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Comment dessiner un chemin à mesure que je me déplace à partir de ma position actuelle à l'aide de Google Maps

J'essaie de tracer une route lorsque je quitte ma position actuelle. Je suis confronté à un gros problème pour tracer une route de manière dynamique, aidez-moi à le résoudre. J'ai un marqueur à ma position actuelle sur ma carte. Dès que je commence à me déplacer, je souhaite que la carte commence à tracer des lignes dans le chemin que je déplace. Je n'ai pas deux points fixes. Quelqu'un peut-il me donner une solution pour surmonter cela. J'ai vu beaucoup de réponses dans SO qui trace le chemin entre deux points fixes. Mais ici, seul mon point de départ est corrigé. Je peux obtenir ma position actuelle dans mon application pour le moment. J'ai essayé avec le code suivant mais getLocationManager () provoque une erreur. J'utilise Android Studio. 

Code mis à jour:

Mon activité:

import Android.content.Context;
import Android.content.SharedPreferences;
import Android.location.Address;
import Android.location.Geocoder;
import Android.location.Location;
import Android.os.Bundle;
import Android.support.v4.app.FragmentActivity;
import Android.util.Log;
import Android.util.Xml;
import Android.widget.TextView;
import Android.widget.Toast;

import com.google.Android.gms.common.ConnectionResult;
import com.google.Android.gms.common.GooglePlayServicesUtil;
import com.google.Android.gms.common.api.GoogleApiClient;
import com.google.Android.gms.common.api.PendingResult;
import com.google.Android.gms.common.api.Status;
import com.google.Android.gms.location.LocationListener;
import com.google.Android.gms.location.LocationRequest;
import com.google.Android.gms.location.LocationServices;
import com.google.Android.gms.maps.CameraUpdateFactory;
import com.google.Android.gms.maps.GoogleMap;
import com.google.Android.gms.maps.SupportMapFragment;
import com.google.Android.gms.maps.model.BitmapDescriptorFactory;
import com.google.Android.gms.maps.model.LatLng;
import com.google.Android.gms.maps.model.Marker;
import com.google.Android.gms.maps.model.MarkerOptions;
import com.google.maps.Android.ui.IconGenerator;

import org.xmlpull.v1.XmlSerializer;

import Java.io.FileNotFoundException;
import Java.io.FileOutputStream;
import Java.io.IOException;
import Java.io.StringWriter;
import Java.text.DateFormat;
import Java.util.Calendar;
import Java.util.Date;
import Java.util.List;
import Java.util.Locale;

public class MainActivity extends FragmentActivity implements
        LocationListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    private static final String TAG = "MainActivity";
    private static final long INTERVAL = 1000 * 60 * 1; //1 minute
    private static final long FASTEST_INTERVAL = 1000 * 60 * 1; // 1 minute
    private LocationRequest mLocationRequest;
    private GoogleApiClient mGoogleApiClient;
    private Location mCurrentLocation;
    private String mLastUpdateTime;
    private String city = "";
    private String country = "";
    private String area = "";
    private String title;
    private String requiredArea = "";
    private GoogleMap googleMap;
    private List<Address> addresses;


    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate ...............................");
        //show error dialog if GoolglePlayServices not available
        if (!isGooglePlayServicesAvailable()) {

            Toast.makeText(this, "Google Play Services is not available", Toast.LENGTH_LONG).show();

            finish();
        }
        createLocationRequest();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

        setContentView(R.layout.activity_main);
        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);

        googleMap = fm.getMap();
        googleMap.setMyLocationEnabled(true);
        googleMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() {
            @Override
            public boolean onMyLocationButtonClick() {

                Toast.makeText(getApplicationContext(), "Location button has been clicked", Toast.LENGTH_LONG).show();
                return true;
            }
        });
        googleMap.getUiSettings().setZoomControlsEnabled(true);
        googleMap.getUiSettings().setAllGesturesEnabled(true);


    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(TAG, "onStart fired ..............");
        mGoogleApiClient.connect();
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d(TAG, "onStop fired ..............");
        mGoogleApiClient.disconnect();
        Log.d(TAG, "isConnected ...............: " + mGoogleApiClient.isConnected());
    }

    private boolean isGooglePlayServicesAvailable() {
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (ConnectionResult.SUCCESS == status) {
            return true;
        } else {
            GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
            Toast.makeText(getApplicationContext(), "Google Play Services is not Available", Toast.LENGTH_LONG).show();
            return false;
        }
    }

