IssueTracker

ConstraintLayout version:2.0.0-alpha2

In video file you can see red view is not visible when setting MotionScene in code, but showing when we are setting layoutDescription in layout file.

MainActivity.kt

class MainActivity : AppCompatActivity() {

    val TAG = MainActivity::class.java.simpleName
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        mainMotionLayout.loadLayoutDescription(R.xml.serial_scene)
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mainMotionLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <View
        android:id="@+id/view"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="@color/colorPrimary"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/view2"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginStart="120dp"
        android:layout_marginLeft="120dp"
        android:background="@color/colorAccent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.motion.widget.MotionLayout>


serial_scene.xml

<?xml version="1.0" encoding="utf-8"?>
<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:motion="http://schemas.android.com/apk/res-auto">
    <Transition
        android:id="@+id/firstTransition"
        motion:constraintSetEnd="@id/constraintEnd"
        motion:constraintSetStart="@id/constraintStart">
        <OnSwipe
            motion:dragDirection="dragUp"
            motion:touchAnchorId="@id/view"
            motion:touchAnchorSide="bottom" />
    </Transition>

    <ConstraintSet android:id="@+id/constraintStart">
        <Constraint
            android:id="@id/view"
            android:layout_width="60dp"
            android:layout_height="60dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
    </ConstraintSet>
    <ConstraintSet android:id="@+id/constraintEnd">
        <Constraint
            android:id="@id/view"
            android:layout_width="60dp"
            android:layout_height="60dp"
            motion:layout_constraintBottom_toBottomOf="parent"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
    </ConstraintSet>

 
</MotionScene>