How to determine file types in Android

What is the best way to determine a file type in Android?

I want to check if the given file is an image, a music file, etc.

Asked by: Nicole462 | Posted: 25-01-2022

Answer 1

Include some mime.types files in your assets folder (for example from /etc/mime.types).
Include activation.jar (from JAF) in your build path.

Use something like this:

try {
    MimetypesFileTypeMap mftm = 
        new MimetypesFileTypeMap(getAssets().open("mime.types"));
    FileTypeMap.setDefaultFileTypeMap(mftm);
} catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

Then use FileDataSource.getContentType() to obtain file types.

Answered by: Adelaide463 | Posted: 26-02-2022

Answer 2

public static String getMimeType(String fileUrl) {
    String extension = MimeTypeMap.getFileExtensionFromUrl(fileUrl);
    final String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    return (mimeType !=  null) ? mimeType : "unknown";
}

Answered by: Alberta968 | Posted: 26-02-2022

Answer 3

A common way is by their extension only, or you can parse the header, but it should be too much slower and more complex for your apps.

Answered by: Brad577 | Posted: 26-02-2022

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