android - 使用支持v7在xml中应用selectableItemBackground

Question

即使我的应用程序中包含android支持v7

加入 android:background="?android:attr/selectableItemBackground"

使我的IDE,Eclipse抛出错误(阻止我编译),通知我selectableItemBackground仅适用于最小Api 11及以上.

如何将此属性添加到XML中的背景？

假设从较高的库复制和粘贴不是解决方案

Answer 1

由于属性是在库(支持v7)中定义的,因此您可以将其用作用户定义的属性:即没有android:前缀:

android:background="?attr/selectableItemBackground"

您看到的错误指出?android:attr/selectableItemBackground可用于API版本> = 11.确实如此.

Answer 2

这是selectedItemBackground.您可以在/platforms/android-14/data/res/themes.xml中找到它

<selector xmlns:android="http://schemas.android.com/apk/res/android"
          android:exitFadeDuration="@android:integer/config_mediumAnimTime">

    <item android:state_window_focused="false" android:drawable="@color/transparent" />

    <!-- Even though these two point to the same resource, have two states so the drawable will invalidate itself when coming out of pressed state. -->
    <item android:state_focused="true"  android:state_enabled="false" android:state_pressed="true" android:drawable="@drawable/list_selector_background_disabled" />
    <item android:state_focused="true"  android:state_enabled="false"                              android:drawable="@drawable/list_selector_background_disabled" />
    <item android:state_focused="true"                                android:state_pressed="true" android:drawable="@drawable/list_selector_background_transition" />
    <item android:state_focused="false"                               android:state_pressed="true" android:drawable="@drawable/list_selector_background_transition" />
    <item android:state_focused="true"                                                             android:drawable="@drawable/list_selector_background_focused" />
    <item android:drawable="@color/transparent" />

</selector>

你可以在Android SDK目录中找到drawables

../platforms/android-14/data