Code refactoring, move and cleanup

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

@@ -1,44 +1,38 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Look4Sat. Amateur radio and weather satellite tracker and passes predictor for Android.
-  ~ Copyright (C) 2019, 2020 Arty Bishop (bishop.arty@gmail.com)
-  ~
-  ~ This program is free software; you can redistribute it and/or modify
-  ~ it under the terms of the GNU General Public License as published by
-  ~ the Free Software Foundation; either version 2 of the License, or
-  ~ (at your option) any later version.
-  ~
-  ~ This program is distributed in the hope that it will be useful,
-  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
-  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  ~ GNU General Public License for more details.
-  ~
-  ~ You should have received a copy of the GNU General Public License along
-  ~ with this program; if not, write to the Free Software Foundation, Inc.,
-  ~ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-  -->
-
-<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<?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/drawer_layout"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
-    tools:openDrawer="start">
+    android:layout_height="match_parent">
 
-    <include
-        android:id="@+id/include_app_bar"
-        layout="@layout/app_bar_main"
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@+id/nav_bottom"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/nav_frag"
+            android:name="androidx.navigation.fragment.NavHostFragment"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:defaultNavHost="true"
+            app:navGraph="@navigation/nav_graph" />
+
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
+
+    <com.google.android.material.bottomnavigation.BottomNavigationView
+        android:id="@+id/nav_bottom"
         android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="48dp"
+        app:itemIconSize="24dp"
+        app:itemIconTint="@color/nav_item_selector"
+        app:itemTextColor="@color/nav_item_selector"
+        app:labelVisibilityMode="selected"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:menu="@menu/nav_menu" />
 
-    <com.google.android.material.navigation.NavigationView
-        android:id="@+id/nav_view"
-        android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:layout_gravity="start"
-        android:fitsSystemWindows="true"
-        app:headerLayout="@layout/drawer_header"
-        app:menu="@menu/drawer_menu" />
-
-</androidx.drawerlayout.widget.DrawerLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>