public String getNamespaceUri() {
        return nsIdx >= 0 ? strings[nsIdx] : null;
    }
a class to read android axml

@author <a href="mailto:pxb1988@gmail.com">Panxiaobo</a>
android/third_party/apkbuilder/src/main/java/pxb/android/axml/AxmlParser.java