public abstract class RegisterStep {

     public interface OnNextActionListener {

         void next();

         void submit();

     }

     protected Activity mActivity;

     protected Context mContext;

     private View mContentView;

     protected OnNextActionListener mOnNextActionListener;

     public RegisterStep(Activity activity, View contentView) {

         mActivity = activity;

         mContext = (Context) mActivity;

         mContentView = contentView;

         initViews();

         initEvents();

     }

     public abstract void initViews();

     public abstract void initEvents();

     public abstract boolean validate();

     public View findViewById(int id) {

         return mContentView.findViewById(id);

     }

     public void doPrevious() {

     }

     public void doNext() {

         mOnNextActionListener.submit();

     }

     public void nextAnimation() {

     }

     public void preAnimation() {

     }

     public void setOnNextActionListener(OnNextActionListener onNextActionListener) {

         mOnNextActionListener = onNextActionListener;

     }

 }