Your best shot at this would be to build a custom launcher app.

Then you have control over which apps the user sees, and how to open them. You can implement this pattern/password logic by yourself before opening the apps, and have another activity with the list of apps and checkboxes.

As a starting point, take a look at some open source android launchers like Lawnchair

i’m working on applocker application, i have listed all the apps with app icon ,app name and a checkbox to select the app ,now my requirement is when user checks the checkbox, app should be locked with a pin or pattern. I have given the usage access permission. now, how can i achieve the remaining process like monitoring apps, to show the pattern screen.