Simple template to create an Android Bottom Sheet navigation

bottom_sheet.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/bottomSheet"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:elevation="16dp"
    app:behavior_hideable="true"
    app:behavior_peekHeight="0dp"
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
    
    <!--
        There are several thinks you should be aware here.
        First, Im using a FrameLayout as a parent for the fragment cause this way
        I can add this .xml file using an include in the parent. And the fragment take of the logic, if it is design or if it is
        procedures (xml and Java).
        Second, you have to include a background color, otherwise this is transparent, pointless.
        Third, coudln't find the elevation in the android material guide for bottom sheet but did found it in the elevation guid
        in the general content https://material.google.com/material-design/elevation-shadows.html#elevation-shadows-elevation-android
        Fourth, hideable is set to true, so if the user swipe it down it will be not visible, if you set it to false, then swipe
        down will lower the view but the peek height will remain visible
        Five, behavior_peekHeight is set to 0 that means the user initially can see the bottom sheet and will change state programatically
        you can add a peek heigth if needed
        And six, this is the key app:layout_behavior="android.support.design.widget.BottomSheetBehavior" what out it you have nothing
        One last thing adding an id is always usefull cause that way in the view you can get and change state programatically
    -->

    <fragment
        android:id="@+id/nameOfYourFragment"
        android:name="com.yourDomain.yourApp.views.main.bottomSheet.BottomSheetFragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:layout="@layout/fragment_bottom_sheet" />

</FrameLayout>

BottomSheetFragment.java

public class BottomSheetFragment extends Fragment {

    private BottomSheetBehavior sheetBehavior;
    
    public BottomSheetFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return  inflater.inflate(R.layout.fragment_bottom_sheet, container, false);
    }

    /*You have to acces the Acitvity view by overriding onActivityCreated otherwise view is not available and it will crash*/
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        FrameLayout bottomSheet = (FrameLayout) getActivity().findViewById(R.id.bottomSheet);
        sheetBehavior = BottomSheetBehavior.from(bottomSheet);
    }
    
    /*We are not doing nothing with this listener, this method is here to guide you*/
    private void setBottomSheet() {
      /*Just a random thought, this is one of the few method I have seen being named Callback...*/
      sheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet, int newState) {
                if (BottomSheetBehavior.STATE_COLLAPSED == newState) {
                    //TODO do something
                } else {
                    //TODO do something else
                }
            }

            @Override
            public void onSlide(@NonNull View bottomSheet, float slideOffset) {
              //TODO do something and tell me about it in the comments, 
              //cause I have never had the need for this, really! I want to know
            }
        });
    }
    
    /*This method is not used, it is here for guide you*/
    private void expandBottomSheet() {
      /*Some button could trigger this and the bottom sheet would expand*/
      sheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
      /*You can change expand for collapse to do the opposite*/
    }
}