Only show number buttons on Soft Keyboard in Android?

You must only add this line on your code:

input.setRawInputType(Configuration.KEYBOARD_12KEY);

this will show only the numeric keyboard.

android:inputType="phone"
android:digits="1234567890"

is an option

The accepted answer did not work for me (tested on OnePlus 3t and Samsung Galaxy S6/S7 phones).

This solution uses numberPassword but overrides the default transformation method for the EditText to show characters instead of showing dots.

<EditText
    android:id="@+id/userid"
    android:inputType="numberPassword"
    android:maxLength="6"
/>

// Numeric 6 character user id
EditText input = findViewById(R.id.userid);

// Process input and show characters instead of dots
input.setTransformationMethod(SingleLineTransformationMethod.getInstance());

The phone number pad is the closest thing I've found (set inputType="phone" on your EditText).