After last post, I found SAX namespace handling method can be changed with SAXParserFactory#setNamespaceAware() function. 

    SAXParserFactory factory = SAXParserFactory.newInstance();
    factory.setNamespaceAware(true); // Added
    SAXParser parser = factory.newSAXParser();

This setting specify whether the parser supports XML namespaces or not and default value is false.

Following table is the result of namespace-less "<test>" tag.

NamespaceAware TRUE FALSE
uri "" ""
localName "" "test"
qName "test" "test"

Note that: On Android 1.5, calling SAXParserFactory#setNamespaceAware() throws SAXNotSupportedException "The 'namespace-prefix' feature is not supported while the 'namespaces' feature is enabled.". We SHOULD USE newer Android OS.