Thousand different android devises resolutions handling

Hey all, the different resolution handling for android platform confusing me a bit right now.
Where do I need to be carefull when i'm designing the UI for mobile since the UI scale depends on devise, it becomes pretty ugly if the resolution is higher than the UI is designed for. So how to prevent that? One idea I had was to design the UI in bigger scale but is that correct or is there any other way?

Another thing, lets's say I have a background sprite image that uses the sprite renderer component. How do I handle the correct position and scale of the sprite for every resolution?

Thanks,
Kamil

 

I found it easiest to change the UI setting to "constant physical size" and play around with the numbers. Going with millimetres and playing around made my UI look pretty much identical on all devices.

 

So far I only write games for android, now because I have these devices

Samsung 10.1 (1280 x 800)
Nexus 7(1200 x 1920)
Nexus 9(1536 x 2048)
Nexus 6(1440 x 2560)

And some others

I can cover a lot of different screen size.

I set my Canvas UI as follows:

Canvas : Screen Space - Overlay
Pixel Perfect: checked

Canvas Scaler: Scale With Screen Size
Reference Resolution: X = 1440 Y = 2560 'E.g the Nexus 6'
Screen Match Mode: Shrink
Reference Pixels Per unity: 100

Now that the latter end of this pod cast, they do say about game size not much about UI but I thought it might help