即使我已显着移动，也会在后台更新相同的位置

Posted 2023-04-14

【中文标题】即使我已显着移动，也会在后台更新相同的位置

【英文标题】：Same Location updates in the background even though I have moved Significantly

【发布时间】：2013-03-10 13:22:39

【问题描述】：

我有一项服务，它在 onCreateMethod 中请求网络位置更新。我已经使用 LocationListener 来接收新的位置、提供者的状态和提供者中的 statusChange。

当设备处于低电量状态（手机屏幕关闭）时，我获得了与手机屏幕处于活动状态（屏幕打开）时网络提供商相同的位置修复。

public class LocationRegisterService extends Service implements LocationListener

private String TAG = LocationRegisterService.class.getName();

private LocationManager lm;

public void onCreate()

    Log.d(TAG,"Entering LocationRegisterService::onCreate()");
    //Register for network location updates
    lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    Log.i(TAG,"Regsitering for Network Location Updates");
    Log.i(TAG,"minTime = 0,minDistance = 0");
    lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
            Log.d(TAG,"Exiting LocationRegisterSerivce::onCreate()");


public int onStartCommand(Intent intent, int flags, int startId)

    Log.d(TAG,"Entering LocationRegisterService::onStartCommand()");
    Log.d(TAG,"Exiting LocationRegisterService::onStartCommand()");
    return Service.START_STICKY;



@Override
public IBinder onBind(Intent arg0) 
    // TODO Auto-generated method stub
    return null;


public void onDestroy() 

    super.onDestroy();
    Log.d(TAG,"Entering LocationRegisterService::onDestroy()");
    lm.removeUpdates(this);
    Log.d(TAG,"Exiting LocationRegisterService::onDestroy()");


@Override
public void onLocationChanged(Location location) 
    Helpers.logScreenStatus(this);
    double latitude = location.getLatitude();
    double longitude = location.getLongitude();
    double accuracy = location.getAccuracy();
    String location_timestamp = formatTime(location.getTime());
    String log = latitude + "," + longitude +","+accuracy+","+location_timestamp;
    Log.i(TAG,log);


@Override
public void onProviderDisabled(String provider) 
    String log = "Network Provider Disabled";


@Override
public void onProviderEnabled(String provider) 
    String log = "Network Provider Enabled";


@Override
public void onStatusChanged(String provider, int status, Bundle extras) 
    String log = "";
    switch(status)
        case LocationProvider.AVAILABLE:
            log = "Network Available";
            break;
        case LocationProvider.OUT_OF_SERVICE:
            log = "Network Out Of Service";
            break;
        case LocationProvider.TEMPORARILY_UNAVAILABLE:
            log = "Network Temporarily Unavailable";
            break;
    
    setServiceWakeUpTime();
    stopSelf();


private void setServiceWakeUpTime()

    AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(this,AlarmReceiver.class);
    PendingIntent operation = PendingIntent.getBroadcast(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);
    long wakeAt = System.currentTimeMillis() + (60 * 1000);
    am.set(AlarmManager.RTC_WAKEUP, wakeAt , operation);
    FileLogger.log(this, "Service will wake up after one minute");


private String formatTime(long epoch)

    Date date = new Date(epoch);
    String pattern = "y/M/d H:m:s.S";
    SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);
    return dateFormat.format(date);

我从一项活动开始这项服务，并在关闭设备屏幕的情况下行驶了近 50 公里。我正在附上旅行的日志。

2013/3/21 0:29:58.743  Entering Broadcast Receiver
2013/3/21 0:29:58.756  Screen is off
2013/3/21 0:29:58.778  Exiting Broadcast Receiver
2013/3/21 0:29:58.783  Registering for network location updates
2013/3/21 0:30:53.571  Screen is off
2013/3/21 0:30:53.587  13.07383585,80.22151335000001,50.0,2013/3/21 0:30:8.551
2013/3/21 0:30:53.593  Screen is off
2013/3/21 0:30:53.595  Network Temporarily Unavailable
2013/3/21 0:30:53.613  Service will wake up after one minute
2013/3/21 0:30:53.619  UnRegistering listener for location updates
2013/3/21 0:31:53.676  Entering Broadcast Receiver
2013/3/21 0:31:53.689  Screen is off
2013/3/21 0:31:53.710  Exiting Broadcast Receiver
2013/3/21 0:31:58.516  Registering for network location updates
2013/3/21 0:32:17.583  Screen is off
2013/3/21 0:32:17.594  13.07383585,80.22151335000001,50.0,2013/3/21 0:32:3.544

