How to set text size of textview dynamically for different screens [duplicate]

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EDIT:
And As I Search on StackOverflow now I found This Question is Duplicate of : This and This

You need to use another function setTextSize(unit, size) with unit SP like this,

tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18f);

Please read more for TypedValue constants.

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