Allow user to set font size, font color, background color for android app

Question

I want to allow user to choose font size/color, background color for whole app.

For that, I am getting his preferred values and saving them in default shared preferences provided by android.

But what can be best way to use these values for complete app ?

I tried using it on each activity basis. this approach is mentioned in not-able-to-set-theme-to-android-activity which is not working.

Request you all to pls guide.

Answer 1

Please try it.

textview.setTextAppearance(mContext, R.style.boldText);