Get image from SDcard filter using startWith

I'm stack with how to get image from SDcard folder which image name start with ("2.") here is my code:

    if (file.isDirectory()) {
        listFile = file.listFiles();
        // Create a String array for FilePathStrings
        FilePathStrings = new String[listFile.length];
        // Create a String array for FileNameStrings
        FileNameStrings = new String[listFile.length];

        for (int i = 0; i < listFile.length; i++) {
            // Get the path of the image file
            FilePathStrings[i] = listFile[i].getAbsolutePath();
            // Get the name image file
            FileNameStrings[i] = listFile[i].getName();
        }
    }