How to finish Activity in Android Navigation Component

In this android programming source code example, we are going to finish Activity in 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 finish Activity in 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.BluetoothAndNavigationActivity16">

    <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/finishBtn"
        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_graph6"/>

    <Button
        android:id="@+id/finishBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Finish"
        android:textColor="#ffffff"
        android:background="@color/colorAccent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

res/navigation/nav_graph6.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_graph6"
    app:startDestination="@id/navFragment16">

    <fragment
        android:id="@+id/navFragment16"        android:name="com.bluapp.androidview2.BluetoothAndNavigation.NavFragment16"
        android:label="fragment_nav_fragment16"
        tools:layout="@layout/fragment_nav_fragment16" />

</navigation>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.Navigation;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class BluetoothAndNavigationActivity16 extends AppCompatActivity {

    private Button finishBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bluetooth_and_navigation16);
        finishBtn = findViewById(R.id.finishBtn);
        finishBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

fragment_nav_fragment16.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.NavFragment16">

    <TextView
        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="Blank Fragment"/>

</androidx.constraintlayout.widget.ConstraintLayout>

NavFragment16.java

import androidx.fragment.app.Fragment;

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


public class NavFragment16 extends Fragment {

    @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_fragment16, container, false);
        return rootView;
    }
}

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