Set EditText Digits Programmatically

Try this:

<EditText
    android:inputType="number"
    android:digits="0123456789."
/>

From Code:

weightInput.setKeyListener(DigitsKeyListener.getInstance("0123456789."));

But, it allows the user to include several "." See JoeyRA's answer for real numbers.

Try this:

weightInput.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);           
weightInput.setKeyListener(DigitsKeyListener.getInstance(false,true));

---

public static DigitsKeyListener getInstance (boolean sign, boolean decimal) 

Returns a DigitsKeyListener that accepts the digits 0 through 9, plus the minus sign (only at the beginning) and/or decimal point (only one per field) if specified.

This solve the problem about the many '.' in EditText