[android] How to assign text size in sp value using java code

Thanks @John Leehey and @PeterH:

desiredSp = getResources().getDimension(R.dimen.desired_sp);
density = getResources().getDisplayMetrics().density;
textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, desiredSp / density);

The thing is if you define R.dimen.desired_sp to 25 in your dimen.xml

  1. On non-HD Device: desiredSp is still 25, density = 1
  2. On HD Device(like Nexus 7 2nd Generation): desiredSp becomes 50 ish, density = 2

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