Constraints on EditText fields

[staz69uk]

<EditText
android:inputType="textFilter"
android:digits="@string/myAlphaNumeric" />

<string name="myAlphaNumeric">abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789</string>

http://stackoverflow.com/questions/3349121/how-do-i-use-inputfilter-to-limit-characters-in-an-edittext-in-android