How can I make ChiralCode - Android-Color-Picker appear in a dialog window ?

I found the following link 'http://ift.tt/1And4TY'. I copied ColorPicker.java and ColorPickerDialog.java. I've been trying for a couple of hours to make that dialog box appear somehow .. but I still can't figure it out. If you run the initial app you can see that it has a color picker dialog button(when you press it that window appears). How can I make something like that?

I tried using this `ColorPickerDialog colorPickerDialog = new ColorPickerDialog(this, initialColor, new OnColorSelectedListener() {

    @Override
    public void onColorSelected(int color) {
        // do action
    }

});
colorPickerDialog.show();` 

but I get a lot of errors. I only copied those 2 java files, nothing else. Not even the layout or something like that. What else should I copy in order to make it work ? I'm using Android Studio