arcgis for android 实现绘图功能

一：实现绘图功能的思路

1：首先需要一个点击地图的一个监听函数，可以实现点击地图画点、线、面。arcgis提供一个mapontouchlistener类。

2：创建点、线、面对象，arcgis提供的类有point，polygon，line

3：设置样式，不管是点、线、面都有自己的样式。arcgis提供了simplelinesymbol （线样式类）simplemarkersymbol（点样式类）simplefillsymbol（面样式类）

4：创建一个绘画的图层，graphicslayer

5：将绘画图层添加到地图上。

二:实现代码

1：创建一个类继承mapontouchlistener用来监听地图的点击

public class maptouchlistener extends mapontouchlistener {
/**
	 * 单击地图
	 */
	public boolean onsingletap(motionevent point) {
}
}

2：创建点、线、面对象

//屏幕坐标转化成空间坐标
point mappoint = map.tomappoint(point.getx(),point.gety());

3：创建样式

	//设置点、线、面的样式
    private void initsymbols(){
    	markersymbol = new simplemarkersymbol(color.blue,10,style.circle);
    	linesymbol =  new simplelinesymbol(color.black, 1, simplelinesymbol.style.solid);
    	fillsymbol = new simplefillsymbol(color.black, simplefillsymbol.style.solid);
    	fillsymbol.setalpha(33);//设置的透明度
    } 

4：创建一个绘画图层

	   //创建绘图图层 对象
	   drawlayer = new graphicslayer();
	   mmapview.addlayer(drawlayer);

5：添加到地图上(这一定要加上，否则地图的监听事件无法实现)

  //绑定触摸事件监听器
	  maptouchlistener=new maptouchlistener(earthquakeactivity.this,mmapview);
	  maptouchlistener.setlayer(drawlayer);
      mmapview.setontouchlistener(maptouchlistener);

6：完成代码

package cn.zzu.graphic;

import java.text.decimalformat;
import java.util.arraylist;

import android.content.context;
import android.graphics.color;
import android.view.motionevent;
import android.widget.toast;

import cn.zzu.global.variable;
import cn.zzu.query.myidentifytask;

import com.esri.android.map.graphicslayer;
import com.esri.android.map.mapontouchlistener;
import com.esri.android.map.mapview;
import com.esri.core.geometry.envelope;
import com.esri.core.geometry.geometry;
import com.esri.core.geometry.geometry.type;
import com.esri.core.geometry.geometryengine;
import com.esri.core.geometry.line;
import com.esri.core.geometry.multipath;
import com.esri.core.geometry.point;
import com.esri.core.geometry.polygon;
import com.esri.core.geometry.polyline;
import com.esri.core.geometry.spatialreference;
import com.esri.core.map.graphic;
import com.esri.core.symbol.simplefillsymbol;
import com.esri.core.symbol.simplelinesymbol;
import com.esri.core.symbol.simplemarkersymbol;
import com.esri.core.symbol.simplemarkersymbol.style;
import com.esri.core.tasks.identify.identifyparameters;

public class maptouchlistener extends mapontouchlistener {
	private context context;//上下文
	private mapview map;//地图对象
	private graphicslayer graphicslayer;//画图图层
	private geometry.type geotype = null;//绘图的对象
	private point endponit = null;
	private polygon polygon;
	private polygon webpolygon;
	private simplelinesymbol linesymbol;  
	private simplemarkersymbol markersymbol;  
	private simplefillsymbol fillsymbol;
	private arraylist points=null;//记录全部点
	private identifyparameters params;
	public maptouchlistener(context context, mapview map) {		
		super(context, map);
		this.context = context;
		this.map = map;
		//样式初始化
		initsymbols();
	}
	
