使用百度地图API实现驾车导航

做了一个利用百度地图API实现驾车导航的功能，不仅仅是驾车导航，利用这套API还可以实现公交以及步行的导航功能，这里只介绍如何实现驾车导航，步行和公交大同小异。首先来看看最后实现效果：

        

进入应用后首先显示蓝色点为当前位置，可以输入目的地来形成导航线路（图1），也可以点选地图上任意点来形成导航线路（图2，3），选定点后，在地图上会标注红色定位点，点击开始导航按钮后便会形成最佳驾车线路。

接下来看看实现步骤：

首先是工程结构

          

其中libs下面是申请百度开发者后到地图API下下载Android的地图支持包并导入工程，这里不再细说。

然后是布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="目的地："
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_destination"
            android:layout_width="fill_parent"
            android:hint="输入目的地名称或在地图上点选"
            android:textSize="14sp"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/btn_navi"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="开始导航" />

        <Button
            android:id="@+id/btn_clear"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="清除路线" />
    </LinearLayout>

    <com.baidu.mapapi.MapView
        android:id="@+id/bmapsView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="目的地："
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_destination"
            android:layout_width="fill_parent"
            android:hint="输入目的地名称或在地图上点选"
            android:textSize="14sp"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/btn_navi"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="开始导航" />

        <Button
            android:id="@+id/btn_clear"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="清除路线" />
    </LinearLayout>

    <com.baidu.mapapi.MapView
        android:id="@+id/bmapsView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true" />

</LinearLayout>

然后是实现自定义的地图图层MyItemizedOverlay.java，这个类的作用是实现可点击地图图层的作用，点击地图后，便可以显示当前位置的经纬度，并可设置为目的地。

/**
 * 自定义图层
 * @author Ryan
 */
public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    private Context context;

    public MyItemizedOverlay(Context context,Drawable drawale) {
        super(boundCenterBottom(drawale));
        this.context=context;
    }

    @Override
    protected OverlayItem createItem(int i) {
        return mOverlays.get(i);
    }

    @Override
    public int size() {
        return mOverlays.size();
    }

    // 点击地图标注显示的内容
    @Override
    protected boolean onTap(int index) {
        //这个方法的重写弹出信息等
        return true;
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        super.draw(canvas, mapView, shadow);
    }

    // Define a method in order to add new OverlayItems to our ArrayList
    public void addOverlay(OverlayItem overlay) {
        // add OverlayItems
        mOverlays.add(overlay);
        populate();
    }

    //该方法的重写可以相应点击图标的区域内还是外
    @Override
    public boolean onTap(GeoPoint p, MapView mapView) {
        final SharedPreferences sharedPreferences = context.getSharedPreferences("navigation_pre", Context.MODE_WORLD_WRITEABLE);

        //p获取的经纬度数据是整型变量,需要转换为float类型
        final float lat=p.getLatitudeE6();
        final float lon=p.getLongitudeE6();
        final MapView map = mapView;

        float latitude = sharedPreferences.getFloat("lat", 0);
        if (latitude == 0) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this.context);
            builder.setTitle("设置目的地");
            builder.setMessage("设置选中的点为目的地吗？");
            builder.setPositiveButton("确定",new OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    List<Overlay> overlays = map.getOverlays();
                    GeoPoint gpoint = new GeoPoint((int)lat,(int)lon);
                    OverlayItem overlayitem = new OverlayItem(gpoint, "title", "content");
                    Drawable drawale = context.getResources().getDrawable(R.drawable.current_mark);
                    MyItemizedOverlay iconOverlay = new MyItemizedOverlay(context,drawale);
                    // 添加图层
                    iconOverlay.addOverlay(overlayitem);
                    overlays.add(iconOverlay);
                    map.getController().animateTo(gpoint);

