If you have a specific app you want to lock so that others can not access it, the most secure way of doing so is with biometrics. While there are options to lock apps with either a PIN or pattern, these can easily be figured out with a simple glance over your shoulder. It is much more difficult for someone to crack your fingerprint ID, unless they chop off your finger, of course.
Unfortunately, not every Android device comes with a fingerprint scanner, but what they do all come with is a camera. So today, we will show you how to fingerprint lock apps using your camera as the fingerprint scanner, no matter what Android phone or tablet you have. Every device will not be compatible with this app. As it relies on a camera with autofocus, some devices may have better success than others.
Step 1: Install fingerprint App-lock
We will be using the free application Fingerprint App-Lock (Real) to lock individual apps with biometrics. Utilizing the rear facing camera and image processing, there is no need for a dedicated fingerprint scanner any more. There is a pro version of Fingerprint App-Lock that removes ads and helps supports the developer, but the free version works well for our purposes here today. As of right now, both versions have the same features, but there might be some pro-only features in the near future.
Step 2: Setup your fingerprint
Step 3: Lock your Apps
On the main menu, select Lock Apps. Before selecting your apps, Fingerprint App-Lock will prompt you to turn on Accessibility Service, so go ahead and do so. Once it is all set, just pick the app (or apps) you want to lock. And that is all there is to it. Now when you try to open the locked app or apps, you will first be required to place your finger in front of the camera and have it scanned. The recognition is a little slower than if you were to use a dedicated fingerprint scanner, but the extra security is worth it.
Follow the above three steps and set fingerprint password without using fingerprint scanner and provide security to all your professional documents etc..