(android 地图实战开发)3 在地图上显示当前位置和自定义银行位置 ...

(android 地图实战开发)3 在地图上显示当前位置和自定义银行位置 ...

2011-9-21 09:05|发布者: benben|查看: 787|评论: 0

摘要: Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 ...

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   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, longminTime, float minDistance, LocationListenerlistener) 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 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 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 View Code public class ATMDynamicItemizedOverlay extends ItemizedOverlay<OverlayItem>{ private ArrayList<OverlayItem> items ; public ATMDynamicItemizedOverlay(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); items=new ArrayList<OverlayItem>(); populate(); } public void addNewItem(GeoPoint location,String marketText,String snippet) { items.add(new OverlayItem(location,marketText,snippet)); populate(); } public void removeItem(int index) { items.remove(index); populate(); } @Override protected OverlayItem createItem(int index) { // TODO Auto-generated method stub return items.get(index); } @Override public int size() { // TODO Auto-generated method stub return items.size(); } }  窗体文件 View Code public class LocationMap extends MapActivity { LocationManager locationManager; MapView map_view; ATMDynamicItemizedOverlay atm; @Override public void 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() { public void 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<Overlay> 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 */ private void 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 public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){ ViewUtility.NavigateActivate(LocationMap.this, Main.class); } return false; } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } //create location listener private LocationListener locationListener = new LocationListener(){ //location is changed @Override public void onLocationChanged(Location location) { UpdateMapView(location); Log.d("Location", "onLocationChanged"); } //location is Disable @Override public void onProviderDisabled(String provider) { Log.d("Location", "onProviderDisabled"); } //location is enabled @Override public void onProviderEnabled(String provider) { Log.d("Location", "onProviderEnabled"); } //location's status changes @Override public void onStatusChanged(String provider, int status, Bundle extras) { Log.d("Location", "onStatusChanged"); } }; }