/*
* Copyright 2012 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.android.apps.mytracks.services;
import com.google.android.apps.mytracks.util.GoogleLocationUtils;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
/**
* My Tracks Location Manager. Applies Google location settings before allowing
* access to {@link LocationManager}.
*
* @author Jimmy Shih
*/
public class MyTracksLocationManager {
/**
* Observer for Google location settings.
*
* @author Jimmy Shih
*/
private class GoogleSettingsObserver extends ContentObserver {
public GoogleSettingsObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
isAllowed = GoogleLocationUtils.isAllowed(context);
}
}
private final ConnectionCallbacks connectionCallbacks = new ConnectionCallbacks() {
@Override
public void onDisconnected() {}
@Override
public void onConnected(Bundle bunlde) {
handler.post(new Runnable() {
@Override
public void run() {
if (requestLastLocation != null && locationClient.isConnected()) {
requestLastLocation.onLocationChanged(locationClient.getLastLocation());
requestLastLocation = null;
}
if (requestLocationUpdates != null && locationClient.isConnected()) {
LocationRequest locationRequest = new LocationRequest().setPriority(
LocationRequest.PRIORITY_HIGH_ACCURACY).setInterval(requestLocationUpdatesTime)
.setFastestInterval(requestLocationUpdatesTime)
.setSmallestDisplacement(requestLocationUpdatesDistance);
locationClient.requestLocationUpdates(
locationRequest, requestLocationUpdates, handler.getLooper());
}
}
});
}
};
private final OnConnectionFailedListener
onConnectionFailedListener = new OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
};
private final Context context;
private final Handler handler;
private final LocationClient locationClient;
private final LocationManager locationManager;
private final ContentResolver contentResolver;
private final GoogleSettingsObserver observer;
private boolean isAllowed;
private LocationListener requestLastLocation;
private LocationListener requestLocationUpdates;
private float requestLocationUpdatesDistance;
private long requestLocationUpdatesTime;
public MyTracksLocationManager(Context context, Looper looper, boolean enableLocaitonClient) {
this.context = context;
this.handler = new Handler(looper);
if (enableLocaitonClient) {
locationClient = new LocationClient(context, connectionCallbacks, onConnectionFailedListener);
locationClient.connect();
} else {
locationClient = null;
}
locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
contentResolver = context.getContentResolver();
observer = new GoogleSettingsObserver(handler);
isAllowed = GoogleLocationUtils.isAllowed(context);
contentResolver.registerContentObserver(
GoogleLocationUtils.USE_LOCATION_FOR_SERVICES_URI, false, observer);
}
/**
* Closes the {@link MyTracksLocationManager}.
*/
public void close() {
if (locationClient != null) {
locationClient.disconnect();
}
contentResolver.unregisterContentObserver(observer);
}
/**
* Returns true if allowed to access the location manager. Returns true if
* there is no enforcement or the Google location settings allows access to
* location data.
*/
public boolean isAllowed() {
return isAllowed;
}
/**
* Returns true if gps provider is enabled.
*/
public boolean isGpsProviderEnabled() {
if (!isAllowed()) {
return false;
}
String provider = LocationManager.GPS_PROVIDER;
if (locationManager.getProvider(provider) == null) {
return false;
}
return locationManager.isProviderEnabled(provider);
}
/**
* Request last location.
*
* @param locationListener location listener
*/
public void requestLastLocation(final LocationListener locationListener) {
handler.post(new Runnable() {
@Override
public void run() {
if (!isAllowed()) {
requestLastLocation = null;
locationListener.onLocationChanged(null);
} else {
requestLastLocation = locationListener;
connectionCallbacks.onConnected(null);
}
}
});
}
/**
* Requests location updates. This is an ongoing request, thus the caller
* needs to check the status of {@link #isAllowed}.
*
* @param minTime the minimal time
* @param minDistance the minimal distance
* @param locationListener the location listener
*/
public void requestLocationUpdates(
final long minTime, final float minDistance, final LocationListener locationListener) {
handler.post(new Runnable() {
@Override
public void run() {
requestLocationUpdatesTime = minTime;
requestLocationUpdatesDistance = minDistance;
requestLocationUpdates = locationListener;
connectionCallbacks.onConnected(null);
}
});
}
/**
* Removes location updates.
*
* @param locationListener the location listener
*/
public void removeLocationUpdates(final LocationListener locationListener) {
handler.post(new Runnable() {
@Override
public void run() {
requestLocationUpdates = null;
if (locationClient != null && locationClient.isConnected()) {
locationClient.removeLocationUpdates(locationListener);
}
}
});
}
}