在布局的基线上添加按钮

Question

如何将按钮放置在布局的基线上，如下图所示

Answer 1

 <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.CardView
            android:id="@+id/cardView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:cardCornerRadius="7dp"
            app:cardElevation="22dp">


        </android.support.v7.widget.CardView>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_anchor="@+id/cardView"
            app:srcCompat="@drawable/ic_facebook"
            app:layout_anchorGravity="center|bottom" />

    </android.support.design.widget.CoordinatorLayout>