Hello, I own a Samsung Galaxy Tab S8 Ultra. Long story short, OSRS Mobile plays like a dream on it. Here's a summary of the different types of input devices that are supported and their associated behavior...
Book Cover Keyboard (the official Samsung one): * keys work as you'd expect, the keyboard can be used to type in-game, you can use the number keys as shortcuts in certain menus, and you can use spacebar to advance dialogue/confirm selections. In addition, the trackpad can be used as an input device. Use one finger to register a left-click, two fingers/press and hold with one finger to register a right-click, drag with two fingers to pan the camera left and right, and pinch to zoom in or out.
Mouse (Bluetooth and wired via OTG cable): Works exactly as it does on PC, assuming you're using a typical three-button mouse.
S Pen: Works exactly the same as using a single finger, but with better accuracy since you won't fatfinger much. I say it like that, since you can't zoom in or out using the S Pen. The button does nothing in-game, as it is used exclusively by the operating system for Air Command and other features.
Note: Samsung's version of Android has a feature called multi-window, which allows you to pop applications out into windows and resize or move then around on screen. OSRS Mobile doesn't like being popped out into a window (you can do it, but you can't move the window around). It will work perfectly fine in fullscreen. This includes having other popped-out windows overlaying OSRS, and having two or more fullscreen apps open side-by-side (including OSRS Mobile).
P.S. The latest update has somewhat broken S Pen support, in that you can no longer tap and hold to right-click or tap and drag to move the camera. Any contact between the S Pen and screen registers as a single left-click. This has happened before when Jagex was revamping mouse support on mobile, and they were quick to fix it last time (via the very next update). Hopefully they fix this soon...
17-Feb-2023 00:41:22