/**
 * Created by Administrator on 2018/6/20.
 */
/*CustomFragmentDialog 最终显示的高度 决定于内容的高度*/
public class CustomFragmentDialog extends BottomSheetDialogFragment {
    private ArrayList<String> list = new ArrayList<>();

    public CustomFragmentDialog() {
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.content_bottom_sheet_fragment_dialog,container, false);
        initViews(view);
        return view;
    }

    private void initViews(View view) {
        for (int i = 0;i < 100;i++){
            list.add("条目"+i);
        }
        RecyclerView recyclerView = view.findViewById(R.id.rv_item);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        RecyclerViewAdapter adapter = new RecyclerViewAdapter(list);
        recyclerView.setAdapter(adapter);
    }

}

/**
 * 全屏显示 最终显示的高度决定于内容的高度
 */
public class FullSheetDialogFragment extends BottomSheetDialogFragment{

    private BottomSheetBehavior mBehavior;
    private ArrayList<String> list = new ArrayList<>();

    public FullSheetDialogFragment() {
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
        View view = View.inflate(getContext(), R.layout.content_bottom_sheet_fragment_dialog, null);
        initViews(view);
        dialog.setContentView(view);
        mBehavior = BottomSheetBehavior.from((View) view.getParent());

        return dialog;
    }

    private void initViews(View view) {
        for (int i = 0;i < 100;i++){
            list.add("条目"+i);
        }
        RecyclerView recyclerView = view.findViewById(R.id.rv_item);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        RecyclerViewAdapter adapter = new RecyclerViewAdapter(list);
        recyclerView.setAdapter(adapter);
    }

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

}

 case R.id.btn_bottomsheet_dialog_fragment://fragment
//                CustomFragmentDialog fragmentDialog = new CustomFragmentDialog();
//                fragmentDialog.show(getSupportFragmentManager(),"CustomFragmentDialog");

                FullSheetDialogFragment fullSheetDialogFragment = new FullSheetDialogFragment();
                fullSheetDialogFragment.show(getSupportFragmentManager(),"FullSheetDialogFragment");
                break;

两种写法 效果没感觉有啥区别