What is meant by Ems Android TextView

Question

What is meant by Ems  related to a TextView   For example in  android ems     setEms int    Makes the TextView be exactly this many ems wide

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em is basically CSS property for font sizes      The em and ex units depend on the font and may be different for each   element in the document  The em is simply the font size  In an element   with a 2in font  1em thus means 2in  Expressing sizes  such as margins   and paddings  in em means they are related to the font size  and if   the user has a big font  e g   on a big screen  or a small font  e g     on a handheld device   the sizes will be in proportion  Declarations   such as text-indent  1 5em and margin  1em are extremely common in   CSS    Source https   www w3 org Style Examples 007 units

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To add to the other answers in Android  Ems size  can  by default  vary in each language and input  It means that if you want to set a minimum width to a text field  defined by number of chars  you have to calculate the Ems properly and set it  according to your typeface and font size with the Ems attribute  To those of you struggle with this  you can calculate the hint size yourself to avoid messing with Ems  val tf   TextField   val layout   TextInputLayout   val hint    quot Hint quot   val measureText   tf paint measureText hint  toInt   tf width   tf paddingLeft   tf paddingRight   measureText toInt   layout hint   hint

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ems is a unit of measurement  The name em was originally a reference to the width of the capital M  It sets the width of a TextView EditText to fit a text of n  M  letters regardless of the actual text extension and text size   Eg    android ems Makes the EditText be exactly this many ems wide    lt EditText     android ems  2    gt    denotes twice the width of letter M is created

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android ems or setEms n  sets the width of a TextView to fit a text of n  M  letters regardless of the actual text extension and text size  See wikipedia Em unit  but only when the layout width is set to  wrap content   Other layout width values override the ems width setting   Adding an android textSize attribute determines the physical width of the view to the textSize   length of a text of n  M s  set above

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While other answers already fulfilled the question  it s a 3 years old question after all   I m just gonna add some info  and probably fixed a bit of misunderstanding  Em  while originally meant as the term for a single  M  character s width in typography  in digital medium it was shifted to a unit relative to the point size of the typeface  font-size or textSize   in other words it s uses the height of the text  not the width of a single  M   In Android  that means when you specify the ems of a TextView  it uses the said TextView s textSize as the base  excluding the added padding for accents diacritics  When you set a 16sp TextView s ems to 4  it means its width will be 64sp wide  thus explained  stefan  s comment about why a 10 ems wide EditText is able to fit 17  M

User · Answer

It is the width of the letter M in a given English font size  So 2em is twice the width of the letter M in this given font  For a non-English font  it is the width of the widest letter in that font  This width size in pixels is different than the width size of the M in the English font but it is still 1em  So if I use a text with 12sp in an English font  1em is relative to this 12sp English font  using an Italian font with 12sp gives 1em that is different in pixels width than the English one

User · Answer

em is the typography unit of font width  one em in a 16-point typeface is 16 points

User · Answer

Ems is a typography term  it controls text size  etc  Check here

[android] What is meant by Ems? (Android TextView)

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