基于百度地图实现检索指定城市指定公交的交通路线图，效果如图所示

    public class App extends Application {      static App mDemoApp;      //百度MapAPI的管理类      public BMapManager mBMapMan = null;      // 授权Key      // 申请地址：http://dev.baidu.com/wiki/static/imap/key/      public String mStrKey = "Your APPKey";      boolean m_bKeyRight = true;    // 授权Key正确，验证通过      // 常用事件监听，用来处理通常的网络错误，授权验证错误等      public static class MyGeneralListener implements MKGeneralListener {          @Override          public void onGetNetworkState(int iError) {              Log.d("MyGeneralListener", "onGetNetworkState error is "+ iError);              Toast.makeText(App.mDemoApp.getApplicationContext(), "您的网络出错啦！",                      Toast.LENGTH_LONG).show();          }          @Override          public void onGetPermissionState(int iError) {              Log.d("MyGeneralListener", "onGetPermissionState error is "+ iError);              if (iError ==  MKEvent.ERROR_PERMISSION_DENIED) {                  // 授权Key错误：                  Toast.makeText(App.mDemoApp.getApplicationContext(),                           "文件输入正确的授权Key！",                          Toast.LENGTH_LONG).show();                  App.mDemoApp.m_bKeyRight = false;              }          }      }      @Override      public void onCreate() {          Log.v("BMapApiDemoApp", "onCreate");          mDemoApp = this;          mBMapMan = new BMapManager(this);          mBMapMan.init(this.mStrKey, new MyGeneralListener());          mBMapMan.getLocationManager().setNotifyInternal(10, 5);                    super.onCreate();      }        @Override      //app的退出之前调用mapadpi的destroy()函数，避免重复初始化带来的时间消耗      public void onTerminate() {          if (mBMapMan != null) {              mBMapMan.destroy();              mBMapMan = null;          }          super.onTerminate();      }    }

