What Window Size that Would Fit All Devices?

KanataEXE

All android devices have their own window size. So the best way to fit the size is to code it into the game.

But... is there a "best" size that would fit all without coding it?

cybereality

You have to set the window to 2D mode expand. Then make the window size square with the smallest height you want your game to look good at. For my project I set it to 720 x 720, but it will work with any dimension. That is the best for 2D games.

Calinou

Note that many Android devices use 1080p or even 1440p resolutions nowadays, so if you want your visuals to be the most crisp possible on such devices, I'd use 1080 × 1080 or even 1440 × 1440 as a base resolution. However, this will also require your 2D visuals to have a higher resolution, making your game's distribution size larger. Higher-resolution textures are also more demanding on the device's GPU (though not that much).

Still, if in doubt, stick to 720 × 720. See Multiple resolutions in the documentation for more information.

cybereality

Good point. 1080p+ seems more common with newer phones, but I do see some stats (from the web) that imply that many users (probably internationally) are on lower resolutions.

https://gs.statcounter.com/screen-resolution-stats/mobile/worldwide

Note, these may be low-end or non-smart phones as well, that maybe don't even run OpenGL/games very well but it is something to consider. Also, sometimes browsers report lower screen dimensions for compatibility, so that site might not tell the whole story.

One issue I had personally was that 720x720 looked pretty good on mobile, but way too enlarged on a monitor (I tested at 1080p and 1440p). At 1080p it was acceptable, but on the 1440p monitor it didn't look great. Probably not a huge concern on mobile, because the screens are smaller, but it does affect games if you want to push to mobile/desktop from the same project.