请问星星飞翔的动画怎么实现?难点一个是弧形轨迹,另一个是得到"school"这个checkbox的位置和大小

我用ConstraintLayout布局的,怎么都得不到"school"的位置和大小

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@mipmap/background"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/iv_star"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/star"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.14"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

 
    <androidx.appcompat.widget.AppCompatCheckBox
        android:id="@+id/cb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="200dp"
        android:background="@drawable/bg_cb"
        android:button="@null"
        android:gravity="center"
        android:text="bag"
        android:textSize="30dp"
        app:layout_constraintBottom_toTopOf="@id/cb3"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/cb2"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.appcompat.widget.AppCompatCheckBox
        android:id="@+id/cb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/bg_cb"
        android:button="@null"
        android:gravity="center"
        android:text="school"
        android:textSize="30dp"
        app:layout_constraintBottom_toTopOf="@id/cb4"
        app:layout_constraintLeft_toRightOf="@id/cb1"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

   ......
</androidx.constraintlayout.widget.ConstraintLayout>