pass arguments to fragments inside Bottom Navigation using navArgs-CodePudding

From Android Studio, I selected Bottom Navigation Activity project. I can compile and successfully run the generated app without any problem. However, I wanted the fragments under the BottomNavigationView to receive arguments, so I added 2 arguments, email and jwt to the starting destination fragment. So here's how my mobile_navigation.xml looks like now:

<navigation 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:id="@ id/mobile_navigation"
    app:startDestination="@ id/navigation_home">

    <fragment
        android:id="@ id/navigation_home"
        android:name="com.example.testbottomnavigation.ui.home.HomeFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home">
        <argument
            android:name="email"
            app:argType="string" />
        <argument
            android:name="jwt"
            app:argType="string" />
    </fragment>

After that I added these codes to my HomeFragment

private val myArgs by navArgs<HomeFragmentArgs>()
override fun onCreateView(){
    val email = myArgs.email
    val jwt = myArgs.jwt
}

and tried to run the app. The app will the crash with the error

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testbottomnavigation/com.example.testbottomnavigation.MainActivity}: android.view.InflateException: Binary XML file line #33 in com.example.testbottomnavigation:layout/activity_main: Binary XML file line #33 in com.example.testbottomnavigation:layout/activity_main: Error inflating class fragment
...
at com.example.testbottomnavigation.MainActivity.onCreate(MainActivity.kt:19)
...
Caused by: java.lang.IllegalArgumentException: Required argument "email" is missing and does not have an android:defaultValue

Basically the app will crash at the line binding = ActivityMainBinding.inflate(layoutInflater) under my MainActivity below

Here's my MainActivity class MainActivity : AppCompatActivity() {

private lateinit var binding: ActivityMainBinding

override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)

     binding = ActivityMainBinding.inflate(layoutInflater)
     setContentView(binding.root)

     val navView: BottomNavigationView = binding.navView    
     val navController = findNavController(R.id.nav_host_fragment_activity_main)
     val appBarConfiguration = AppBarConfiguration(setOf(
            R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications))
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)
    }
}

So looking at the code above, where and how should I set the arguments that I needed to pass to HomeFragment?

CodePudding user response：

I think you just need to add a default value:

 <argument
    android:name="email"
    app:argType="string"
    android:defaultValue="[email protected]"/>

CodePudding user response：

You didnt tranfer any values,so you should use defultvalue on argument of navigation And You can see below link for transfer data and navigate enter link description here