android themes - defining colours in custom themes

Question

I am sure there is a simple answer to that yet I just cant find it so I throw it into stackoverflow ... ;-)

I will just put it into an example. I have an android app where the user can choose the theme in the preferences - dark or light theme. Depending on the chosen theme I have to adjust 20 colors in my app. So I have the hope that I can define colours in the theme and then use the names of this so defined colours in the my TextViews etc. Yet so far I cant figure out how to do that and can't find any solution here and there. I really dont want to define an extra dark and light style for each of these 20 colours yet so far that seems the only solution I can find.

Big thanks for any hint

martin:

UPDATE:

In pseudo syntax is that is what I am looking for. Is it possible?

<style name="AppTheme.MyDark" parent="android:Theme">   -?-> titleColor = "#ffffff"   -?-> introColor = "#ffaaaa"   </style>  <style name="AppTheme.MyLight" parent="android:Theme.Light">   -?-> titleColor = "#000000"   -?-> introColor = "#004444"   </style>   <TextView         android:id="@+id/quoteTitle"         android:textColor=@titleColor         ... </TextView>  <TextView         android:id="@+id/quoteIntro"         android:textColor=@introColor         ... </TextView> 

Answer 1

I found a solution which seems to work. First you need to define the custom color fields in attr.xml

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

Next you define your themes

<style name="AppTheme.MyDark" parent="android:Theme">    <item name="titleColor">#FFFFFF</item>    <item name="introColor">#FFFFFF</item> </style>   <style name="AppTheme.MyLight" parent="android:Theme">    <item name="titleColor">#000000</item>    <item name="introColor">#004444</item> </style> 

and finally in your layout

<TextView     android:id="@+id/quoteTitle"     android:textColor="?titleColor"     ... </TextView>  <TextView     android:id="@+id/quoteIntro"     android:textColor="?introColor"     ... </TextView> 

i found the solution mainly here

There seems to be no explanation in the official android documentation about using attributes. Best resource I found is here