Java Android TextUtils isEmpty 与 String.isEmpty
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Android TextUtils isEmpty vs String.isEmpty
提问by Suri
What is difference between TextUtils.isEmpty(string)and string.isEmpty?
TextUtils.isEmpty(string)和 和有什么不一样string.isEmpty？
Both do the same operation.
两者都做同样的操作。
Is it advantageous to use TextUtils.isEmpty(string)?
使用有好处TextUtils.isEmpty(string)吗？
回答by OneCricketeer
Yes, TextUtils.isEmpty(string)is preferred.
是的，TextUtils.isEmpty(string)是首选。
For string.isEmpty(), a null string value will throw a NullPointerException
对于string.isEmpty()，空字符串值将抛出NullPointerException
TextUtilswill always return a boolean value.
TextUtils将始终返回一个布尔值。
In code, the former simply calls the equivalent of the other, plus a null check.
在代码中，前者简单地调用了 other 的等价物，再加上一个空检查。
return string == null || string.length() == 0;
回答by Ahmed Mostafa
In class TextUtils
在班上 TextUtils
public static boolean isEmpty(@Nullable CharSequence str) {
if (str == null || str.length() == 0) {
return true;
} else {
return false;
}
}
checks if string length is zero and if string is null to avoid throwing NullPointerException
检查字符串长度是否为零以及字符串是否为空以避免抛出 NullPointerException
in class String
在班上 String
public boolean isEmpty() {
return count == 0;
}
checks if string length is zero only, this may result in NullPointerExceptionif you try to use that string and it is null.
检查字符串长度是否仅为零，NullPointerException如果您尝试使用该字符串并且它为空，这可能会导致。
回答by ΦXoc? ? Пepeúpa ツ
Take a look at the doc
看一下文档
for the String#isEmptythey specify:
对于String#isEmpty他们指定：
boolean
isEmpty() Returns true if, and only if, length() is 0.
boolean
isEmpty() 当且仅当 length() 为 0 时返回 true。
and for the TextUtils.isEmptythe documentation explains:
对于TextUtils.isEmpty文档说明：
public static boolean isEmpty (CharSequence str)
Returns true if the string is null or 0-length.
public static boolean isEmpty (CharSequence str)
如果字符串为空或长度为 0，则返回 true。
so the main difference is that using the TextUtils.isEmpty, you dont care or dont need to check if the string is null referenced or not,
所以主要的区别是使用 TextUtils.isEmpty，你不关心或不需要检查字符串是否为空引用，
in the other case yes.
在另一种情况下是的。
回答by Wackaloon
TextUtils.isEmpty()is better in Android SDK because of inner null check, so you don't need to check string for null before checking its emptiness yourself.
TextUtils.isEmpty()由于内部空检查，在Android SDK中更好，因此您无需在自己检查空值之前检查字符串是否为空。
But with Kotlin, you can use String?.isEmpty()and String?.isNotEmpty()instead of TextUtils.isEmpty()and !TextUtils.isEmpty(), it will be more reader friendly
但是在 Kotlin 中，你可以使用String?.isEmpty()andString?.isNotEmpty()代替TextUtils.isEmpty()and !TextUtils.isEmpty()，它会更友好
So I think it is preferred to use String?.isEmpty()in Kotlin and TextUtils.isEmpty()in Android Java SDK
所以我认为最好String?.isEmpty()在 Kotlin 和TextUtils.isEmpty()Android Java SDK 中使用
回答by Yagna
String?.isNullOrEmpty
might be what you are looking for
可能是您正在寻找的
