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

StringgetSuffix(String f)
get Suffix 
int idx = f.lastIndexOf('.');
if (idx > -1) {
    return f.substring(f.lastIndexOf('.') + 1);
return null;
booleanhasExtension(String filename, String extension)
Returns whether or not the provided filename has the provided extension. 
if (Util.isBlank(extension)) {
    return false;
String fileExtension = getExtension(filename);
if (Util.isBlank(fileExtension)) {
    return false;
return fileExtension.equalsIgnoreCase(extension.replace(".", ""));
...
intindexOfExtension(String filename)
index Of Extension 
if (filename == null) {
    return -1;
int extensionPos = filename.lastIndexOf(".");
int lastSeparator = filename.lastIndexOf("/");
return (lastSeparator > extensionPos ? -1 : extensionPos);
booleanisValidFileExtension(String extension)
Checks if the extension is valid. 
for (int i = 0; i < extension.length(); i++) {
    char c = extension.charAt(i);
    if (!(Character.isDigit(c) || Character.isLetter(c) || c == '_')) {
        return false;
return true;
StringparseFileExtension(String filename)
Parse the filename and return the file extension. 
if (filename == null) {
    return null;
int pos = filename.lastIndexOf('.');
if (pos < 0 || (pos + 1) >= filename.length()) {
    return null;
return filename.substring(pos + 1);
...
StringparseFileExtension(String filename)
Returns the extension of the given filename. 
String ext = null;
if (filename != null) {
    int dot = filename.lastIndexOf('.');
    if (dot > 0 && dot < filename.length()) {
        ext = filename.substring(dot + 1);
return ext;
...
StringremoveExtension(String file)
remove Extension 
int extPos = file.lastIndexOf('.');
if (extPos != -1 && extPos > file.indexOf(File.separatorChar)) {
    file = file.substring(0, extPos);
return file;
StringremoveExtension(String s)
Removes the path and extension from the input 
String separator = System.getProperty("file.separator");
String filename;
int lastSeparatorIndex = s.lastIndexOf(separator);
if (lastSeparatorIndex == -1) {
    filename = s;
} else {
    filename = s.substring(lastSeparatorIndex + 1);
int extensionIndex = filename.lastIndexOf(".");
if (extensionIndex == -1) {
    return filename;
return filename.substring(0, extensionIndex);
StringgetExtension(final String fileName)
get Extension 
return fileName.substring(fileName.lastIndexOf(".") + 1)
        .toLowerCase();
StringgetFileExtenSion(File file)
get File Exten Sion 
String ex;
String filename;
try {
    filename = file.getName();
    ex = filename.substring(filename.lastIndexOf(".") + 1);
} catch (Exception e) {
    return "";
return ex.toLowerCase(Locale.getDefault());