<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/cardView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" android:elevation="4dp" app:cardCornerRadius="8dp" app:cardBackgroundColor="@android:color/white"> </androidx.cardview.widget.CardView> import androidx.cardview.widget.CardView; public class MainActivity extends AppCompatActivity { private CardView cardView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cardView = findViewById(R.id.cardView); cardView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); } }