How to determine MIME type of file in android?

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Suppose I have a full path of file like:(/sdcard/tlogo.png). I want to know its mime type.

I created a function for it 

public static String getMimeType(File file, Context context)    
{
    Uri uri = Uri.fromFile(file);
    ContentResolver cR = context.getContentResolver();
    MimeTypeMap mime = MimeTypeMap.getSingleton();
    String type = mime.getExtensionFromMimeType(cR.getType(uri));
    return type;
}

but when i call it, it returns null.

File file = new File(filePath);
String fileType=CommonFunctions.getMimeType(file, context);

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