    @Override
    public void onConnected(Bundle bundle) {
        Log.d(TAG, "onConnected - isConnected ...............: " + mGoogleApiClient.isConnected());
        startLocationUpdates();
    }

    protected void startLocationUpdates() {
        PendingResult<Status> pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, this);
        Log.d(TAG, "Location update started ..............: ");
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.d(TAG, "Connection failed: " + connectionResult.toString());
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.d(TAG, "Firing onLocationChanged..............................................");
        mCurrentLocation = location;
        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
        addMarker();
        float accuracy = location.getAccuracy();
        Log.d("iFocus", "The amount of accuracy is " + accuracy);
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        Bundle extras = location.getExtras();
        Boolean has = location.hasAccuracy();
        String provider = location.getProvider();
        Long time = location.getTime();

//        Location locationB = new Location("Begur");
//        double lati = 12.8723;
//        double longi =  77.6329;
//        locationB.setLatitude(lati);
//        locationB.setLongitude(longi);
//        Float distance = location.distanceTo(locationB);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(time);

        int mYear = calendar.get(Calendar.YEAR);
        int mMonth = calendar.get(Calendar.MONTH) + 1;
        int mDay = calendar.get(Calendar.DAY_OF_MONTH);

        String formattedTime = mDay + ":" + mMonth + ":" + mYear;
        Log.d("iFocus", "The name of provider is " + provider);
        Log.d("iFocus", "The value of has is " + has);
        Log.d("iFocus", "The value of extras is " + extras);
        Log.d("iFocus", "The value of Month is " + mMonth);
        Log.d("iFocus", "The value of Day is " + mDay);
        Log.d("iFocus", "The value of Year is " + mYear);
        Log.d("iFocus", "The value of Time is " + formattedTime);
        //Log.d("iFocus", "The value of distance is "+distance);

        LatLng latLng = new LatLng(latitude, longitude);

        Geocoder geocoder = new Geocoder(this, Locale.getDefault());

        try {
            addresses = geocoder.getFromLocation(latitude, longitude, 1);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String cityName = addresses.get(0).getAddressLine(0);
        String stateName = addresses.get(0).getAddressLine(1);
        String countryName = addresses.get(0).getAddressLine(2);

        String[] splittedStateName = stateName.split(",");
        requiredArea = splittedStateName[2];
        Log.d("iFocus", "The value of required area is " + requiredArea);

        city = addresses.get(0).getLocality();
        area = addresses.get(0).getSubLocality();
        String adminArea = addresses.get(0).getAdminArea();
        String premises = addresses.get(0).getPremises();
        String subAdminArea = addresses.get(0).getSubAdminArea();
        String featureName = addresses.get(0).getFeatureName();
        String phone = addresses.get(0).getPhone();
        country = addresses.get(0).getCountryName();
        Log.d("iFocus", "The name of city is " + city);
        Log.d("iFocus", "The name of area is " + area);
        Log.d("iFocus", "The name of country is " + country);
        Log.d("iFocus", "The value of cityName is " + cityName);
        Log.d("iFocus", "The value of StateName is " + stateName);
        Log.d("iFocus", "The value of CountryName is " + countryName);

        Toast.makeText(this, cityName + " " + stateName + " " + countryName, Toast.LENGTH_LONG).show();

        SharedPreferences sharedPreferences = getSharedPreferences("MyValues", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("CITY", cityName);
        editor.putString("STATE", stateName);
        editor.putString("COUNTRY", countryName);
        editor.commit();

        TextView mapTitle = (TextView) findViewById(R.id.textViewTitle);

        if (requiredArea != "" && city != "" && country != "") {
            title = mLastUpdateTime.concat(", " + requiredArea).concat(", " + city).concat(", " + country);
        }
        else {
            title = mLastUpdateTime.concat(", " + area).concat(", " + city).concat(", " + country);
        }
        mapTitle.setText(title);
        addMarker();// newly added

        final String xmlFile = "userData.xml";

