我想创建一个显示地图的Activity。当我点击按钮时，我将LatLng点保存到列表中。所以我走在街上，当我走路的时候，我点击按钮，我想在地图上显示我的路线。所以我尝试编写这段代码，但没找到：
public void settaMappa(View view){
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
//Got the location!
System.out.println("ho avuto un segnale gps valido ");
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map2)).getMap();
if(listaPuntiTerreno == null)
listaPuntiTerreno = new ArrayList<LatLng>();
if (location != null)
{
LatLng latLong = new LatLng(location.getLatitude(), location.getLongitude());
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLong, 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
.zoom(17) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
listaPuntiTerreno.add(latLong);
disegnaTracciato();
}
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(this, locationResult);
}
public void disegnaTracciato(){
if(listaPuntiTerreno !=null &&
listaPuntiTerreno.size()>1){
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map2)).getMap();
PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
for (int z = 0; z < listaPuntiTerreno.size(); z++) {
LatLng point = listaPuntiTerreno.get(z);
options.add(point);
}
Polyline line = mMap.addPolyline(options);
}
}
我们可以帮助我吗？
最佳制度
答案 0 :(得分：1)
我已解决了我的问题，代码是这样的：
public MyLocation myLocation;
/**
* il metodo consente di registrare il punto
*/
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
//Got the location!
System.out.println("ho avuto un segnale gps valido ");
if (location != null)
{
LatLng latLong = new LatLng(location.getMyLocation().getLatitude(),
location.getMyLocation().getLongitude());
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLong, 25));
listaPuntiTerreno.add(latLong);
Toast toast = Toast.makeText(getApplicationContext(), "Punto registrato correttamente", Toast.LENGTH_SHORT);
toast.show();
disegnaTracciato();
}
}
};
当我点击按钮时，我会调用此方法：
public void registraPunto(View view){
myLocation.getLocation(this, locationResult);
}
这是一个MyLocation类（我从另一个帖子复制了这个类）
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
private ProgressDialog pDialog;
private final static int LOCALIZATION_DELAY = 10000;
public boolean getLocation(Context context, LocationResult result)
{
//I use LocationResult callback class to pass location value from MyLocation to user code.
locationResult=result;
if(lm==null)
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//exceptions will be thrown if provider is not permitted.
try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}
//don't start listeners if no provider is enabled
if(!gps_enabled && !network_enabled)
return false;
if(gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
if(network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
pDialog = ProgressDialog.show(context, "Attendere ...", "Localizzazione in corso ...", true);
pDialog.setCancelable(false);
timer1=new Timer();
timer1.schedule(new GetLastLocation(), LOCALIZATION_DELAY);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
if(pDialog.isShowing())
pDialog.dismiss();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
if(pDialog.isShowing())
pDialog.dismiss();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
class GetLastLocation extends TimerTask {
@Override
public void run() {
if(pDialog.isShowing())
pDialog.dismiss();
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc=null, gps_loc=null;
if(gps_enabled)
gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(network_enabled)
net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//if there are both values use the latest one
if(gps_loc!=null && net_loc!=null){
if(gps_loc.getTime()>net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if(gps_loc!=null){
locationResult.gotLocation(gps_loc);
return;
}
if(net_loc!=null){
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult{
public abstract void gotLocation(Location location);
}
}
现在，当我尝试单击按钮时，我从MyLocation类获得了一个位置，但经度和纬度是错误的。如果我在maps.google.it上插入此号码，我会看到我的真实位置是错误的，如果我从mMap对象获得经度和纬度，这些都是正确的。
我的错误在哪里？ 我们可以帮助我吗？