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Q&A

What does android:ems do?

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What does ems in xml do? I saw that I was using following line in EditText. But, I never thought what it does. I was trying to check what actually it does by removing the line. I couldn't see any difference in my layout.

android:ems="10"

Then I visited attributes.xml (AKA attrs.xml). I saw following lines.

<!-- Hint text to display when the text is empty. -->
<attr name="hint" format="string" />

It wasn't understandable for me. Cause whenever I remove the line then I see no difference. I still can see hints of EditText.

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1 answer

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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. ~ https://www.w3.org/Style/Examples/007/units
SO answer

It actually changes font size depending on screen changes if there was no ems in my code then texts won't look good for bigger screens. But without ems I am using default textSize which is 16sp. I am not changing my screen that's why my text size wasn't changing either. That was the main reason of not to see any changes in layout.

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