How do I fix the com.example problem?

If you have your own internet domain you can use that, reversed of course. That's the long established standard specified in Java by Sun/Oracle: https://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html It would look like

package com.sethkroger.funfacts;

Without owning a domain you can make up a package name prefix. I recommend that instead of using a domain you don't own. For instance I could start with sethk.apps for apps by me. Then the package would be:

package sethk.apps.funfacts;

also see for other perspectives:

http://stackoverflow.com/questions/12535798/whats-the-convention-for-java-package-names-without-a-domain-association

http://stackoverflow.com/questions/292169/what-package-naming-convention-do-you-use-for-personal-hobby-projects-in-java?rq=1

I found out that I also messed up the gradle on the class path. How do I name it correctly again? Also I renamed the Apk "Overmind121-release" still no luck.

Code:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript { repositories { jcenter() } dependencies { classpath 'com.Overmind121'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

}

allprojects { repositories { jcenter() } }

task clean(type: Delete) { delete rootProject.buildDir }

should be

    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.2'

What's the exact error message? are you unable to compile the apk or is the apk being rejected? Does the app name in build.gradle and the manifest match the new package?

There are two issues I can think of: 1) package names are supposed to be all lowercase (see the Oracle doc I linked to above) 2) Chrome throws a hard "Deceptive Site" warning if you try to go the the domain, one of many reasons for my advice to never use a domain you don't own.