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What is meant by Ems? (Android TextView)

What is meant by Ems? (Android TextView) 


A1.

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

A2.

      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. In font differ from english it is the width of the widest letter in this font, this      width is different size in pixels then the width size of the M in the english font but it is still 1em.        So if I use text with 12sp in english font 1em is relative to this 12sp english font, using Italian font     with 12sp gives 1em that is differ in pixels width then the english one.

A3.

    TextView ems meaning
   In TextView there is an attribute named android:ems. The description is "Makes the TextView be        exactly this many ems wide"
  Note : but only when the layout_width is set to "wrap_content". Other layout_width values override    the ems width setting.

A4.

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.
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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