Take a Screenshot on Android By Tapping Back of the Phone
To get started download and install the Tap Tap app from XDA Developers. Note that you will need to sideload it to work since this isn’t coming from the Google Play Store. It’s also worth noting that the Tap, Tap app is still in beta and it might not work with every Android phone. For best results use a Pixel 3 or higher device. But I was able to get it to work without any problems on a OnePlus 6T.
To sideload the app open a browser on your Android phone and head to this XDA Developers link. A notification will appear – tap it to install the APK. Then you will need to give your browser permission to install apps from unknown sources.
Once you have Tap, Tap installed you need to enable the Accessibility Service which is disabled by default. Simply tap the notification and enable it. It is not available in PLAYSTORE
