You can uninstall the app that you downloaded from Play Store. Android does not like updating Play Store version with local version and hence cannot install the app. Now you have created updated version and trying to install the updated version. You have installed your app from Play Store. Updating Play Store Version App With Local Version If you are updating an existing app, make sure you sign the app with the same certificate that you signed the previous version. App is Not SignedĮven when you create an app in “Release” mode, make sure that your apk file is signed with certificate. If you are not a developer and trying to install an app from your phone disk, there is a risk to install unknown app. Note: This article is intended for Android Developers Only.

I have encountered all the following situations and found the solutions. This error is generic and does not provide any details of why the app was not installed. If you are developing an Android app using any platform, root cause and solution for this error remains the same.

I have developed an app in Xamarin using Visual Studio but this error is related to Android App and not specific development platform. You have copied the apk on the phone, clicked on app to install and after sometime you get a message “App Not Installed”. You have developed an Android app, built the app in Release mode and you are ready to install it.

Xamarin build apk