前言:

 

下面讲述在MapView中显示当前位置,并同时已知的银行ATM机的位置

 

 

 

 

 

效果图:

 

 

 

 

 

1         实现效果说明:

 

实现显示当前位置和银行ATM机的位置,主要分以下两个步骤,

 

1)       根据位置服务找到当前的GPS坐标

 

 

2)       将当前坐标和ATM坐标,用图层的方式显示到地图上

 

 

 

2         根据位置服务找到当前的GPS坐标

 

l  设置应用的权限

 

在AndroidManifest.xml文件中设置ACCESS_FINE_LOCATION权限

 

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

 

 

 

• 获取 定位服务

 

String context=Context.LOCATION_SERVICE;

 

locationManager=(LocationManager)getSystemService(context);

 

 

 

•   根据定位服务获取位置

 

定位服务接口

 

[1]  LocationManager.getLastKnownLocation(provider)

 

注:获取最后一次定位坐标信息

 

 

 

[2] void android.location.LocationManager.requestLocationUpdates(String provider, long minTime, float minDistance, LocationListener listener)

 

注:对指定provider进行侦听,条件为 最小时间minTime ,最小距离minDistance

 

 

 

3         根据位置服务找到当前的GPS坐标

 

• 添加MyLocationOverlay层,显示当前位置.

 

List<Overlay> overlays=map_view.getOverlays(); // set location Overlay

 

       MyLocationOverlay mylocationOver=new MyLocationOverlay(this,map_view);

 

        overlays.add(mylocationOver);

 

        mylocationOver.enableCompass(); //显示指南针

 

    mylocationOver.enableMyLocation(); //允许当前位置

 

 

 

• 自定义层，显示ATM位置

 

集成ItemizedOverlay<OverlayItem>类

 

调用方式：

 

atm=new ATMDynamicItemizedOverlay(this.getResources().getDrawable(R.drawable.map_atm));

 

    overlays.add(atm);

 

    atm.addNewItem(new GeoPoint(lat.intValue()+1000,lng.intValue()), "marketText", "snippet");

 

 

 

4         源代码：

 

自定义 ATMDynamicItemizedOverlay 类

 

publicclass ATMDynamicItemizedOverlay extends ItemizedOverlay
      
       {
     private ArrayList
       
         items ; public ATMDynamicItemizedOverlay(Drawable defaultMarker)     {
     super(boundCenterBottom(defaultMarker));         items=new ArrayList
        
         ();         populate();     } publicvoid addNewItem(GeoPoint location,String marketText,String snippet)     {
             items.add(new OverlayItem(location,marketText,snippet));         populate();     } publicvoid removeItem(int index)     {
             items.remove(index);         populate();     }     @Override protected OverlayItem createItem(int index) {
     // TODO Auto-generated method stub         return items.get(index);     }     @Override publicint size() {
     // TODO Auto-generated method stub return items.size();     } }
        
       
      

 

 

 窗体文件

 

publicclass LocationMap extends MapActivity {
         LocationManager locationManager;     MapView map_view;     ATMDynamicItemizedOverlay atm;      @Override   publicvoid onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);           setContentView(R.layout.locationmap); //add bank button onclick event          ImageView imgView_back=(ImageView)findViewById(R.id.map_imgView_back);          imgView_back.setOnClickListener(new  ImageView.OnClickListener()         {
     publicvoid onClick(View v){
                     ViewUtility.NavigateActivate(LocationMap.this,Main.class );                }         }); //set MapControl         map_view =(MapView)findViewById(R.id.map_view);         map_view.setStreetView(true);         map_view.setTraffic(true);         map_view.setBuiltInZoomControls(false);         map_view.setSatellite(false);          List
      
        overlays=map_view.getOverlays(); // set location Overlay         MyLocationOverlay mylocationOver=new MyLocationOverlay(this,map_view);         overlays.add(mylocationOver);         mylocationOver.enableCompass();         mylocationOver.enableMyLocation(); //set atm Overlay         atm=new ATMDynamicItemizedOverlay(this.getResources().getDrawable(R.drawable.map_atm));         overlays.add(atm);         String context=Context.LOCATION_SERVICE;         locationManager=(LocationManager)getSystemService(context);         String provider=LocationManager.GPS_PROVIDER; //OverlayItem a=new OverlayItem(null, provider, provider;         Location location =locationManager.getLastKnownLocation(provider); if(location!=null)         {
                 UpdateMapView(location);         }         locationManager.requestLocationUpdates(provider, 10000, 5, locationListener );      } /* By new location ,update MapWiew's Label */ privatevoid UpdateMapView(Location location)      {
                MapController mapcontroller=map_view.getController();             Double lat=location.getLatitude()*1E6;             Double lng=location.getLongitude()*1E6;             GeoPoint point=new GeoPoint(lat.intValue(),lng.intValue());             mapcontroller.setCenter(point);             mapcontroller.setZoom(20);             mapcontroller.animateTo(point);             atm.addNewItem(new GeoPoint(lat.intValue()+1000,lng.intValue()), "marketText", "snippet");             Toast.makeText(this, "lat:"+ String.valueOf(lat.intValue())+"lng:"+String.valueOf(lng.intValue()), Toast.LENGTH_SHORT).show();      }      @Override publicboolean onKeyDown(int keyCode, KeyEvent event) {
     if(keyCode == KeyEvent.KEYCODE_BACK){
                     ViewUtility.NavigateActivate(LocationMap.this, Main.class);             } returnfalse;         }     @Override protectedboolean isRouteDisplayed() {
     // TODO Auto-generated method stub returnfalse;     } //create location listener private LocationListener locationListener =new LocationListener(){
     //location is changed             @Override publicvoid onLocationChanged(Location location) {
                     UpdateMapView(location);                  Log.d("Location", "onLocationChanged");              } //location is Disable        @Override publicvoid onProviderDisabled(String provider) {
                    Log.d("Location", "onProviderDisabled");              } //location is enabled              @Override publicvoid onProviderEnabled(String provider) {
                 Log.d("Location", "onProviderEnabled");              } //location's status changes              @Override publicvoid onStatusChanged(String provider, int status, Bundle extras) {
                     Log.d("Location", "onStatusChanged");              }      }; }