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    <Transition
        app:constraintSetStart="@+id/start"
        app:constraintSetEnd="@id/end"
        motion:duration="3000">
        <OnClick <!--🔥 클릭을 통해 애니메이션 실행-->
            motion:targetId="@+id/example_btn"
            motion:clickAction="toggle"
            />
        <KeyFrameSet>
            <KeyAttribute

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<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:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layoutDescription="@xml/MotionScene을 정의한 xml파일"
    tools:context=".MainActivity">

    <ImageView

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buildTypes {
  debug { // debug 빌드 설정
    ...
  }
  release { // release 빌드 설정
    minifyEnabled true // 미사용 코드 삭제
    shrinkResources true // 미사용 리소스 삭제
    ...
  }
}

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-keepattributes LineNumberTable,SourceFile
-renamesourcefileattribute SourceFile

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androidx.appcompat.app.ActionBarDrawerToggle$DelegateProvider -> a.a.a.b:
androidx.appcompat.app.AlertController -> androidx.appcompat.app.AlertController:
    android.content.Context mContext -> a
    int mListItemLayout -> O
    int mViewSpacingRight -> l
    android.widget.Button mButtonNeutral -> w
    int mMultiChoiceItemLayout -> M
    boolean mShowTitle -> P
    int mViewSpacingLeft -> j
    int mButtonPanelSideLayout -> K

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#...

-keep class {패키지명}.data.model.** { *; } # 이 부분!
-keepclassmembers class {패키지명}.data.model.** { *; } # 이 부분!

#...

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override suspend fun getRegionList(): ArrayList<Region> {
    // ...

    val result = regionRef.get().await()
    val documents = result.documents

    for (document in documents) { // document에는 정상적으로 데이터가 담겨있는 것을 확인함.
        val region = document.toObject<Region>() // 🔥 toObject()가 정상작동하지 않아서 region에 빈 데이터가 들어감.

        if (region != null) regionInfo.add(region)

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buildTypes {
  debug {
  ...
  }
  release {
    ...
    debuggable true
  }
}

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mViewpager.registerOnPageChangeCallback(object: OnPageChangeCallback() {
    override fun onPageSelected(position: Int) {
        // height를 wrap_content가 되도록 설정
        val view = (getChildAt(0) as RecyclerView).layoutManager?.findViewByPosition(position) // 표시된 아이템의 뷰 객체
        view?.post { // UI 스레드에서 해당 뷰 height를 다시 설정해서 그려줌
            val wMeasureSpec =
                View.MeasureSpec.makeMeasureSpec(view.width, View.MeasureSpec.EXACTLY)
            val hMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
            view.measure(wMeasureSpec, hMeasureSpec)
            

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    /**
     * A lot of places in code rely on an assumption that the page fills the whole ViewPager2.
     *
     * TODO(b/70666617) Allow page width different than width/height 100%/100%
     */
    private RecyclerView.OnChildAttachStateChangeListener enforceChildFillListener() {
        return new RecyclerView.OnChildAttachStateChangeListener() {
            @Override
            public void onChildViewAttachedToWindow(@NonNull View view) {
                RecyclerView.LayoutParams layoutParams =