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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.
I had the same issue, i.e. App showed up as being installed, but would not launched when the icon was tapped. After some head-banging, I found that I had stupidly placed ' android:exported="false" ' for my main launcher activity within the AndroidManifest file.... Once I removed it, the App launched fine..
This can happen if you have your MainActivity declared twice in your AndroidManifest.xml.
Another possible reason: you changed the launch activity. Hint: never do it with already published applications! Reasons discussed in Android Developers blog.
The "Application not installed" error can also occur if the app has been installed to or moved to the SD card, and then the USB cable has been connected, causing the SD card to unmount.
Turning off USB storage or moving the app back to internal storage would fix the issue in this case.
Check with the Android version.
If you are installing non-market apps, and incompatible version you will get this error.
Ex: Application targetted to 2.3.4 Your device is 2.2 Then you will get this error.
I had the same type of error this was cauysed by this line in my android manifest XML file.
I removed the line and it solved my issue. Hope this helps
I know this is an old post, but for new users may be useful. I had the same problem: my application worked fine while debbuging. When I signed the APK I got the same message: "Application not installed".
I fixed that uninstalled my JDK (I was using jdk-6u14-windows-x64) and installed a new one (jdk-6u29-windows-x64). After export and sign the APK again, everything was ok!
Resuming, my problem was in JAVA version. Thank's Oracle!!