App not Installed Error on Android

Question

I have a program working in the Android Emulator. Every now and again I have been creating a signed .apk and exporting it to my HTC Desire to test. It has all been fine.

On my latest exported .apk I get the error message 'App not installed' when I try to install the .apk. It runs fine on the emulators.

As I have mainly been testing on the emulators and only every now and again exporting to a real phone I am not sure when this happened. What is the likely cause of it not installing on a physical phone but running fine in the emulators?

I have tried rebooting the phone & removing the existing .apk, does not fix the fault.

Answer 1

In order to allow installation of apps from other sources, open the Settings app and locate "Install Unknown Apps" under Privacy/Security settings. Enable the permission for the app which you use to install your APK. In most cases, this is the app being updated, a file manager or the browser.