                    Editor editor = sharedPreferences.edit();
                    editor.putFloat("lat", lat);
                    editor.putFloat("lon", lon);
                    editor.commit();
                    Toast.makeText(context, "纬度:"+lat / 1E6+"\n经度:"+lon / 1E6, Toast.LENGTH_SHORT).show();
                }
            });
            builder.setNegativeButton("取消", null);
            builder.create().show();
        }else {
//          AlertDialog.Builder builder = new AlertDialog.Builder(this.context);
//          builder.setTitle("设置目的地");
//          builder.setMessage("已经设置过线路，请先点击清除路线按钮清除当前路线");
//          builder.setNegativeButton("确定", null);
//          builder.create().show();
            Toast.makeText(context, "已经设置过线路，请先点击清除路线按钮清除当前路线",Toast.LENGTH_SHORT).show();

        }

        return super.onTap(p, mapView);
    }
}

/**
 * 自定义图层
 * @author Ryan
 */
public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
	
	private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();	
	private Context context;
	
	public MyItemizedOverlay(Context context,Drawable drawale) {
		super(boundCenterBottom(drawale));		
		this.context=context;
	}
	
	@Override
	protected OverlayItem createItem(int i) {
		return mOverlays.get(i);
	}
	
	@Override
	public int size() {
		return mOverlays.size();
	}
	
	// 点击地图标注显示的内容
	@Override
	protected boolean onTap(int index) {
		//这个方法的重写弹出信息等
		return true;
	}
	
	@Override
	public void draw(Canvas canvas, MapView mapView, boolean shadow) {
		super.draw(canvas, mapView, shadow);
	}
	
	// Define a method in order to add new OverlayItems to our ArrayList
	public void addOverlay(OverlayItem overlay) {
		// add OverlayItems
		mOverlays.add(overlay);
		populate();
	}
	
	//该方法的重写可以相应点击图标的区域内还是外
	@Override
	public boolean onTap(GeoPoint p, MapView mapView) {
		final SharedPreferences sharedPreferences = context.getSharedPreferences("navigation_pre", Context.MODE_WORLD_WRITEABLE);
		
		//p获取的经纬度数据是整型变量,需要转换为float类型
		final float lat=p.getLatitudeE6();
		final float lon=p.getLongitudeE6();
		final MapView map = mapView;
		
		float latitude = sharedPreferences.getFloat("lat", 0);
		if (latitude == 0) {
			AlertDialog.Builder builder = new AlertDialog.Builder(this.context);
			builder.setTitle("设置目的地");
			builder.setMessage("设置选中的点为目的地吗？");
			builder.setPositiveButton("确定",new OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					List<Overlay> overlays = map.getOverlays();
					GeoPoint gpoint = new GeoPoint((int)lat,(int)lon);
					OverlayItem overlayitem = new OverlayItem(gpoint, "title", "content");
					Drawable drawale = context.getResources().getDrawable(R.drawable.current_mark);
					MyItemizedOverlay iconOverlay = new MyItemizedOverlay(context,drawale);
					// 添加图层
					iconOverlay.addOverlay(overlayitem);
					overlays.add(iconOverlay);
					map.getController().animateTo(gpoint);
					
					Editor editor = sharedPreferences.edit();
					editor.putFloat("lat", lat);
					editor.putFloat("lon", lon);
					editor.commit();
					Toast.makeText(context, "纬度:"+lat / 1E6+"\n经度:"+lon / 1E6, Toast.LENGTH_SHORT).show();	
				}
			});
			builder.setNegativeButton("取消", null);
			builder.create().show();
		}else {
//			AlertDialog.Builder builder = new AlertDialog.Builder(this.context);
//			builder.setTitle("设置目的地");
//			builder.setMessage("已经设置过线路，请先点击清除路线按钮清除当前路线");
//			builder.setNegativeButton("确定", null);
//			builder.create().show();
			Toast.makeText(context, "已经设置过线路，请先点击清除路线按钮清除当前路线",Toast.LENGTH_SHORT).show();	
			
