Java Android 浮动视图（在其他视图之上）
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Android floating view (over other views)
提问by dave paola
I've been messing around with this for a few days now, hopefully someone here can lend me a hand.
我已经被这个问题困扰了几天了，希望这里有人能帮我一把。
I have a simple two-column layout, the left side is a navigation bar with buttons, the right side is a content panel. When the user taps one of the buttons (say, the third one down), I'd like to have a floating view aligned to the right of this button but floating on top of the content pane. Here's a picture to illustrate what I mean:
我有一个简单的两列布局，左侧是带按钮的导航栏，右侧是内容面板。当用户点击其中一个按钮（比如第三个向下）时，我希望有一个浮动视图与此按钮的右侧对齐，但浮动在内容窗格的顶部。这是一张图片来说明我的意思：
Everything I've tried shoves the floating menu inside the navigation bar or inside the content panel, which is not what I want. Any ideas? Here's basically what I have so far:
我尝试过的所有操作都将浮动菜单推到导航栏内或内容面板内，这不是我想要的。有任何想法吗？到目前为止，这基本上是我所拥有的：
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_alignParentLeft="true"
android:id="@+id/navigation_bar"
>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.14"
>
<ImageButton
android:id="@+id/button1_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/icon"
android:layout_gravity="center"
/>
</FrameLayout>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.14"
>
<ImageButton
android:id="@+id/button2_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/icon"
android:layout_gravity="center"
/>
</FrameLayout>
</LinearLayout>
<FrameLayout
android:id="@+id/content"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.14"
android:layout_toRightOf="@id/navigation_bar"
>
</FrameLayout>
</RelativeLayout>
采纳答案by Cheryl Simon
A FrameLayout allows you to have a view overlapping another view. I'm not sure it makes sense to have them with only one child view, as you have in your example. Try having a FrameLayout at the highest level, with your "static" view as the first child element, and the floating menu as the second child.
FrameLayout 允许您让一个视图与另一个视图重叠。我不确定让它们只有一个子视图是否有意义，就像您在示例中所做的那样。尝试在最高级别使用 FrameLayout，将“静态”视图作为第一个子元素，将浮动菜单作为第二个子元素。
The developer documentshave a good overview the layout types, it might help you get started.
该开发者文档有一个很好的概述的布局类型，它可以帮助你上手。
回答by Shachar
RelativeLayoutis what you want.FrameLayoutmust only have one child, and is therefore, usually, only used for a placeholder where other layouts come later (such as the main frame of the activity).AbsoluteLayoutis deprecated, and should not be used.
RelativeLayout是你想要的。FrameLayout必须只有一个孩子，因此，通常仅用于其他布局稍后出现的占位符（例如活动的主框架）。AbsoluteLayout已弃用，不应使用。
RelativeLayoutallows the views to overlap, and allows doing, pretty much, anything you want.
RelativeLayout允许视图重叠，并允许做任何你想做的事情。
