Shulou(Shulou.com)06/01 Report--

This article mainly shows you "Kotlin how to use isNullOrEmpty | isNullOrBlank", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "Kotlin how to use isNullOrEmpty | isNullOrBlank" this article.

IsNullOrEmpty | isNullOrBlank

We need to validate multiple times when developing Android applications. If you don't use Kotlin to deal with this problem, you may have found the TextUtils class in Android.

If (TextUtils.isEmpty (name)) {/ / alert the user!} public static boolean isEmpty (@ Nullable CharSequence str) {return str = = null | | str.length () = = 0;}

If the name is all spaces, then the TextUtils.isEmpty is not satisfied for use. Then isNullorBlank is available.

Public inline fun CharSequence?.isNullOrEmpty (): Boolean = this = = null | | this.length = = 0public inline fun CharSequence?.isNullOrBlank (): Boolean = this = = null | | this.isBlank () / / If we do not care about the possibility of only spaces...if (number.isNullOrEmpty ()) {/ / alert the user to fill in their number!} / / when we need to block the user from inputting only spacesif (name.isNullOrBlank ()) {/ / alert the user to fill in their name!} above is Kotlin How to use isNullOrEmpty | isNullOrBlank all the contents of this article Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.