	// 根据用户选择设置当前绘制的几何图形类型
	public void setdrawtype(geometry.type geotype)
	{
		this.geotype=geotype;
		//将上一次绘图的图形删除
		graphicslayer.removeall();
		endponit = null;
		if(geotype == geometry.type.polygon)
			points=new arraylist();
	}
	/**
	 * 判断是否量测
	 * @param measure
	 */
	public void setmeasure(boolean measure){
		if(geotype == geometry.type.polyline)
			variable.measurelength = measure;
		if(geotype == geometry.type.polygon)
			variable.measurearea = measure;
	}
	/**
	 * 
	 * 创建画图图层
	 * @param drawlayer
	 */
	public void setlayer(graphicslayer drawlayer){
		this.graphicslayer=drawlayer;
	}
	//设置点、线、面的样式
    private void initsymbols(){
    	markersymbol = new simplemarkersymbol(color.blue,10,style.circle);
    	linesymbol =  new simplelinesymbol(color.black, 1, simplelinesymbol.style.solid);
    	fillsymbol = new simplefillsymbol(color.black, simplefillsymbol.style.solid);
    	fillsymbol.setalpha(33);//设置的透明度
    } 
    
    public void setqueryparams(){
    	//实例化对象，并且给实现初始化相应的值
    	params = new identifyparameters();//创建查询的对象
    	params.settolerance(20);//设置识别的容差
    	params.setdpi(98);//设置自分辨率
    	params.setlayers(new int[]{0,1,2,3,6});//设置识别的图层
    	params.setlayermode(identifyparameters.all_layers);//设置模式为识别服务上所有的图层
    }

	/**
	 * 单击地图
	 */
	public boolean onsingletap(motionevent point) {
		//屏幕坐标转化成空间坐标
		point mappoint = map.tomappoint(point.getx(),point.gety());
		if(variable.singlequery&&geotype ==null){
			params.setgeometry(mappoint);
		    params.setspatialreference(map.getspatialreference());    // 设置坐标系                                         
		    params.setmapheight(map.getheight());
		    params.setmapwidth(map.getwidth());
		    envelope env = new envelope();
		    map.getextent().queryenvelope(env);
		    params.setmapextent(env);
		      //我们自己扩展的异步类
		    myidentifytask mtask = new myidentifytask(context,map,mappoint);
		    mtask.execute(params);//执行异步操作并传递所需的参数    
		}
		
		if(geotype == geometry.type.polygon)
			points.add(mappoint);//将当前点加入点集合中
		if(geotype == null)
			return true;
		if(geotype == geometry.type.point){
			//画点
			graphic graphic = new graphic(mappoint,markersymbol);
			graphicslayer.addgraphic(graphic);
		}else{
			if(endponit==null){
				//线或者面的第一个点
				graphic graphic = new graphic(mappoint,markersymbol);
				graphicslayer.addgraphic(graphic);
			}else{
				//画点
				graphic graphic = new graphic(mappoint,markersymbol);
				graphicslayer.addgraphic(graphic);
				//两点连线
				line line = new line() ;
				line.setstart(endponit);//起始点 
				line.setend(mappoint);//终止点
				
				//画折线
				if(geotype == geometry.type.polyline){
					polyline polyline = new polyline(); 
					polyline.addsegment(line, true);  
		            graphic igraphic=new graphic(polyline,linesymbol); 
		            graphicslayer.addgraphic(igraphic);
		            if(variable.measurelength)
		            	measure(endponit,mappoint,geotype);
				}
				if(geotype == geometry.type.polygon){
					graphicslayer.removeall();
					  //画面
				      if(polygon==null){  
		                  polygon=new polygon(); 
		                  webpolygon=new polygon();
		              }  
				      polygon polygon = new polygon();  
				      point startpoint = null;  
			          point endpoint = null;  	
			          // 绘制完整的多边形  
			           for(int i=1;i1000){
				mathlength=mathlength/1000;
				string format = new decimalformat("0.00").format(mathlength);//保留小数点后两位
				length = format+"公里";
			}else{
				string format = new decimalformat("0.00").format(mathlength);//保留小数点后两位
				length = format+"米";
			}
			toast.maketext(context, "距离:"+length, toast.length_short).show();
		}
		
		if(geotype == geometry.type.polygon ){ 
			polygon polygon = new polygon();  	  
            point startpoint = null;  
            point endpoint = null;  
            // 绘制完整的多边形  
            for(int i=1;i1000000){
				matharea2d=matharea2d/1000000;
				string format = new decimalformat("0.00").format(matharea2d);//保留小数点后两位
				area = format+"平方公里";
			}else{
				string format = new decimalformat("0.00").format(matharea2d);//保留小数点后两位
				area = format+"平方米";
			}
			toast.maketext(context, "面积:"+area, toast.length_short).show();
		}
		
	}

}
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