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How can i find the extension of files in a specific folder in Android using subString() function in Java? or you can also suggest me the best way to do this.

Rahul Verma
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    Does this answer your question? [How do I get the file extension of a file in Java?](https://stackoverflow.com/questions/3571223/how-do-i-get-the-file-extension-of-a-file-in-java) – enzo May 09 '21 at 18:23

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String fileName = "document.old.pdf";
String extension = fileName.substring(fileName.lastIndexOf(".") + 1); // pdf
Daniel
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