How to limit Android edit text field only for some selected characters

Question

Is there any way to limit users allowed to type only some selected character set (Eg: A or B or C or D) in Android layout.xml

Answer 1

Use the digits attribute, only the characters passed to digits will be allowed in the EditText.

android:digits="abc123"

And yes, "digits" is a misleading name, it accepts letters and symbols too.

Answer 2

You can use the inputType attribute:

   <EditText android:id="@+id/edit_text_id"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:inputType="number" />

Possible Values for android:inputType attribute in edit text are: none, text, textCapCharacters, textCapWords, textCapSentences, textAutoCorrect, textAutoComplete, textMultiLine, textImeMultiLine, textNoSuggestions, textUri, textEmailAddress, textEmailSubject, textShortMessage, textLongMessage, textPersonName, textPostalAddress, textPassword, textVisiblePassword, textWebEditText, textFilter, textPhonetic, textWebEmailAddress, textWebPassword, number, numberSigned, numberDecimal, numberPassword, phone, datetime, date, time