Android Kotlin Show Navigation Drawer Icon Instead Of Back Button In Some Fragment

I want to show navigation drawer icon instead of Back button on a certain fragment. I created the App with Navigation graph. Let's say i have 2 fragments (LoginFragment and Dashbo

Solution 1:

try this I hope that it will help you, this will hide actionBar on LoginFragment as it's the startDestination on graph and show it otherwise

class MainActivity : AppCompatActivity() {

private lateinit var appBarConfiguration: AppBarConfiguration

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val toolbar: Toolbar = findViewById(R.id.toolbar)
    setSupportActionBar(toolbar)

    val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
    val navView: NavigationView = findViewById(R.id.nav_view)
    val navController = findNavController(R.id.nav_host_fragment)



    // prevent nav gesture if not on start destination
    navController.addOnDestinationChangedListener { nc: NavController, nd: NavDestination, args: Bundle? ->
        if (nd.id == nc.graph.startDestination) {
         drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
         supportActionBar?.hide()
        } else {
         supportActionBar?.show()
         drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
        }
    }

     // here this ids are form fragment which should show navigation icon
    appBarConfiguration = AppBarConfiguration(setOf(
            R.id.nav_home,R.id.nav_gallery, R.id.nav_slideshow), drawerLayout)
    setupActionBarWithNavController(navController, appBarConfiguration)
    navView.setupWithNavController(navController)
}

override fun onCreateOptionsMenu(menu: Menu): Boolean {
    // Inflate the menu; this adds items to the action bar if it is present.
    menuInflater.inflate(R.menu.main, menu)
    return true
}

override fun onSupportNavigateUp(): Boolean {
    val navController = findNavController(R.id.nav_host_fragment)
    return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
 }
}