Android Utililty Methods String Empty Check

List of utility methods to do String Empty Check

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Description

The list of methods to do String Empty Check are organized into topic(s).

Method

booleanisEmpty(String string)
is Empty 
if (string == null) {
    return true;
if ("".equals(string)) {
    return true;
return false;
booleanisEmptyString(String s)
is Empty String 
return s.trim().length() == 0;
booleanisEmptyOrNull(String str)
is Empty Or Null 
return str == null || str.length() == 0
        || str.contentEquals("null") || str.trim().equals("");
StringtoNullIfEmptyOrWhitespace(String string)
Returns the given string if it is nonempty and contains at least one non-whitespace character; null otherwise. 
return isEmptyOrWhitespace(string) ? null : string;
StringtoNullIfEmpty(String string)
Old location of Strings#emptyToNull ; this method will be deprecated soon. 
return Strings.emptyToNull(string);
booleanisNullOrEmptyOrOnlyWhitespaces(String string)
Checks is string null or its length == 0 or it contains only whitespaces, very useful 
return isNullOrEmpty(string) ? true : string.trim().length() == 0;
StringnullToEmpty(String url)
Use to normalize URL parameters by returning empty string instead of null or "null". 
if (null == url || url.equals(NULL))
    return EMPTY;
return url;
booleanisEmpty(String s)
Check if string is null or empty. 
if (null == s || s.trim().equals(EMPTY) || s.trim().equals(NULL))
    return true;
return false;
booleanisEmpty(String s)
Implement an isEmpty for API < 9 
return s == null || s.length() == 0;
booleanisEmpty(String str)
is Empty 
return str == null || str.length() == 0;