WalkRouteOverlay.java

package com.dingmouren.dingdingmap.util;

import android.content.Context;

import com.amap.api.maps.AMap;
import com.amap.api.maps.model.BitmapDescriptor;
import com.amap.api.maps.model.LatLng;
import com.amap.api.maps.model.MarkerOptions;
import com.amap.api.maps.model.PolylineOptions;
import com.amap.api.services.core.LatLonPoint;
import com.amap.api.services.route.WalkPath;
import com.amap.api.services.route.WalkStep;

import java.util.List;

/**
 * 步行路线图层类。在高德地图API里，如果要显示步行路线规划，可以用此类来创建步行路线图层。如不满足需求，也可以自己创建自定义的步行路线图层。
 * @since V2.1.0
 */
public class WalkRouteOverlay extends RouteOverlay {

    private PolylineOptions mPolylineOptions;

    private BitmapDescriptor walkStationDescriptor= null;

    private WalkPath walkPath;
	/**
	 * 通过此构造函数创建步行路线图层。
	 * @param context 当前activity。
	 * @param amap 地图对象。
	 * @param path 步行路线规划的一个方案。详见搜索服务模块的路径查询包（com.amap.api.services.route）中的类 <strong><a href="../../../../../../Search/com/amap/api/services/route/WalkStep.html" title="com.amap.api.services.route中的类">WalkStep</a></strong>。
	 * @param start 起点。详见搜索服务模块的核心基础包（com.amap.api.services.core）中的类<strong><a href="../../../../../../Search/com/amap/api/services/core/LatLonPoint.html" title="com.amap.api.services.core中的类">LatLonPoint</a></strong>。
	 * @param end 终点。详见搜索服务模块的核心基础包（com.amap.api.services.core）中的类<strong><a href="../../../../../../Search/com/amap/api/services/core/LatLonPoint.html" title="com.amap.api.services.core中的类">LatLonPoint</a></strong>。
	 * @since V2.1.0
	 */
	public WalkRouteOverlay(Context context, AMap amap, WalkPath path,
							LatLonPoint start, LatLonPoint end) {
		super(context);
		this.mAMap = amap;
		this.walkPath = path;
		startPoint = AMapServicesUtil.convertToLatLng(start);
		endPoint = AMapServicesUtil.convertToLatLng(end);
	}
	/**
	 * 添加步行路线到地图中。
	 * @since V2.1.0
	 */
    public void addToMap() {

        initPolylineOptions();
        try {
            List<WalkStep> walkPaths = walkPath.getSteps();
            mPolylineOptions.add(startPoint);
            for (int i = 0; i < walkPaths.size(); i++) {
                WalkStep walkStep = walkPaths.get(i);
                LatLng latLng = AMapServicesUtil.convertToLatLng(walkStep
                        .getPolyline().get(0));
                
				addWalkStationMarkers(walkStep, latLng);
                addWalkPolyLines(walkStep);
               
            }
            mPolylineOptions.add(endPoint);
            addStartAndEndMarker();

            showPolyline();
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }
	
	/**
	 * 检查这一步的最后一点和下一步的起始点之间是否存在空隙
	 */
	private void checkDistanceToNextStep(WalkStep walkStep,
			WalkStep walkStep1) {
		LatLonPoint lastPoint = getLastWalkPoint(walkStep);
		LatLonPoint nextFirstPoint = getFirstWalkPoint(walkStep1);
		if (!(lastPoint.equals(nextFirstPoint))) {
			addWalkPolyLine(lastPoint, nextFirstPoint);
		}
	}

	/**
	 * @param walkStep
	 * @return
	 */
	private LatLonPoint getLastWalkPoint(WalkStep walkStep) {
		return walkStep.getPolyline().get(walkStep.getPolyline().size() - 1);
	}

	/**
	 * @param walkStep
	 * @return
	 */
	private LatLonPoint getFirstWalkPoint(WalkStep walkStep) {
		return walkStep.getPolyline().get(0);
	}


    private void addWalkPolyLine(LatLonPoint pointFrom, LatLonPoint pointTo) {
        addWalkPolyLine(AMapServicesUtil.convertToLatLng(pointFrom), AMapServicesUtil.convertToLatLng(pointTo));
    }

    private void addWalkPolyLine(LatLng latLngFrom, LatLng latLngTo) {
        mPolylineOptions.add(latLngFrom, latLngTo);
    }

    /**
     * @param walkStep
     */
    private void addWalkPolyLines(WalkStep walkStep) {
        mPolylineOptions.addAll(AMapServicesUtil.convertArrList(walkStep.getPolyline()));
    }

    /**
     * @param walkStep
     * @param position
     */
    private void addWalkStationMarkers(WalkStep walkStep, LatLng position) {
        addStationMarker(new MarkerOptions()
                .position(position)
                .title("\u65B9\u5411:" + walkStep.getAction()
                        + "\n\u9053\u8DEF:" + walkStep.getRoad())
                .snippet(walkStep.getInstruction()).visible(nodeIconVisible)
                .anchor(0.5f, 0.5f).icon(walkStationDescriptor));
    }

    /**
     * 初始化线段属性
     */
    private void initPolylineOptions() {

        if(walkStationDescriptor == null) {
            walkStationDescriptor = getWalkBitmapDescriptor();
        }

        mPolylineOptions = null;

        mPolylineOptions = new PolylineOptions();
        mPolylineOptions.color(getWalkColor()).width(getRouteWidth());
    }


    private void showPolyline() {
        addPolyLine(mPolylineOptions);
    }
}