inheritance with android style

Question

I have defined red color to contentBg style for TextView. Can i change the TextView color red to blue by changing or renaming style name myContentNew from the parent style? The TextView style name-contentBG should not be changed. Is it possible in android sytle.

<RelativeLayout 
   style="@style/myContent"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content">
<TextView 
   style="@style/contentBG"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"/>
</RelativeLayout>

My code should be like below

<RelativeLayout 
       style="@style/myContentNew"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content">
    <TextView 
       style="@style/contentBG"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"/>
 </RelativeLayout>

You can get clear idea with my attached image. enter image description here

like CSS:

.myContent .contentBg{background-color:red}
.myContentNew .contentBg{background-color:blue}

Thanks

It seems you are tryin to setup a theme right? Do you need to do this in one layout or all the layouts? — Yoann Hercouet
– Yoann Hercouet, Commented May 28, 2013 at 6:20
Actually i would like to use this as active or inactive state with the above requirements — Pavan Kumar
– Pavan Kumar, Commented May 28, 2013 at 6:36
I don't think you can setup this kind of inheritance directly. The only way I see is to setup 2 themes and use styles as references that will change according to the theme selected. — Yoann Hercouet
– Yoann Hercouet, Commented May 28, 2013 at 7:43

icodesign · Accepted Answer · 2013-05-28 06:43:58Z

1

I'm afraid not.

Once the contentBG style is set. It can't be changed but in code.

answered May 28, 2013 at 6:43

icodesign

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Comments

Yoann Hercouet · Accepted Answer · 2013-05-28 08:31:06Z

Here is an example with the creation of 2 different themes:

You need first to modify your manifest file to call the default custom theme, for example:

<application
    android:name="RateDayApplication"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/CustomTheme" >

Then, in your styles.xml file, prepare 2 different themes, containing the same style contentBG:

<!-- *** THEME WITH RED BG*** -->
<style name="CustomTheme" parent="@android:style/Theme.Holo.Light">
    <item name="contentBG">@style/contentBGred</item>

</style>

<style name="contentBGred" >
    <item name="android:colorBackground">@color/red</item>
</style>

<!-- *** THEME WITH BLUE BG*** -->
<style name="CustomThemeNew" parent="@android:style/Theme.Holo.Light">
    <item name="contentBG">@style/contentBGblue</item>
</style>

<style name="contentBGblue" >
    <item name="android:colorBackground">@color/blue</item>
</style>

IMPORTANT: here I use Theme.Holo.Light as parent theme, you can change it if you are using a different one.

In the 2 themes above, the style has the same name, it will be use as a reference in your XML files. In order to declare this reference, you must add it in the file untitled attrs.xml under your values folder.

Here is the content:

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

Once it is done, you just need to call this style this way in your XML files (you don't need the style on the layout anymore):

<RelativeLayout 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content">
<TextView 
   style="?contentBG"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"/>
</RelativeLayout>

The question mark here means that the style will be loaded using a reference. The style that will be used will be the one of the current theme applied on the Activity.

You can easily setup the theme you want on your activity using this way:

setTheme(R.style.CustomTheme);

or

setTheme(R.style.CustomThemeNew);

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