xml - What is android:ems in android application design

itemprop="text">

I am new to the android application
development. I am developing an application. While doing design for this app i am stuck
in android:ems. What is this components.

class="post-text" itemprop="text">

class="normal">Answer

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.

em is basically CSS property for
font sizes

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.