		}
		
		return super.onTap(p, mapView);
	}	
}

最后是主Activity实现类，注释中有详细说明：

public class NavigationDemoActivity extends MapActivity {
    //Map key
    private String mMapKey = "你的MapKey，到百度开发者官网申请";

    private EditText destinationEditText = null;
    private Button startNaviButton = null;
    private Button clearButton = null;
    private MapView mapView = null;
    private BMapManager mMapManager = null;
    private MyLocationOverlay myLocationOverlay = null;
    //onResume时注册此listener，onPause时需要Remove,注意此listener不是Android自带的，是百度API中的
    private LocationListener locationListener = null;
    //搜索模块
    private MKSearch searchModel = null;
    private GeoPoint pt = null;
    private SharedPreferences sharedPreferences;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
        //弹出使用说明对话框
        showIntroduceDialog();

        sharedPreferences = this.getSharedPreferences("navigation_pre", Context.MODE_WORLD_WRITEABLE);
        destinationEditText = (EditText) this.findViewById(R.id.et_destination);
        startNaviButton = (Button) this.findViewById(R.id.btn_navi);
        clearButton = (Button) this.findViewById(R.id.btn_clear);

        //初始化地图管理器
        mMapManager = new BMapManager(getApplication());
        mMapManager.init(mMapKey, new MyGeneralListener());
        super.initMapActivity(mMapManager);

        mapView = (MapView) this.findViewById(R.id.bmapsView);
        //设置启用内置的缩放控件
        mapView.setBuiltInZoomControls(true);
        //设置在缩放动画过程中也显示overlay,默认为不绘制
//        mapView.setDrawOverlayWhenZooming(true);
        //设置初始化地图的缩放级别
        mapView.getController().setZoom(16);
        mapView.setClickable(true);

        //获取当前位置层
        myLocationOverlay = new MyLocationOverlay(this, mapView);
        //将当前位置的层添加到地图底层中
        mapView.getOverlays().add(myLocationOverlay);

        //添加可点选地图获取目的地的层
        addTapOverLay();

        //注册定位事件
        locationListener = new LocationListener(){

            @Override
            public void onLocationChanged(Location location) {
                if (location != null){
                    //生成GEO类型坐标并在地图上定位到该坐标标示的地点
                     pt = new GeoPoint((int)(location.getLatitude() * 1e6),
                            (int)(location.getLongitude() * 1e6));
                     mapView.getController().animateTo(pt);
                }
            }
        };

        //初始化搜索模块
        searchModel = new MKSearch();
        //设置路线策略为最短距离
        searchModel.setDrivingPolicy(MKSearch.ECAR_DIS_FIRST);
        searchModel.init(mMapManager, new MKSearchListener() {
            //获取驾车路线回调方法
            @Override
            public void onGetDrivingRouteResult(MKDrivingRouteResult res, int error) {
                // 错误号可参考MKEvent中的定义
                if (error != 0 || res == null) {
                    Toast.makeText(NavigationDemoActivity.this, "抱歉，未找到结果", Toast.LENGTH_SHORT).show();
                    return;
                }
                RouteOverlay routeOverlay = new RouteOverlay(NavigationDemoActivity.this, mapView);

                // 此处仅展示一个方案作为示例
                MKRoute route = res.getPlan(0).getRoute(0);
                int distanceM = route.getDistance();
                String distanceKm = String.valueOf(distanceM / 1000) +"."+String.valueOf(distanceM % 1000);
                System.out.println("距离:"+distanceKm+"公里---节点数量:"+route.getNumSteps());
                for (int i = 0; i < route.getNumSteps(); i++) {
                    MKStep step = route.getStep(i);
                    System.out.println("节点信息："+step.getContent());
                    System.out.println("经度："+step.getPoint().getLongitudeE6() / 1E6 +" 纬度："+step.getPoint().getLatitudeE6() / 1E6);
                }
                routeOverlay.setData(route);
                mapView.getOverlays().clear();
                mapView.getOverlays().add(routeOverlay);
                mapView.invalidate();
                mapView.getController().animateTo(res.getStart().pt);
            }

