Custom component namespace invokation

Question

I am having problem with invoking a custom component in my Android projects in Eclipse. It seem that I do not understand how the namespace declarations belong together. I have checked several other threads here at SO, which at first seem to be related, but I cannot solve my problem with these:

• android-custom-control-namespace-issue
• how-to-pass-custom-component-parameters-in-java-and-xml
• android-custom-widget-styles-how-to-put-them-into-a-namespace

I have the following set-up (code is anonymized):

/values/extra_attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="extraComponent">
        <attr name="count" format="integer" />
    </declare-styleable>
</resources>

/layout/extra_main.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">    
    <ImageView
        android:id="@+id/extra_main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/extra_main" 
    />        
</merge>

/com.site.package.extra/extra.java

package com.site.package.extra;

... misc imports...

public class Extra extends FrameLayout
{
... misc code...
}

/com.site.package/main.java (start-up class)

package com.site.package;

... misc imports...

public class Main extends Activity
{
... misc code...
}

/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  style="@style/main_style" 
  xmlns:extra="http://schemas.android.com/apk/res/com.site.package" >

  <com.site.package.Extra
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    extra:count="3">
  </com.site.package.Extra>
</RelativeLayout>

The problem I face is; whatever I do, I cannot manage to invoke my custom component. The errors occur in may layout and I have tried to change the following items:

1. name space declaration
   • xmlns:extra="http://schemas.android.com/apk/res/com.site.package"
   • xmlns:extra="http://schemas.android.com/apk/res/com.site.package.extra"
   • xmlns:extra="http://schemas.android.com/apk/res/extra"
2. component invokation
   • <com.site.package.extraComponent />
   • <com.site.package.Extra.extraComponent />
   • <extraComponent />
   • <Extra.extraComponent />
   • <android.view.ext.extraComponent />
3. attributes
   • extra:count="3"
   • com.site.package.extra:count="3"

In neither case I manage to get any help from intellisense so I am completely lost. I really do not understand how the namespaces are working here and how I should put the code to work.

EDIT :

I forgot to include my AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.site.package"
  android:versionCode="1"
  android:versionName="1.0" >

  <uses-sdk android:minSdkVersion="7" />

  <application
    android:icon="@drawable/ic_logo"
    android:label="MyApp"
    android:name="MyApp" >

  <activity
    android:label="MyApp"
    android:name=".Main" >
    <intent-filter >
      <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
  </activity>
</manifest>

Answer 1

Your custom component is situated in the package com.site.package.extra(from the code you posted) so you could use it in the xml layout with:

<com.site.package.extra.Extra // ... other attributes

or with:

<view  class="com.site.package.extra.Extra"
     // ... other attributes />

The namespace for the custom attributes:

xmlns:extra="http://schemas.android.com/apk/res/com.site.package"

and to use them:

extra:count="3"