Android
Posizione

introduzione

Osservazioni

API di posizione fusa

Esempio di utilizzo dell'attività con LocationRequest

/*
 * This example is useful if you only want to receive updates in this 
 * activity only, and have no use for location anywhere else.
 */
public class LocationActivity extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {

    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        mLocationRequest = new LocationRequest()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) //GPS quality location points
                .setInterval(2000) //At least once every 2 seconds
                .setFastestInterval(1000); //At most once a second
    }

    @Override
    protected void onStart(){
        super.onStart();
        mGoogleApiClient.connect();
    }
    
    @Override
    protected void onResume(){
        super.onResume();
        //Permission check for Android 6.0+
        if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            if(mGoogleApiClient.isConnected()) {
                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
            }
        }
    }
    
    @Override
    protected void onPause(){
        super.onPause();
        //Permission check for Android 6.0+
        if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            if(mGoogleApiClient.isConnected()) {
                LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
            }
        }
    }
    
    @Override
    protected void onStop(){
        super.onStop();
        mGoogleApiClient.disconnect();
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    }

    @Override
    public void onLocationChanged(Location location) {
        //Handle your location update code here
    }
}

Esempio Utilizzo servizio w / PendingIntent e BroadcastReceiver

ExampleActivity

Lettura consigliata: LocalBroadcastManager

/*
 * This example is useful if you have many different classes that should be 
 * receiving location updates, but want more granular control over which ones
 * listen to the updates.
 * 
 * For example, this activity will stop getting updates when it is not visible, but a database
 * class with a registered local receiver will continue to receive updates, until "stopUpdates()" is called here.
 *
 */
public class ExampleActivity extends AppCompatActivity {

    private InternalLocationReceiver mInternalLocationReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        
        //Create internal receiver object in this method only.
        mInternalLocationReceiver = new InternalLocationReceiver(this);
    }

    @Override
    protected void onResume(){
        super.onResume();
        
        //Register to receive updates in activity only when activity is visible
        LocalBroadcastManager.getInstance(this).registerReceiver(mInternalLocationReceiver, new IntentFilter("googleLocation"));
    }

    @Override
    protected void onPause(){
        super.onPause();
        
        //Unregister to stop receiving updates in activity when it is not visible.
        //NOTE: You will still receive updates even if this activity is killed.
        LocalBroadcastManager.getInstance(this).unregisterReceiver(mInternalLocationReceiver);
    }

    //Helper method to get updates
    private void requestUpdates(){
        startService(new Intent(this, LocationService.class).putExtra("request", true));
    }

    //Helper method to stop updates
    private void stopUpdates(){
        startService(new Intent(this, LocationService.class).putExtra("remove", true));
    }

    /*
     * Internal receiver used to get location updates for this activity.
     * 
     * This receiver and any receiver registered with LocalBroadcastManager does
     * not need to be registered in the Manifest.
     *
     */
    private static class InternalLocationReceiver extends BroadcastReceiver{

        private ExampleActivity mActivity;

        InternalLocationReceiver(ExampleActivity activity){
            mActivity = activity;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            final ExampleActivity activity = mActivity;
            if(activity != null) {
                LocationResult result = intent.getParcelableExtra("result");
                //Handle location update here
            }
        }
    }
}

Servizio di localizzazione

NOTA: non dimenticare di registrare questo servizio nel Manifesto!

public class LocationService extends Service implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;

    @Override
    public void onCreate(){
        super.onCreate();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

        mLocationRequest = new LocationRequest()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) //GPS quality location points
                .setInterval(2000) //At least once every 2 seconds
                .setFastestInterval(1000); //At most once a second
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
        super.onStartCommand(intent, flags, startId);
        //Permission check for Android 6.0+
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            if (intent.getBooleanExtra("request", false)) {
                if (mGoogleApiClient.isConnected()) {
                    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, getPendingIntent());
                } else {
                    mGoogleApiClient.connect();
                }
            }
            else if(intent.getBooleanExtra("remove", false)){
                stopSelf();
            }
        }

        return START_STICKY;
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        if(mGoogleApiClient.isConnected()){
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, getPendingIntent());
            mGoogleApiClient.disconnect();
        }
    }
    
    private PendingIntent getPendingIntent(){
        
        //Example for IntentService
        //return PendingIntent.getService(this, 0, new Intent(this, **YOUR_INTENT_SERVICE_CLASS_HERE**), PendingIntent.FLAG_UPDATE_CURRENT);
        
        //Example for BroadcastReceiver
        return PendingIntent.getBroadcast(this, 0, new Intent(this, LocationReceiver.class), PendingIntent.FLAG_UPDATE_CURRENT);
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        //Permission check for Android 6.0+
        if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, getPendingIntent());
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

LocationReceiver

NOTA: non dimenticare di registrare questo ricevitore nel Manifest!

public class LocationReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if(LocationResult.hasResult(intent)){
            LocationResult locationResult = LocationResult.extractResult(intent);
            LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("googleLocation").putExtra("result", locationResult));
        }
    }
}

