Android Studio - Tutorial Fullscreen Activity

4FA_activity_fullscreen.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:background="#0099cc"
             tools:context=".FullscreenActivity">

    <!-- La vista principale a schermo intero. Questo può essere sostituito con qualunque vista
         è necessario per presentare i tuoi contenuti, ad es. VideoView, SurfaceView,
         TextureView, ecc. -->
  
  <!--Aggiunta di un TextView (casella di testo)-->
    <TextView 
              android:id="@+id/fullscreen_content"        
              android:layout_width="match_parent"         
              android:layout_height="match_parent"        
              android:keepScreenOn="true"
              android:textColor="#33b5e5"                 
              android:textStyle="bold"                    
              android:textSize="50sp"                     
              android:gravity="center"                    
              android:text="@string/dummy_content"/>      

    <!-- Questo FrameLayout inserisce i layout figli in base alle finestre di sistema che utilizzano
         Android: fitsSystemWindows. -->
    <FrameLayout 
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
                 android:fitsSystemWindows="true">

        <LinearLayout 
                      android:id="@+id/fullscreen_content_controls"
                      style="?metaButtonBarStyle"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_gravity="bottom|center_horizontal"
                      android:background="@color/black_overlay"
                      android:orientation="horizontal"
                      tools:ignore="UselessParent">
            
          <!--Aggiunta di un Button (pulsante) -->
            <Button 
                    android:id="@+id/dummy_button"        
                    style="?metaButtonBarButtonStyle"     
                    android:layout_width="0dp"            
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="@string/dummy_button"/> 

        </LinearLayout>
    </FrameLayout>

</FrameLayout>