android - 包含布局的 float 操作按钮 anchor

Question

您知道是否可以使用布局中包含的 id View 作为 FAB 的 anchor 吗？例如:

<include layout="@layout/content_main" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_anchor="@id/map"
    app:layout_anchorGravity="bottom|right|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_menu_add" />

“@id/map”在包含的布局 content_main 内。

使用此代码，我目前收到以下错误:

Error:(30, 28) No resource found that matches the given name (at 'layout_anchor' with value '@id/map').

有关信息，我正在使用 include 来尝试减小我的主要布局大小。

似乎“@id/map”对于 FAB anchor 是不可见的。但我可能做错了什么。

Answer 1

我猜你缺少Tag Id android:id="@+id/map"

打开你的@layout/content_main

Floating action buttons are used for a special type of promoted action. They are distinguished by a circled icon floating above the UI and have special motion behaviors related to morphing, launching, and the transferring anchor point.

Error:(30, 28) No resource found that matches the given name (at 'layout_anchor' with value '@id/map').