How to reference from drawable to style
My app with tabs has two themes. In each theme tabs have different images in selected and unselected state. How I can properly reference to image by theme?
For example. I have in themes.xml
<?xml version="1.0" encoding="utf-8"?>
<style name="LightTheme" parent="@android:style/Theme.Light">
<item name="tabShows">@drawable/ic_tab_shows_unselected_light</item>
<item name="tabShowsSelected">@drawable/ic_tab_shows_selected_light</item>
<item name="tabNews">@drawable/ic_tab_news_selected_light</item>
<item name="tabNewsSelected">@drawable/ic_tab_news_unselected_light</item>
</style>
<style name="DarkTheme" parent="@android:style/Theme.Black">
<item name="tabShows">@drawable/ic_tab_shows_unselected_dark</item>
<item name="tabShowsSelected">@drawable/ic_tab_shows_selected_dark</item>
<item name="tabNews">@drawable/ic_tab_news_selected_dark</item>
<item name="tabNewsSelected">@drawable/ic_tab_news_unselected_dark</ite开发者_如何学JAVAm>
</style>
Also I have a tab_shows.xml and tab_news.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="@drawable/ic_tab_shows_selected_light"/>
<item android:state_selected="false" android:drawable="@drawable/ic_tab_shows_unselected_light" />
How I can reference to needed image in selector according to current theme? This not work for me
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="?tabShowsSelected"/>
<item android:state_selected="false" android:drawable="?tabShows" />
In layout files this works, I mean reference to style via ?styleName
Build your style A
and style B
in your case you put android:drawable="@drawable/ic_tab_shows_selected_light"
instead of background (I just copied snipets from my code)
#000
<style name="styleB">
<item name="android:background">#000</item>
</style>
your theme A
<style name="Theme.A">
<item name="pageBackground">@style/styleA</item>
</style>
theme B
<style name="Theme.Blue">
<item name="pageBackground">@style/styleB</item>
</style>
in your attr.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="pageBackground" format="reference" />
</resources>
finally in your widget you do style="?pageBackground"
You can find your answer here http://www.androidengineer.com/2010/06/using-themes-in-android-applications.html
Edit
(Additional information by Lukap in comments)
- Define one or more themes in
themes.xml
and set the definitions of your styles there. - Define custom attributes, a.k.a. custom styles, in
attrs.xml
. - Describe what the values of your custom styles are in
styles.xml
.
But you will need read more about the attrs.xml
<item name="android:background">? android:attr/activatedBackgroundIndicator</item>
</style>
Instead, we are referring to the value of some other attribute – activatedBackgroundIndicator
– from our inherited theme. Whatever the theme defines as being the activatedBackgroundIndicator
is what our background should be.
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