MonoDroid how to use custom attributes inside a layout axml file? - xamarin.android

Question

I am trying to convert the DragnDrop listview from here https://github.com/commonsguy/cwac-touchlist to C# with Mono for Android.
Part of this custom View requires the use of some custom attributes that are declared as the following inside the file Resources/values/attrs.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TouchListView">
<attr name="normal_height" format="dimension" />
<attr name="expanded_height" format="dimension" />
<attr name="grabber" format="reference" />
<attr name="dragndrop_background" format="color" />
<attr name="remove_mode">
<enum name="none" value="-1" />
<enum name="fling" value="0" />
<enum name="slide" value="1" />
<enum name="slideRight" value="1" />
<enum name="slideLeft" value="2" />
</attr>
</declare-styleable>
</resources>
I then try to use them inside my layout file like this:
<app.monodroid.TouchListView xmlns:tlv="http://schemas.android.com/apk/res/app.monodroid"
android:id="#+id/lstExercises"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="#+id/lExerciseActions"
android:drawSelectorOnTop="false"
tlv:normal_height="64dip"
tlv:grabber="#+id/icon"
tlv:remove_mode="slideRight"
/>
But when I try to build my project I get the following error message:
/Library/Frameworks/Mono.framework/External/xbuild/Novell/Novell.MonoDroid.Common.targets: Error: Tool exited with code: 1. Output: /Users/path_to_project/App.MonoDroid/obj/Debug/res/layout/add_session.axml:1: error: No resource identifier found for attribute 'normal_height' in package 'com.app.monodroid'
/Users/path_to_project/App.MonoDroid/obj/Debug/res/layout/add_session.axml:1: error: No resource identifier found for attribute 'grabber' in package 'com.app.monodroid'
/Users/path_to_project/App.MonoDroid/obj/Debug/res/layout/add_session.axml:1: error: No resource identifier found for attribute 'remove_mode' in package 'com.app.monodroid'
(App.MonoDroid)
The name of my project is App.MonoDroid.
How can I use these attributes inside my layout file?

Answer 1

These errors should go away if you declare a package name for your app. In the project properties, go to the Android Manifest tab, and you'll see a text field for Package Name:

Answer 2

... and then make sure you use this package name for your assembly and namespace:
and use it in your xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/**app.monodroid**"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<**app.monodroid**.FICalendarView
android:id="#+id/FICalendar"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
custom:dayStyle="1">
</**app.monodroid**.FICalendarView>
<Button
android:id="#+id/MyButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/Hello"/>
</LinearLayout>
where FICaldendarView is a custom view defined as:
namespace app.monodroid
{
public class FICalendarView : View
{
//private FICalenderView() {}
public FICalendarView(Context context)
: base(context)
{
}
public FICalendarView(Context context, Android.Util.IAttributeSet attribute)
: base(context, attribute)
{
Android.Content.Res.TypedArray a = context.Theme.ObtainStyledAttributes(attribute, Resource.Styleable.FICalendarView, 0, 0);
//Android.Util.TypedValue typedValue = null;
int dayStyle = a.GetInteger(Resource.Styleable.FICalendarView_dayStyle,0);
}
public FICalendarView(Context context, Android.Util.IAttributeSet attribute, int x)
: base(context, attribute,x)
{
}
}
}