Android : How to programmatically set layout_constraintRight_toRightOf "parent"

Question

I have a view in ConstrainLayout as follows.

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxWidth="260dp"
        android:textColor="#FFF"
        android:textSize="16sp"
        app:layout_constraintLeft_toLeftOf="@+id/parent"
        app:layout_constraintTop_toBottomOf="@id/message_date"
        android:id="@+id/text_main"
        />

I would like to change the view to either app:layout_constraintLeft_toLeftOf="@+id/parent" or layout_constraintLeft_toRightOf="@+id/parent" programmatically in recycleViewHolder based on some conditions.

Possible duplicate of [Add view to constraintLayout with constraints similar to another child](http://stackoverflow.com/questions/39831710/add-view-to-constraintlayout-with-constraints-similar-to-another-child) — W4R10CK, Jan 16 '17 at 06:36
@W4R10CK I don't want to add a view, I just want to change alignment. Can you post the relevant part of that answer? — Relm, Jan 16 '17 at 07:08

score 97 · Answer 1 · edited Jun 05 '17 at 06:30

Here is an example of setting a button to the bottom of parent view using java code:

ConstraintLayout constraintLayout;
ConstraintSet constraintSet;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    constraintLayout = (ConstraintLayout) findViewById(R.id.activity_main_constraint_layout);

    Button button = new Button(this);
    button.setText("Hello");
    constraintLayout.addView(button);

    constraintSet = new ConstraintSet();
    constraintSet.clone(constraintLayout);

    constraintSet.connect(button.getId(), ConstraintSet.LEFT, constraintLayout.getId(), ConstraintSet.RIGHT, 0);
    constraintSet.constrainDefaultHeight(button.getId(), 200);
    constraintSet.applyTo(constraintLayout);

}

to achieve something like this,

app:layout_constraintLeft_toLeftOf="@+id/parent"

your java code should look like this

set.connect(YOURVIEW.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);

and to achieve something like this,

layout_constraintLeft_toRightOf="@+id/parent"

your java code should look like this,

set.connect(YOURVIEW.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);

Here, I'm assuming android:id="@+id/parent" is the id of your parent ConstraintLayout .

`set.applyTo(layout);` doesn't this apply these constraints to the parent instead of the `TextView`? Should it be ? `set.applyTo(button);` or something similar? — Relm, Jan 16 '17 at 09:37
No the set knows to whom you want to apply the changes now it's time to tell the parent layout, hey please apply this changes. so this should be like set.applyTo(parent). — Darshan Soni, Jan 17 '17 at 12:53
Your code is wrong, first you have to add button in constraint layout then constraintSet.clone(constraintLayout); will be done. Otherwise nothing is done to button — Khyati Vara, Jun 05 '17 at 04:53

score 17 · Answer 2 · answered Apr 25 '20 at 10:15

17

constraintSet = new ConstraintSet(); and so on

Did not work for me anyhow.

Solved by

  LayoutParams layoutParams = (LayoutParams) viewToChange.getLayoutParams();
    layoutParams.leftToLeft = anotherViewId;
    layoutParams.rightToRight =anotherViewId;
    layoutParams.topToTop = anotherViewId;
    layoutParams.bottomToBottom = anotherViewId;
    layoutParams.startToStart =anotherViewId;
    layoutParams.endToEnd = anotherViewId;
    viewToChange.setLayoutParams(layoutParams);

answered Apr 25 '20 at 10:15

Holiday Fun

385
3
7

Does anyone know why in some cases constraint set just doesn't work? It works fine for me when using LayoutParams – tamj0rd2 Dec 13 '20 at 13:01
This method work for me - I want to change LinearLayout params and its parent is constrainLayout. Thanks – Adarsh Vijayan P Jul 27 '21 at 09:51

score 5 · Answer 3 · answered Nov 27 '18 at 13:37

5

Use id

class MyLayout(context: Context) : ConstraintLayout(context) {

    fun show() {
        val view = ImageView(context)
        addView(view)
        val params = view.layoutParams as ConstraintLayout.LayoutParams
        params.height = 100 
        params.width = 50
        params.rightToRight = id
        view.requestLayout()
    }
}

answered Nov 27 '18 at 13:37

onmyway133

45,645
31
257
263

it returns null from view.layoutParams – gmartinsnull Feb 21 '19 at 23:30

score 3 · Answer 4 · answered Dec 08 '20 at 15:12

I had same situation when I needed to move buttons down once a new EditText appears, In XML file they had constraints like this:

app:layout_constraintTop_toBottomOf="@+id/first_layout"

and what I needed to do is changing to sth like programmatically:

app:layout_constraintTop_toBottomOf="@+id/second_layout"

Using ConstraintLayout.LayoutParams the task is pretty straightforward e.g.

Kotlin:

val currentLayout = btn.layoutParams as ConstraintLayout.LayoutParams // btn is a View here
currentLayout.topToBottom = R.id.second_layout // resource ID of new parent field
btn.layoutParams = currentLayout

and that's it!

score 2 · Answer 5 · answered Jan 25 '23 at 09:28

2

Haven't seen better solution than this:

textMain.updateLayoutParams<ConstraintLayout.LayoutParams> {
    startToEnd = anyOtherView.id
    topToTop = anyOtherView.id
    endToStart = anyOtherView.id
    bottomToBottom = anyOtherView.id
  }

answered Jan 25 '23 at 09:28

Andrey Kijonok

291
2
17

Android : How to programmatically set layout_constraintRight_toRightOf "parent"

5 Answers5

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