android - How to programmatically change font settings of Device: font style and font size?

Question

How do we change font type and font size programmatically? I am not referring to changing the font style of a textview or editText.

I want to change the global font settings, toggling between font types and font sizes on a button click in my app. I tried checking the Settings.System attributes but I could not find them. Any ideas?

Answer 1

You can change system font using below code

Settings.System.putFloat(getBaseContext().getContentResolver(),
            Settings.System.FONT_SCALE, (float) 1.0);

and after this give permission in menifest file

  <uses-permission android:name="android.permission.WRITE_SETTINGS"/>

and then restart your device to show effect..

Note: Its fully applicable for rooted device and in Unrooted device some font may change and some are not.