BottomSheet recyclerview

public class MyRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int HEADER = 0;

    private static final int ITEM = 1;

    private List<Integer> versionsList;

    private Context mContext;

    private Button mDelete;

    private Integer mSelectedObject;

    private BottomSheetBehavior mBottomSheetBehavior;

    public MyRecyclerViewAdapter(List<Integer> versionsList, Button mDelete, BottomSheetBehavior mBottomSheetBehavior) {

        this.versionsList = versionsList;

        this.mDelete = mDelete;

        this.mBottomSheetBehavior = mBottomSheetBehavior;

    }

    @Override

    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        if (viewType == HEADER) {

            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.header_layout, parent, false);

            return new MyHeader(view);

        } else if (viewType == ITEM) {

            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.inflator_layout, parent, false);

            return new MyItem(view);

        }

        throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");

    }

    @Override

    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

        if (holder instanceof MyHeader) {

            MyHeader myHeader = (MyHeader) holder;

            myHeader.tvHeader1.setText("Hi! Lokesh");

        } else if (holder instanceof MyItem) {

            MyItem myItem = (MyItem) holder;

            final Integer integer = getItem(position);

            myItem.tvVersionName.setText("Version " + integer);

            ((MyItem) holder).btEdit.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View view) {

                    mSelectedObject = integer;

                    mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);

                }

            });

            mDelete.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View view) {

                    versionsList.remove(mSelectedObject);

                    notifyDataSetChanged();

                    mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);

                }

            });

        }

    }

    @Override

    public int getItemCount() {

        return versionsList.size() + 1;

    }

    @Override

    public int getItemViewType(int position) {

        if (isPositionHeader(position))

            return HEADER;

        else return ITEM;

    }

    public boolean isPositionHeader(int position) {

        return position == 0;

    }

    private Integer getItem(int position) {

        return versionsList.get(position - 1);

    }

    private class MyItem extends RecyclerView.ViewHolder {

        private TextView tvVersionName;

        private Button btEdit;

        public MyItem(View itemView) {

            super(itemView);

            tvVersionName = (TextView) itemView.findViewById(R.id.inflator_name);

            btEdit = (Button) itemView.findViewById(R.id.inflator_edit);

        }

    }

    private class MyHeader extends RecyclerView.ViewHolder {

        private TextView tvHeader1;

        public MyHeader(View itemView) {

            super(itemView);

            tvHeader1 = (TextView) itemView.findViewById(R.id.header_layout_tv1);

        }

    }

}

public class RecyclerviewActivity extends AppCompatActivity {

    private List<Integer> versionsList = new ArrayList<>();

    private RecyclerView mRecyclerView;

    private DividerItemDecoration mDividerItemDecoration;

    private NestedScrollView mNestedScrollView;

    private BottomSheetBehavior mBottomSheetBehavior;

    private Button mDelete;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_recyclerview);

        mRecyclerView = (RecyclerView) findViewById(R.id.activity_recyclerview_rl);

        mNestedScrollView = (NestedScrollView) findViewById(R.id.activity_recyclerview_nsv);

        mDelete = (Button) findViewById(R.id.activity_main_delete);

        mBottomSheetBehavior = BottomSheetBehavior.from(mNestedScrollView);

        fillRawDataToList();

        MyRecyclerViewAdapter myRecyclerViewAdapter = new MyRecyclerViewAdapter(versionsList,mDelete

        ,mBottomSheetBehavior);

        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);

        mRecyclerView.setLayoutManager(mLayoutManager);

        mRecyclerView.setItemAnimator(new DefaultItemAnimator());

        mRecyclerView.setAdapter(myRecyclerViewAdapter);

        mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {

            @Override

            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

                super.onScrollStateChanged(recyclerView, newState);

                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);

            }

            @Override

            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

                super.onScrolled(recyclerView, dx, dy);

            }

        });

    }

    private void fillRawDataToList() {

        for (int i = 0; i <50 ; i++) {

            versionsList.add(i);

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    android:id="@+id/activity_recyclerview"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@color/cardview_light_background"

    tools:context="sciens.com.viewdeletionactivity.recyclerview_header.RecyclerviewActivity">

    <android.support.v7.widget.RecyclerView

        android:id="@+id/activity_recyclerview_rl"

        android:layout_width="match_parent"

        android:layout_height="match_parent"/>

    <android.support.v4.widget.NestedScrollView

        android:id="@+id/activity_recyclerview_nsv"

        android:layout_width="match_parent"

        android:layout_height="100dp"

        app:behavior_hideable="true"

        app:behavior_peekHeight="1dp"

        app:layout_behavior="@string/bottom_sheet_behavior">

        <Button

            android:id="@+id/activity_main_delete"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:text="Delete"/>

    </android.support.v4.widget.NestedScrollView>

</android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical" android:layout_width="match_parent"

    android:layout_height="wrap_content">

    <TextView

        android:id="@+id/header_layout_tv1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="header"

        android:textSize="22sp"

        android:gravity="center_horizontal"

        android:padding="10dp"

        android:background="@color/colorAccent"/>

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="hello"

        android:id="@+id/header_layout_hello_tv"

        android:textSize="22sp"

        android:gravity="center_horizontal"

        android:padding="10dp"

        android:background="@color/colorPrimary"/>

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="header"

        android:textSize="22sp"

        android:gravity="center_horizontal"

        android:padding="10dp"

        android:background="@color/colorAccent"/>

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="hello"

        android:textSize="22sp"

        android:gravity="center_horizontal"

        android:padding="10dp"

        android:background="@color/colorPrimaryDark"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.CardView android:layout_width="match_parent"

    android:layout_height="wrap_content"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:card_view="http://schemas.android.com/tools"

    app:cardElevation="4dp"

    card_view:cardCornerRadius="4dp"

    android:layout_marginBottom="5dp"

    android:layout_marginLeft="5dp"

    android:layout_marginRight="5dp"

    xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        android:weightSum="2">

        <TextView

            android:id="@+id/inflator_name"

            android:layout_width="0dp"

            android:layout_weight="1"

            android:layout_margin="5dp"

            android:textSize="25dp"

            android:textColor="@color/colorPrimary"

            android:layout_height="wrap_content"

            android:text="name"/>

        <Button

            android:layout_gravity="center_horizontal"

            android:id="@+id/inflator_edit"

            android:layout_width="0dp"

            android:textColor="@color/colorAccent"

            android:layout_weight="1"

            android:layout_height="wrap_content"

            android:text="Options"/>

    </LinearLayout>

</android.support.v7.widget.CardView>