app namespace not found in styles.xml in res folder

Question

I'm writing my own toolbar with an android.support.v7.widget.Toolbar widget and I want to put as much as possible into a styles.xml in my res folder.

Part of a file in /res/layout/$example.xml

<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/toolbar_show_addresses_simple"     app:style="@style/toolbar_dark" > 

my "toolbar_dark" is defined as follows in a /res/values/styles.xml

<style name="toolbar_dark">     <item name="android:layout_width">match_parent</item>     <item name="android:layout_height">wrap_content</item>     <item name="android:background">@color/myPrimary</item>     <item name="app:theme">@style/ThemeOverlay.AppCompat.Dark</item>     <item name="app:popupTheme">@style/ThemeOverlay.AppCompat.Light</item>     <item name="app:contentInsetStart">0dp</item> </style> 

When compiling

  Output:      Error: No resource found that matches the given name: attr 'app:contentInsetStart'.      Error: No resource found that matches the given name: attr 'app:popupTheme'.      Error: No resource found that matches the given name: attr 'app:theme'. 

If I use the app:* values in $example.xml directly everything works fine. Therefore, how can I use my app namespace in files in the res folder?

Answer 1

You can't use an app namespace in your style file, and you should refer to style attribute wihtout app namespace in your layout.

You can do somenthing like this:

<android.support.v7.widget.Toolbar            xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:tools="http://schemas.android.com/tools"         android:id="@+id/toolbar_show_addresses_simple"         style="@style/toolbar_dark" > 

Style:

<style name="toolbar_dark" parent="Widget.AppCompat.Toolbar">     <item name="android:background">@color/green</item>     <item name="popupTheme">@style/ThemeOverlay.AppCompat.Light</item>     <item name="theme">@style/ThemeOverlay.AppCompat.Dark</item> </style>