Android text-size programmatically too big

Question

I have two szenarios:

First:

 textView.setTextSize(getResources().getDimension(R.dimen.defaultTextSize));

Second in xml:

android:textSize="@dimen/defaultTextSize"

in values/dimen.xml i have declared defaultTextSize with 20sp

In my first case the text is much bigger (and different in some screenresulutions) than in my second case. Why? Have I done a mistake?

Rohit5k2 · Accepted Answer · 2016-01-19T09:13:13.660

27

setTextSize() takes unit as pixel

Use this

public float pixelsToSp(float px) 
{
    float scaledDensity = _context.getResources().getDisplayMetrics().scaledDensity;
    return px/scaledDensity;
}

textView.setTextSize(pixelsToSp(getResources().getDimension(R.dimen.defaultTextSize)));

or

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

edited Jan 19 '16 at 09:13

answered Jan 21 '15 at 16:05

Rohit5k2

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2

Absolutely no clue why, but the second recommendation does not work on my GalaxyS4. Oi Vey Android...but solution 1 worked, so thanks. – Chris Sprague May 07 '15 at 02:02
3

@Kufuma it doesn't work because it's wrong: should be `COMPLEX_UNIT_PX` instead of `COMPLEX_UNIT_SP`. See also Blackbelt's answer in this page. – Giulio Piancastelli Nov 27 '15 at 10:40

score 16 · Answer 2 · answered Jan 21 '15 at 16:04

The implementation of setTextSize(float size)

public void setTextSize(float size) {
    setTextSize(TypedValue.COMPLEX_UNIT_SP, size);
}

What is happening, in your case, is that you are scaling the value you provided to setTextSize, since getDimension returns the dimension multiplied by the metric. Try with

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

score 2 · Answer 3 · answered Mar 02 '22 at 04:56

2

Add the size in dimens.xml

   <dimen name="text_medium">18sp</dimen>

Then, use the following to set the size wherever you want

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

answered Mar 02 '22 at 04:56

Sonu Sourav

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score 1 · Answer 4 · answered Jan 21 '15 at 16:06

1

Have you tried using

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

answered Jan 21 '15 at 16:06

Braunster

466
4
6

score 0 · Answer 5 · answered Jan 21 '15 at 16:05

0

TextView uses Resources.getDimensionPixelSize method, not Resources.getDimension for textSize.

answered Jan 21 '15 at 16:05

Volodymyr Baydalka

3,635
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Android text-size programmatically too big

5 Answers5