Navigation

Readme.txt

Gradle dependencies
xml file -> nav_graph 
Create two fragment for testing
add both fragment in nav_graph, assign one fragment as home. 
activity_main xml code changes -> use coordinate layout, appbar layout, toolbar, navhostfragment.
add navigation code to activityMain. 


//notes
tools:layout="@layout/dashboard" -> used to dispaly fragment layout in nav_graph 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:backgroundTint="@android:color/holo_orange_light"
        app:liftOnScroll="true"
        tools:ignore="UnusedAttribute">
            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?actionBarSize"/>
    </com.google.android.material.appbar.AppBarLayout>

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="?actionBarSize"
    app:defaultNavHost = "true"
    app:navGraph="@navigation/nav_graph"/>



</androidx.coordinatorlayout.widget.CoordinatorLayout>

ActivityMain.kt

class MainActivity : AppCompatActivity() {

    private lateinit var navHostFragment: NavHostFragment
    private lateinit var appBarConfiguration: AppBarConfiguration

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)


        initViews(binding)
    }

    private fun initViews(binding: ActivityMainBinding) {
        setSupportActionBar(binding.toolbar)
        supportActionBar!!.setDisplayShowTitleEnabled(false)
        navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment? ?: return

        with(navHostFragment.navController) {
            appBarConfiguration = AppBarConfiguration(graph)
            setupActionBarWithNavController(this, appBarConfiguration)
        }
    }

    override fun onSupportNavigateUp(): Boolean {
        navHostFragment.navController.navigateUp()
        return super.onSupportNavigateUp()
    }
}

build.gradle

def nav_version = "2.6.0"

    //navigation
    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"