In the most situation, XML file is case-insensitive. I thought that is the same case as Android Layout XML. There is no different between and . There is a run-time exception thrown about the invalid "" element. I changed to . Then everything is fine. I… more »

I tried to use JQuery Validation. That is the easiest form validation library!!!!! I just need to include the jquery library and its js file. Then I add these code in $(document).ready Code$([form element]).validate({rules: {   [field name]:… more »