firt init

app/src/main/java/com/sambath/sbc/app/MainActivity.kt

@@ -0,0 +1,12 @@
+package com.sambath.sbc.app
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import com.sambath.sbc.R
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main2)
+    }
+}

app/src/main/res/layout/activity_main2.xml

@@ -0,0 +1,36 @@
+<?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/coordinator"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".app.ShareActivity">
+
+    <include layout="@layout/app_bar" />
+
+    <com.google.android.material.bottomnavigation.BottomNavigationView
+        android:id="@+id/nav_view"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="0dp"
+        android:layout_marginEnd="0dp"
+        android:background="?android:attr/windowBackground"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:menu="@menu/bottom_nav_menu" />
+
+    <fragment
+        android:id="@+id/nav_host_fragment_activity_main"
+        android:name="androidx.navigation.fragment.NavHostFragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:defaultNavHost="true"
+        app:layout_constraintBottom_toTopOf="@id/nav_view"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:navGraph="@navigation/mobile_navigation" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>