            //以下两种方式和上面的驾车方案实现方法一样
            @Override
            public void onGetWalkingRouteResult(MKWalkingRouteResult res, int error) {
                //获取步行路线
            }

            @Override
            public void onGetTransitRouteResult(MKTransitRouteResult arg0, int arg1) {
                //获取公交线路
            }

            @Override
            public void onGetBusDetailResult(MKBusLineResult arg0, int arg1) {
            }
            @Override
            public void onGetAddrResult(MKAddrInfo arg0, int arg1) {
            }
            @Override
            public void onGetSuggestionResult(MKSuggestionResult arg0, int arg1) {
            }
            @Override
            public void onGetPoiResult(MKPoiResult arg0, int arg1, int arg2) {
            }
        });

        startNaviButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String destination = destinationEditText.getText().toString();

                //设置起始地（当前位置）
                MKPlanNode startNode = new MKPlanNode();
                startNode.pt = pt;

                //设置目的地
                MKPlanNode endNode = new MKPlanNode();

                float lat = sharedPreferences.getFloat("lat", 0);
                float lon = sharedPreferences.getFloat("lon", 0);

                if (lat != 0 && lon != 0) {
                    endNode.pt = new GeoPoint((int)lat,(int)lon);
                }else if (!destination.equals("")) {
                    endNode.name = destination;
                }else {
                    Toast.makeText(NavigationDemoActivity.this, "请输入或点选目的地",Toast.LENGTH_SHORT).show();
                    return;
                }

                //展开搜索的城市
                String city = getResources().getString(R.string.beijing);
                searchModel.drivingSearch(city, startNode, city, endNode);

                //步行路线
//              searchModel.walkingSearch(city, startNode, city, endNode);
                //公交路线
//              searchModel.transitSearch(city, startNode, endNode);
            }
        });

        //清除路线按钮事件
        clearButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                List<Overlay> overlays = mapView.getOverlays();

                if (sharedPreferences.getFloat("lon", 0) != 0) {
                    //移除顶层的路线图层
                    overlays.remove(overlays.size() - 1);
                    //添加用户当前位置图层
                    overlays.add(myLocationOverlay);
                    //地图更新定位到当前位置
                    mapView.getController().animateTo(pt);

                    //清除存储的经纬度信息
                    Editor editor = sharedPreferences.edit();
                    editor.clear();
                    editor.commit();

                    //添加可点选图层
                    addTapOverLay();

                }else if (!destinationEditText.getText().toString().equals("")) {
                    overlays.remove(overlays.size() - 1);
                    overlays.add(myLocationOverlay);
                    mapView.getController().animateTo(pt);
                    addTapOverLay();
                }else {
                    Toast.makeText(NavigationDemoActivity.this, "没有设置路线", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    public void showIntroduceDialog(){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("使用说明");
        StringBuilder sb = new StringBuilder();
        sb.append("1.地图中蓝色点为当前位置；\n\n");
        sb.append("2.双指捏合或点击缩放按钮可以缩放地图；\n\n");
        sb.append("3.在输入框中输入目的地或在地图上点选目的地；\n\n");
        sb.append("4.选取目的地后点击按钮开始导航；\n\n");
        sb.append("5.点击清除按钮取消本次导航路线；");
        builder.setMessage(sb.toString());
        builder.setNegativeButton("确定", null);
        builder.create().show();
    }

    public void addTapOverLay(){
        //以一副透明图片标示可点选图层，这里在地图上不显示出来，只提供可点选目的地功能
        GeoPoint gpoint = new GeoPoint((int) (39.914714 * 1E6), (int) (116.404269 * 1E6));
        OverlayItem overlayitem = new OverlayItem(gpoint, "title", "content");
        Drawable drawale = getResources().getDrawable(R.drawable.current);
        MyItemizedOverlay iconOverlay = new MyItemizedOverlay(NavigationDemoActivity.this,drawale);
        // 添加图层
        iconOverlay.addOverlay(overlayitem);
        mapView.getOverlays().add(iconOverlay);
    }

