Refactor to organise the project and change visibility modifiers

app/src/main/res/layout/activity_first_time.xml

@@ -7,7 +7,7 @@
     android:layout_height="match_parent"
     android:background="@color/colorBackground"
     android:fitsSystemWindows="true"
-    tools:context=".FirstTime">
+    tools:context=".activities.FirstTime">
 
     <androidx.core.widget.NestedScrollView
         android:layout_width="match_parent"

app/src/main/res/layout/app_bar_main.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".Main">
+    tools:context=".activities.Main">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appbarlayout"

app/src/main/res/layout/content_main.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".Main"
+    tools:context=".activities.Main"
     tools:showIn="@layout/app_bar_main"
     android:id="@+id/content"
     android:background="@color/colorBackground"

app/src/main/res/layout/content_settings.xml

@@ -5,7 +5,7 @@
     android:layout_height="match_parent"
     xmlns:tools="http://schemas.android.com/tools"
     android:background="@color/colorBackground"
-    tools:context=".SettingsFragment">
+    tools:context=".fragments.SettingsFragment">
 
     <androidx.core.widget.NestedScrollView
         android:id="@+id/nsvsettings"