Animate LayoutParams changes in ConstraintLayout

Question

I am creating app in which there is screen with searchBar by this lib. My activity layout looks like this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<android.support.constraint.ConstraintLayout
        android:id="@+id/wrapper"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:animateLayoutChanges="true">

    <TextView
            android:id="@+id/title"
            android:textColor="@color/colorPrimary"
            android:text="@string/mainScreenTitle"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            android:paddingTop="100dp"/>

    <com.arlib.floatingsearchview.FloatingSearchView
            android:id="@+id/searchView"
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_marginTop="100dp"
            android:animateLayoutChanges="true"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/title"/>

</android.support.constraint.ConstraintLayout>

</RelativeLayout>

There i have to move FloatingSearchingView to top of screen and change height to for example 500dp - like this:

app:layout_constraintTop_toTopOf="parent"
android:layout_height="500dp"

And later i will have to move it back and change height again to default value

app:layout_constraintTop_toBottomOf="@+id/title"
android:layout_height="50dp"

The problem is, i have to animate it. I have spent a lot of time searching for solution but unfortunately i didnt find anything.

Answer 1

I had to animate the TextView height inside a ConstraintLayout.

 <androidx.constraintlayout.widget.ConstraintLayout
                ...
                android:animateLayoutChanges="true"
                >

                <TextView
                 ...

I first informed the ConstraintLayout that the layout was about to change:

constraintlayout.getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);

and then updated the textView height (or whatever other param)

textView.getLayoutParams().height = 200;
textView.requestLayout();

for something simple as that, no need to set animators or involve other libraries.