Add "roaming" option to run conditions (fixes #177)

[Catfriend1]

Purpose:

• Add "roaming" option to run conditions (fixes Add "roaming" option to run conditions #177)

Testing:

• Theoretically works on the emulator at commit ea71f11 (AVD 9.x). But isn't verifyable if it works correctly in real life as it depends in which order and if android sends the CONNECTIVITY_ACTION in ConnectionManager.

[Catfriend1]

So there's a problem until here: The Network(Broadcast)Receiver doesn't fire if mobile data connection changes from roaming to non-roaming (or back). Roaming detection itself and stopping SyncthingNative works already.

[Catfriend1]

@balihb @NicoWeio @sobotkami @jangrewe

Hi all together :-).

I've added a new run condition "run while roaming" which can be used to disabled syncthing when the phone enters roaming state. Unfortunately, I can't test this myself. Playing around with the Android emulator discovers that it might /potentially/ not work as expected even if the code in place looks right.

Here's hat I did:

1. Unchecked run condition "run while roaming"
2. Emulated 3G mobile data connection with the cellular profile "Home"
3. Syncthing runs - that's fine.
4. Emulated the cellular profile "roaming" for data
5. !! Syncthing still runs, the BroadcastReceiver's action doesn't fire on the Android side (ConnectivityManager.CONNECTIVITY_ACTION). == So this seems to NOT work.
6. Switch cell profile emulation to "Home", then to "Searching", then to "Roaming"
7. Syncthing stops running - that's the behaviour we want and fine.
8. Switch cell profile emulation to "Roaming", then to "Searching", then to "Home"
9. Syncthing starts running - that's the behaviour we want and fine.

I would REALLY appreciate if someone of you could provide me feedback if the new run condition works and Syncthing immediately(!) stops when entering roaming while the setting is unchecked.

I'll put up a BETA release on Google Play soon, so you can just subscribe to the OPEN BETA channel and grab it. GitHub will also get a BETA on the releases page to download the APK directly.

Thank you in advance.

Kind regards,
Catfriend1

[Catfriend1]

The new release can be downloaded here:
https://github.com/Catfriend1/syncthing-android/releases/tag/rc1.2.0.6

(and on GPlay BETA channel)