Question

Is it possible to have a class extending SurfaceView within the activity class as an inner class? Something like this:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.android.iiProject.Presentation.DrawCanvas
android:id="@+id/SurfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>

Where the Presentation is the activity class, and the DrawCanvas is the class extending the SurfaceView, and a DrawCanvas object is called from within the Presentation activity.

I want it this way because I want to have access to methods and variables available from within the Presentation activity, and I don’t want to declare them as static to reach them from the other class, since that causes me a lot of additional problems…!
This way it’s giving me classNotFoundException at the XML file

Thanks a lot in advance

Answer 1

Yes, that’s possible, you just have to adress you inner class in a different way from XML, like this:

<view
  class="com.yourpackage.YourOuterClass$YourInnerClass" 
  ...
  />

Quote:

The custom component is created as a generic view in the XML, and the
class is specified using the full package. Note also that the inner
class we defined is referenced using the NoteEditor$MyEditText
notation which is a standard way to refer to inner classes in the Java
programming language. If your custom View component is not defined as
an inner class, then you can, alternatively, declare the View
component with the XML element name, and exclude the class attribute.

See modifying an existing view type, point 4.