How to pass arguments to a fragment using bottom navigation view and Android Navigation component

In this android programming source code example, we are going to pass arguments to a fragment using bottom navigation view and Android Navigation component.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to pass arguments to a fragment using bottom navigation view and Android Navigation component.

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=".BluetoothAndNavigation.BluetoothAndNavigationActivity18">

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/bottomNav"
        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_graph8"/>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNav"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:menu="@menu/bottom_menu"
        app:elevation="2dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

res/navigation/nav_graph8.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_graph8"
    app:startDestination="@id/homeFragment">

    <fragment
        android:id="@+id/homeFragment"
        android:name="com.bluapp.androidview2.BluetoothAndNavigation.NavFragment18"
        android:label="fragment_nav_fragment18"
        tools:layout="@layout/fragment_nav_fragment18">
        <argument
            android:name="tabName"
            android:defaultValue="Home Fragment"/>
    </fragment>

    <fragment
        android:id="@+id/directionFragment"
        android:name="com.bluapp.androidview2.BluetoothAndNavigation.NavFragment18"
        android:label="fragment_nav_fragment18"
        tools:layout="@layout/fragment_nav_fragment18">
        <argument
            android:name="tabName"
            android:defaultValue="Direction Fragment"/>
    </fragment>

    <fragment
        android:id="@+id/commentFragment"
        android:name="com.bluapp.androidview2.BluetoothAndNavigation.NavFragment18"
        android:label="fragment_nav_fragment18"
        tools:layout="@layout/fragment_nav_fragment18">
        <argument
            android:name="tabName"
            android:defaultValue="Comment Fragment"/>
    </fragment>
</navigation>

res/menu/bottom_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/homeFragment"
        android:title="Home"
        android:icon="@drawable/tab_home"/>

    <item
        android:id="@+id/directionFragment"
        android:title="Direction"
        android:icon="@drawable/tab_direction"/>

    <item
        android:id="@+id/commentFragment"
        android:title="Comment"
        android:icon="@drawable/tab_comment"/>

</menu>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.NavigationUI;
import android.os.Bundle;

import com.google.android.material.bottomnavigation.BottomNavigationView;

public class BluetoothAndNavigationActivity18 extends AppCompatActivity {
    private BottomNavigationView bottomNavigationView;
    private NavController navController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bluetooth_and_navigation18);
        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNav);
        navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupWithNavController(bottomNavigationView, navController);
    }
}

fragment_nav_fragment18.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=".BluetoothAndNavigation.NavFragment18">

    <TextView
        android:id="@+id/tabName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:text="Tab Name"/>

</androidx.constraintlayout.widget.ConstraintLayout>

NavFragment18.java

import androidx.fragment.app.Fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class NavFragment18 extends Fragment {
    private TextView tabName;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_nav_fragment18, container, false);
        tabName = (TextView) rootView.findViewById(R.id.tabName);
        String argtabname = getArguments().getString("tabName");
        tabName.setText(argtabname);
        return rootView;
    }
}

app/build.gradle

implementation 'androidx.navigation:navigation-fragment:2.1.0-alpha06'
implementation 'androidx.navigation:navigation-ui:2.1.0-alpha06'

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