按钮始终显示在FrameLayout的顶部 [英] Button always displays on top in FrameLayout

问题描述

我有这样的FrameLayout:

I have FrameLayout like this:

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="changeColor"
        android:text="new button"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="some text"/>

</FrameLayout>

问题在于，当FrameLayout类概述告诉我们时，按钮显示在顶部:子视图是在堆栈中绘制的，最近添加的子视图在顶部".

The problem is that the button is displayed on top while FrameLayout class overview tells us this: "Child views are drawn in a stack, with the most recently added child on top".

推荐答案

此答案

Lollipop及更高版本中的按钮具有默认的标高，即 使它们始终位于顶部.您可以通过覆盖来更改此设置 默认的StateListAnimator.

Buttons in Lollipop and higher have a default elevation to them which causes them to always draw on top. You can change this by overriding the default StateListAnimator.

尝试将其放入按钮XML:

Try putting this into your button XML:

android:stateListAnimator="@null"

FrameLayout现在应该覆盖 按钮.

The FrameLayout should now cover the button.

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