How to set text size of textview dynamically for different screens

Question

I am creating a textview and adding to the layout dynamically. I am using textView.setTextSize(18) method to set the text size.I tested it on samsung tablet and found that the font size is too small for this screen then I changed the textsize to 25 but it is too big for an emulator(480*800). My problem is to set text size dynamically so that it fits for all the screens.

but this question title is perfect compared to duplicate – vnshetty Jun 21 '12 at 10:54 — vnshetty, Jun 21 '12 at 10:54

score 303 · Answer 1 · edited Nov 07 '17 at 09:29

303

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.

edited Nov 07 '17 at 09:29

android developer

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answered Feb 29 '12 at 05:38

MKJParekh

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I think your answer is not good. Better use value from dimens.xml – Yura Shinkarev Jan 28 '16 at 10:43

blessanm86 · Accepted Answer · 2012-02-29T10:20:56.800

168

You should use the resource folders such as

values-ldpi
values-mdpi
values-hdpi

And write the text size in 'dimensions.xml' file for each range.

And in the java code you can set the text size with

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

Sample dimensions.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="textsize">15sp</dimen>
</resources>

edited Feb 29 '12 at 10:20

answered Feb 29 '12 at 05:37

blessanm86

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can you give me an example to write dimensions.xml file – Nishant Feb 29 '12 at 05:39
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Probably no need for the DPI qualifier if the dimension is specified in sp as they are scaled by the screen density (and user preferred font size). – Justin Mclean Jan 19 '13 at 02:07
Isn't DP better than SP? Will the above work for this issue: http://stackoverflow.com/questions/18497760/having-an-issue-with-textsize-within-textview – Si8 Aug 28 '13 at 21:04
ITs also worked with `dimens.xml` – Pratik Butani Sep 18 '13 at 05:42
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text size looks very large with this method. – zdd Jan 28 '16 at 12:20
39

Actually, you need textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(R.dimen.textsize)); – radu122 Mar 26 '16 at 23:20

Justin Mclean · Answer 3 · 2013-11-05T23:53:13.093

There is probably no need to use the ldpi , mdpi or hdpi qualifiers in this case.

When you define a dimension in a resource file you include the measurement unit. If you use sp units they are scaled according to the screen density so text at 15sp should appear roughly the same size on screens of differing density.
(The real screen density of the device isn't going to exactly match as Android generalises screen density into 120, 160, 240, 320, 480 and 640 dpi groups.)

When calling getResources().getDimension(R.dimen.textsize) it will return the size in pixels. If using sp it will scaled by the screen density,

Calling setText(float) sets the size in sp units. This is where the issue is,
i.e you have pixels measurements on one hand and sp unit on the other to fix do this:

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

Note you can also use

getResources().getDimensionPixelSize(R.dimen.textSize);

instead of getDimension() and it will round and convert to an non fractional value.

NagarjunaReddy · Answer 4 · 2019-11-19T13:18:09.430

50

After long time stuck this issue, finally solved like this

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

create folder like this res/values/dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

  <dimen name="textsize">8sp</dimen>

 </resources>

edited Nov 19 '19 at 13:18

answered Nov 14 '13 at 06:36

NagarjunaReddy

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Why TypedValue.COMPLEX_UNIT_PX and now TypedValue.COMPLEX_UNIT_SP? – portfoliobuilder Jul 06 '15 at 01:07
Where exactly we need to create dimen folder? – Sudarshan Taparia Nov 14 '19 at 04:46
@SudarshanTaparia create folder here res/values/dimens.xml and add your text size. – NagarjunaReddy Nov 19 '19 at 13:21

PrincessLeiha · Answer 5 · 2012-08-09T08:15:39.183

4

In Style.xml pre-define the style:

<style name="largeText">
    <item name="android:textAppearance">@android:style/TextAppearance.Large.Inverse</item>
    <item name="android:textStyle">bold</item>
</style>

in code:

text.setTextAppearance(context, R.style.largeText);

edited Aug 09 '12 at 08:15

answered Feb 29 '12 at 06:17

PrincessLeiha

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How do you customize the size measurement of largeText? – IgorGanapolsky Oct 29 '15 at 23:00

score -2 · Answer 6 · answered Feb 29 '12 at 05:38

-2

I think You should use the textView.setTextSize(float size) method to set the size of text. textView.setText(arg) used to set the text in the Text View.

answered Feb 29 '12 at 05:38

Om Narain Shukla

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Android Text size will be always specifying in sp, not in dp or float values – Jijo Thomas Jun 13 '16 at 06:38

score -8 · Answer 7 · answered Aug 05 '14 at 13:32

-8

float currentSize = textEdit.getTextSize(); // default size
float newSize = currentSize * 2.0F; // new size is twice bigger than default one
textEdit.setTextSize(newSize);

answered Aug 05 '14 at 13:32

trunikov

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I don't see any consideration for the screen size in this answer. – Lay González Sep 10 '14 at 15:49
In my opinion the question is about font size. So I don't understand why you complain about absence of references to sceen size. Default font has appropriate size in most of cases. So it is better to think about font size in terms of bigger/smaller default size, i.e. independetly of screen size. So I wrote a solution which can be used to set font size relative to default font size. – trunikov Sep 19 '14 at 12:39

How to set text size of textview dynamically for different screens

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