Android :如何以编程方式设置浮动操作按钮的重力？

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="end|bottom"
    android:src="@drawable/ic_add"
    android:contentDescription="@string/add_button_description" />

FloatingActionButton fab = findViewById(R.id.fab);
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
layoutParams.gravity = Gravity.END | Gravity.BOTTOM;
fab.setLayoutParams(layoutParams);