我需要创建实时路径跟踪应用。我使用FusedLocationProviderApi 来获取当前位置。我的问题是当设备被锁定时FusedLocationProvider如何更新位置。当跟踪正在进行时，我尝试使用WAKE_LOCK进行设备唤醒，但这会导致设备停止并导致电池耗尽。请建议我摆脱它。以下是我的位置服务代码
public class LocationService extends Service {
public static float MIN_DIST = 50.0f;
public static float MIN_SPEED = 0.0f;
public static final String BROADCAST_ACTION = "LocationService.LOCATION_UPDATE";
public LocationManager locationManager;
public MyLocationListener listener;
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 0; // in meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 5*1000; // in mili
Intent intent;
String tag=getClass().getSimpleName();
PowerManager powerManager;
// WakeLock wakeLock;
Timer checkLastLocUpdateTimer; // timer to check time of last loc update and reset loc update if required
@Override
public void onCreate() {
super.onCreate();
intent = new Intent(BROADCAST_ACTION);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
listener = new MyLocationListener();
powerManager = (PowerManager) getSystemService(POWER_SERVICE);
/*wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"FUSED_LOCATOIN_SERVICE_WAKE_LOCK");*/
checkLastLocUpdateTimer = new Timer();
//Set the schedule function and rate
checkLastLocUpdateTimer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run()
{
long maxWaitTimeforUpdate = 60*1000; // in millis
long currentTime = System.currentTimeMillis();
long lastLocUpdateTime = Pref.getLastLocUpdateTime(getApplicationContext());
long timeDiff = currentTime- lastLocUpdateTime;
Log.e(tag,"Time since last loc update: "+timeDiff);
if(timeDiff>maxWaitTimeforUpdate)
{
Log.e(tag,"Time since last loc update is more than max waiting time: "+timeDiff);
//if(mGoogleApiClient.isConnected())
{
Log.e(tag,"Restarting Location Updates..." );//
startStopLocationUpdateHandler.sendEmptyMessage(0);
}
}
}
},
//Set how long before to start calling the TimerTask (in milliseconds)
30*1000,
//Set the amount of time between each execution (in milliseconds)
30*1000);
Log.e(tag,"OnCreate()");
}
private final Handler startStopLocationUpdateHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
stopLocationUpdates();
startLocationUpdates();
}
};
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("LocationService", "onStartCommand");
// wakeLock.acquire();
startLocationUpdates();
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
super.onDestroy();
checkLastLocUpdateTimer.cancel();
stopLocationUpdates();
/*if(wakeLock.isHeld())
{
wakeLock.release();
}*/
Log.e(tag,"OnDestroy()");
}
protected void startLocationUpdates()
{
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
listener);
Log.e(tag,"Requested location update");
}
protected void stopLocationUpdates()
{
locationManager.removeUpdates(listener);
Log.e(tag,"Location updates removed");
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(final Location loc)
{
Log.e(tag, "locationChanged "+loc.toString());
Pref.setLastLocUpdateTime(System.currentTimeMillis(), getApplicationContext());
intent.putExtra("Latitude", loc.getLatitude());
intent.putExtra("Longitude", loc.getLongitude());
intent.putExtra("Provider", loc.getProvider());
intent.putExtra("Accuracy", loc.getAccuracy());
intent.putExtra("Altitude", loc.getAltitude());
intent.putExtra("Bearing", loc.getBearing());
intent.putExtra("Speed", loc.getSpeed());
intent.putExtra("Time", loc.getTime());
sendBroadcast(intent);
}
public void onProviderDisabled(String provider) {
Log.e(tag,"onProviderDisabled: "+provider.toString());
}
public void onProviderEnabled(String provider) {
Log.e(tag,"onProviderEnabled: "+provider.toString());
}
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.e(tag,"onStatusChanged- provider: "+provider.toString()+" status: "+status);
}
}
}