Change Security Settings

Security settings protect your app from piracy. They live in MainActivity.kt, inside your package folder (app/src/main/kotlin/com/yourname/yourapp/).

override val billingEnabled = true

override fun amazonInstallsEnabled(): Boolean = false
override fun checkLPF(): Boolean = true
override fun checkStores(): Boolean = true

override fun getLicKey(): String? = "MIIBIjANBgkqhkiGgKglYGYGihLuihUuhhuBlouBkuiu"

override fun getLicenseChecker(): PiracyChecker? {
    destroyChecker() // Important
    return if (BuildConfig.DEBUG) null else super.getLicenseChecker()
}

Settings

Setting	When true	Default
billingEnabled	Turns on in-app purchases. See Use Donations	true
amazonInstallsEnabled	Allows installs from the Amazon Appstore. Turn it on if you publish there	false
checkLPF	Blocks the app if Lucky Patcher (a popular piracy tool) is installed	true
checkStores	Blocks the app if a third-party store known for pirated apps is installed, like Aptoide	true

License key

The license checker blocks your app if it wasn’t installed from Google Play. It needs your app’s license key, and so do donations. The key in the sample isn’t valid, so replace it:

1. Create your app in the Google Play Console.

2. Go to Monetize with Play → Monetization setup and copy the Licensing key.

3. Paste it in getLicKey, keeping the quotes:

   override fun getLicKey(): String? = "your-license-key"

Turn the license checker on or off

By default, the license checker only runs in release builds, so you can test debug builds without it. The last line of getLicenseChecker decides when it runs:

You want the checker…	Last line
Only in release builds (default)	return if (BuildConfig.DEBUG) null else super.getLicenseChecker()
Never	return null
Always, also in debug builds	return super.getLicenseChecker()

Keep destroyChecker() as the first line of getLicenseChecker.

Note

If you see “Unresolved reference: BuildConfig” in this file, your package name isn’t set up correctly. See Set Package Name.