    @Override
    protected void onResume() {
        mMapManager.getLocationManager().requestLocationUpdates(locationListener);
        myLocationOverlay.enableMyLocation();
        myLocationOverlay.enableCompass(); // 打开指南针
        mMapManager.start();

        super.onResume();
    }

    @Override
    protected void onPause() {
        mMapManager.getLocationManager().removeUpdates(locationListener);
        myLocationOverlay.disableMyLocation();//显示当前位置
        myLocationOverlay.disableCompass(); // 关闭指南针
        mMapManager.stop();
        super.onPause();
    }

    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }

    //按物理返回键退出应用时清空存储的经纬度信息
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
            Editor editor = sharedPreferences.edit();
            editor.clear();
            editor.commit();
        }
        return super.dispatchKeyEvent(event);
    }

    // 常用事件监听，用来处理通常的网络错误，授权验证错误等
    class MyGeneralListener implements MKGeneralListener {
            @Override
            public void onGetNetworkState(int iError) {
                Log.d("MyGeneralListener", "onGetNetworkState error is "+ iError);
                Toast.makeText(NavigationDemoActivity.this, "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(NavigationDemoActivity.this,
                            "请在BMapApiDemoApp.java文件输入正确的授权Key！",
                            Toast.LENGTH_LONG).show();
                }
            }
        }
}

public class NavigationDemoActivity extends MapActivity {
	//Map key
	private String mMapKey = "你的MapKey，到百度开发者官网申请";
	
	private EditText destinationEditText = null;
	private Button startNaviButton = null;
	private Button clearButton = null;
	private MapView mapView = null;
	private BMapManager mMapManager = null;
	private MyLocationOverlay myLocationOverlay = null;
	//onResume时注册此listener，onPause时需要Remove,注意此listener不是Android自带的，是百度API中的
	private LocationListener locationListener = null;
	//搜索模块
	private MKSearch searchModel = null;
	private GeoPoint pt = null;
	private SharedPreferences sharedPreferences;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
        //弹出使用说明对话框
        showIntroduceDialog();
        
        sharedPreferences = this.getSharedPreferences("navigation_pre", Context.MODE_WORLD_WRITEABLE);
        destinationEditText = (EditText) this.findViewById(R.id.et_destination);
        startNaviButton = (Button) this.findViewById(R.id.btn_navi);
        clearButton = (Button) this.findViewById(R.id.btn_clear);
        
        //初始化地图管理器
        mMapManager = new BMapManager(getApplication());
        mMapManager.init(mMapKey, new MyGeneralListener());
        super.initMapActivity(mMapManager);
        
        mapView = (MapView) this.findViewById(R.id.bmapsView);
        //设置启用内置的缩放控件
        mapView.setBuiltInZoomControls(true);  
        //设置在缩放动画过程中也显示overlay,默认为不绘制
//        mapView.setDrawOverlayWhenZooming(true);
        //设置初始化地图的缩放级别
        mapView.getController().setZoom(16);
        mapView.setClickable(true);
        
        //获取当前位置层
        myLocationOverlay = new MyLocationOverlay(this, mapView);
        //将当前位置的层添加到地图底层中
        mapView.getOverlays().add(myLocationOverlay);
        
        //添加可点选地图获取目的地的层
        addTapOverLay();
        
        //注册定位事件
        locationListener = new LocationListener(){

			@Override
			public void onLocationChanged(Location location) {
				if (location != null){
					//生成GEO类型坐标并在地图上定位到该坐标标示的地点
					 pt = new GeoPoint((int)(location.getLatitude() * 1e6),
							(int)(location.getLongitude() * 1e6));
					 mapView.getController().animateTo(pt);
				}
			}
        };
        
