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package com.mapbox.mapboxsdk.location;
import android.content.Context;
import android.location.Location;
import android.support.annotation.NonNull;
import com.mapbox.services.android.telemetry.location.LocationEngine;
import com.mapbox.services.android.telemetry.location.LocationEngineListener;
import com.mapbox.services.android.telemetry.location.LocationEnginePriority;
import com.mapbox.services.android.telemetry.permissions.PermissionsManager;
import com.mapzen.android.lost.api.LocationListener;
import com.mapzen.android.lost.api.LocationRequest;
import com.mapzen.android.lost.api.LocationServices;
import com.mapzen.android.lost.api.LostApiClient;
import java.lang.ref.WeakReference;
import timber.log.Timber;
/**
* Manages locational updates. Contains methods to register and unregister location listeners.
* <ul>
* <li>You can register a LocationEngineListener with LocationSource#addLocationEngineListener(LocationEngineListener)
* to receive location updates.</li>
* <li> You can unregister a LocationEngineListener with
* LocationEngine#removeLocationEngineListener(LocationEngineListener)} to stop receiving location updates.</li>
* </ul>
* <p>
* Note: If registering a listener in your Activity.onStart() implementation, you should unregister it in
* Activity.onStop(). (You won't receive location updates when paused, and this will cut down on unnecessary system
* overhead). Do not unregister in Activity.onSaveInstanceState(), because this won't be called if the user moves back
* in the history stack.
* </p>
*/
public class LocationSource extends LocationEngine implements
LostApiClient.ConnectionCallbacks, LocationListener {
private static LocationEngine instance;
private WeakReference<Context> context;
private LostApiClient lostApiClient;
private LocationSource(Context context) {
super();
this.context = new WeakReference<>(context);
lostApiClient = new LostApiClient.Builder(this.context.get())
.addConnectionCallbacks(this)
.build();
}
/**
* Get the LocationEngine instance.
*
* @param context a Context from which the application context is derived
* @return the LocationEngine instance
*/
public static synchronized LocationEngine getLocationEngine(@NonNull Context context) {
if (instance == null) {
instance = new LocationSource(context.getApplicationContext());
}
return instance;
}
/**
* Activate the location engine which will connect whichever location provider you are using. You'll need to call
* this before requesting user location updates using {@link LocationEngine#requestLocationUpdates()}.
*/
@Override
public void activate() {
if (lostApiClient != null && !lostApiClient.isConnected()) {
lostApiClient.connect();
}
}
/**
* Disconnect the location engine which is useful when you no longer need location updates or requesting the users
* {@link LocationEngine#getLastLocation()}. Before deactivating, you'll need to stop request user location updates
* using {@link LocationEngine#removeLocationUpdates()}.
*/
@Override
public void deactivate() {
if (lostApiClient != null && lostApiClient.isConnected()) {
lostApiClient.disconnect();
}
}
/**
* Check if your location provider has been activated/connected. This is mainly used internally but is also useful in
* the rare case when you'd like to know if your location engine is connected or not.
*
* @return boolean true if the location engine has been activated/connected, else false.
*/
@Override
public boolean isConnected() {
return lostApiClient.isConnected();
}
/**
* Invoked when the location provider has connected.
*/
@Override
public void onConnected() {
for (LocationEngineListener listener : locationListeners) {
listener.onConnected();
}
}
/**
* Invoked when the location provider connection has been suspended.
*/
@Override
public void onConnectionSuspended() {
Timber.d("Connection suspended.");
}
/**
* Returns the Last known location is the location provider is connected and location permissions are granted.
*
* @return the last known location
*/
@Override
public Location getLastLocation() {
if (lostApiClient.isConnected() && PermissionsManager.areLocationPermissionsGranted(context.get())) {
//noinspection MissingPermission
return LocationServices.FusedLocationApi.getLastLocation(lostApiClient);
}
return null;
}
/**
* Request location updates to the location provider.
*/
@Override
public void requestLocationUpdates() {
// Common params
LocationRequest request = LocationRequest.create()
.setInterval(1000)
.setFastestInterval(1000)
.setSmallestDisplacement(3.0f);
// Priority matching is straightforward
if (priority == LocationEnginePriority.NO_POWER) {
request.setPriority(LocationRequest.PRIORITY_NO_POWER);
} else if (priority == LocationEnginePriority.LOW_POWER) {
request.setPriority(LocationRequest.PRIORITY_LOW_POWER);
} else if (priority == LocationEnginePriority.BALANCED_POWER_ACCURACY) {
request.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
} else if (priority == LocationEnginePriority.HIGH_ACCURACY) {
request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
if (lostApiClient.isConnected() && PermissionsManager.areLocationPermissionsGranted(context.get())) {
//noinspection MissingPermission
LocationServices.FusedLocationApi.requestLocationUpdates(lostApiClient, request, this);
}
}
/**
* Dismiss ongoing location update to the location provider.
*/
@Override
public void removeLocationUpdates() {
if (lostApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(lostApiClient, this);
}
}
/**
* Invoked when the Location has changed.
*
* @param location the new location
*/
@Override
public void onLocationChanged(Location location) {
for (LocationEngineListener listener : locationListeners) {
listener.onLocationChanged(location);
}
}
}
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