我有一个服务，它在onCreateMethod中请求网络位置更新。我已使用LocationListener接收新位置，提供程序的状态以及提供程序中的statusChange。
当设备处于低功耗状态（手机屏幕关闭）时，我会获得与手机屏幕处于活动状态（屏幕开启）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，并在设备屏幕关闭的情况下走了近50KM。我附上了旅行的日志。
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Android 2.3.3的HTC Explorer中运行。有没有人能回答这种行为？
答案 0 :(得分：0)
获得相同位置更新的问题仅在HTC手机中发生。我不知道这是否会出现在所有HTC Android手机上。但它确实发生在我的HTC Explorer上。
在后台获得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Internet连接（WIFI或移动数据连接）。为了交叉检查，我写了下面的代码。
我让代码彻夜不眠。
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");
}
}
因此，应用程序开发人员要小心，如果您想在HTC手机的后台进行HTTP呼叫，如果手机处于非活动状态超过15分钟，则会失败。
此问题已报告HTC Deep Sleep