Debug app blocked by play protect

Question

When trying to install a debugging application, "Playback Protection Alert" appears and the application is installed, but when I uninstalled the application, and try again to install it, it shows me an error.

Why did this error happen?

Error: Play Protect doesn't recognise this app's developer. Apps from unknown developers can sometimes be unsafe.

Answer 1

I was having the same problem. I did some research and found this:

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Expiry of the debug certificate

The self-signed certificate used to sign your app for debugging has an expiration date of 365 days from its creation date. When the certificate expires, you will get a build error.

To fix this problem, simply delete the debug.keystore file. The file is stored in the following locations:

• ~/.android/ on OS X and Linux
• C:\Documents and Settings\.android\ on Windows XP
• C:\Users\[user]\.android\ on Windows Vista and Windows 7, 8, and 10

The next time you build and run the debug build type, the build tools will regenerate a new keystore and debug key. Note that you must run your app, building alone does not regenerate the keystore and debug key.

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It worked for me. The source of my information is the official android developers site: https://developer.android.com/studio/publish/app-signing