Scroll not working for multiple RecyclerView in BottomSheet

Question

I implemented BottomSheet using the DialogFragment approach. I have a TabLayout and ViewPager in the BottomSheet

Answer 1

You not need to extends StatisticFragment as ViewPagerBottomSheetDialogFragment or no need to use any Library for that.

It's you code i have just made some changes in your Static Fragment related to View Pager.

Here is the Statistic Fragment in which i have made changes.

There is not any bugs as stated in all above Answers.

Replace this code with your old Static fragment only not any other changes it will give you the Desired output.

I have just made changes around with your View Pager only and made it working as you want. used OnPageChangeListener method just get that view.

Statistic Fragment.java

    public class StatisticFragment extends BottomSheetDialogFragment {

        private BottomSheetBehavior mBehavior;
        private TabLayout tabLayout;
        private ViewPager viewPager;

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
            View rootView = View.inflate(getContext(), R.layout.sheet_main, null);

            viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
            tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
            if (viewPager != null && tabLayout != null) {
                initViewPager();
            }

            final ViewPager.OnPageChangeListener pageChangeListener = new ViewPager.OnPageChangeListener() {

                @Override
                public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                }

                @Override
                public void onPageSelected(int arg0) {
                    // TODO Auto-generated method stub
                    View view = viewPager.findViewWithTag(arg0);
                    if (view == null) {
                        return;
                    }
                    CustomPagerAdapter adapter = new CustomPagerAdapter(getContext());
                    viewPager.setAdapter(adapter);
                    viewPager.setOffscreenPageLimit(10);
                    tabLayout.setupWithViewPager(viewPager);
                }

                @Override
                public void onPageScrollStateChanged(int state) {

                }
            };

            viewPager.addOnPageChangeListener(pageChangeListener);
            viewPager.post(new Runnable() {
                @Override
                public void run() {
                    pageChangeListener.onPageSelected(viewPager.getCurrentItem());
                }
            });


            dialog.setContentView(rootView);
            mBehavior = BottomSheetBehavior.from((View) rootView.getParent());
            return dialog;


        }

        private void initViewPager() {
            CustomPagerAdapter adapter = new CustomPagerAdapter(getContext());
            viewPager.setAdapter(adapter);
            viewPager.setOffscreenPageLimit(10);
            tabLayout.setupWithViewPager(viewPager);

        }

        @Override
        public void onStart() {
            super.onStart();
            //mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            //mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        }

        public class ServiceVideHolder extends RecyclerView.ViewHolder {
            protected ViewGroup mItemView;
            protected TextView mNameView;
            protected TextView mCodeView;

            public ServiceVideHolder(View v) {
                super(v);
                //rootView = v;
                mItemView = (ViewGroup) v.findViewById(R.id.item);
                mNameView = (TextView) v.findViewById(R.id.main_text);
                mCodeView = (TextView) v.findViewById(R.id.sub_text);
            }
        }

        public class ItemViewHolder extends RecyclerView.ViewHolder {
            protected TextView mMainText;
            protected TextView mSubText;

            public ItemViewHolder(View v) {
                super(v);
                mMainText = (TextView) v.findViewById(R.id.main_text);
                mSubText = (TextView) v.findViewById(R.id.sub_text);
            }
        }

        public class ItemAdapter extends RecyclerView.Adapter {
            private List items;

            public ItemAdapter(List items) {
                this.items = items;
            }

            @Override
            public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
                View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
                return new ItemViewHolder(view);
            }

            @Override
            public void onBindViewHolder(final ItemViewHolder viewHolder, final int position) {
                final Item item = items.get(position);
                viewHolder.mMainText.setText(item.name);
                viewHolder.mSubText.setText(item.value);
                viewHolder.mMainText.setTextColor(ResourcesCompat.getColor(getResources(), position % 2 == 0 ? R.color.md_red_500 : R.color.md_blue_500, null));
            }

            @Override
            public int getItemCount() {
                return items.size();
            }
        }

        class ViewPagerAdapter extends FragmentPagerAdapter {
            private final List mFragmentList = new ArrayList<>();
            private final List mFragmentTitleList = new ArrayList<>();

            public ViewPagerAdapter(FragmentManager manager) {
                super(manager);
            }

            @Override
            public Fragment getItem(int position) {
                return mFragmentList.get(position);
            }

            @Override
            public int getCount() {
                return mFragmentList.size();
            }

            public void addFrag(Fragment fragment, String title) {
                mFragmentList.add(fragment);
                mFragmentTitleList.add(title);
            }

            @Override
            public CharSequence getPageTitle(int position) {
                return mFragmentTitleList.get(position);
            }
        }

        public class CustomPagerAdapter extends PagerAdapter {

            private Context mContext;

            public CustomPagerAdapter(Context context) {
                mContext = context;
            }

            @Override
            public Object instantiateItem(ViewGroup collection, int position) {
                //CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
                LayoutInflater inflater = LayoutInflater.from(mContext);
                ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.adapter, collection, false);
                rootView.setTag(position);


                Toast.makeText(mContext, "Inside Instanciate Item", Toast.LENGTH_SHORT).show();

                //View rootView = View.inflate(getContext(), R.layout.adapter, null);
                final RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
                ArrayList items = new ArrayList<>();

                if (position == 0) {
                    items.add(new Item("Coffee 1", "1"));
                    items.add(new Item("Coffee 2", "2"));
                    items.add(new Item("Coffee 3", "3"));
                    items.add(new Item("Coffee 4", "4"));
                    items.add(new Item("Coffee 5", "5"));
                    items.add(new Item("Coffee 6", "6"));
                    items.add(new Item("Coffee 7", "7"));
                    items.add(new Item("Coffee 8", "8"));
                    items.add(new Item("Coffee 9", "9"));
                    items.add(new Item("Coffee 10", "10"));
                } else {
                    items.add(new Item("Milk 1", "1"));
                    items.add(new Item("Milk 2", "2"));
                    items.add(new Item("Milk 3", "3"));
                    items.add(new Item("Milk 4", "4"));
                    items.add(new Item("Milk 5", "5"));
                    items.add(new Item("Milk 6", "6"));
                    items.add(new Item("Milk 7", "7"));
                    items.add(new Item("Milk 8", "8"));
                    items.add(new Item("Milk 9", "9"));
                    items.add(new Item("Milk 10", "10"));
                }

                final ItemAdapter mAdapter = new ItemAdapter(items);

                mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
                mRecyclerView.setNestedScrollingEnabled(false);
                mRecyclerView.setAdapter(mAdapter);
                Paint paint = new Paint();
                paint.setStrokeWidth(1);
                paint.setColor(ResourcesCompat.getColor(getResources(), R.color.md_grey_500, null));
                paint.setAntiAlias(true);
                paint.setPathEffect(new DashPathEffect(new float[]{25.0f, 25.0f}, 0));
                mRecyclerView.addItemDecoration(new HorizontalDividerItemDecoration.Builder(getActivity()).showLastDivider().paint(paint).build()); //.marginResId(R.dimen.leftmargin, R.dimen.rightmargin)

                collection.addView(rootView);


                return rootView;
            }

            @Override
            public void destroyItem(ViewGroup collection, int position, Object view)    {
                collection.removeView((View) view);
            }

            @Override
            public int getCount() {
                return 2;
            }

            @Override
            public boolean isViewFromObject(View view, Object object) {
                return view == object;
            }

            @Override
            public CharSequence getPageTitle(int position) {
                //CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
                return position == 0 ? "Coffee" : "Milk";
            }

        }
    }

It's Done.