所选部件的主题相关的色彩 [英] Theme dependent colors of selected widgets

问题描述

我是pretty的肯定，这个问题已经被回答的地方。它只是似乎太普通了。但我无法找到答案。我也不能找出解决方案。

I'm pretty sure that this question already has been answered somewhere. It just seems too common. But I can't find the answer. I can't also figure out the solution.

下面的问题：

我想我的TableRow的之一，有不同的背景颜色。这很简单，我只需要添加

I want one of my TableRow's to have different background color. It's simple, I just need to add

android:background="#123456" 

在的TableRow的XML声明。但是，我也希望我的应用程序有两个主题。在其它主题，的TableRow应该有不同的背景颜色。我无法找到一个方法来确定一个主题内的色彩值，并使用它。我想输入的东西是这样的：

In TableRow's XML Declaration. But, I also want my application to have two themes. In the other theme, the TableRow should have different background color. I just can't find a way to define a color value inside a theme and use it. I would like to type something like this:

<style name="Theme.MyApp" parent="@style/Theme.Light">
   <color "my_cool_color">#123456</color>
</style>

<style name="Theme.MyApp.Dark" parent="@style/Theme.Dark">
   <color "my_cool_color">#654321</color>
</style>

和中的TableRow的声明：

And, in TableRow's declaration:

android:background="@color/my_cool_color"

所以，当我改变了主题，那一个的TableRow的背景的颜色也会改变。我试过在很多方面为许多小时，没成功......有一件事我没有尝试，在创造上的TableRow我自己的小部件筑底并为它宣布独立的风格 - 我认为这应该工作，但它的这么简单的问题太沉重的解决方案。

So, when I change the theme, the color of that one TableRow's background also changes. I've tried in many ways for many hours and didn't succeed... One thing I didn't try, was creating my own widget basing on TableRow and declaring a separate style for it - I think this should work, but it's just too heavy solution for so simple problem.

推荐答案

您可以使用属性做到这一点。首先定义在 attrs.xml 的属性（这个文件去的价值文件夹下）：

You can do this using attributes. First define your attribute in attrs.xml (this file goes under the 'values' folder):

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="myCoolColor" format="color" />
</resources>

然后在你的 styles.xml ，定义 myCoolColor 为每个主题：

Then in your styles.xml, define myCoolColor for each theme:

<style name="Theme.MyApp" parent="@style/Theme.Light">
   <item name="myCoolColor">#123456</item>
</style>

<style name="Theme.MyApp.Dark" parent="@style/Theme.Dark">
   <item name="myCoolColor">#654321</item>
</style>

现在，指定 myCoolColor 为您的视图的背景：

Now, specify myCoolColor as the background of your view:

android:background="?myCoolColor"

您可以更进一步，并使用引用颜色，所以你可以保持你的颜色在一个地方定义。更改属性中提及（请注意，我们可以使用一种颜色或引用）：

You can go further and use a reference to a color so you can keep your colors defined in one place. Change the attribute to include a reference (note that we can use a color OR a reference):

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="myCoolColor" format="color|reference" />
</resources>

更改 styles.xml 引用的每个主题颜色：

Change your styles.xml to reference a color for each theme:

<style name="Theme.MyApp" parent="@style/Theme.Light">
   <item name="myCoolColor">@color/blue</item>
</style>

<style name="Theme.MyApp.Dark" parent="@style/Theme.Dark">
   <item name="myCoolColor">@color/green</item>
</style>

最后定义的颜色你的 colors.xml ：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="blue">#0000FF</color>
    <color name="green">#00FF00</color>
</resources>

这就是它！

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