        //初始化搜索模块
        searchModel = new MKSearch();
        //设置路线策略为最短距离
        searchModel.setDrivingPolicy(MKSearch.ECAR_DIS_FIRST);
        searchModel.init(mMapManager, new MKSearchListener() {
			//获取驾车路线回调方法
			@Override
			public void onGetDrivingRouteResult(MKDrivingRouteResult res, int error) {
				// 错误号可参考MKEvent中的定义
				if (error != 0 || res == null) {
					Toast.makeText(NavigationDemoActivity.this, "抱歉，未找到结果", Toast.LENGTH_SHORT).show();
					return;
				}
				RouteOverlay routeOverlay = new RouteOverlay(NavigationDemoActivity.this, mapView);
				
			    // 此处仅展示一个方案作为示例
				MKRoute route = res.getPlan(0).getRoute(0);
				int distanceM = route.getDistance();
				String distanceKm = String.valueOf(distanceM / 1000) +"."+String.valueOf(distanceM % 1000);
				System.out.println("距离:"+distanceKm+"公里---节点数量:"+route.getNumSteps());
				for (int i = 0; i < route.getNumSteps(); i++) {
					MKStep step = route.getStep(i);
					System.out.println("节点信息："+step.getContent());
					System.out.println("经度："+step.getPoint().getLongitudeE6() / 1E6 +" 纬度："+step.getPoint().getLatitudeE6() / 1E6);
				}
			    routeOverlay.setData(route);
			    mapView.getOverlays().clear();
			    mapView.getOverlays().add(routeOverlay);
			    mapView.invalidate();
			    mapView.getController().animateTo(res.getStart().pt);
			}
			
			//以下两种方式和上面的驾车方案实现方法一样
			@Override
			public void onGetWalkingRouteResult(MKWalkingRouteResult res, int error) {
				//获取步行路线
			}
			
			@Override
			public void onGetTransitRouteResult(MKTransitRouteResult arg0, int arg1) {
				//获取公交线路
			}
			
			@Override
			public void onGetBusDetailResult(MKBusLineResult arg0, int arg1) {
			}
			@Override
			public void onGetAddrResult(MKAddrInfo arg0, int arg1) {
			}
			@Override
			public void onGetSuggestionResult(MKSuggestionResult arg0, int arg1) {
			}
			@Override
			public void onGetPoiResult(MKPoiResult arg0, int arg1, int arg2) {
			}
		});
        
        startNaviButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String destination = destinationEditText.getText().toString();
				
				//设置起始地（当前位置）
				MKPlanNode startNode = new MKPlanNode();
				startNode.pt = pt;
				
				//设置目的地
				MKPlanNode endNode = new MKPlanNode(); 
				
				float lat = sharedPreferences.getFloat("lat", 0);
				float lon = sharedPreferences.getFloat("lon", 0);
				
				if (lat != 0 && lon != 0) {
					endNode.pt = new GeoPoint((int)lat,(int)lon);
				}else if (!destination.equals("")) {
					endNode.name = destination;
				}else {
					Toast.makeText(NavigationDemoActivity.this, "请输入或点选目的地",Toast.LENGTH_SHORT).show();
					return;
				}
				
				//展开搜索的城市
				String city = getResources().getString(R.string.beijing);
				searchModel.drivingSearch(city, startNode, city, endNode);
				
				//步行路线
//				searchModel.walkingSearch(city, startNode, city, endNode);
				//公交路线
//				searchModel.transitSearch(city, startNode, endNode);
			}
		});
        
        //清除路线按钮事件
        clearButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				List<Overlay> overlays = mapView.getOverlays();
				
				if (sharedPreferences.getFloat("lon", 0) != 0) {
					//移除顶层的路线图层
					overlays.remove(overlays.size() - 1);
					//添加用户当前位置图层
					overlays.add(myLocationOverlay);
					//地图更新定位到当前位置
					mapView.getController().animateTo(pt);
					
					//清除存储的经纬度信息
					Editor editor = sharedPreferences.edit();
					editor.clear();
					editor.commit();
					
					//添加可点选图层
					addTapOverLay();
					
