In this android kotlin source code example, we are going to pass data between Android Component Navigation destinations with Safe Args in Kotlin.
You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.
Below is a step by step source code to pass data between Android Component Navigation destinations with Safe Args in Kotlin.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".Navigation.NavigationActivity13">
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph13"/>
</androidx.constraintlayout.widget.ConstraintLayout>
navigation/nav_graph13.xml
<?xml version="1.0" encoding="utf-8"?>
<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/nav_graph13"
app:startDestination="@id/navFragment13">
<fragment
android:id="@+id/navFragment13"
android:name="com.bluapp.kotlinview.Navigation.NavFragment13"
android:label="@string/app_name"
tools:layout="@layout/fragment_nav_fragment13">
<action
android:id="@+id/maintoFragment131"
app:destination="@id/navFragment131" />
</fragment>
<fragment
android:id="@+id/navFragment131"
android:name="com.bluapp.kotlinview.Navigation.NavFragment131"
android:label="@string/app_name"
tools:layout="@layout/fragment_nav_fragment131">
<argument
android:name="message"
android:defaultValue="Empty"
app:argType="string" />
</fragment>
</navigation>
MainActivity.kt
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.bluapp.kotlinview.R
class NavigationActivity13 : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_navigation13)
}
}
fragment_nav_fragment13.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/constraintlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Navigation.NavFragment13">
<androidx.appcompat.widget.AppCompatButton
android:id="@+id/senddataBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Send Data"
android:background="@color/colorAccent"
android:textColor="#ffffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
NavFragment13.kt
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.appcompat.widget.AppCompatButton
import androidx.navigation.Navigation
import com.bluapp.kotlinview.R
class NavFragment13 : Fragment() {
private var senddataBtn: AppCompatButton? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_nav_fragment13, container, false)
senddataBtn = view.findViewById(R.id.senddataBtn) as AppCompatButton
senddataBtn!!.setOnClickListener {
val action = NavFragment13Directions.maintoFragment131("Hello World")
Navigation.findNavController(view).navigate(action);
}
return view
}
}
fragment_nav_fragment131.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/constraintlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Navigation.NavFragment131">
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/receiveData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Empty"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
NavFragment131.kt
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.appcompat.widget.AppCompatTextView
import com.bluapp.kotlinview.R
class NavFragment131 : Fragment() {
private var receiveData: AppCompatTextView? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_nav_fragment131, container, false)
return inflater.inflate(R.layout.fragment_nav_fragment131, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val arg = NavFragment131Args.fromBundle(arguments!!)
receiveData = view.findViewById(R.id.receiveData) as AppCompatTextView
receiveData!!.text = arg.message
}
}
app/build.gradle
dependencies {
implementation 'androidx.navigation:navigation-fragment:2.1.0'
implementation 'androidx.navigation:navigation-ui:2.1.0'
implementation 'androidx.navigation:navigation-fragment-ktx:2.1.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.1.0'
}
apply plugin: 'androidx.navigation.safeargs.kotlin'
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