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本文实例讲述了android实现在map上画出路线的方法。分享给大家供大家参考。具体如下：
最近在搞在地图上画出路线图，经过一段时间的摸索，终于搞明白了，其实也挺简单的，写个类继承overlay，并重写draw方法，在draw方法中画出 path即可。对于overaly，在地图上标记某个点或者画线之类的就要使用overlay，overlay相当于一个覆盖物，覆盖在地图上，这个覆盖物要自己实现所以要继承overlay。
mapactivity.java如下：
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package net.blogjava.mobile.map;
import java.util.list;
import android.app.alertdialog;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.path;
import android.graphics.point;
import android.location.address;
import android.location.geocoder;
import android.os.bundle;
import android.view.menu;
import com.google.android.maps.geopoint;
import com.google.android.maps.mapactivity;
import com.google.android.maps.mapcontroller;
import com.google.android.maps.mapview;
import com.google.android.maps.overlay;
import com.google.android.maps.projection;
public class main extends mapactivity {
private geopoint gpoint1, gpoint2, gpoint3;// 连线的点
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
mapview mapview = (mapview) findviewbyid(r.id.mapview);
mapview.setclickable(true);
mapview.setbuiltinzoomcontrols(true);
mapcontroller mapcontroller = mapview.getcontroller();
mapview.settraffic(true);// 交通图
// mapview.setsatellite(true);//卫星图
// mapview.setstreetview(true);//街景
myoverlay myoverlay = new myoverlay();
mapview.getoverlays().add(myoverlay);
mapcontroller.setzoom(15);// 初始放大倍数
gpoint1 = new geopoint((int) (24.477384 * 1000000),
(int) (118.158216 * 1000000));
gpoint2 = new geopoint((int) (24.488967 * 1000000),
(int) (118.144277 * 1000000));
gpoint3 = new geopoint((int) (24.491091 * 1000000),
(int) (118.136781 * 1000000));
mapcontroller.animateto(gpoint1);
}
@override
protected boolean isroutedisplayed() {
// todo auto-generated method stub
return false;
}
class myoverlay extends overlay {
@override
public void draw(canvas canvas, mapview mapview, boolean shadow) {
// todo auto-generated method stub
super.draw(canvas, mapview, shadow);
// 画笔
paint paint = new paint();
paint.setcolor(color.red);
paint.setdither(true);
paint.setstyle(paint.style.stroke);
paint.setstrokejoin(paint.join.round);
paint.setstrokecap(paint.cap.round);
paint.setstrokewidth(2);
projection projection = mapview.getprojection();
point p1 = new point();
point p2 = new point();
point p3 = new point();
projection.topixels(gpoint1, p1);
projection.topixels(gpoint2, p2);
projection.topixels(gpoint3, p3);
path path = new path();
path.moveto(p1.x, p1.y);
path.lineto(p2.x, p2.y);
path.lineto(p3.x, p3.y);
canvas.drawpath(path, paint);// 画出路径
}
}
}
main.xml如下：
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.google.android.maps.mapview android:id="@+id/mapview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:apikey="0ib7kn70qp1lt216hhb-jmhj8gltie4p63o77kq" /> </linearlayout>
最后别忘了加权限 ：
<uses-permission android:name="android.permission.internet"/>
在<applacation></applacation>之间加<uses-library android:name="com.google.android.maps" />
绘制路线图：
/**
* 通过解析google map返回的xml，在map中画路线图
*/
public void drawroute(){
string url = "http://maps.google.com/maps/api/directions/xml?origin=23.055291,113.391802" + "&destination=23.046604,113.397510&sensor=false&mode=walking";
httpget get = new httpget(url);
string strresult = "";
try {
httpparams httpparameters = new basichttpparams();
httpconnectionparams.setconnectiontimeout(httpparameters, 3000);
httpclient httpclient = new defaulthttpclient(httpparameters);
httpresponse httpresponse = null;
httpresponse = httpclient.execute(get);
if (httpresponse.getstatusline().getstatuscode() == 200){
strresult = entityutils.tostring(httpresponse.getentity());
}
} catch (exception e) {
return;
}
if (-1 == strresult.indexof("<status>ok</status>")){
toast.maketext(this, "获取导航路线失败!", toast.length_short).show();
this.finish();
return;
}
int pos = strresult.indexof("<overview_polyline>");
pos = strresult.indexof("<points>", pos + 1);
int pos2 = strresult.indexof("</points>", pos);
strresult = strresult.substring(pos + 8, pos2);
list<geopoint> points = decodepoly(strresult);
myoverlay moverlay = new myoverlay(points);
list<overlay> overlays = mmapview.getoverlays();
overlays.add(moverlay);
if (points.size() >= 2){
mmapcontroller.animateto(points.get(0));
}
mmapview.invalidate();
}
/**
* 解析返回xml中overview_polyline的路线编码
*
* @param encoded
* @return
*/
private list<geopoint> decodepoly(string encoded) {
list<geopoint> poly = new arraylist<geopoint>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charat(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charat(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
geopoint p = new geopoint((int) (((double) lat / 1e5) * 1e6),(int) (((double) lng / 1e5) * 1e6));
poly.add(p);
}
return poly;
}
希望本文所述对大家的android程序设计有所帮助。
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