Putting of default SMS notification

What I am trying to do is developing an SMS notification system for our own application, whenever the sms is received from a specified number the application gets invoked but the problem is that whenever the sms arrives from any other number then also the appli开发者_开发问答cation gets invoked and that is undesirable. I would be grateful to hear from u all .

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Read this question and answers: how to stop the application from opening in android

Basically you need to extract the number from the message and if it is a number you are interested in, then you start your application, otherwise not.