List Of Private / Hidden / System Apis

In this post I've read about all that stuff about private apis which are annotated with @hide. The presence of hidden apis is not as well-known as the "all apps are equal"-mantra, but i think there should be more information on it. As long as i belivied in the mantra, i had dialogues like that: boss: can you do xyz on android? Me: yes, of course, there are apps on my phone which do it, so we can do it, too! Boss: cool, go ahead and code that stuff. Customers will love it!Two days later. Me: hey boss, i just found out i need some private api for that. Forget all your business plans.

I totally agree with those two reasons for private apis: 1. Some features would be too dangerous from a security perspective 2. Some apis were not ready to ship when 1. 0 came out, so they should be published later

The post i mentioned above is about two private apis:
* Installing apps without any intervention by the user
* Calling emergency phone numbers like 911 i'm sure there are more private apis, i think those are good examples:
* Everything related to bluetooth
* Reading contancts from a sim card / writing them there but im afraid there may be many more which i'm not aware of.could we create an exhaustive list of them? I think no such list exists yet. For each api/feature it would be nice to know: 
* Why is it private?
* Will it ever be public?
* If yes, are there any schedules when this might come true, in terms of release numbers or in terms of a date?

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