CustomRouteOverLay组件扩展RouteOverlay：

CustomOverlayItem扩展ItemizedOverlay<OverlayItem>：

CustomRouteOverLay类代码：

public class CustomRouteOverLay extends RouteOverlay {      public Activity ac;      private MapView mapView;      static ArrayList<View> overlayviews = new ArrayList<View>();      public CustomRouteOverLay(Activity arg0, MapView arg1) {          super(arg0, arg1);          ac = arg0;          mapView = arg1;          // TODO Auto-generated constructor stub      }        @Override      protected boolean onTap(int arg0) {          // TODO Auto-generated method stub          // return super.onTap(arg0);          return true;      }        @Override      public void setData(MKRoute arg0) {          // TODO Auto-generated method stub          super.setData(arg0);          addHint(arg0);      }                  public void addHints(MKRoute routes) {          for (int i = 0; i < routes.getNumSteps(); i++) {              Drawable marker = ac.getResources().getDrawable(R.drawable.pop); // 得到需要标在地图上的资源              marker.setBounds(0, 0, marker.getIntrinsicWidth(),                      marker.getIntrinsicHeight()); // 为maker定义位置和边界              OverItemT overitem = new OverItemT(marker,ac, routes.getStep(i).getContent(),routes.getStep(i).getPoint());  //            OverlayItem over=new OverlayItem(routes.GET, null, null);              mapView.getOverlays().add(overitem); // 添加ItemizedOverlay实例到mMapView          }          mapView.invalidate();      }      /**       * 增加 指示路线       * @param routes       */      public void addHint(MKRoute routes) {          mapView.getOverlays().clear();// 先清空  //        mapView.removeAllViewsInLayout();          View mPopView = ac.getLayoutInflater().inflate(R.layout.popview,                  null);          for(int i=0;i<    overlayviews.size();i++){              System.out.println("remove &"+i);              mapView.removeViewInLayout(overlayviews.get(i));              overlayviews.remove(i);          }                mapView.invalidate();          // 添加ItemizedOverlay          for (int i = 0; i < routes.getNumSteps(); i++) {                Drawable marker = ac.getResources().getDrawable(R.drawable.pop); // 得到需要标在地图上的资源              marker.setBounds(0, 0, marker.getIntrinsicWidth(),                      marker.getIntrinsicHeight()); // 为maker定义位置和边界              GeoPoint pt = routes.getStep(i).getPoint();// =                                                          // routes.get(i).getPoint();              if (i != 0 && i != routes.getNumSteps() - 1) {                  mPopView = ac.getLayoutInflater().inflate(R.layout.popview,                          null);                  mapView.addView(mPopView, new MapView.LayoutParams(                          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, null,                          MapView.LayoutParams.TOP_LEFT));                  mPopView.setVisibility(View.GONE);                  mapView.updateViewLayout(mPopView, new MapView.LayoutParams(                          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, pt,                          MapView.LayoutParams.BOTTOM_CENTER));                  mPopView.setVisibility(View.VISIBLE);                  Button button = (Button) mPopView.findViewById(R.id.overlay_pop);                  button.setText(routes.getStep(i).getContent());                  overlayviews.add(mPopView);                  overlayviews.add(button);              } else {                  //修改起始点和终点样式-自定义                  mPopView = ac.getLayoutInflater().inflate(R.layout.popview,                          null);                  mapView.addView(mPopView, new MapView.LayoutParams(                          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, null,                          MapView.LayoutParams.TOP_LEFT));                  mPopView.setVisibility(View.GONE);                  mapView.updateViewLayout(mPopView, new MapView.LayoutParams(                          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, pt,                          MapView.LayoutParams.BOTTOM_CENTER));                  mPopView.setVisibility(View.VISIBLE);                  Button button = (Button) mPopView.findViewById(R.id.overlay_pop);                  button.offsetTopAndBottom(100);                  button.setTextColor(Color.BLUE);                  button.setBackgroundColor(Color.TRANSPARENT);                  button.setText(routes.getStep(i).getContent());                  overlayviews.add(mPopView);                  overlayviews.add(button);              }          }      }        class OverItemT extends ItemizedOverlay<OverlayItem> {            private Drawable marker;          private Context mContext;          private GeoPoint p;          private OverlayItem o;          public OverItemT(Drawable marker, Context context, String title,GeoPoint p) {              super(boundCenterBottom(marker));              this.marker = marker;              this.mContext = context;              this.p = p;              // 构造OverlayItem的三个参数依次为：item的位置，标题文本，文字片段              o = new OverlayItem(p, title, title);              populate(); // createItem(int)方法构造item。一旦有了数据，在调用其它方法前，首先调用这个方法          }          public void updateOverlay() {              populate();          }            @Override          public void draw(Canvas canvas, MapView mapView, boolean shadow) {              // Projection接口用于屏幕像素坐标和经纬度坐标之间的变换              Projection projection = mapView.getProjection();              for (int index = size() - 1; index >= 0; index--) { // 遍历mGeoList                  OverlayItem overLayItem = getItem(index); // 得到给定索引的item                  String title = overLayItem.getTitle();                  // 把经纬度变换到相对于MapView左上角的屏幕像素坐标                  Point point = projection.toPixels(overLayItem.getPoint(), null);                  // 可在此处添加您的绘制代码                  Paint paintText = new Paint();                  paintText.setColor(Color.BLUE);                  paintText.setTextSize(15);                  canvas.drawText(title, point.x - 30, point.y, paintText); // 绘制文本              }              super.draw(canvas, mapView, shadow);              // 调整一个drawable边界，使得（0，0）是这个drawable底部最后一行中心的一个像素              boundCenterBottom(marker);          }            @Override          protected OverlayItem createItem(int i) {              // TODO Auto-generated method stub              return o;          }            @Override          public int size() {              // TODO Auto-generated method stub              return 1;          }            @Override          // 处理当点击事件          protected boolean onTap(int i) {              // 更新气泡位置,并使之显示              return true;          }            @Override          public boolean onTap(GeoPoint arg0, MapView arg1) {              // TODO Auto-generated method stub              // 消去弹出的气泡              // ItemizedOverlayDemo.mPopView.setVisibility(View.GONE);              return super.onTap(arg0, arg1);          }      }    }

