array of numbers, random arrangement

I have this class which basically is a custom keyboard. now I have to implement it in a new screen and I need to reuse the same class to make the numbers appear randomly, each time, in a different layout .. for security reasons.

in practice I should reuse the variables "key1" "key2" "key3" etc, randomly allocated for a given screen where I need

    private TextView key1, key2, key3, key4, key5, key6, key7, key8, key9, key0;
private TextView txtAdditionaLink, message;
private LinearLayout lytAdditionalLinkContainer;
public CustomPinKeyboard(Context context, AttributeSet attrs) throws PinViewInitializationException {

    super(context, attrs);

    this.context = context;
    mAttrs = attrs;
    init();
}

private void init() throws PinViewInitializationException {

    log(TAG, "init called");

    searchForCustomAttributes(mAttrs);
    if(changePin){
         //[key0,key1,key2,key3,key4,key5,key6,key7,key8,key9]

    }

    switch (numberOfDigit){

        case 0:
            inflate(getContext(), R.layout.keyboard_without_pin_layout, this);
            break;
        case 4:
            inflate(getContext(), R.layout.keyboard_with_four_pin_layout, this);
            break;
        case 5:
            inflate(getContext(), R.layout.keyboard_with_five_pin_layout, this);
            break;
        case 6:
            inflate(getContext(), R.layout.keyboard_with_six_pin_layout, this);
            break;
    }

    message = (TextView) findViewById(R.id.pin_point_text_view);
    txtAdditionaLink = (TextView) findViewById(R.id.pin_additional_link_text_view);
    lytAdditionalLinkContainer = (LinearLayout) findViewById(R.id.pin_additional_link_container);

    pinMask = (LinearLayout) findViewById(R.id.pin_mask);

    setKeyboardTitle();
    evaluateAdditionlLink();
    initPin();
    initKey();
}