Fragments in Android Studio - Android Studio tutorials for beginners

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import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.Switch;

public class MainActivity extends AppCompatActivity {

    FragmentTransaction fragmentTransaction;

    @Override
    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Switch sw = findViewById(R.id.switch1);

        sw.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if(b){
                    fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    FirstFragment firstFragment = new FirstFragment();
                    fragmentTransaction.replace(R.id.fragment_container, firstFragment);
                    fragmentTransaction.commit();
                }
                else{
                    fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    SecondFragment secondFragment = new SecondFragment();
                    fragmentTransaction.replace(R.id.fragment_container,secondFragment);
                    fragmentTransaction.commit();
                }

            }
        });

    }
}

<?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"
    android:background="#6200EA"
    tools:context=".MainActivity">

    <Switch
        android:id="@+id/switch1"
        android:layout_width="186dp"
        android:layout_height="36dp"
        android:layout_marginTop="26dp"
        android:layout_marginBottom="32dp"
        android:text="Switch"
        android:textColor="#FFFFFF"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/fragment_container"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <fragment
        android:id="@+id/fragment_container"
        android:name="com.taimoorsikander.fragments.FirstFragment"
        android:layout_width="409dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/switch1" />
</androidx.constraintlayout.widget.ConstraintLayout>

import android.os.Bundle;

import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FirstFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_first,container,false);

        //Your Code here

        return view;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#3949AB"
    tools:context=".FirstFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="1"
        android:textColor="#fff"
        android:textSize="200sp" />

</FrameLayout>

import android.os.Bundle;

import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SecondFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_second, container, false);

        //Your Code here

        return view;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="bottom"
    android:background="#1A237E"
    tools:context=".SecondFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="2"
        android:textColor="#FFFFFF"
        android:textSize="200sp" />

    <fragment
        android:id="@+id/fragment"
        android:name="com.taimoorsikander.fragments.FragmentInsideFragment"
        android:layout_width="match_parent"
        android:layout_height="336dp"
        android:layout_gravity="bottom"
        android:layout_margin="20dp"/>

</FrameLayout>

import android.os.Bundle;

import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentInsideFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_inside, container, false);

        //Your Code here

        return view;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#1976D2"
    tools:context=".FragmentInsideFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="264dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="Fragment Inside Fragment"
        android:textColor="#FFFFFF"
        android:textSize="30sp" />

</FrameLayout>