				}else if (!destinationEditText.getText().toString().equals("")) {
					overlays.remove(overlays.size() - 1);
					overlays.add(myLocationOverlay);
					mapView.getController().animateTo(pt);
					addTapOverLay();
				}else {
					Toast.makeText(NavigationDemoActivity.this, "没有设置路线", Toast.LENGTH_SHORT).show();
				}
			}
		});
    }
    
    public void showIntroduceDialog(){
    	AlertDialog.Builder builder = new AlertDialog.Builder(this);
    	builder.setTitle("使用说明");
    	StringBuilder sb = new StringBuilder();
    	sb.append("1.地图中蓝色点为当前位置；\n\n");
    	sb.append("2.双指捏合或点击缩放按钮可以缩放地图；\n\n");
    	sb.append("3.在输入框中输入目的地或在地图上点选目的地；\n\n");
    	sb.append("4.选取目的地后点击按钮开始导航；\n\n");
    	sb.append("5.点击清除按钮取消本次导航路线；");
    	builder.setMessage(sb.toString());
    	builder.setNegativeButton("确定", null);
    	builder.create().show();
    }
    
    public void addTapOverLay(){
    	//以一副透明图片标示可点选图层，这里在地图上不显示出来，只提供可点选目的地功能
    	GeoPoint gpoint = new GeoPoint((int) (39.914714 * 1E6),	(int) (116.404269 * 1E6));
		OverlayItem overlayitem = new OverlayItem(gpoint, "title", "content");
		Drawable drawale = getResources().getDrawable(R.drawable.current);
		MyItemizedOverlay iconOverlay = new MyItemizedOverlay(NavigationDemoActivity.this,drawale);
		// 添加图层
		iconOverlay.addOverlay(overlayitem);
		mapView.getOverlays().add(iconOverlay);
    }
    
    @Override
	protected void onResume() {
		mMapManager.getLocationManager().requestLocationUpdates(locationListener);
        myLocationOverlay.enableMyLocation();
        myLocationOverlay.enableCompass(); // 打开指南针
		mMapManager.start();
		
		super.onResume();
	}
    
    @Override
	protected void onPause() {
		mMapManager.getLocationManager().removeUpdates(locationListener);
		myLocationOverlay.disableMyLocation();//显示当前位置
		myLocationOverlay.disableCompass(); // 关闭指南针
		mMapManager.stop();
		super.onPause();
	}

	@Override
	protected boolean isRouteDisplayed() {
		// TODO Auto-generated method stub
		return false;
	}
	
	//按物理返回键退出应用时清空存储的经纬度信息
	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
		if (event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
			Editor editor = sharedPreferences.edit();
			editor.clear();
			editor.commit();
		}
		return super.dispatchKeyEvent(event);
	}
	
	// 常用事件监听，用来处理通常的网络错误，授权验证错误等
	class MyGeneralListener implements MKGeneralListener {
			@Override
			public void onGetNetworkState(int iError) {
				Log.d("MyGeneralListener", "onGetNetworkState error is "+ iError);
				Toast.makeText(NavigationDemoActivity.this, "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(NavigationDemoActivity.this, 
							"请在BMapApiDemoApp.java文件输入正确的授权Key！",
							Toast.LENGTH_LONG).show();
				}
			}
		}
}

最后是配置文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ericssonlabs"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>

    <supports-screens android:largeScreens="true"
        android:normalScreens="true" android:smallScreens="true"
        android:resizeable="true" android:anyDensity="true"/>
    <uses-sdk android:minSdkVersion="3"></uses-sdk>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".NavigationDemoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ericssonlabs"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
	<uses-permission android:name="android.permission.INTERNET"></uses-permission>
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>  
	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission> 
	<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
	
	<supports-screens android:largeScreens="true"
	    android:normalScreens="true" android:smallScreens="true"
	    android:resizeable="true" android:anyDensity="true"/>
	<uses-sdk android:minSdkVersion="3"></uses-sdk>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".NavigationDemoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>