Only accept content URIs in share activity

Tasks is libre open-source software, based on the original source code from the popular Astrid Tasks & To Do List! Tasks can be used entirely offline, or synchronized with Google Tasks, CalDAV, or EteSync. It is your data, you should get to choose where it is stored! ● Features ○ • Nested subtasks with unlimited depth • Powerful repeating task options • End-to-end encryption with EteSync • List sharing available when synchronized with CalDAV or EteSync • Location-based arrival and departure notifications • Tag, filter, and search your tasks • Drag and drop manual sorting for Google Tasks • Customize your lists with different icons and colors • Hide tasks until a later date • Automatically add tasks to your calendar • Create new tasks and list reminders with Tasker • And much more! ¡ Tasks respects your privacy! ¡ • No advertisements • No ad or location tracking • Opt-out of crash reporting and anonymous statistics • Developer has no access to your data under any circumstances