CustomOverlayItem代码：

public class CustomOverlayItem extends ItemizedOverlay<OverlayItem> {      // private List<OverlayItem> GeoList = new ArrayList<OverlayItem>();      private Context mContext;      private OverlayItem overlay;      boolean showtext;  //    private String title;      private Drawable marker;        public CustomOverlayItem(Drawable marker, Context context, GeoPoint p,              String title,String sinppet, boolean showtext) {          super(boundCenterBottom(marker));          this.mContext = context;          // 用给定的经纬度构造GeoPoint，单位是微度 (度 * 1E6)  //        point = p;          this.showtext = showtext;  //        this.title = title;          this.marker = marker;          overlay = new OverlayItem(p, title, sinppet);          populate(); // createItem(int)方法构造item。一旦有了数据，在调用其它方法前，首先调用这个方法      }        @Override      protected OverlayItem createItem(int i) {          return overlay;      }        @Override      public int size() {          return 1;      }        @Override      public void draw(Canvas canvas, MapView mapView, boolean arg2) {          // TODO Auto-generated method stub          super.draw(canvas, mapView, arg2);          // Projection接口用于屏幕像素坐标和经纬度坐标之间的变换          Projection projection = mapView.getProjection();          String title = overlay.getTitle();          // 把经纬度变换到相对于MapView左上角的屏幕像素坐标          Point point = projection.toPixels(overlay.getPoint(), null);          // 可在此处添加您的绘制代码          Paint paintText = new Paint();          Paint paint = new Paint();          paint.setAlpha(255);          paint.setColor(Color.DKGRAY);          paint.setStrokeWidth(5);          paintText.setColor(Color.BLUE);          paintText.setTextSize(15);  //        canvas.drawCircle(point.x, point.y, 100, paint);          canvas.drawText(title, point.x-30, point.y-50, paintText); // 绘制文本          // 调整一个drawable边界，使得（0，0）是这个drawable底部最后一行中心的一个像素          boundCenterBottom(marker);      }        @Override      // 处理当点击事件      protected boolean onTap(int i) {          if (showtext)              Toast.makeText(this.mContext, overlay.getTitle(), Toast.LENGTH_SHORT).show();          return true;      }  }

