[Solved-4 Solutions] App not Installed Error on Android



Error Description:

  • When we try to install an apk on our device we get the error message 'App not installed' It runs fine on the emulators.

Solution 1:

  • It might be because you are trying to install an apk on a phone with a previous version of the same apk, and both apks hadn't been signed with the same certificate. Are you using the same certificate

Solution 2:

  • This can happen if you have your MainActivity declared twice in your AndroidManifest.xml.
  • Another possible reason: you changed the launch activity.

Solution 3:

  • The app might be needed to sign. Hence, sign the app and then try to install it on your phone.

Solution 4:

  • If application's not installing, delete the file .android_secure/smdl2tmpl.asec from the SD card.
  • If the folder .android_secure is empty in the file manager, delete it from the PC.

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