Android Button OnClickListener

MainActivity.java

package blog.topherpedersen.uselesscameraapp;

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 myButton = findViewById(R.id.my_button);
        myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "Button Clicked!", Toast.LENGTH_LONG).show();
            }
        });
    }
}