如何在EditText中输入“负十进制数”？

Question

I am making a calculator and I want to make sure that user is able to enter a "Negative Decimal Number" I see the option in the xml file separately for example in order to put the Decimal Number, the EditText's inputType must be numberDecimal and for negative number the inputType must be "numberSigned" but I need both. If I choose inputType as "text" then user is able to enter anything which throws an exception if it's not a number. I am not sure how to fix that either.

Answer 1

You can use both with the "|" operator. Just specify "numberSigned|numberDecimal".

Answer 2

Add this in the layout of the EditText :

android:digits="0123456789-."

You can specify more there, for example if you want the user to input sin() functions.

Answer 3

As @a11n says, you can use the pipe operator to specify both:

<EditText
    ...
    android:inputType="numberSigned|numberDecimal"
    ... />

Valid numbers: positive and negative decimal and whole numbers.

Answer 4

Some phones have the decimal and negative in the same button and makes it unable to do negatives. I figured out a way you could separate the buttons by simply adding:

android:inputType="numberSigned|numberDecimal|textPersonName"
android:digits="0123456789.-"

That way you still have the number keyboard layout but the negative and decimal buttons will be separate and you cannot use any other digit that messes up the app.