Android textinput where the user can write digits and '/' [duplicate]

问题

This question already has answers here:

Validation allow only number and characters in edit text in android (8 answers)

How to restrict the EditText to accept only alphanumeric characters (12 answers)

EditText which accepts only a few characters (7 answers)

Closed last year.

My user has to enter a string like 21/99 where digits and the sign / are the only valid signs that the user can enter, ideally those would all be shown on the keyboard and little other signs. Unfortunately, neither number nor text not any other type I found produces in such an UI. Is there a way where I can make it easy for my user to enter such numbers.

回答1:

Use android:digits="1234567890/" in EditText

android:digits

• If set, specifies that this TextView has a numeric input method and that these specific characters are the ones that it will accept. If this is set

SAMPLE CODE

<EditText
    android:layout_width="match_parent"
    android:digits="1234567890/"
    android:inputType="text"
    android:layout_height="wrap_content" />

回答2:

you can try to use Androids/Javas Regular Expressions

If you go with RegEx, you will be able to PREVENT a user to type in everything you dont want him to, e.g. everything that is not a digit (d) or the char "/". So this will solve your problem if you want to do the thinking for your users.

Alternative you can prevent that like answered above with restrictions in XML <EditText/> if you dont want to do in your Java-Class

来源：https://stackoverflow.com/questions/52203810/android-textinput-where-the-user-can-write-digits-and