相同的日志重复了将近一个小时。此代码在 HTC Explorer 中运行 android 2.3.3。有人对此行为有答案吗？

【问题讨论】：

我将尝试使用部分唤醒锁定并分享我的结果。

如果您在onStatusChange() 中评论setServiceWakeUpTime(); 和stopSelf(); 会发生什么？根据日志，您的提供商刚刚进入临时不可用状态。它可以在几秒钟内从中恢复。看看它恢复后是否会为您提供正确的更新。

@AshishGupta 我上面提到的问题只发生在HTC。一旦设备处于非活动状态超过 15 分钟，它就会关闭 wifi 和任何活动的移动数据连接。因此，即使我已经大幅移动，它也会返回相同的位置。

@DavidOlsson 使用 WakeLocks 在这里没有任何区别。我通过专门接收 PARTIAL_WAKE_LOCK 尝试了上面的代码，但结果相同（即使我移动了很多，但在后台更新了相同的位置）。

【参考方案1】：

获取相同位置更新的问题仅发生在 HTC 手机中。我不知道这是否发生在所有 HTC Android 手机上。但它肯定会出现在我的 HTC Explorer 上。

在后台获取相同位置更新的原因是，一旦手机处于非活动状态超过 15 分钟，HTC 将禁用添加活动的互联网连接（WIFI 或移动数据连接）。为了交叉检查，我编写了以下代码。

安排一分钟后调用 AlarmReceiver 的活动。 警报接收器检查是否有任何连接可以建立互联网连接。 警报接收器会在一分钟后注册警报以调用自身

我编写的代码可以通宵运行。

public class AlarmReceiver extends BroadcastReceiver 

private static String TAG = AlarmReceiver.class.getName();

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

    Log.i(TAG, "Entering Broadcast Receiver onReceive");
    FileLogger.log(context, "Entering Broadcast Receiver");
    logActiveNetworkInfo(context);
    setAlarm(context);
    FileLogger.log(context, "Exiting Broadcast Receiver");
    Log.i(TAG, "Exiting Broadcast Receiver onReceive");


private void logActiveNetworkInfo(Context context)

    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    if(networkInfo == null)
    
        FileLogger.log(context, "No network connectivity");
        return;
    
    String networkTypeName = networkInfo.getTypeName();
    boolean isConnected = networkInfo.isConnected();
    String log = "";
    if(isConnected == true)
    
        log = "Internet available through " + networkTypeName;
    
    else
        log = "Internet not available through "+ networkTypeName;
    FileLogger.log(context, log);
    Log.i(TAG,log);
    return;


private void setAlarm(Context context)

    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    long wakeUpAt = System.currentTimeMillis() + (60 * 1000);
    Intent intent = new Intent(context, AlarmReceiver.class);
    PendingIntent operation = PendingIntent.getBroadcast(context,
                                                         0,
                                                         intent,
                                                         PendingIntent.FLAG_UPDATE_CURRENT);
    alarmManager.set(AlarmManager.RTC_WAKEUP, wakeUpAt , operation);
    Log.i(TAG,"Alarm set to ring after "+wakeUpAt + " milliseconds");

所以应用开发者要小心，如果你想在 HTC 手机的后台进行 HTTP 调用，如果手机处于非活动状态超过 15 分钟就会失败。

此问题已报告HTC Deep Sleep

【讨论】：

这与HTC设备中的SmartSync功能有关。