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I would like to know how to make a validation on EditText. For example, I have one EditText that should only accept numeric values. If something other than a numeric value is typed by the user then it should show an alert message (i.e. "please use a numeric value....").
Is there a function available to find out if the entered text is particular type? If possible please include a code snippet.
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In this example, learn how to add validation to a form that has a single text field using the following steps: Create a Form with a GlobalKey . Add a TextFormField with validation logic. Create a button to validate and submit the form.
Validation ensures that only certain values are entered in a field. Validation functionality is available for text and numeric fields. To enable validation, Add a Text or Numeric field to a form in the Builder view.
To validate the form using HTML, we will use HTML <input> required attribute. The <input> required attribute is a Boolean attribute that is used to specify the input element must be filled out before submitting the Form.
Rather than make a pop-up I would integrate a hint into the EditText and I would make it so the user could only type numbers into the EditText (android:numeric, android:hint):
<EditText android:layout_height="wrap_content"
android:numeric="integer"
android:hint="@string/numberHint"
android:gravity="left"
android:id="@+id/name"
android:layout_width="wrap_content"
android:maxWidth="60dp"
android:textSize="6pt">
</EditText>
More information is available here: http://developer.android.com/reference/android/widget/EditText.html
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