How do i stop qr reader app adds to pop up on my screen??

[Android Central Question]

I just once used qr reader app downloaded and then immediately uninstall that bit from then the adds never comes to end and popup on my screen every second i have done everything but cant stop that please help!!!

 

[B. Diddy]

Welcome to Android Central! See this: Full screen ads. How to find the culprit. - Android Forums at AndroidCentral.com

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[mustang7757]

Which device you have?