FragmentContainerView added.

app/build.gradle

@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-kapt'
-apply plugin: 'androidx.navigation.safeargs.kotlin'
-apply plugin: 'kotlin-parcelize'
+apply plugin: "kotlin-kapt"
+apply plugin: "androidx.navigation.safeargs.kotlin"
+apply plugin: "kotlin-parcelize"
 
 android {
     compileSdkVersion 30
@@ -42,9 +42,8 @@ android {
 
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.5.0"
-    implementation 'androidx.core:core-ktx:1.3.2'
-    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.core:core-ktx:1.5.0'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     testImplementation 'junit:junit:4.13.2'
@@ -67,7 +66,7 @@ dependencies {
     implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1"
 
     // Kotlin components
-    api "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.3"
-    api "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.3"
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.0-native-mt"
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0-native-mt"
 
 }

app/src/main/java/com/example/todoapp/MainActivity.kt

@@ -2,20 +2,28 @@ package com.example.todoapp
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.navigation.NavController
 import androidx.navigation.findNavController
+import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.ui.setupActionBarWithNavController
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var navController: NavController
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        setupActionBarWithNavController(findNavController(R.id.navHostFragment))
+        val navHostFragment = supportFragmentManager
+            .findFragmentById(R.id.navHostFragment) as NavHostFragment
+        navController = navHostFragment.navController
+
+        setupActionBarWithNavController(navController)
 
     }
 
     override fun onSupportNavigateUp(): Boolean {
-        val navController = findNavController(R.id.navHostFragment)
         return navController.navigateUp() || super.onSupportNavigateUp()
     }
 }

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

@@ -6,7 +6,7 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <fragment
+    <androidx.fragment.app.FragmentContainerView
         android:id="@+id/navHostFragment"
         android:name="androidx.navigation.fragment.NavHostFragment"
         android:layout_width="0dp"

build.gradle

@@ -8,7 +8,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.2.1'
 
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.10"
         classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.5"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files