Android 如何在drawable中引用颜色属性？
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How to reference colour attribute in drawable?
提问by Michal
I would like to do a simple thing: Define a drawable which has exacly same background colour as system state-pressed background colour. I do it like this in res/drawables/my_drawable.xml:
我想做一件简单的事情：定义一个可绘制的，它的背景颜色与系统状态按下的背景颜色完全相同。我在 res/drawables/my_drawable.xml 中这样做：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_selected="true">
<color android:color="?android:attr/colorPressedHighlight"/>
</item>
<item android:state_selected="false">
<color android:color="@color/section_list_background"/>
</item>
</selector>
I always get:
我总是得到：
java.lang.UnsupportedOperationException: Cant convert to color: type=0x2
Any clues?
有什么线索吗？
Regards
问候
回答by petrsyn
You might need to do the following to fix your problem:
您可能需要执行以下操作来解决您的问题：
1) Define 2 colors for each theme in your colors file:
1) 为颜色文件中的每个主题定义 2 种颜色：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="my_color_dark">#ff33B5E5</color>
<color name="my_color_light">#ff355689</color>
</resources>
2) Create file res/values/attrs.xml with contents:
2) 使用内容创建文件 res/values/attrs.xml：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="my_color" format="reference" />
</resources>
3) Assuming you have 2 themes in your styles.xml (Theme.darkand Theme.light) define:
3）假设你的styles.xml（Theme.dark和Theme.light）中有2个主题定义：
<style name="Theme.dark" parent="@style/Theme.Sherlock">
<item name="my_color">@color/my_color_dark</item>
</style>
<style name="Theme.light" parent="@style/Theme.Sherlock.Light">
<item name="my_color">@color/my_color_light</item>
</style>
4) Use the color in a drawable:
4）在drawable中使用颜色：
<color android:color="?attr/my_color"/>
Hope this should fix your problem.
希望这应该可以解决您的问题。
回答by Sachin Gurnani
Just create a new color.xml file in /res/values/color.xmland put code like the following in it:
只需在其中创建一个新的 color.xml 文件/res/values/color.xml并将如下代码放入其中：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="editcolor">#ff99ffff</color>
<color name="transparent">#00000000</color>
</resources>
回答by XGouchet
You're trying to convert an attribute into a color. Attributes are properties usually attached to a view, which can then be styled using a theme.
您正在尝试将属性转换为颜色。属性是通常附加到视图的属性，然后可以使用主题设置样式。
You need to reference a color resource in your xml. You can do so by creating your own resource :
您需要在 xml 中引用颜色资源。您可以通过创建自己的资源来实现：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPressedHighlight">#FF8800</color>
</resources>
Then reference it like this :
然后像这样引用它：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_selected="true">
<color android:color="@color/colorPressedHighlight"/>
</item>
<item android:state_selected="false">
<color android:color="@color/section_list_background"/>
</item>
</selector>
Or you can reference a color available in the Android resources :
或者您可以参考 Android 资源中可用的颜色：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_selected="true">
<color android:color="@android:color/holo_orange_light"/>
</item>
<item android:state_selected="false">
<color android:color="@android:color/holo_blue_dark"/>
</item>
</selector>
回答by Alexander Blinov
you can't use ?attrin xml drawable resources because drawable resources created by aapt in compile time. Attr resources used for dynamic connection in runtime
您不能?attr在 xml 可绘制资源中使用，因为 aapt 在编译时创建的可绘制资源。用于运行时动态连接的 Attr 资源
回答by Dheeresh Singh
try this way put color in android:drawable as below
尝试这种方式将颜色放入 android:drawable 中，如下所示
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="?android:attr/colorPressedHighlight"/> <!-- pressed -->
<item android:state_focused="true" android:drawable="@color/blue"/> <!-- focused -->
<item android:drawable="@color/section_list_background"/> <!-- default -->
</selector>
or
或者
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:color="?android:attr/colorPressedHighlight"/>
<item android:state_enabled="false" android:color="@color/section_list_background" />
<item android:color="@color/testcolor5"/>
</selector>
