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

User · Answer

float currentSize   textEdit getTextSize       default size float newSize   currentSize   2 0F     new size is twice bigger than default one textEdit setTextSize newSize

User · Answer

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   lt  xml version  1 0  encoding  utf-8   gt   lt resources gt       lt dimen name  textsize  gt 15sp lt  dimen gt   lt  resources gt

User · Answer

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

User · Answer

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   lt  xml version  1 0  encoding  utf-8   gt   lt resources gt      lt dimen name  textsize  gt 8sp lt  dimen gt     lt  resources gt

User · Answer

In Style xml pre-define the style    lt style name  largeText  gt       lt item name  android textAppearance  gt  android style TextAppearance Large Inverse lt  item gt       lt item name  android textStyle  gt bold lt  item gt   lt  style gt    in code   text setTextAppearance context  R style largeText

User · Answer

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

User · Answer

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

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

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