How do I calculate and set the correct textsize of a TextView?

Question

I have a table with a header row coded in the xml file. I set the TextSize attribute of the TextView inside it to 20dp. Now I want to add textview programmatically with the same textSize, but when I use tv.setTextSize(20)they are litte bigger. I tried tv.setTextSize(20 / ((float) getResources().getDisplayMetrics().densityDpi / DisplayMetrics.DENSITY_DEFAULT)); but that way is too small. What's the correct way to do it?

Answer 1

You have to declare your textview size in dps inside app/res/values/dimen.xml folder

<dimen name="text_size_20_dp">20dp</dimen>

Java:

textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, 
                     getResources().getDimension(R.dimen.text_size_20_dp));

Kotlin:

textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,
            resources.getDimension(R.dimen.text_size_20_dp))