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RootActivity.kt
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RootActivity.kt
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package com.aaglobal.jnc_playground
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.LiveData
import androidx.lifecycle.Observer
import androidx.navigation.NavController
import androidx.navigation.ui.setupActionBarWithNavController
import com.aaglobal.jnc_playground.extensions.setupWithNavController
import com.google.android.material.bottomnavigation.BottomNavigationView
class RootActivity : AppCompatActivity() {
private var currentNavController: LiveData<NavController>? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_root)
if (savedInstanceState == null) {
setupBottomNavigationBar()
} // Else, need to wait for onRestoreInstanceState
}
override fun onRestoreInstanceState(savedInstanceState: Bundle) {
super.onRestoreInstanceState(savedInstanceState)
// Now that BottomNavigationBar has restored its instance state
// and its selectedItemId, we can proceed with setting up the
// BottomNavigationBar with Navigation
setupBottomNavigationBar()
}
/**
* Called on first creation and when restoring state.
*/
private fun setupBottomNavigationBar() {
val bottomNavigationView = findViewById<BottomNavigationView>(R.id.bottom_nav)
val navGraphIds = listOf(R.navigation.home_nav_graph, R.navigation.dashboard_nav_graph, R.navigation.notifications_nav_graph)
// Setup the bottom navigation view with a list of navigation graphs
val controller = bottomNavigationView.setupWithNavController(
navGraphIds = navGraphIds,
fragmentManager = supportFragmentManager,
containerId = R.id.nav_host_container,
intent = intent
)
// Whenever the selected controller changes, setup the action bar.
controller.observe(this, Observer { navController ->
setupActionBarWithNavController(navController)
})
currentNavController = controller
}
override fun onSupportNavigateUp(): Boolean {
return currentNavController?.value?.navigateUp() ?: false
}
}