How To Limit Android Edit Text Field Only For Some Selected Characters

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

Solution 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.

Solution 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

Solution 3:

This android:digit will allow only the digits and alphabets you want to be filled in EditText.

<EditTextandroid:inputType="text"android:digits="0123456789*qwertzuiopasdfghjklyxcvbnm,_,-"android:hint="Only letters, digits, _ and - allowed"
    />

Solution 4:

You can set your EditText Field like this...

<EditTextandroid:inputType="text"android:digits="THE SELECTED CHARACTERS THAT USERS ARE ALLOWED TO TYPE" 
/>

By listing the selected characters (A,B,C,and D) that users are allowed to type in the android:digits, you are limiting the possible characters that users can type. This is the easiest way I've learned through searching.