Android themes trouble implementing the simplest: custom per theme color -

i'm beginner in android development and, although coding makes perfect sence, android themes imho don't

i have trouble implementing simple task:

i have (for example) color named "blah"

<?xml version="1.0" encoding="utf-8"?> <resources>   <color name="blah">#f0f0f0</color> <resources> 

which used everywhere in xml layouts or code , different view complonents "@color/blah"

i make color value change per-theme

so when use mytheme1, blah should #f0f0f0 , when use mytheme2 blah should #00ff00

i've been reading themes , still cant find out how implement simple task, since app not require special styles , on, per-theme colors.

thanx in advance

update:

after link provided mohamed_abdallah, managed create custom colors defining them in attrs.xml , styles.xml:

attrs.xml

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

styles.xml

<style name="appbasethemedark" parent="android:theme.black"> <item name="color_item_title">@color/white</item>                       </style> 

but more serious problem arises

i can use color ?color_item_title in every view, buttons , text gets color.

but using ?color_item_title on custom drawables or listview layouts (that views inflated during runtime) causes crash.

so using ?color_item_title inside listview listitem layout crashes @ runtime inflater message @ line :(

it crashes @ drawables: (inflation error again)

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >  <solid android:color="@color/black" /> <corners     android:bottomleftradius="8dp"     android:bottomrightradius="8dp"     android:topleftradius="8dp"     android:toprightradius="8dp" />  <stroke android:width="1dp" android:color="?color_item_title" /> </shape> 

after searching , trying, got tip there things can , some things cant.

you can

a) define own attributes in attrs

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

b) set values in styles.xml

<style name="appbasethemedark" parent="android:theme.black">            <item name="color_gallery_backround">@color/white</item>                </style>  <style name="appbasethemewhite" parent="android:theme.light">            <item name="color_gallery_backround">@color/black</item>                </style> 

c) use them in view ?color_gallery_backround or ?attr/color_gallery_backround example

android:background="?attr/color_gallery_backround" 

you cant

a) cant access attribute custom drawables, not valid during inflation

so you cant use ?attr/color_gallery_backround in here:

customshape.xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >  <solid android:color="**?attr/color_gallery_backround**" />  <stroke android:width="2dp" android:color="@color/black" /> </shape> 

b) cant access attribute in view inflated during (for example) listview listitem view

so theme "support" attributes @ least api 10 has depth limits.

solutions

as suggested, have create 2 separate drawables using different colors , set attributes reference these drawables according theme:

attrs.xml

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

and on each theme, setup actual drawable use in styles.xml:

<resources>      <style name="appbasethemedark" parent="android:theme.black">            <item name="rounded_background">@drawable/round_rect_shape_dark</item>                </style>      <style name="appbasethemelight" parent="android:theme.light">            <item name="rounded_background">@drawable/round_rect_shape_white</item>                 </style>  </resources> 

now can reference drawable ?rounded_background , let theme choose it.

for inflated views inside listview listitem layouts, have programmatically set colors.