Calculator-Hide-Files/app/src/main/res/layout/activity_view_folder.xml

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activities.ViewFolderActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:padding="8dp"
        android:id="@+id/toolBar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.appcompat.widget.AppCompatImageButton
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@drawable/ic_back"
            app:tint="@color/svgTintColor"
            android:scaleType="fitCenter"
            android:background="#00000000"
            android:padding="8dp"
            android:id="@+id/back"/>
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="@string/hidden_space"
            android:textSize="22sp"
            android:singleLine="true"
            android:padding="4dp"
            android:textStyle="bold"
            android:layout_weight="1"
            android:id="@+id/folderName"/>


        <androidx.appcompat.widget.AppCompatImageButton
            android:id="@+id/menuButton"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@drawable/ic_more"
            app:tint="?attr/colorPrimary"
            android:scaleType="fitCenter"
            android:padding="7dp"
            android:visibility="gone"
            android:background="#00000000"/>

    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolBar">

    </androidx.recyclerview.widget.RecyclerView>

    <LinearLayout
        android:id="@+id/noItems"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:src="@drawable/ic_no_items" />

        <TextView
            android:id="@+id/noItemsTxt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:gravity="center"
            android:padding="10dp"
            android:text="@string/no_items_available_add_one_by_clicking_on_the_plus_button"
            android:textSize="16sp" />

    </LinearLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/addImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/add_image"
        android:layout_marginBottom="10dp"
        android:text="@string/add_image"
        app:tint="@color/white"
        android:visibility="gone"
        android:backgroundTint="?attr/colorPrimary"
        app:layout_constraintBottom_toTopOf="@+id/addVideo"
        app:layout_constraintEnd_toEndOf="@+id/addVideo"
        app:layout_constraintStart_toStartOf="@+id/addVideo" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/addVideo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:src="@drawable/video_add"
        android:text="@string/add_image"
        android:visibility="gone"
        app:tint="@color/white"
        android:backgroundTint="?attr/colorPrimary"
        app:layout_constraintBottom_toTopOf="@+id/addAudio"
        app:layout_constraintEnd_toEndOf="@+id/addAudio"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="@+id/addAudio" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/addAudio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:src="@drawable/music_add"
        android:text="@string/add_image"
        android:visibility="gone"
        app:tint="@color/white"
        android:backgroundTint="?attr/colorPrimary"
        app:layout_constraintBottom_toTopOf="@+id/addDocument"
        app:layout_constraintEnd_toEndOf="@+id/addDocument"
        app:layout_constraintStart_toStartOf="@+id/addDocument" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/addDocument"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/document_add"
        android:text="@string/add_image"
        android:layout_marginBottom="10dp"
        app:tint="@color/white"
        android:visibility="gone"
        android:backgroundTint="?attr/colorPrimary"
        app:layout_constraintBottom_toTopOf="@+id/fabExpend"
        app:layout_constraintEnd_toEndOf="@+id/fabExpend"
        app:layout_constraintStart_toStartOf="@+id/fabExpend" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fabExpend"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="20dp"
        android:src="@drawable/ic_add"
        android:backgroundTint="?attr/colorPrimary"
        android:text="@string/add_image"
        app:tint="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>