定义特定的视图样式以在主题内使用 [英] Define specific view style to use inside theme

问题描述

我想为一个应用添加多个主题，并且可以通过编程方式进行选择.

I'd like to add more than one theme for an app, selectable programmatically.

如何在这些主题中为特定视图定义样式?

How can I define a style for a specific view inside those themes?

假设我有一个ImageView，它在my_layout.xml中显示徽标:

Let's say I have an ImageView that show a logo in my_layout.xml:

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

    <ImageView 
        android:layout_width="250dp"
        android:layout_height="250dp"

        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"

        android:src="@drawable/ic_logo"
        android:contentDescription="@string/app_name"
        />
    <!-- ...other views... -->
</RelativeLayout>

如何更改ImageView的src来更改主题?

How can I change the src of the ImageView changing the Theme?

是否可以为主题定义自定义元素，以便随后将其应用于特定视图?

Is there a way to define custom elements for a theme so that I can then apply to a specific view?

类似的东西:

<resources xmlns:android="http://schemas.android.com/apk/res/android">

    <style name="MyTheme" parent="android:Theme.Holo.Light">
        <item name="logoImageView">@style/baseLogoImageView</item>
    </style>

    <style name="baseLogoImageView">
        <item name="android:src">@drawable/ic_logo</item>
    </style>

</resources>

，然后在my_layout.xml中使用它:

...
<ImageView style="@style/logoImageView"
...

上面的例子没有用；我遗漏了一些东西，还是无法达到那个结果?

The above example didn't work; I'm missing something or it isn't possible to achieve that result?

谢谢.

推荐答案

我自己根据声明用作样式引用的属性:

Declare attribute to use as style reference:

<declare-styleable name="CustomThemeViews">
    <attr name="myViewStyle" format="reference"/>
</declare-styleable>

为每个主题定义样式:

<style name="myViewStyleTheme01">
    <item name="android:background">#f00</item>
</style>

<style name="myViewStyleTheme02">
    <item name="android:background">#0f0</item>
</style>

定义引用不同样式的主题:

Define themes that refer to different styles:

<style name="AppTheme" parent="android:Theme.Light">
    <item name="myViewStyle">@style/myViewStyleTheme01</item>
</style>

<style name="AppThemeAlternative" parent="android:Theme.Light">
    <item name="myViewStyle">@style/myViewStyleTheme02</item>
</style>

在布局中使用主题样式

<ListView style="?attr/myViewStyle"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ...

现在，应用于ListView的样式根据所应用的主题而改变.

Now the style applied to the ListView changes according to the theme applied.

这篇关于定义特定的视图样式以在主题内使用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！