Cara Membuat Toast Android Studio

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20sp"
        android:layout_centerHorizontal="true"
        android:text="@string/contoh_toast"
        android:textSize="25sp"
        android:textStyle="bold"/>

    <Button
        android:id="@+id/btnToast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_marginTop="20sp"
        android:layout_centerHorizontal="true"
        android:text="@string/tombol_toast"/>
</RelativeLayout>

package com.example.toast;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnToast = (Button)findViewById(R.id.btnToast);
        btnToast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(),"Ini Tampilan Toast", Toast.LENGTH_SHORT).show();
            }
        });
    }
}