Android Apps Can Now Block Sideloading, Force Downloads Through Google Play

Android Authority's Mishaal Rahman reports: There are many reasons why you may want to sideload apps on your Android phone, but there are also good reasons why developers would want to block sideloading. A sideloaded app won't contribute to the developer's Play Store metrics, for one, but it also prevents the developer from curating which devices can use their app. Improperly sideloaded apps can also crash due to missing assets or code, or they might be missing certain features because you installed the wrong version for your device. Whatever the reason may be, developers who want to stop you from sideloading their apps now have an easier way to do so thanks to the Play Integrity API.

The Google Play Integrity API is an interface that helps developers 'check that interactions and server requests are coming from [their] genuine app binary running on a genuine Android device.' It looks for evidence that the app has been tampered with, that the app is running in an 'untrustworthy' software environment, that the device has Google Play Protect enabled, and more. If you've heard of or dealt with SafetyNet Attestation before on a rooted phone, then you're probably already familiar with Play Integrity, even if not by that name. Play Integrity is the successor to SafetyNet Attestation, only it comes with even more features for developers.

As is the case with SafetyNet Attestation, developers call the Play Integrity API at any point in their app, receive what's called an integrity verdict, and then decide what they want to do from there. Some apps call the Play Integrity API when they launch and block access entirely depending on what the verdict is, while others only call the API when you're about to perform a sensitive action, so they can warn you that you shouldn't proceed. The Play Integrity API makes it easy for apps to offload the determination of whether the device and its software environment are 'genuine,' and with the latest update to the API, apps can now easily determine whether the person who installed them is 'genuine' as well. 'As Google continues to bolster Play Integrity's detection mechanisms and add new features, it's going to become harder and harder for power users to justify rooting Android,' concludes Rahman. 'At the same time, regular users will be better protected from potentially risky and fraudulent interactions, so it's clear that Play Integrity will continue to be adopted by more and more apps.'

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