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Find apps blocking APK install button

I had a problem the other day.. Android has a protection against malicious apps doing overlay (screen filters, buttons etc); when installing custom APK, you can't press Install button. On my phone I had to install an app to list all apps having the overlay permission, specifically this:
Advanced Permission Manager
After filtering which apps could do that, I was able to pinpoint the problem app and use Titanium Backup to freeze it (check if it is the guilty one).

I'd be happy if you could share what apps you've found out could do that for others to know.
In my case it was Lux Auto Brightness (1.75) [CM 12.1/Android 5.1]; after I upgraded it, the problem has disappeared (it disables itself automatically when an installation is detected).

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Coffee phreak!


Very nice, thanks for the post

I have allowed the installation of applications from unknown applied actions in settings, but I can't seem to press the install button. The cancel button works correctly and installing applications via adb install works correctly. What's the problem?

papa's pizzeria is a simulation game centered around the management of an ice cream parlor, whereby the player assumes the role of a proprietor responsible for overseeing the operations of a dessert establishment and ensuring the provision of preferred confections to all patrons.

The install button won't seem to work even though I've permitted the installation of apps from unidentified applied activities under settings. doodle jump

How to Find apps blocking APK install button
1. Turn on the switch on top-right corner in the screen of the "Install Button Unlocker".
2. Accessibility screen is opened. Please select the "Install Button Unlocker" item from the list.
3. Turn on the switch on the top-right corner.
4. "Use Install Button Unlocker?" dialog is displayed. Then choose OK button.
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