How Do I Prevent My App From Uninstalling?

I am working on a security app. everything is fine, except there is a backdoor. the security can be easily removed by just uninstalling the app. is there a way i can protect my app

Solution 1:

Please refer Device Administrator

Once the application is registered as a Device Administrator, it can't be uninstalled unless its unregistered. This will prevent the app from being uninstalled.

For example this application is using same functionality.

Make sure if you install above application(SeekDroid) you must sign up then it will ask for device admin permission. :)