Having trouble displaying a snackbar to button/btn2 need some help

activity_main.xml

mainactivity.java

package abdicasis.ali.n01457649; import androidx.appcompat.app.AppCompatActivity; import androidx.coordinatorlayout.widget.CoordinatorLayout; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { Button btn1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn1 = (Button)findViewById(R.id.btn1); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = null; Toast.makeText(MainActivity.this, "Abdicasis Ali cp24.com", Toast.LENGTH_LONG).show(); switch (view.getId()) { case R.id.btn1: intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.cp24.com")); startActivity(intent); break; } } }); } }