public class BuslineSearch extends MapActivity {      Button mBtnSearch = null; // 搜索按钮      MapView mMapView = null; // 地图View      MKSearch mSearch = null; // 搜索模块，也可去掉地图模块独立使用      String mCityName = null;      LocationListener loc_listener;      App app = null;      static boolean flag = false;      static Thread thread;      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.buslinesearch);            app = (App) this.getApplication();          if (app.mBMapMan == null) {              app.mBMapMan = new BMapManager(getApplication());              app.mBMapMan.init(app.mStrKey, new App.MyGeneralListener());          }          app.mBMapMan.start();          // 如果使用地图SDK，请初始化地图Activity          super.initMapActivity(app.mBMapMan);          mMapView = (MapView) findViewById(R.id.bmapView);          mMapView.setBuiltInZoomControls(true);          // 设置在缩放动画过程中也显示overlay,默认为不绘制          mMapView.setDrawOverlayWhenZooming(true);          mMapView.setBuiltInZoomControls(true);          // 初始化搜索模块，注册事件监听          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(15); // 设置地图zoom级别          mSearch = new MKSearch();          mSearch.init(app.mBMapMan, new MKSearchListener() {              public void onGetPoiResult(MKPoiResult res, int type, int error) {                  // 错误号可参考MKEvent中的定义                  if (error != 0 || res == null) {                      Toast.makeText(BuslineSearch.this, "抱歉，未找到结果",                              Toast.LENGTH_LONG).show();                      return;                  }                  // System.out.println(res.toString());                  // 找到公交路线poi node                  MKPoiInfo curPoi = null;                  int totalPoiNum = res.getNumPois();                  for (int idx = 0; idx < totalPoiNum; idx++) {                      Log.d("busline", "the busline is " + idx);                      curPoi = res.getPoi(idx);                      if (2 == curPoi.ePoiType) {                          break;                      }                  }                  mSearch.busLineSearch(mCityName, curPoi.uid);              }                public void onGetDrivingRouteResult(MKDrivingRouteResult res,                      int error) {              }                public void onGetTransitRouteResult(MKTransitRouteResult res,                      int error) {                  res.getPlan(0).getDistance();              }                public void onGetWalkingRouteResult(MKWalkingRouteResult res,                      int error) {              }                public void onGetAddrResult(MKAddrInfo res, int error) {              }                public void onGetBusDetailResult(MKBusLineResult result, int iError) {                  if (iError != 0 || result == null) {                      Toast.makeText(BuslineSearch.this, "抱歉，未找到结果",                              Toast.LENGTH_LONG).show();                      return;                  }                  // result.getBusRoute().get                  // result.getBusRoute().getStart().toString();                  CustomRouteOverLay routeOverlay = new CustomRouteOverLay(                          BuslineSearch.this, mMapView);                                routeOverlay.setData(result.getBusRoute());                  mMapView.getOverlays().clear();                  System.out.println(mMapView.getOverlays().size());                  mMapView.getOverlays().add(routeOverlay);                  mMapView.invalidate();                  mMapView.getController().animateTo(                          result.getBusRoute().getStart());              }                @Override              public void onGetSuggestionResult(MKSuggestionResult res, int arg1) {                  // TODO Auto-generated method stub                }          });            // mLocationManager.requestLocationUpdates(listener);          // 注册定位事件          loc_listener = new LocationListener() {                @Override              public void onLocationChanged(Location location) {                  if (location != null) {                      String strLog = String.format("您当前的位置:\r\n" + "纬度:%f\r\n"                              + "经度:%f", location.getLongitude(),                              location.getLatitude());                      flag = true;                      Drawable marker = getResources()                              .getDrawable(R.drawable.ic_launcher);                      final GeoPoint p = new GeoPoint(                              (int) (location.getLatitude() * 1E6),                              (int) (location.getLongitude() * 1E6));                      CustomOverlayItem item = new CustomOverlayItem(marker,                              BuslineSearch.this, p, "我的位置", "", false);                      mMapView.getOverlays().add(item);                      mMapView.getController().animateTo(p);                  }              }          };          // 设定搜索按钮的响应          mBtnSearch = (Button) findViewById(R.id.search);            OnClickListener clickListener = new OnClickListener() {              public void onClick(View v) {                  SearchButtonProcess(v);              }          };            mBtnSearch.setOnClickListener(clickListener);      }        void SearchButtonProcess(View v) {          if (mBtnSearch.equals(v)) {              mMapView.getOverlays().clear();              mMapView.getOverlays().removeAll(mMapView.getOverlays());              mMapView.invalidate();              EditText editCity = (EditText) findViewById(R.id.city);              EditText editSearchKey = (EditText) findViewById(R.id.searchkey);              mCityName = editCity.getText().toString();              mSearch.poiSearchInCity(mCityName, editSearchKey.getText()                      .toString());          }      }        @Override      protected void onPause() {          if (null == app)              app = (App) this.getApplication();          app.mBMapMan.getLocationManager().removeUpdates(loc_listener);          app.mBMapMan.stop();          super.onPause();      }        @Override      protected void onResume() {          if (null == app)              app = (App) this.getApplication();          app.mBMapMan.start();          super.onResume();          app.mBMapMan.getLocationManager().requestLocationUpdates(loc_listener);// 定位      }        @Override      protected boolean isRouteDisplayed() {          // TODO Auto-generated method stub          return false;      }        @Override      protected void onDestroy() {          // TODO Auto-generated method stub          super.onDestroy();      }  }