动画时 MotionLayout 未调整大小

Question

我有这样的看法：

<androidx.constraintlayout.motion.widget.MotionLayout
                    android:id="@+id/expandableModes"
                    android:layout_width="200dp"
                    android:layout_height="200dp"
                    android:paddingBottom="5dp"
                    app:layoutDescription="@xml/journey_motion"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toStartOf="@id/guidelineLeft"
                    app:layout_constraintTop_toBottomOf="@id/travelModeText">
    ....
    </androidx.constraintlayout.motion.widget.MotionLayout>

而这个动作布局：

<?xml version="1.0" encoding="utf-8"?>
<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <Transition
        app:constraintSetEnd="@id/endExpand"
        app:constraintSetStart="@id/startExpand"
        app:duration="1000" />
    <ConstraintSet android:id="@+id/startExpand">
        <Constraint
            android:id="@id/expandableModes"
            android:layout_width="200dp"
            android:layout_height="200dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@id/guidelineLeft"
            app:layout_constraintTop_toBottomOf="@id/travelModeText" />
    </ConstraintSet>
    <ConstraintSet android:id="@+id/endExpand">
        <Constraint
            android:id="@id/expandableModes"
            android:layout_width="10dp"
            android:layout_height="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@id/guidelineLeft"
            app:layout_constraintTop_toBottomOf="@id/travelModeText" />
    </ConstraintSet>
</MotionScene>

我按代码执行：

binding.expandableModes.transitionToEnd {
                        print("")
                    }

我的动画播放了，但我的视图没有调整大小，我错过了什么？

Answer 1

您正在尝试为运动布局本身设置动画。您只能按照此处所述为直接子级设置动画：https://developer.android.com/training/constraint-layout/motionlayout

您需要创建视图的子视图并为其设置动画。

动画时 MotionLayout 未调整大小

MotionLayout not resized when animating

android

android-layout

android-motionlayout