Register Application class in Manifest?

If it derives from Application, add the fully qualified (namespace + class name) as the android:name parameter of the application element in your manifest.

<application
        android:name="com.you.yourapp.ApplicationEx"

Or if the class’ package can be described as relative to the package in the manifest tag, then just start with a .:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.you.yourapp">

    <application
        android:name=".ApplicationEx"