How to pass data from the navigationdrawer to Activity using safe-args? - navigation-drawer

Question

Let's say we have a project like this one:
class MainActivity : AppCompatActivity() {
private lateinit var drawerLayout: DrawerLayout
private lateinit var appBarConfiguration : AppBarConfiguration
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
drawerLayout = binding.drawerLayout
val navController = this.findNavController(R.id.myNavHostFragment)
NavigationUI.setupActionBarWithNavController(this, navController, drawerLayout)
appBarConfiguration = AppBarConfiguration(navController.graph, drawerLayout)
// prevent nav gesture if not on start destination
navController.addOnDestinationChangedListener { nc: NavController, nd: NavDestination, bundle: Bundle? ->
if (nd.id == nc.graph.startDestination) {
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
} else {
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
}
}
NavigationUI.setupWithNavController(binding.navView, navController)
}
Link to a simple project: https://github.com/udacity/andfun-kotlin-android-trivia/blob/Step.11-Solution-Adding-Animation/app/src/main/java/com/example/android/navigation/MainActivity.kt
My file for navGraph contains fragments and also one Activity where I want to go if user select its title from the navigation drawer. I want to send some data to this Activity. How can I do it using safe-args?
I'm using:
apply plugin: "androidx.navigation.safeargs"
and
implementation 'androidx.navigation:navigation-fragment:2.0.0'
implementation 'androidx.navigation:navigation-ui:2.0.0'

Answer 1

Firstly, you'll have to go to the navigation graph and specify an argument for the activity destination. This can be done via the design UI or in XML like this;
<navigation>
<activity android:id="#+id/someActivity">
<argument
android:name="isEditMode"
app:argType="boolean"
android:defaultValue="false" />
</activity>
</navigation>
This snippet assumes you are passing a boolean to the activity.
At this point, you can build the project so that all required files are generated.
Then in the onClick of whatever Navigation menu item responsible for starting the activity, you pass in the data;
override boolean onNavigationItemSelected(menuItem: menuItem) {
val id = menuItem.itemId
when (id) {
R.id.openActivity -> {
val bundle = bundleOf("isEditMode" to false)
findNavController().navigate(R.id.someActivity, bundle)
}
}
return true
}
Then in your activity, get the pass data safely as;
val safeArguments: MyActivityArgs by navArgs()
val isEditMode = safeArgs.isEditMode)

Answer 2

Inside your onCreate method in MainActivity use this:
val navController = this.findNavController(R.id.myNavHostFragment)
navController.addOnDestinationChangedListener { controller, destination, arguments ->
when(destination.id) {
R.id.caixaFragment -> {
var myVar = someMethodThatBringsMyVarValue()
val argument = NavArgument.Builder().setDefaultValue(mayVar).build()
destination.addArgument("idMes", argument)
}
}
}
I got it from Ayxan Haqverdili in this question