动态设置 FAB 锚点位置

Question

我需要能够从代码中更改FAB的app:layout_anchorGravity="center"，从center更改为bottom|start。 我找到了这个例子：

CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setAnchorId(xxxx);
fab.setLayoutParams(p);

但它是用于设置锚点而不是锚点重心。

- Matrucci

Answer 1

CoordinatorLayout.LayoutParams类有一个anchorGravity字段。例如：

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
lp.anchorGravity = Gravity.BOTTOM | GravityCompat.START;
fab.setLayoutParams(lp);

- Mike M.

Answer 2

Kotlin 中的相同事物

        (rightUglyBox.layoutParams as CoordinatorLayout.LayoutParams)
                       .anchorGravity 
                                     = Gravity.CENTER_VERTICAL or Gravity.LEFT;

*适用于所有布局，而不仅仅是FAB

- Hitesh Sahu