android - 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>