What is meant by Ems? (Android TextView)

by

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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