如何通过代码将Button定位在RelativeLayout中？

    android:id="@+id/relative_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

   <Button
        android:id="@+id/my_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click me" />

</RelativeLayout>

import android.os.Bundle;
import android.widget.Button;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {

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

        RelativeLayout relativeLayout = findViewById(R.id.relative_layout);
        Button myButton = findViewById(R.id.my_button);

        // 设置Button的位置
        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
        myButton.setLayoutParams(layoutParams);
    }
}