Android ConstraintLayout以编程方式进行连接，但只能自上而下地工作

Question

    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);

I add LinearLayout to root ConstraintLayout. and connect constraint TOP to TOP, LEFT to LEFT, RIGHT to RIGHT with all value 100. but only top value 100 is work. not work left, right. what wrong my code?

Answer 1

임근영 Use Start and End instead on that way your view it will support different languages.

set.connect(boton.getId() , ConstraintSet.START , ConstraintSet.PARENT_ID , ConstraintSet.START , 80);

I know there is a bug reported on google for that.

Answer 2

android.support.constraint.ConstraintLayout

on that try removing it and use

"LinearLayout"

you will be able to change your orientation as you like. by writing

andriod:oreiantation="horizontal" or andriod:oreiantation="vertiacl"

its your choice