Catch USB keyboard's event and show a pop-up/windows

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Dec 2, 2015 7:11:12 PM via Website

Hi all,

I am working on an android device having lollipop 5.1.1 OS. I have connected an external USB keyboard to the device. What I want to do is when user press F1 key in test field of any app(messaging/email), I want to receive the key press event and want to show a simple pop-up/ windows on screen. User should be able to navigate through this window.

How to achieve the above use case ? Use case should be common for all application.