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Editorial Team
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Asked: 2026-05-20T08:18:05+00:00

I have an XML layout file that contains an EditText and a Button .

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I have an XML layout file that contains an EditText and a Button. I would like to display the following validation message to provide feedback to the user:

You must enter 4 numbers

What’s the best way to go about accomplishing this?

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1 Answer

  1. Editorial Team

    From my experience, this is the best way:

    EditText yourEditText;

// when you detect an error:
yourEditText.setError("Input must be 4 digits and numeric");

    The result is:

    enter image description here

    Also, if the input must be numeric, use android:inputType="numberSigned" in the EditText definition. That way the device won’t allow the user to put non-numeric values; even better, it will show a special keyboard to do so:

    enter image description here

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