定位用户当前位置并在Google地图中显示
我正在开发一个包含3个活动的android应用程序，其中一个是map。 我正在使用谷歌地图
我想要的是：
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当用户打开活动（地图）时，它向用户显示她的位置而不是坐标。
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用户还应该能够通过使用引脚来定位（打孔）任何地方，我的应用程序必须将此引脚的坐标存储在变量中，以便我以后可以使用它。
public class LActivity extends MapActivity { /** Called when the activity is first created. */ MapView mapView; GeoPoint geo; MapController mapController; LocationManager locationManager; CustomPinpoint itemizedoverlay; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.main); mapView = (MapView) findViewById(R.id.mapView); // create a map view //LinearLayout linearLayout = (LinearLayout) findViewById(R.id.main); mapView.setBuiltInZoomControls(true); // Either satellite or 2d mapView.setSatellite(true); mapController = mapView.getController(); mapController.setZoom(14); // Zoon 1 is world view locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new GeoUpdateHandler()); Drawable drawable = this.getResources().getDrawable(R.drawable.point); itemizedoverlay = new CustomPinpoint(drawable); createMarker(); } public class GeoUpdateHandler implements LocationListener { @Override public void onLocationChanged(Location location) { int lat = (int) (location.getLatitude() * 1E6); int lng = (int) (location.getLongitude() * 1E6); GeoPoint point = new GeoPoint(lat, lng); createMarker(); mapController.animateTo(point); // mapController.setCenter(point); } @Override public void onProviderDisabled(String provider) { } @Override public void onProviderEnabled(String provider) { } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } } private void createMarker() { GeoPoint p = mapView.getMapCenter(); OverlayItem overlayitem = new OverlayItem(p, "", ""); itemizedoverlay.addOverlay(overlayitem); mapView.getOverlays().add(itemizedoverlay); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } } 这是CustomPinpoint类
public class CustomPinpoint extends ItemizedOverlay { static int maxNum = 3; OverlayItem overlays[] = new OverlayItem[maxNum]; int index = 0; boolean full = false; CustomPinpoint itemizedoverlay; public CustomPinpoint(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); } @Override protected OverlayItem createItem(int i) { return overlays[i]; } @Override public int size() { if (full) { return overlays.length; } else { return index; } } public void addOverlay(OverlayItem overlay) { if (index < maxNum) { overlays[index] = overlay; } else { index = 0; full = true; overlays[index] = overlay; } index++; populate(); } }
我已经实现了你想要的相同的东西。 我正在为您提供示例代码。 在这里，我还在获取位置时实现了ProgressDialog。
这是获取位置的起点。 我将此命名为AndroidLocationActivity。 这是您的应用启动时开始的第一个活动。
String provider; public double latitude, longitude = 0; CurrentPositionTask getCurrentLocation; Location currentLocation; LocationListener locationListener; LocationManager locationManager; private long time=0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); try { locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); setCriteria(); currentLocation = AndroidLocationActivity.this.locationManager.getLastKnownLocation(provider); if (currentLocation == null) { currentLocation = new Location(provider); } time = currentLocation.getTime(); if (latitude == 0 && longitude == 0) { latitude = currentLocation.getLatitude(); longitude = currentLocation.getLongitude(); } Toast.makeText(AndroidLocationActivity.this, String.valueOf(time), Toast.LENGTH_LONG).show();
如果时间不超过1分钟，则设置时间，而不是更新位置。
if (time >= 100000) { latitude = 0; longitude = 0; } } catch (NullPointerException e) { // TODO: handle exception System.out.println("Null"); e.printStackTrace(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } runAsyncTask(); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); locationManager.removeUpdates(locationListener); } public void setCriteria() { Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_MEDIUM); provider = locationManager.getBestProvider(criteria, true); Toast.makeText(getApplicationContext(), "Provider - " + provider, Toast.LENGTH_SHORT).show(); if (provider == null) { provider = LocationManager.GPS_PROVIDER; } } public void runAsyncTask() { // TODO Auto-generated method stub if (getCurrentLocation == null) { getCurrentLocation = new CurrentPositionTask(); } if (getCurrentLocation != null) { getCurrentLocation.execute("Searching for Location"); } } public boolean checkConnection() { //ARE WE CONNECTED TO THE NET ConnectivityManager conMgr = (ConnectivityManager) getSystemService (AndroidLocationActivity.CONNECTIVITY_SERVICE); if (conMgr.getActiveNetworkInfo() != null && conMgr.getActiveNetworkInfo().isAvailable()&& conMgr.getActiveNetworkInfo().isConnected()) { return true; } else { return false; } } private class CurrentPositionTask extends AsyncTask { private ProgressDialog Dialog = new ProgressDialog(AndroidLocationActivity.this); private boolean flag = true; public CurrentPositionTask() { locationListener = new MyLocationListener(); } @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); try { if (checkConnection()) { Dialog.setTitle("Loading"); Dialog.setMessage("Searching for Location"); Dialog.show(); locationManager.requestLocationUpdates(provider, 0, 0, locationListener); } else { Toast.makeText(getApplicationContext(), "Internet is Not Available", Toast.LENGTH_LONG).show(); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } @Override protected Void doInBackground(String... params) { // TODO Auto-generated method stub while (flag) { if (latitude !=0 && longitude != 0) { flag=false; } } return null; } @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub Toast.makeText(AndroidLocationActivity.this, "Location Floats:- " + latitude + "," + longitude, Toast.LENGTH_LONG).show(); super.onPostExecute(result); if (Dialog != null && Dialog.isShowing()) { Dialog.dismiss(); time=0; Intent homeIntent = new Intent(AndroidLocationActivity.this.getApplicationContext(), HomeMenuActivity.class);
