Android Question Font size on different diagonals and screen resolutions

Resolution without scale is meaningless.
ActivitySize is the same as the 5'' or 10'' that you wrote above. It is the activity (approximate) diagonal size in inches.

In most cases you don't need to do anything else other then to use AutoScaleAll. Create a single variant with the default settings and the font size will be scaled up on larger devices.

red30 said:

Also, in the settings of some devices, you can change the font size, how will this affect the font size of the application?

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It will increase the font size. You can disable it, though it is usually a bad idea.

Erel said:

In most cases you don't need to do anything else other then to use AutoScaleAll. Create a single variant with the default settings and the font size will be scaled up on larger devices.

Click to expand...

And initially, for what size screen to set the font size? For example, if I install a font for a 7 "tablet and write 222 in 111, then will the font adjust itself for 5" and 10 "devices?

The default variant is close to a 4'' phone.