); } GraUID = graphicFreelineId; startPoint = null; polyline = null;//流状线 DrawWidget.super.mapView.setOnTouchListener(mDefaultMyTouchListener); }else if(type == DrawType.FreePolygon){ Graphic gra = addGeometryToLocalDB(freepolygon); if(gra!=null){ mGraphicsLayer.updateGraphic(graphicFreePloygonId,gra);//添加要素至数据库 drawwidget.showCallout(startPoint, calloutView); }else{ mGraphicsLayer.removeGraphic(graphicFreePloygonId); } GraUID = graphicFreePloygonId; startPoint = null; freepolygon = null;//流状面 DrawWidget.super.mapView.setOnTouchListener(mDefaultMyTouchListener); } return super.onDragPointerUp(from, to); }
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