How does Whatsapp detects any newly added number using the app very quickly, and shows an icon in contact details immediately. I am not asking how to do it but my question is how to do it as fast as whatsapp does ?
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you can set `ContentObserver` to receive listener on contact change, see http://stackoverflow.com/questions/5996921/how-do-i-make-my-android-contentobserver-for-contactscontract-detect-a-added-up for more info – Shayan Pourvatan Oct 31 '15 at 12:05
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@shayanpourvatan i am not asking how i can achieve it but my question is how to so it as fast as whatsapp do you have any idea ? because i have done it but its not working so fast – Akshay Panchal Oct 31 '15 at 12:10
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I would guess it is listening for contact changes or just checks each time it opens for any differences. (Can't comment yet so delete this if wrong)
AKTheKnight
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