In fragment ripple not working

[arpit999bicubic]

I used this code see my fragment. My app is not crash but ripple effect not work please help me. What should i do??

public class HomeFragment extends Fragment implements View.OnClickListener {

   View bt_next, bt_previous,bt_book_ticket;
   View rootView;
   ClickableViewPager viewPager;

   public HomeFragment() {
       // Required empty public constructor
   }

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

   }


   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
                            Bundle savedInstanceState) {
       rootView = inflater.inflate(R.layout.fragment_home, container, false);

       FindIDs();

       viewPager.setOnItemClickListener(new ClickableViewPager.OnItemClickListener() {
           @Override
           public void onItemClick(int position) {

               Toast.makeText(getActivity(), "Position : "+position, Toast.LENGTH_SHORT).show();

               switch (position){

                   case 0:
                       startActivity(new Intent(getActivity(), AmazingRidesActivity.class));
                       break;
                   case 1:
                       startActivity(new Intent(getActivity(), FoodBeveragesActivity.class));

                       break;
                   case 2:
                       startActivity(new Intent(getActivity(), XochiActivity.class));
                       break;

                   default:

                       break;

               }


           }
       });


       // Inflate the layout for this fragment
       return rootView;
   }

   @Override
   public void onAttach(Context context) {
       super.onAttach(context);

       Activity a;

       if (context instanceof Activity) {
           a = (Activity) context;
       }

   }

   @Override
   public void onDetach() {
       super.onDetach();
   }

   @Override
   public void onClick(View v) {

       switch (v.getId()) {

           case R.id.bt_next:

               viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);

               break;
           case R.id.bt_previous:

               viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);

               break;

           case R.id.bt_book_ticket:

               startActivity(new Intent(getActivity(), SelectDateActivity.class));

               break;
           default:


               break;


       }
   }

   public void FindIDs(){

       viewPager = (ClickableViewPager) rootView.findViewById(R.id.viewpager);
       viewPager.setAdapter(new CustomPagerAdapter(getActivity()));

       bt_next =  rootView.findViewById(R.id.bt_next);
       bt_previous =  rootView.findViewById(R.id.bt_previous);
       bt_book_ticket = rootView.findViewById(R.id.bt_book_ticket);

       MaterialRippleLayout.on(bt_next)
               .rippleColor(Color.parseColor("#FF0000"))
               .rippleAlpha(0.2f)
               .rippleHover(true)
               .create();

       MaterialRippleLayout.on(bt_previous)
               .rippleColor(Color.parseColor("#FF0000"))
               .rippleAlpha(0.2f)
               .rippleHover(true)
               .create();

       MaterialRippleLayout.on(bt_book_ticket)
               .rippleColor(Color.parseColor("#FF0000"))
               .rippleAlpha(0.2f)
               .rippleHover(true)
               .create();

       bt_next.setOnClickListener(this);
       bt_previous.setOnClickListener(this);
       bt_book_ticket.setOnClickListener(this);

   }

}