Android File Extension Name Get getExtension(String filename)

Description

Return the file extension of the provided filename, or null if one does not exist.

License

Apache License

Return

The file extension of the provided filename, or null if none exists

Declaration

public static String getExtension(String filename) 

Method Source Code

/*******************************************************************************
 * Copyright 2012 Geoscience Australia/*from w  ww  . j  av a  2s  . c o  m*/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/


public class Main{
    /**
     * Return the file extension of the provided filename, or <code>null</code> if
     * one does not exist.
     * <p/>
     * A file extension if defined as anything after the last period '.'
     * <p/>
     * The returned extension does <b>not</b> include the '.' character. 
     * 
     * @return The file extension of the provided filename, or <code>null</code> if none exists
     */
    public static String getExtension(String filename) {
        if (Util.isBlank(filename)) {
            return null;
        }

        if (filename.lastIndexOf('.') == -1) {
            return null;
        }

        return filename.substring(filename.lastIndexOf('.') + 1);
    }
}

Related

1. changeExtension(File file, String extensionNew)
2. getExtension(File file)
3. getExtension(File file)
4. getExtension(File file, boolean useFirstPeriod, boolean includePeriod)
5. getExtension(String file)
6. getExtensionName(String fileName)
7. getFileEx(String filePath)
8. getFileExt(String fileFullName)
9. getFileExtByFileName(String fileName)