"application Not Installed" When Installing An Self-signed Apk On Sd-card

* EDIT 1 * Of course, just after I posted i tried to uninstall the app, and then reinstall it from APK. Then it worked. Maybe its the fact that I usually install it from Eclipse th

Solution 1:

If the two .apks have different signatures (Eclipse uses a debug certificate), you will not be able to install/update with the new .apk without removing the previous one.

You can find more information about this here.

Solution 2:

The problem seems to be that I first installed the app via Eclipse (launching/debugging from Eclipse).

When the app was installed that way, and I then tried to reinstall from APK, it didn't work.

However, if I completely uninstalled the app first, then reinstalled from APK-file the installation was successful. It was also possible to reinstall (with an updated APK) after that!

Solution 3:

I also encountered this issue. Kindly try this solution. Make sure that the package name of your project is different from your previous project that was already installed in your mobile phone. I think they get conflict in their names. It resolved my problem.

Solution 4:

Try to not install your application via Eclipse. If you want to avoid situation when after update you have message "Application is not installed". Install application. Install only using export as apk options.

Solution 5:

create keystore file through command line

keytool -genkey -alias key_file_name.keystore -keyalg RSA -validity 1000000000000000 -keystore key_file_name.keystore

export apk through Eclipse, right click on Android project Android Tools > Export Signed Application Package, then give keystore location & password.

this will crate signed apk at the same time apk will be zipaligned. And installable.

If you go through command line for all, some times you may face "Application not installed" error. (Application not installed error can happen not only, when using command line. It can be some other reasons as well)