Android: Canvas.drawText() text size on different screen resolutions

The easiest way is to define your font sizes in your resources with the units of scale-independent pixels (sp) — this unit is like density independent pixels (dp or dip) in that it takes into account the screen density but it also takes into account the font-size setting of the user.

To add a new dimension create a dimens.xml file in your res/values folder and enter the following code to add a new dimension with the name myFontSize:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="myFontSize">20sp</dimen>
</resources>

You can then get the text size in your application using

int scaledSize = getResources().getDimensionPixelSize(R.dimen.myFontSize);

The resulting size will be correctly scaled to take into account the current screen density and font-size setting.

For more information see the Android Developers page on More Resources.