LinearLayout.LayoutParams navigationBarParams =
    new LinearLayout.LayoutParams(0, (int)(BAR_DEFAULT_HEIGHT_DP * density) );

    _navigationBar.setId(R.id.navigation_fragment_navigation_bar);
    _navigationBar.setPadding(0, 0, 0, 0);
    _navigationBar.setLayoutParams(navigationBarParams);
    _navigationBar.setOrientation(LinearLayout.HORIZONTAL);
    _navigationBar.setBaselineAligned(false);
    _navigationBar.setWeightSum(6f);
    _navigationBar.setElevation(20.0f);

    ConstraintLayout con = (ConstraintLayout)_rootView.findViewById(_rootConstraintLayoutId);
    con.addView(_navigationBar);

    ConstraintSet set = new ConstraintSet();
    set.clone(con);
    set.constrainWidth(_navigationBar.getId(), 0);
    set.connect(_navigationBar.getId(), ConstraintSet.TOP, con.getId(), ConstraintSet.TOP, 100 ); //work!
    set.connect(_navigationBar.getId(), ConstraintSet.LEFT, con.getId(), ConstraintSet.LEFT,100 ); //not work!!
    set.connect(_navigationBar.getId(), ConstraintSet.RIGHT, con.getId(), ConstraintSet.RIGHT, 100 ); //not work!!
    set.applyTo(con);