I am trying to do a list of Android task killers that are installed by default on the operating system. The problem is that Android is modified by the phone\'s manufacturer and
Unfortunately, there doesn't seem to be any solution for it. But what you can do is to identify such device manufacturers with "Battery Saver" apps or "Background Killer" apps. And display notifications to the users owning these smartphones (along with intstructions) to enable your app to process in the background manually.
A small tip for AlarmManager: you would have to reset all the alarms once again after the app is excluded from the blocked list. So, far I have identified these manufacturers: Samsung, Asus, Xiaomi, Huawei.
Here is how to exclude the app from being disabled: https://stackoverflow.com/a/40992179/5129047