myMKSearch.transitSearch("北京", start, end); // 必须设置城市名。

MKPlanNode start = new MKPlanNode();
start.name = "王府井";//关键字方式
//start.pt = new GeoPoint((int) (39.915 * 1E6), (int) (116.404 * 1E6));//经纬度方式

myMKSearch.setTransitPolicy(MKSearch.EBUS_NO_SUBWAY); //不乘坐地铁

TransitOverlay transitOverlay = new TransitOverlay(YingTransitActivity.this, mMapView);//创建公交覆盖物对象           
transitOverlay.setData(res.getPlan(0));// 此处仅展示一个方案作为示例
mMapView.getOverlays().add(transitOverlay);//添加覆盖物到地图上
mMapView.invalidate();  //刷新地图

package com.baidu.yingTransit;

import android.app.Activity;
import android.os.Bundle;

/** 引入import **/
import java.util.ArrayList;
import java.util.List;
 
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
 
import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.GeoPoint;
import com.baidu.mapapi.ItemizedOverlay;
import com.baidu.mapapi.LocationListener;
import com.baidu.mapapi.MKAddrInfo;
import com.baidu.mapapi.MKBusLineResult;
import com.baidu.mapapi.MKDrivingRouteResult;
import com.baidu.mapapi.MKGeneralListener;
import com.baidu.mapapi.MKLocationManager;
import com.baidu.mapapi.MKPlanNode;
import com.baidu.mapapi.MKPoiInfo;
import com.baidu.mapapi.MKPoiResult;
import com.baidu.mapapi.MKSearch;
import com.baidu.mapapi.MKSearchListener;
import com.baidu.mapapi.MKSuggestionResult;
import com.baidu.mapapi.MKTransitRouteResult;
import com.baidu.mapapi.MKWalkingRouteResult;
import com.baidu.mapapi.MapActivity;
import com.baidu.mapapi.MapController;
import com.baidu.mapapi.MapView;
import com.baidu.mapapi.MyLocationOverlay;
import com.baidu.mapapi.Overlay;
import com.baidu.mapapi.OverlayItem;
import com.baidu.mapapi.PoiOverlay;
import com.baidu.mapapi.RouteOverlay;
import com.baidu.mapapi.TransitOverlay;


public class YingTransitActivity extends MapActivity {
    
    /** 申明变量 **/
    BMapManager mBMapMan = null;
    MapView mMapView = null; 
    MKSearch myMKSearch = null;    //POI搜索变量申明
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        /** 创建地图 **/
        mBMapMan = new BMapManager(getApplication());
        mBMapMan.init("1713A92A7A0C854D1B8717670EF8B6CA75696567", null);
        super.initMapActivity(mBMapMan);
         
        mMapView = (MapView) findViewById(R.id.bmapsView);//地图控件，不添加的话，就不用写。
        mMapView.setBuiltInZoomControls(true);  //设置启用内置的缩放控件
        MapController mMapController = mMapView.getController();  // 得到mMapView的控制权,可以用它控制和驱动平移和缩放
        GeoPoint point = new GeoPoint((int) (39.915 * 1E6),
                (int) (116.404 * 1E6));  //用给定的经纬度构造一个GeoPoint，单位是微度 (度 * 1E6)
        mMapController.setCenter(point);  //设置地图中心点
        mMapController.setZoom(14);    //设置地图zoom级别
        
        myMKSearch = new MKSearch();  //初始化

        myMKSearch.init(mBMapMan, new MKSearchListener(){
            @Override
            public void onGetPoiResult(MKPoiResult result, int type, int error) {
            }

            public void onGetDrivingRouteResult(MKDrivingRouteResult res, int error) {
            }
            public void onGetTransitRouteResult(MKTransitRouteResult res, int error) {                
                if (res == null) {return;}
                TransitOverlay transitOverlay = new TransitOverlay(YingTransitActivity.this, mMapView);
                // 此处仅展示一个方案作为示例
                transitOverlay.setData(res.getPlan(0));
                mMapView.getOverlays().add(transitOverlay);
                mMapView.invalidate();  //刷新地图
            }
            public void onGetWalkingRouteResult(MKWalkingRouteResult res, int error) {
            }
            public void onGetAddrResult(MKAddrInfo res, int error) {
            }
            public void onGetBusDetailResult(MKBusLineResult result, int error) {                
            }

            @Override
            public void onGetSuggestionResult(MKSuggestionResult result, int error) {
            
            }
            
        });
        
        /** 公交导航查询 **/
        MKPlanNode start = new MKPlanNode();
        start.name = "王府井";//关键字方式
        //start.pt = new GeoPoint((int) (39.915 * 1E6), (int) (116.404 * 1E6));//经纬度方式
        MKPlanNode end = new MKPlanNode();
        end.name = "西单"; //关键词方式
        //end.pt = new GeoPoint(40057031, 116307852);//经纬度方式
        myMKSearch.setTransitPolicy(MKSearch.EBUS_NO_SUBWAY); //公交策略：EBUS_TIME_FIRST:时间优先；EBUS_TRANSFER_FIRST:少换乘；EBUS_WALK_FIRST:少步行；EBUS_NO_SUBWAY: 非地铁
        myMKSearch.transitSearch("北京", start, end); // 必须设置城市名。start和end可通过关键字，坐标两种方式指定，但必须使用MKPlanNode接口。
    }
    
    protected boolean isRouteDisplayed() {
        return false;
    }
    
    /** 引入方法管理API **/
    @Override
    protected void onDestroy() {
        if (mBMapMan != null) {
            mBMapMan.destroy();
            mBMapMan = null;
        }
        super.onDestroy();
    }
    @Override
    protected void onPause() {
        if (mBMapMan != null) {
            mBMapMan.stop();
        }
        super.onPause();
    }
    @Override
    protected void onResume() {
        if (mBMapMan != null) {
            mBMapMan.start();
        }
        super.onResume();
    }
    
}