Android TextView setTextSize incorrectly increases text size


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Heh, mixed units problem. Seems a little counterintuitive, but it's an easy fix. The default method setTextSize(float) assumes you're inputting sp units (scaled pixels), while the getTextSize() method returns an exact pixel size.

You can fix this by using the alternate setTextSize(TypedValue, float), like so:

this.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);

This will make sure you're working with the same units.

setTextSize() and getTextSize() work with different units. The parameter to set() is density-independent "scaled pixels", whereas get() returns plain old pixels.

pass units with size using TypedValue like below:

TypedValue.COMPLEX_UNIT_PX //Pixels

TypedValue.COMPLEX_UNIT_SP //Scaled Pixels

TypedValue.COMPLEX_UNIT_DIP //Device Independent Pixels

setTextSize(TypedValue.COMPLEX_UNIT_SP, 18)

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