Richiesta di aggiornamenti di posizione tramite LocationManager

Come sempre, è necessario assicurarsi di disporre delle autorizzazioni necessarie.

public class MainActivity extends AppCompatActivity implements LocationListener{

    private LocationManager mLocationManager = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    }


    @Override
    protected void onResume() {
        super.onResume();

        try {
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        }
        catch(SecurityException e){
            // The app doesn't have the correct permissions
        }
    }


    @Override
    protected void onPause() {
        try{
            mLocationManager.removeUpdates(this);
        }
        catch (SecurityException e){
            // The app doesn't have the correct permissions
        }

        super.onPause();
    }




    @Override
    public void onLocationChanged(Location location) {
        // We received a location update!
        Log.i("onLocationChanged", location.toString());
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}

Richiesta di aggiornamenti di posizione su un thread separato utilizzando LocationManager

Come sempre, è necessario assicurarsi di disporre delle autorizzazioni necessarie.

public class MainActivity extends AppCompatActivity implements LocationListener{

    private LocationManager mLocationManager = null;
    HandlerThread mLocationHandlerThread = null;
    Looper mLocationHandlerLooper = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        mLocationHandlerThread = new HandlerThread("locationHandlerThread");
    }


    @Override
    protected void onResume() {
        super.onResume();

        mLocationHandlerThread.start();
        mLocationHandlerLooper = mLocationHandlerThread.getLooper();

        try {
            mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this, mLocationHandlerLooper);
        }
        catch(SecurityException e){
            // The app doesn't have the correct permissions
        }
    }


    @Override
    protected void onPause() {
        try{
            mLocationManager.removeUpdates(this);
        }
        catch (SecurityException e){
            // The app doesn't have the correct permissions
        }

        mLocationHandlerLooper = null;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
            mLocationHandlerThread.quitSafely();
        else
            mLocationHandlerThread.quit();

        mLocationHandlerThread = null;


        super.onPause();
    }




    @Override
    public void onLocationChanged(Location location) {
        // We received a location update on a separate thread!
        Log.i("onLocationChanged", location.toString());

        // You can verify which thread you're on by something like this:
        // Log.d("Which thread?", Thread.currentThread() == Looper.getMainLooper().getThread() ? "UI Thread" : "New thread");
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}

Registra geofence

Ho creato GeoFenceObserversationService classe singleton .

GeoFenceObserversationService.java :

public class GeoFenceObserversationService extends Service implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, ResultCallback<Status> {

    protected static final String TAG = "GeoFenceObserversationService";
    protected GoogleApiClient mGoogleApiClient;
    protected ArrayList<Geofence> mGeofenceList;
    private boolean mGeofencesAdded;
    private SharedPreferences mSharedPreferences;
    private static GeoFenceObserversationService mInstant;
    public static GeoFenceObserversationService getInstant(){
        return mInstant;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mInstant = this;
        mGeofenceList = new ArrayList<Geofence>();
        mSharedPreferences = getSharedPreferences(AppConstants.SHARED_PREFERENCES_NAME, MODE_PRIVATE);
        mGeofencesAdded = mSharedPreferences.getBoolean(AppConstants.GEOFENCES_ADDED_KEY, false);

        buildGoogleApiClient();
    }


    @Override
    public void onDestroy() {
        mGoogleApiClient.disconnect();
        super.onDestroy();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    protected void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnected(Bundle connectionHint) {
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
    }

    @Override
    public void onConnectionSuspended(int cause) {

    }

    private GeofencingRequest getGeofencingRequest() {

        GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
        builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
        builder.addGeofences(mGeofenceList);
        return builder.build();
    }


    public void addGeofences() {
            if (!mGoogleApiClient.isConnected()) {
                Toast.makeText(this, getString(R.string.not_connected), Toast.LENGTH_SHORT).show();
                return;
            }

        populateGeofenceList();
        if(!mGeofenceList.isEmpty()){
            try {
                LocationServices.GeofencingApi.addGeofences(mGoogleApiClient, getGeofencingRequest(), getGeofencePendingIntent()).setResultCallback(this);
            } catch (SecurityException securityException) {
                securityException.printStackTrace();
            }
        }

        }

    public void removeGeofences() {
        if (!mGoogleApiClient.isConnected()) {
            Toast.makeText(this, getString(R.string.not_connected), Toast.LENGTH_SHORT).show();
            return;
        }
        try {
            LocationServices.GeofencingApi.removeGeofences(mGoogleApiClient,getGeofencePendingIntent()).setResultCallback(this);
        } catch (SecurityException securityException) {
            securityException.printStackTrace();
        }
    }


    public void onResult(Status status) {

        if (status.isSuccess()) {
            mGeofencesAdded = !mGeofencesAdded;
            SharedPreferences.Editor editor = mSharedPreferences.edit();
            editor.putBoolean(AppConstants.GEOFENCES_ADDED_KEY, mGeofencesAdded);
            editor.apply();
        } else {
            String errorMessage = AppConstants.getErrorString(this,status.getStatusCode());
            Log.i("Geofence", errorMessage);
        }
    }

