1. 코드

(1) DocumentWebViewFragment2.java

WebView webView = (WebView) rootView.findViewById(R.id.webView2);
final ConstraintLayout topBar = (ConstraintLayout) rootView.findViewById(R.id.topBar);
final ConstraintLayout BottomBar = (ConstraintLayout) rootView.findViewById(R.id.BottomBar);


            webView.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    switch (event.getAction())
                    {
                        case MotionEvent.ACTION_DOWN:
                            return false;

                        case MotionEvent.ACTION_MOVE:{
                            return false;
                        }
                        case MotionEvent.ACTION_UP:
                            if(animState == false){
                                Animation animation = AnimationUtils.loadAnimation(getActivity(),R.anim.anim_document_web_view_top_bar_up);
                                Animation animation2 = AnimationUtils.loadAnimation(getActivity(),R.anim.anim_document_web_view_bottom_bar_down);
                                topBar.startAnimation(animation);
                                BottomBar.startAnimation(animation2);
                                animState = true;
                            } else{
                                Animation animation = AnimationUtils.loadAnimation(getActivity(),R.anim.anim_document_web_view_top_bar_down);
                                Animation animation2 = AnimationUtils.loadAnimation(getActivity(),R.anim.anim_document_web_view_bottom_bar_up);
                                topBar.startAnimation(animation);
                                BottomBar.startAnimation(animation2);
                                animState = false;
                            }
                            return true;
                    }
                    return false;
                }
            });

스위치 케이스에서 액션다운과 액션무브를 지우게 되면
다운과 무브가 그대로 작동되기 때문에 액션업이 작동되지 않는다.

액션 다운만 사용시 -> 액션업 return false;
액션 업만 사용시 -> 액션 다운, 액션 무브 return false;

(2) fragment_document_webview2.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:focusable="true">

        <WebView
            android:id="@+id/webView2"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <androidx.constraintlayout.widget.ConstraintLayout
            android:clickable="true"
            android:id="@+id/topBar"
            android:layout_width="match_parent"
            android:layout_height="70dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent">

            <androidx.constraintlayout.widget.ConstraintLayout
                android:background="@drawable/document_web_view_round"
                android:layout_width="match_parent"
                android:layout_height="85dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintBottom_toBottomOf="parent">

                <ImageView
                    android:layout_marginTop="2.5dp"
                    android:id="@+id/btnClose2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:src="@drawable/document_back"
                    android:padding="15dp"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent"
                    app:layout_constraintBottom_toBottomOf="parent"/>

                <TextView
                    android:layout_marginTop="2.5dp"
                    android:layout_gravity="center"
                    android:id="@+id/title2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/white"
                    android:textSize="20dp"
                    android:maxLength="30"
                    android:text="testTitle"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintBottom_toBottomOf="parent" />

            </androidx.constraintlayout.widget.ConstraintLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:clickable="true"
            android:id="@+id/BottomBar"
            android:layout_width="match_parent"
            android:layout_height="70dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent">

            <androidx.constraintlayout.widget.ConstraintLayout
                android:background="@drawable/document_web_view_round"
                android:layout_width="match_parent"
                android:layout_height="85dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent">

                <LinearLayout
                    android:layout_marginTop="5dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:paddingStart="10dp"
                    app:layout_constraintTop_toTopOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintEnd_toEndOf="parent">

                    <LinearLayout
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:orientation="horizontal"
                        android:gravity="center_horizontal">

                        <EditText
                            android:padding="15dp"
                            android:id="@+id/editNowPage2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textSize="20dp"
                            android:singleLine="true"
                            android:inputType="number"
                            android:background="@null"
                            android:textColorHint="@color/white"
                            android:textColor="@color/white"
                            android:textStyle="bold"
                            android:hint="1"/>

                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="/"
                            android:textSize="20dp"
                            android:textStyle="bold"
                            android:textColor="@color/white"/>

                        <TextView
                            android:paddingHorizontal="15dp"
                            android:id="@+id/txtTotalPage2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:textSize="20dp"
                            android:textColor="@color/white"
                            android:textStyle="bold"
                            android:text="9999"/>

                    </LinearLayout>

                    <LinearLayout
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:orientation="horizontal"
                        android:gravity="center_horizontal">

                        <ImageView
                            android:id="@+id/btnPrevious2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:src="@drawable/document_previous"
                            android:padding="15dp" />

                        <ImageView
                            android:id="@+id/btnForward2"
                            android:layout_marginStart="50dp"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:src="@drawable/document_next"
                            android:padding="15dp" />
                    </LinearLayout>

                </LinearLayout>

            </androidx.constraintlayout.widget.ConstraintLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

(3) anim_document_web_view_bottom_bar_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">

    <translate
        android:fromYDelta="0%p"
        android:toYDelta="20%p"
        android:duration="800"
        android:repeatCount="0" />

    <!-- android:fromYDelta="0%p" : 시작 위치 -->
    <!-- android:toYDelta="30%p" : 종료 위치 -->
    <!-- android:duration="2000" : 동작 시간 -->
    <!-- android:repeatCount="-1" : 반복횟수(-1은 무한반복) -->
    <!-- android:fillAfter="true" : 애니메이션 종료 후 위치 원상복귀 여부 -->

</set>

(4) anim_document_web_view_bottom_bar_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">

    <translate
        android:fromYDelta="20%p"
        android:toYDelta="0%p"
        android:duration="800"
        android:repeatCount="0" />

    <!-- android:fromYDelta="0%p" : 시작 위치 -->
    <!-- android:toYDelta="30%p" : 종료 위치 -->
    <!-- android:duration="2000" : 동작 시간 -->
    <!-- android:repeatCount="-1" : 반복횟수(-1은 무한반복) -->
    <!-- android:fillAfter="true" : 애니메이션 종료 후 위치 원상복귀 여부(안먹으면 set안에 작성) -->

</set>

(5) anim_document_web_view_top_bar_up

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">

    <translate
        android:fromYDelta="0%p"
        android:toYDelta="-20%p"
        android:duration="800"
        android:repeatCount="0" />

    <!-- android:fromYDelta="0%p" : 시작 위치 -->
    <!-- android:toYDelta="30%p" : 종료 위치 -->
    <!-- android:duration="2000" : 동작 시간 -->
    <!-- android:repeatCount="-1" : 반복횟수(-1은 무한반복) -->
    <!-- android:fillAfter="true" : 애니메이션 종료 후 위치 원상복귀 여부 -->

</set>

(6) anim_document_web_view_top_bar_down

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">

    <translate
        android:fromYDelta="-20%p"
        android:toYDelta="0%p"
        android:duration="800"
        android:repeatCount="0" />

    <!-- android:fromYDelta="0%p" : 시작 위치 -->
    <!-- android:toYDelta="30%p" : 종료 위치 -->
    <!-- android:duration="2000" : 동작 시간 -->
    <!-- android:repeatCount="-1" : 반복횟수(-1은 무한반복) -->
    <!-- android:fillAfter="true" : 애니메이션 종료 후 위치 원상복귀 여부 -->

</set>