        try {
            // FileOutputStream fos = new  FileOutputStream("userData.xml");
            FileOutputStream fos = openFileOutput(xmlFile, Context.MODE_PRIVATE);
            XmlSerializer xmlSerializer = Xml.newSerializer();
            StringWriter writer = new StringWriter();
            xmlSerializer.setOutput(writer);
            xmlSerializer.startDocument("UTF-8", true);
            xmlSerializer.startTag(null, "userData");
            xmlSerializer.startTag(null, "Time");
            xmlSerializer.text(mLastUpdateTime);
            xmlSerializer.endTag(null, "Time");
            xmlSerializer.startTag(null, "Area");
            if (requiredArea != "") {
                xmlSerializer.text(requiredArea);
            }
            else {
                xmlSerializer.text(area);
            }
            xmlSerializer.endTag(null, "Area");
            xmlSerializer.startTag(null, "City");
            xmlSerializer.text(city);
            xmlSerializer.endTag(null, "City");
            xmlSerializer.endTag(null, "userData");
            xmlSerializer.endDocument();
            xmlSerializer.flush();
            String dataWrite = writer.toString();
            fos.write(dataWrite.getBytes());
            fos.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String dir = getFilesDir().getAbsolutePath();
        Log.d("Pana", "The value of Dir is "+dir);

    }

    private void addMarker() {
        MarkerOptions options = new MarkerOptions();

        // following four lines requires 'Google Maps Android API Utility Library'
        // https://developers.google.com/maps/documentation/Android/utility/
        // I have used this to display the time as title for location markers
        // you can safely comment the following four lines but for this info
        IconGenerator iconFactory = new IconGenerator(this);
        iconFactory.setStyle(IconGenerator.STYLE_PURPLE);
        // options.icon(BitmapDescriptorFactory.fromBitmap(iconFactory.makeIcon(mLastUpdateTime + requiredArea + city)));
        options.icon(BitmapDescriptorFactory.fromBitmap(iconFactory.makeIcon(requiredArea + ", " + city)));
        options.anchor(iconFactory.getAnchorU(), iconFactory.getAnchorV());
        LatLng currentLatLng = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
        options.position(currentLatLng);
        Marker mapMarker = googleMap.addMarker(options);
        long atTime = mCurrentLocation.getTime();
        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date(atTime));
        String title = mLastUpdateTime.concat(", " + requiredArea).concat(", " + city).concat(", " + country);
        mapMarker.setTitle(title);


        TextView mapTitle = (TextView) findViewById(R.id.textViewTitle);
        mapTitle.setText(title);

        Log.d(TAG, "Marker added.............................");
        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng,
                13));
        Log.d(TAG, "Zoom done.............................");
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopLocationUpdates();
    }

    protected void stopLocationUpdates() {
        LocationServices.FusedLocationApi.removeLocationUpdates(
                mGoogleApiClient, this);
        Log.d(TAG, "Location update stopped .......................");
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mGoogleApiClient.isConnected()) {
            startLocationUpdates();
            Log.d(TAG, "Location update resumed .....................");
        }
    }
}

J'essaie d'ajouter cette méthode dans mon code pour tracer une ligne, mais cela donne une erreur dans getLocationManager ();

       private void addLocationListener(LocationListener locationListener) {
        LocationProvider locationProvider = getLocationManager().getProvider(LocationManager.GPS_PROVIDER);

        getLocationManager().requestLocationUpdates(locationProvider.getName(), LOCATION_UPDATE_INTERVAL,
                LOCATION_UPDATE_MIN_DISTANCE, locationListener);
    }

    private LocationManager getLocationManager() {
        return (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    }

    private void startGpsListening(Location start) {
       this.startLocation = start;
       addLocationListener(new MyLocationListener());
    }

    private Location startLocation = new Location("");

    private class MyLocationListener extends LocationListener {

        public void onLocationChanged(Location location) {

        }
        ...
    }
androidgoogle-mapsgeolocationlocationlocationlistener
15
Keshav1234

Il semble que la meilleure implémentation serait simplement d’utiliser un ArrayList<LatLng> pour stocker chaque point donné dans onLocationChanged(). Ensuite, chaque fois que vous obtenez un nouveau point, redessinez la ligne.

Commencez par importer ce dont vous avez besoin pour dessiner les lignes:

import com.google.Android.gms.maps.model.Polyline;
import com.google.Android.gms.maps.model.PolylineOptions;

Créez des variables de membre pour ArrayList et la polyligne:

private ArrayList<LatLng> points; //added
Polyline line; //added

Initialiser points dans onCreate():

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    points = new ArrayList<LatLng>(); //added
    //...............

