Change Color Activity Android Java

package com.example.helloworld;

import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void changeColor(View view){
        ConstraintLayout cl = findViewById(R.id.constraintLayout);

        switch(view.getId()){
            case R.id.button1:
                cl.setBackgroundColor(Color.parseColor("#000000"));break;
            case R.id.button2:
                cl.setBackgroundColor(Color.parseColor("#ffffff")); break;
        }
    }

}