Simple Checkboxes

 Java

package com.example.project2;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
    CheckBox c1,c2;
    Button b1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        c1 = findViewById(R.id.m1);
        c2 = findViewById(R.id.m2);

        b1 = findViewById(R.id.button);

        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (c1.isChecked() && c2.isChecked()){
                    Toast.makeText(getApplicationContext(), "Bring me Thanos " +c1.getText().toString()+"\n"+c2.getText().toString(), Toast.LENGTH_SHORT).show();
                }
                else if(c1.isChecked()){
                    Toast.makeText(getApplicationContext(), c1.getText().toString(), Toast.LENGTH_SHORT).show();
                } else if(c2.isChecked()){
                    Toast.makeText(getApplicationContext(), c2.getText().toString(), Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

XML

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

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Movies Watched" />

    <CheckBox
        android:id="@+id/m1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Infinity War" />

    <CheckBox
        android:id="@+id/m2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Endgame" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SHOW" />

</LinearLayout>