Ensuite, dans onLocationChanged(), ajoutez chaque point que vous obtenez à la liste de tableaux:

@Override
public void onLocationChanged(Location location) {
      double latitude = location.getLatitude();
      double longitude = location.getLongitude();
      LatLng latLng = new LatLng(latitude, longitude); //you already have this

      points.add(latLng); //added

      redrawLine(); //added

}

En prenant cette réponse , définissez votre méthode redrawLine().
Supprimez tous les autres appels de addMarker(), puisque vous appelez clear() sur votre carte, ce qui supprime tous les marqueurs et polylignes.

private void redrawLine(){

    googleMap.clear();  //clears all Markers and Polylines

    PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
    for (int i = 0; i < points.size(); i++) {
        LatLng point = points.get(i);
        options.add(point);
    }
    addMarker(); //add Marker in current position
    line = googleMap.addPolyline(options); //add Polyline
}

Modifier: vous voudrez probablement aussi indiquer la distance minimale en mètres entre les rappels d’emplacement modifié.

private static final String TAG = "MainActivity";
private static final long INTERVAL = 1000 * 60 * 1; //1 minute
private static final long FASTEST_INTERVAL = 1000 * 60 * 1; // 1 minute
private static final float SMALLEST_DISPLACEMENT = 0.25F; //quarter of a meter

Appelez setSmallestDisplacement():

protected void createLocationRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(INTERVAL);
    mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
    mLocationRequest.setSmallestDisplacement(SMALLEST_DISPLACEMENT); //added
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}

Cela devrait être suffisant pour vous aider à démarrer. Vous devrez peut-être ajuster avec précision la fréquence des rappels de localisation modifiés pour obtenir le résultat souhaité. Il y a probablement plus que cela, mais vous pouvez trouver les cas Edge et les résoudre après les tests.

28
Daniel Nugent

Je sais qu'il est assez tard pour une réponse, mais je posterai ceci ici pour ceux qui ont toujours le même problème.

Si vous souhaitez déplacer un marqueur et/ou une polyligne, vous n'avez pas besoin de supprimer/effacer et de dessiner à nouveau. Vous devez plutôt ajouter PolylineOptions une fois, puis définir les nouveaux points ensuite.

Exemple de code:

boolean isPolyAdded = false;

Ajoutez cette ligne du code:

if (isPolyLoaded == false){
        polyline = map.addPolyline(lineOptions);
        isPolyLoaded = true;
    }else{
        polyline.setPoints(points);
    }

à la et de la méthode onPostExecute 

Code final: 

 @Override
    protected void onPostExecute(List<List<HashMap<String, String>>> result) {

        // Traversing through all the routes
        for(int i=0;i<result.size();i++){
            points = new ArrayList<LatLng>();
            lineOptions = new PolylineOptions();

            // Fetching i-th route
            List<HashMap<String, String>> path = result.get(i);

            // Fetching all the points in i-th route
            for(int j=0;j<path.size();j++){
                HashMap<String,String> point = path.get(j);

                double lat = Double.parseDouble(point.get("lat"));
                double lng = Double.parseDouble(point.get("lng"));
                LatLng position = new LatLng(lat, lng);

                points.add(position);
            }

            // Adding all the points in the route to LineOptions
            lineOptions.addAll(points);
            lineOptions.width(7);
            lineOptions.color(Color.BLACK);
        }

        // Drawing polyline in the Google Map for the i-th route

        if (isPolyLoaded == false){
            polyline = map.addPolyline(lineOptions);
            isPolyLoaded = true;
        }else{
            polyline.setPoints(points);
        }

    }
}
2
Soheil Nikbin

Son très simple pour dessiner la polyligne comme il se déplace

Etapes 1: Créer une variable polyligne pour les références à mettre à jour comme ci-dessous

private Polyline polyline_path;

Étape 2: Sur MapReady Callback, faites comme ci-dessous

PolylineOptions routes = new PolylineOptions().width(5).color(Color.BLUE);
    polyline_path = mMap.addPolyline(routes);

Étape 3: Sur le nouvel emplacement, vous recevez l’appel ci-dessous en envoyant des points à cette méthode

  private void UpdatePoints(LatLng newlatlng) {
    List<LatLng> points = polyline_path.getPoints();
    points.add(newlatlng);
    polyline_path.setPoints(points);
}
0
manishkummar