Android Development Settings Password can only enter the combination of letters and numbers

Whether it is a computer or mobile phone and other electronic devices, in the input password will always need to do some restrictions, such as can not enter a space, can not enter the illegal characters of exotic flowers, can not enter less than a few passwords, not too simple, and so on.

In the EditText settings often need to add some input filters, listening to what, but EditText actually have a very simple attribute, as long as a line of code can be set to EditText can only enter the content, you can exclude all illegal characters.

Android:digits= "0123456789abcdefghigklmnopqrstuvwxyzQWERTYUIOPASDFGHJKLZXCVBNM"

This property means that you can only enter numbers, lowercase letters, and capitals.