在这里设置lat＆lng并开始新的活动
homeIntent.putExtra("lat", latitude); homeIntent.putExtra("lng", longitude); startActivity(homeIntent); } locationManager.removeUpdates(locationListener); } } class MyLocationListener implements LocationListener { @Override public void onLocationChanged(Location location) { // TODO Auto-generated method stub if (location != null) { latitude = location.getLatitude(); longitude = location.getLongitude(); } } @Override public void onProviderDisabled(String arg0) { // TODO Auto-generated method stub Toast.makeText( getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT).show(); } @Override public void onProviderEnabled(String arg0) { // TODO Auto-generated method stub Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show(); } @Override public void onStatusChanged(String arg0, int arg1, Bundle arg2) { // TODO Auto-generated method stub } }
这是我显示地图的function。 这是HomeMenuActivity
public static Context context; onCreate(..) { context = getApplicationContext(); // it will be used in Itemized Overlay latitude = getIntent().getDoubleExtra("lat", 0);//get the lat & lng longitude = getIntent().getDoubleExtra("lng", 0); } public void showMap() { // TODO Auto-generated method stub try { geoPoint = new GeoPoint((int)(latitude * 1E6),(int)(longitude * 1E6)); mapview = (MapView)findViewById(R.id.mapview); mapControll= mapview.getController(); mapview.setBuiltInZoomControls(true); mapview.setStreetView(true); mapview.setTraffic(true); mapControll.setZoom(16); mapControll.animateTo(geoPoint); userPic = this.getResources().getDrawable(your pic....); userPicOverlay = new MyItemizedOverlay(userPic); OverlayItem overlayItem = new OverlayItem(geoPoint, "", null); userPicOverlay.addOverlay(overlayItem); mapview.getOverlays().add(userPicOverlay); //Added symbols will be displayed when map is redrawn so force redraw now mapview.postInvalidate(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } }
ItemizedOverlay类
public class MyItemizedOverlay extends ItemizedOverlay { private ArrayList myOverlays ; public MyItemizedOverlay(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); myOverlays = new ArrayList (); populate(); } public void addOverlay(OverlayItem overlay){ myOverlays.add(overlay); populate(); } @Override protected OverlayItem createItem(int i) { return myOverlays.get(i); } // Removes overlay item i public void removeItem(int i){ myOverlays.remove(i); populate(); } // Returns present number of items in list @Override public int size() { return myOverlays.size(); } public void addOverlayItem(OverlayItem overlayItem) { myOverlays.add(overlayItem); populate(); } public void addOverlayItem(int lat, int lon, String title) { try { GeoPoint point = new GeoPoint(lat, lon); OverlayItem overlayItem = new OverlayItem(point, title, null); addOverlayItem(overlayItem); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } @Override protected boolean onTap(int index) { // TODO Auto-generated method stub String title = myOverlays.get(index).getTitle(); Toast.makeText(HomeMenuActivity.context, title, Toast.LENGTH_LONG).show(); return super.onTap(index); } }
希望这会有所帮助…..
删除onCreate上的方法并添加以下代码：
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map); initMap(); // This is the method which initialize the map locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new GeoUpdateHandler()); Drawable drawable = this.getResources().getDrawable(R.drawable.point); itemizedoverlay = new CustomPinpoint(drawable); createMarker(); } @Override public void onResume() { super.onResume(); try { initMyLocation(); }catch(Exception e){} } /** * Inits the map. */ protected void initMap() { mapView = (MyMapView) findViewById(R.id.mapView); mapView.setBuiltInZoomControls(true); mapView.setSatellite(true); mapView.setStreetView(false); mapController = mapView.getController(); mapOverlay = new MapOverlay(); List overlays = mapView.getOverlays(); overlays.add(mapOverlay); mapController.setZoom(14); mapView.invalidate(); } /** * Initialises the MyLocationOverlay and adds it to the overlays of the map. */ public void initMyLocation() { try { LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); Location l = LocationService.getLastKnownLocation(lm); int lat = (int)(l.getLatitude()*1E6); int lng = (int)(l.getLongitude()*1E6); mapController.setCenter(new GeoPoint(lat , lng)); myLocOverlay = new MyLocationOverlay(this, mapView); myLocOverlay.enableMyLocation(); mapView.getOverlays().add(myLocOverlay); mapController.setCenter(myLocOverlay.getMyLocation()); }catch(NullPointerException e){} findMe(); } /** * This method will animate to my current position */ public void findMe() { try { mapController.animateTo(myLocOverlay.getMyLocation()); }catch(NullPointerException e){} }
然后，为了存储Overlays以供将来使用，您可以使用SharedPreferences或SQLite 。 每个都有很多教程。