Replaces the group tab and server list RecyclerView in MainActivity with a ViewPager2-based implementation using fragments. Adds GroupPagerAdapter and GroupServerFragment for per-group server lists, introduces BaseFragment for fragment view binding, and updates related logic in MainViewModel and SettingsChangeManager. Updates dependencies to include ViewPager2 and Fragment KTX, and modifies layouts to support the new structure.
Introduces a new BackupActivity for configuration backup and restore, supporting both local storage and WebDAV servers. Adds WebDavManager and WebDavConfig for handling WebDAV operations, updates the navigation drawer and menu, and refactors AboutActivity to remove backup/restore logic. Includes new layouts and string resources for backup options and WebDAV settings.
Deleted Tun2SocksService and all code paths, preferences, and UI related to toggling between HevSocks5Tunnel and tun2socks. The app now always uses HevSocks5Tunnel for VPN traffic, simplifying configuration and maintenance.
Introduces a new POLICYGROUP config type for server grouping and selection. Adds ServerGroupActivity and related UI, updates menu options, and removes legacy intelligent selection logic. Refactors config management and filtering to support policy groups, and updates translations and resources accordingly.
Deleted ServerConfig and MigrateManager classes, and removed the legacy migration call from MainActivity. This cleans up obsolete migration code now that server configuration migration is no longer required.
Raised minSdk to 24 and removed conditional code for pre-Nougat Android versions. Cleaned up context wrapping, notification, and service start logic to use modern APIs. Also removed unnecessary @RequiresApi annotations and legacy feature declarations from the manifest.
Refactored all usages of JsonUtil.fromJson to handle null return values, improving robustness against malformed or missing JSON data. Updated method signature to return nullable types and adjusted related logic throughout the codebase to prevent potential crashes.
Changed hev tunnel read/write timeout preference to accept separate TCP and UDP values in seconds (default 300,60). Updated related keys, default values, and UI strings across multiple languages to reflect the new format and units.
https://github.com/2dust/v2rayNG/issues/5057
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