视图上的 Android 浮动按钮
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Android floating buttons over a view
提问by Thebestshoot
I was trying to have a floating button on my view, I googled and found this link which pretty well sums it up.
我试图在我的视图上有一个浮动按钮，我用谷歌搜索并找到了这个链接，它很好地总结了它。
http://www.jondev.net/articles/Floating_Views_in_Android_(Buttons)
http://www.jondev.net/articles/Floating_Views_in_Android_（按钮）
While this is true for one button, but what if i want to have two floating buttons one at "top left" and another at "bottom right".
虽然这对于一个按钮是正确的，但是如果我想有两个浮动按钮，一个在“左上角”，另一个在“右下角”，该怎么办。
I thought of having a relative layout which has two buttons with lay out gravities different. Will this work. I tried it and miserably failed. Has any one else tried to do this? Is there any way of doing this, if so please let me know.
我想有一个相对布局，其中有两个按钮的布局重力不同。这会起作用吗。我试过了，惨遭失败。有没有其他人尝试过这样做？有没有办法做到这一点，如果有，请告诉我。
回答by Thommy
You can achive that with a RelativeLayout:
您可以通过以下方式实现RelativeLayout：
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="15dp"
android:layout_marginRight="15dp"
android:text="Button" />
</RelativeLayout>
Note that the last added Widget is on top.
请注意，最后添加的 Widget 位于顶部。
回答by avimak
You can do it with RelativeLayoutalthough you can also achieve that using FrameLayout(like in the example in your the link).
In FrameLayoutSet a proper gravity to the the buttons (Gravity.BOTTOM|Gravity.RIGHT, or via XML...), and in RelativeLayoutset the reuiqred rules to the Buttons:
您可以使用它RelativeLayout来实现，尽管您也可以使用它来实现FrameLayout（如链接中的示例）。在FrameLayout为按钮设置适当的重力（Gravity.BOTTOM|Gravity.RIGHT，或通过 XML ...），并将RelativeLayout所需的规则设置为按钮：
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
etc.
等等。
回答by IronBlossom
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ListView
android:id="@+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="15dp"
android:layout_marginLeft="15dp"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="15dp"
android:layout_marginRight="15dp"
android:text="Button" />
</RelativeLayout>
