Android Cloud to Device Messaging (C2DM) - TutorialAndroid C2DMs This tutorial describes how to push information from a server to the Google device. It is based on Eclipse 3.7, Java 1.6 and Android 2.3 (Gingerbread). Most mobile apps require data from the Internet. One approach for updating its data is that the apps periodically polls a server for new data (Polling). If no new data is available this approach uses unnecessary network bandwidth and
https://blogs.oracle.com/otnjp/post/oracle-sql-image-001
