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How exactly this quering is going to help for retreiving the messages instantly ?
I have skipped the videos ,just came here to see how you are going to send and receive messages ,so as expected you have saved the data in the parse.com ,but when you are retreiving them ,you queried it on resume ,that's ok ,but when i send some a message ,that does mean that only when they open the app the message will be sent to them right ?not like a notification will be sent to them ?
In the final Android project, "Implementing Designs for Android" notifications are added to the self-destructing message app.