Android Digital signage cliend development (preferrer for Russian speaking)

We have 50% completed project for Android digital signage player software for out company https://mmvs.ru. Current status of project: FINISHED DS protocol implementation (remote calls, answers, notifications) Preparing tasks (media files preloading) App tested with mock DS API (which tests only set_schedule method) Tested all schedule types (default, with end time, without end time (implemented for video tasks only)) Fragments for video, web, slideshow, stream tasks Tested videos/images preloading. Task not started until resources loaded. NOT TESTED Is task not executed if preloading finished after its end time Schedule repetition each day and repeat repeatable tasks each hour Upload new schedule when another is playing now Not tested with real DS server NOT STARTED/FINISHED Switching tasks when current finished (stream finished, all slides has been displayed) for slideshow and stream tasks Error handling (exceptions in the app, network errors, data errors etc) Persistent storing the current schedule (for app restart support) (DB) Splash screen when start app and loading default task set_headline method set_time method. Required app to be system app (may have to build own system image) data for reports more flexible configuration file storage management: check requiredSpace field from the set_schedule method params, (not presented in new schedule) downloaded files deletion storing downloaded files info in the persistent storage to avoid files reloading (file names in DS are unique) Details will be provided for right candidate.