Android 百度地图API 定位 导航

           看看这个利用百度地图定位并实现目的地导航的Demo。

首先看实现效果：

                                 

进 入后首先会获得当前位置，在地图上显示出来。在输入框中输入目的地后，就会在地图上出现最佳线路，我这里设置的是距离最小的驾车线路，另外还有公交线路、 步行线路，在代码中都有具体凝视。另外，在控制台还输出了线路上每一个节点的信息以及起始位置和目的地的距离，信息显示的是在当前节点的导航信息。例如如下 图：

       

 

接下来就看怎样实现了，首先。注冊百度开发人员帐号，并进入百度地图API查看相关资料百度地图API，而后就是为需要增长地图的应用注冊APP KEY，注冊完后，下载百度地图jar文件。新建project。并导入就能够。如下看实现具体代码，在代码中有具体凝视：

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public class NavigationDemoActivity  extends MapActivity {       private String mMapKey =  "注冊本身的key" ;       private EditText destinationEditText =  null ;       private Button startNaviButton =  null ;       private MapView mapView =  null ;       private BMapManager mMapManager =  null ;       private MyLocationOverlay myLocationOverlay =  null ;       //onResume时注冊此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;       private MKSearch searchModel;       GeoPoint pt;               @Override       public void onCreate(Bundle savedInstanceState) {           super .onCreate(savedInstanceState);           requestWindowFeature(Window.FEATURE_NO_TITLE);           setContentView(R.layout.main);           destinationEditText = (EditText)  this .findViewById(R.id.et_destination);           startNaviButton = (Button)  this .findViewById(R.id.btn_navi);                       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当中也显示overlay,默以为不绘制  //        mapView.setDrawOverlayWhenZooming(true);           //获取当前位置层           myLocationOverlay =  new MyLocationOverlay( this , mapView);           //将当前位置的层加入到地图底层中           mapView.getOverlays().add(myLocationOverlay);                       // 注冊定位事件           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));  //                  System.out.println("---"+location.getLatitude() +":"+location.getLongitude());                       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) {                   // 错误号可參考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);                                       // 此处仅展现一个方案做为演示样例                   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+ "千米---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());                   }                   routeOverlay.setData(route);                   mapView.getOverlays().clear();                   mapView.getOverlays().add(routeOverlay);                   mapView.invalidate();                   mapView.getController().animateTo(res.getStart().pt);               }                               //下面两种方式和上面的驾车方案实现方法同样               @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();                    endNode.name = destination;                                       //展开搜索的城市                   String city = getResources().getString(R.string.beijing);  //              System.out.println("----"+city+"---"+destination+"---"+pt);                   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);               }           });                   }               @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 ;       }               // 常常使用事件监听，用来处理一般的网络错误，受权验证错误等       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) {                       // 受权Key错误：                       Toast.makeText(NavigationDemoActivity. this ,                                "请在BMapApiDemoApp.java文件输入正确的受权Key！ ",                               Toast.LENGTH_LONG).show();                   }               }           }  }

而后是布局文件：

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<? 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:textSize = "18sp"               android:text = "Destination：" />               < EditText               android:id = "@+id/et_destination"               android:layout_width = "fill_parent"               android:layout_height = "wrap_content" />       </ LinearLayout >               < Button            android:id = "@+id/btn_navi"           android:layout_width = "fill_parent"              android:layout_height = "wrap_content"              android:text = "Start navigate" />           < com.baidu.mapapi.MapView           android:id = "@+id/bmapsView"           android:layout_width = "fill_parent"           android:layout_height = "fill_parent"           android:clickable = "true" />      </ LinearLayout >

AndroidMainifest.xml：

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<? 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 >