Android Utililty Methods File Extension Name Get

List of utility methods to do File Extension Name Get

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Description

The list of methods to do File Extension Name Get are organized into topic(s).

Method

FilechangeExtension(File file, String extensionNew)
Trys to change file's extension to extensionNew. 
Check.arg().validFile(file);
Check.arg().notBlank(extensionNew);
if (extensionNew.contains("."))
    throw new IllegalArgumentException("extensionNew = "
            + extensionNew + " contains a '.' char");
File parent = file.getParentFile();
String nameNew = getNameMinusExtension(file) + "." + extensionNew;
File fileNew = new File(parent, nameNew);
...
StringgetExtension(File file)
Returns the file's extension, defined here as the part of its name after the last '.' 
return getExtension(file, false, false);
StringgetExtension(File file)
get Extension 
int startIndex = file.getName().lastIndexOf(46) + 1;
int endIndex = file.getName().length();
return file.getName().substring(startIndex, endIndex);
StringgetExtension(File file, boolean useFirstPeriod, boolean includePeriod)
Returns the file's extension. 
Check.arg().notNull(file);
String name = file.getName();
int indexPeriod = useFirstPeriod ? name.indexOf('.') : name
        .lastIndexOf('.');
if (indexPeriod == -1)
    return "";
if (!includePeriod)
    indexPeriod += 1;
...
StringgetExtension(String file)
get Extension 
int extPos = file.lastIndexOf('.');
if (extPos != -1 && extPos > file.indexOf(File.separatorChar)) {
    return file.substring(extPos);
return "";
StringgetExtension(String filename)
Return the file extension of the provided filename, or null if one does not exist. 
if (Util.isBlank(filename)) {
    return null;
if (filename.lastIndexOf('.') == -1) {
    return null;
return filename.substring(filename.lastIndexOf('.') + 1);
StringgetExtensionName(String fileName)
get Extension Name 
if ((fileName != null) && (fileName.length() > 0)) {
    int dot = fileName.lastIndexOf('.');
    if ((dot > -1) && (dot < (fileName.length() - 1))) {
        return fileName.substring(dot + 1).toLowerCase();
return "";
StringgetFileEx(String filePath)
get File Ex 
String result = null;
int index = filePath.lastIndexOf(".");
if (index > -1) {
    result = filePath.substring(index + 1, filePath.length());
} else {
    result = "noEx";
return result;
...
StringgetFileExt(String fileFullName)
get File Ext 
int dot = fileFullName.lastIndexOf(".");
if ((dot > -1) && (dot < fileFullName.length() - 1)) {
    return fileFullName.substring(dot + 1);
} else {
    return null;
StringgetFileExtByFileName(String fileName)
get File Ext By File Name 
if (fileName == null)
    return "";
else {
    int idx = fileName.lastIndexOf(".");
    if (idx != -1)
        return fileName.substring(idx + 1);
    else
        return "";
...