Android引路蜂地图开发示例：路径查询

可以通过RasterMap的getDirection()方法来查询路径，和查询地址类似，路径查询的结果也是通过回调函数的方式来通知应用程序的，下面的例子返回南京到北京的路径。返回结果存放在MapDirection中，MapDirection包含了路径的详细信息，包括路径的每个步骤，长度，时间，方向等。

[java]
package com.pstreets.gisengine.demo;

import com.mapdigit.gis.MapDirection;
import com.mapdigit.gis.MapPoint;
import com.mapdigit.gis.geometry.GeoLatLng;
import com.mapdigit.gis.service.IRoutingListener;
import com.pstreets.gisengine.R;
import com.pstreets.gisengine.SharedMapInstance;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class MapRouting extends Activity implements IRoutingListener {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

@Override
public void onStart() {
super.onStart();
GeoLatLng center = new GeoLatLng(32.0616667, 118.7777778);
SharedMapInstance.map.setCenter(center, 15,
    com.mapdigit.gis.raster.MapType.MICROSOFTCHINA);
SharedMapInstance.map.setRoutingListener(this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.maprouting_menu, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.getdirection:
   String name1 = "南京";
   String name2 = "北京";
   SharedMapInstance.map.getDirections("from: " + name1 + " to: "
     + name2);

   return true;

default:
   return super.onOptionsItemSelected(item);
}

}

@Override
public void done(String query, MapDirection result) {
if (result != null) {
   SharedMapInstance.map.setMapDirection(result);
   SharedMapInstance.map.resize(result.getBound());
   SharedMapInstance.map.zoomOut();
   SharedMapInstance.map.zoomOut();

}

}

@Override
public void readProgress(int bytes, int total) {

}

}
package com.pstreets.gisengine.demo;

import com.mapdigit.gis.MapDirection;
import com.mapdigit.gis.MapPoint;
import com.mapdigit.gis.geometry.GeoLatLng;
import com.mapdigit.gis.service.IRoutingListener;
import com.pstreets.gisengine.R;
import com.pstreets.gisengine.SharedMapInstance;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class MapRouting extends Activity implements IRoutingListener {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

@Override
public void onStart() {
super.onStart();
GeoLatLng center = new GeoLatLng(32.0616667, 118.7777778);
SharedMapInstance.map.setCenter(center, 15,
    com.mapdigit.gis.raster.MapType.MICROSOFTCHINA);
SharedMapInstance.map.setRoutingListener(this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.maprouting_menu, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.getdirection:
   String name1 = "南京";
   String name2 = "北京";
   SharedMapInstance.map.getDirections("from: " + name1 + " to: "
     + name2);

   return true;

default:
   return super.onOptionsItemSelected(item);
}

}

@Override
public void done(String query, MapDirection result) {
if (result != null) {
   SharedMapInstance.map.setMapDirection(result);
   SharedMapInstance.map.resize(result.getBound());
   SharedMapInstance.map.zoomOut();
   SharedMapInstance.map.zoomOut();

}

}

@Override
public void readProgress(int bytes, int total) {

}

}

地图服务可以选择使用Google 地图服务，CloudMade地图服务，在中国还可能选择MapAbc地图服务，缺省使用Google 地图服务。
getDirections()具有三个重载函数，例子中是采用的文字描述方式。上述示例采用了from: address1 to: address2 的格式， CloudMade地图服务和MapAbc地图服务则必需采用经度１，纬度１，经度２，纬度２和格式。
为避免混淆，可以使用下述格式。
public void getDirection(GeoLatLng[] waypoints, IRoutingListener listener);
其中 waypoints 为途径点坐标数组经纬值，可以支持多点路径查询。
此外对于MapAbc 地图服务，还可以指定城市编码，如南京编码为２５。
public void getDirection(int citycode,String query, IRoutingListener listener);

作者：mapdigit

补充：移动开发 , Android ,