If you look at the document,
android:ems setEms(int)
It looks like this.
Makes the TextView be exactly this many ems wide.
It's in English, but I don't know what it means.
android android-textview
Android:ems or setEms(n) sets the width of the character to fit the width, regardless of the actual string size. Ems only applies when layout_width is wrap_content.
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