    private PendingIntent getGeofencePendingIntent() {
        Intent intent = new Intent(this, GeofenceTransitionsIntentService.class);
        return PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    private void populateGeofenceList() {
        mGeofenceList.clear();
        List<GeoFencingResponce> geoFenceList = getGeofencesList;
        if(geoFenceList!=null&&!geoFenceList.isEmpty()){
            for (GeoFencingResponce obj : geoFenceList){
                mGeofenceList.add(obj.getGeofence());
                Log.i(TAG,"Registered Geofences : " + obj.Id+"-"+obj.Name+"-"+obj.Lattitude+"-"+obj.Longitude);
            }
        }
    }
}

AppConstant :

   public static final String SHARED_PREFERENCES_NAME = PACKAGE_NAME + ".SHARED_PREFERENCES_NAME";
    public static final String GEOFENCES_ADDED_KEY = PACKAGE_NAME + ".GEOFENCES_ADDED_KEY";
    public static final String DETECTED_GEOFENCES = "detected_geofences";
    public static final String DETECTED_BEACONS = "detected_beacons";

    public static String getErrorString(Context context, int errorCode) {
        Resources mResources = context.getResources();
        switch (errorCode) {
            case GeofenceStatusCodes.GEOFENCE_NOT_AVAILABLE:
                return mResources.getString(R.string.geofence_not_available);
            case GeofenceStatusCodes.GEOFENCE_TOO_MANY_GEOFENCES:
                return mResources.getString(R.string.geofence_too_many_geofences);
            case GeofenceStatusCodes.GEOFENCE_TOO_MANY_PENDING_INTENTS:
                return mResources.getString(R.string.geofence_too_many_pending_intents);
            default:
                return mResources.getString(R.string.unknown_geofence_error);
        }
    }

Dove ho iniziato il servizio? Dalla classe dell'applicazione

• startService(new Intent(getApplicationContext(),GeoFenceObserversationService.class));

Come ho registrato Geofences?

• GeoFenceObserversationService.getInstant().addGeofences();

Ottieni indirizzo da posizione usando Geocoder

Dopo aver ottenuto il Location oggetto dal FusedAPI , si può facilmente acquisire Address informazioni da quell'oggetto.

private Address getCountryInfo(Location location) {
    Address address = null;
    Geocoder geocoder = new Geocoder(getActivity(), Locale.getDefault());
    String errorMessage;
    List<Address> addresses = null;
    try {
        addresses = geocoder.getFromLocation(
                location.getLatitude(),
                location.getLongitude(),
                // In this sample, get just a single address.
                1);
    } catch (IOException ioException) {
        // Catch network or other I/O problems.
        errorMessage = "IOException>>" + ioException.getMessage();
    } catch (IllegalArgumentException illegalArgumentException) {
        // Catch invalid latitude or longitude values.
        errorMessage = "IllegalArgumentException>>" + illegalArgumentException.getMessage();
    }
    if (addresses != null && !addresses.isEmpty()) {
        address = addresses.get(0);
    }
    return country;
}

Ottenere gli aggiornamenti di posizione in un BroadcastReceiver

Per prima cosa creare una classe BroadcastReceiver per gestire gli aggiornamenti della posizione in arrivo:

public class LocationReceiver extends BroadcastReceiver implements Constants {

    @Override
     public void onReceive(Context context, Intent intent) {

        if (LocationResult.hasResult(intent)) {
            LocationResult locationResult = LocationResult.extractResult(intent);
            Location location = locationResult.getLastLocation();
            if (location != null) {
                // Do something with your location
            } else {
                Log.d(LocationReceiver.class.getSimpleName(), "*** location object is null ***");
            }
        }
    }
}

Quindi, quando ti connetti a GoogleApiClient nel callback onConnected:

@Override
public void onConnected(Bundle connectionHint) {
    Intent backgroundIntent = new Intent(this, LocationReceiver.class);
    mBackgroundPendingIntent = backgroundPendingIntent.getBroadcast(getApplicationContext(), LOCATION_REUEST_CODE, backgroundIntent, PendingIntent.FLAG_CANCEL_CURRENT);
    mFusedLocationProviderApi.requestLocationUpdates(mLocationClient, mLocationRequest, backgroundPendingIntent);
}

Non dimenticare di rimuovere l'intento di aggiornamento della posizione nella callback del ciclo di vita appropriato:

@Override
public void onDestroy() {
    if (servicesAvailable && mLocationClient != null) {
        if (mLocationClient.isConnected()) {
            fusedLocationProviderApi.removeLocationUpdates(mLocationClient, backgroundPendingIntent);
            // Destroy the current location client
            mLocationClient = null;
        } else {
            mLocationClient.unregisterConnectionCallbacks(this);
            mLocationClient = null;
        }
    }
    super.onDestroy();
}