Android Utililty Methods String Null Convert

List of utility methods to do String Null Convert

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Description

The list of methods to do String Null Convert are organized into topic(s).

Method

StringtoNonNull(String str)
to Non Null 
return str == null ? "" : str;
StringtoStrNotNull(Object obj, String defaultStr)
to Str Not Null 
String s = (obj == null) ? defaultStr : obj.toString();
return s;
StringconvertToNull(String chaine)
convert To Null 
if ("".equals(chaine) || " ".equals(chaine)
        || "null".equals(chaine) || "NULL".equals(chaine)
        || "Null".equals(chaine)) {
    return null;
return chaine;
StringdefaultIfNull(String str)
default If Null 
return defaultIfNull(str, EMPTY);
StringdefaultIfNull(String str, String defaultStr)
default If Null 
return str == null ? defaultStr : str;
StringdefaultIfBlank(String str, String defaultStr)
default If Blank 
return isBlank(str) ? defaultStr : str;
StringdefaultIfBlank(String str)
default If Blank 
return defaultIfBlank(str, EMPTY);
booleanisEmptyOrWhitespaceOnly(String str)
is Empty Or Whitespace Only 
if (TextUtils.isEmpty(str)) {
    return true;
for (int i = 0; i < str.length(); i++) {
    if (!Character.isWhitespace(str.charAt(i))) {
        return false;
return true;
StringtoStringWhenNull(Object src, String newValue)
to String When Null 
if (src == null) {
    return newValue;
String srcStr = src.toString();
if (srcStr == null) {
    return newValue;
return srcStr;
...
StringtoStringWhenNullOrEmpty(Object src, String newValue)
to String When Null Or Empty 
if (src == null) {
    return newValue;
String srcStr = src.toString();
if ((srcStr == null) || (srcStr.equals(""))) {
    return newValue;
return srcStr;
...