Im using SyncAdapter for some server client synchronization. In the official
developer guide
<http://developer.android.com/training/sync-adapters/running-sync-adapter.html>
it
is mentioned that there are different methods to trigger a sync.
*1 Run the Sync Adapter When Server Data Changes*
You simply call:
ContentResolver.requestSync(ACCOUNT, AUTHORITY, null);
When server data changes (on GCM for example).
*2 Run the Sync Adapter When Content Provider Data Changes*
Simply use a ContentObserver
public class TableObserver extends ContentObserver {
@Override
public void onChange(boolean selfChange) {
onChange(selfChange, null);
}
@Override
public void onChange(boolean selfChange, Uri changeUri) {
ContentResolver.requestSync(ACCOUNT, AUTHORITY, null);
}
}
*3 Run the Sync Adapter After a Network Message*
Do the following:
ContentResolver.setSyncAutomatically(ACCOUNT, AUTHORITY, true)
Now everytime when there is an open TCP/IP connection the SyncAdapter is
triggered to perform the sync.
*4 Run the Sync Adapter Periodically*
This is for me the important and interesting part. For that you simply have
to do this (at least this is written in the developers guide):
public static final long SECONDS_PER_MINUTE = 60L;
public static final long SYNC_INTERVAL_IN_MINUTES = 60L;
public static final long SYNC_INTERVAL = SYNC_INTERVAL_IN_MINUTES *
SECONDS_PER_MINUTE;
ContentResolver.addPeriodicSync(
ACCOUNT,
AUTHORITY,
Bundle.EMPTY,
SYNC_INTERVAL);
*Now to the problem*
Solution 1, 2 and 3 are working perfectly as they should. The periodical
sync does not. If i just do what is descriped under point 4 the
synchronization is never triggered (yes i did enable the auomatic
synchronisation in the system settings of my android device).
If i do the following:
ContentResolver.setIsSyncable(account, ContentProviderMeasure.AUTHORITY, 1);
ContentResolver.setSyncAutomatically(account, ContentProviderMeasure.
AUTHORITY, true);
ContentResolver.addPeriodicSync(account, ContentProviderMeasure.AUTHORITY,
new Bundle(), 3600);
The SyncAdapter sync refresh is called every minute (it should be every
hour / 3600 seconds = 1 hour). If i do the following:
ContentResolver.setIsSyncable(account, ContentProviderMeasure.AUTHORITY, 1);
ContentResolver.addPeriodicSync(account, ContentProviderMeasure.AUTHORITY,
new Bundle(), 3600);
The sync is only triggered once at creation time and after that never
again. Yes, as i mentioned already, the automatic sync in the android
devices settings is enabled.
Triggering the sync manually for my app in the android device settings
accountmanager is working fine.
*So why does the periodic sync does not work?*
I tested on Nexus 4 with Android 6.0, On Galaxy Ace with Android 4.4 and on
Galaxy S3 Mini with Android 4.1. All devices are not syncing periodically.
I also posted my question on
Stackoverflow:
http://stackoverflow.com/questions/35879056/sync-not-triggered-as-mentioned-in-developer-guide
--
You received this message because you are subscribed to the Google Groups
"Android Developers" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to android-developers+unsubscr...@googlegroups.com.
To post to this group, send email to android-developers@googlegroups.com.
Visit this group at https://groups.google.com/group/android-developers.
To view this discussion on the web visit
https://groups.google.com/d/msgid/android-developers/0591242e-86c5-4146-a892-7921296bcf35%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
