Um no... the application would not just receive the same error code unless Google specifically set it up just for that permission, and that strategy wouldn't work for any other permissions. Think about it, the manifest specifies that the application will have access to whatever it asks for... the application would just crash when the VM/kernel denies it access to other applications data or some system permission because the user is given the ability to override it. Not having an active connection to receive an SMS is a completely unrelated and irrelevant point.
I find it really super awesome that this is downvoted. Yes, an application that expects a permission to be available, randomly not being able to access is sure to not cause problems. Not just -1 too, we really have to ram this post into the ground, no reply, just watched my karma drop like 10 points. I expected better. Keep it coming guys, teach me my lesson without actually replying!
I think there is a middle ground. Certainly, there are going to be some permissions an app can't function without (e.g. you can't have a phone dialer work that doesn't have access to the phone). On the other hand, there are permissions that are purely optional to an application (such as the afore-mentioned SMS).
It would be better to specify "required permissions" and "enhanced feature permissions". I require the phone permission to run. I can use the SMS feature to make your experience better.
I'm not saying it is a bad idea. I really like it in fact. I really don't think it will work as smoothly as (apparently everyone) seems to think. Android wasn't built to have this feature... and I'm not sure that even this middle ground could be done in a way that doesn't break many existing applications.
I disagree. Apps already need to be able to handle some of these situations (as some parent post mentioned), but you don't even have to alter any existing app as all existing permissions requests default to "required".
I don't buy the argument that "it would make testing the app too difficult." It just isn't that hard to put feature-placed guards in place. Web apps do that all the time today for JavaScript capabilities and they survive just fine. I have a lot of apps on my iPhone that I don't give location permissions to that continue to work fine as well.
I don't know the details of the underlying OS change, but I would imagine it isn't that large of a change, either (if any change at all). The system has to have the ability to check if an app has permission to perform an operation today so people can't lie about the permissions they are using. It would just do the same thing it does today.
So we are down to adding a flag to the permissions requested (required versus requested), adding a description field to the flag, and altering the presentation of the permissions at install time.
Why am I bothering replying if no one will take the time of day to explain why they're crucifying all of my comments here when I'm voicing a completely legitimate claim about denying apps that have been guaranteed permissions access to those features...
I never said it would make testing the app hard. I never said it would be hard to change Android permission model to accomodate for deniable permissions when they are needed.
I'm saying that it would break every application in existence that is expected to have guaranteed access to whatever permissions they've declared in their manifest. Android apps aren't written to handle AT ALL cases where they simply aren't given permission to do whatever, and they would surely crash as a result.
I've never been more disappointed in how comments were voted on than I am on this thread.
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edit: If you're implying that NEW apps could mark permissions as OPTIONAL and then manually request them and handle being granted them or not in code..., then I'm 100% in support. I think it's a BRILLIANT idea and I have no idea why it's not being worked on.
edit2: Surely I'm not out of line for assuming that "just return an error code and act like it's broken" was supposed to mean that users could deny permissions to existing/legacy apps that had declared the permissions in their manifest. If we've been talking this entire time about a new schema for new optional permissions in NEW applications, while still preserving legacy required permissions... well, I sure wish someone would have had the decency to point that out instead of just downvoting.
edit3: I'm almost positive he editted that comment to add that last paragraph. Or else I'm an idiot and missed it. Either way, I apparently misunderstood what he was talking about, unless that's what we've been discussing this entire time. Either way, I don't know why it didn't occur to me.
Wow, yeah. I remember reading this thread earlier and thinking "this guy (you) is the only person who has looked at the current API and is thinking about this from a practical perspective", and now I see you getting a million downvotes. That is incredibly disappointing.
No, well it depends on how they handle errors. Not all apps are stupid enough not to handle errors and crash. YOu can not make blanket statements, that is why you are being modded down. You can not speak for all apps, and it makes you sound childish to do so.
Are you telling me you'd wrap a System.out.println() in a try/catch? Even that's not absurd enough to exemplify the problem that all of you are clearly having in comprehending the magnitude of the absurdity you're spouting. The program is GUARANTEED the permission. Why would there be code to check to see if it has the permission? Do you people even understand the current Android permission model? (Such a function literally does not exist in the API.)
It's like a huge joke that I'm the punch line of. And surely, you're not recommending that a tiny fraction of apps not crashing excuses the fact that such a change would break undoubtedly near 100% of applications.
I'm just enraged at the fact that everyone is making caveats to try to make me look wrong while not a single person has actually addressed the claims I'm making. Actual Android developers in #android agree with me - not only that this would be bad for legacy apps, but that it would almost guaranteedly cause them to crash because they WOULDN'T HAVE CODE to check to see, because THAT DOESNT EXIST in the Android API because the manifest ensures they have that permission.
I don't think it would work either. Take an app that needs, say, wake locks, Internet access, and SMS access. Say further than none of them is strictly required.
Now imagine that users can deny this access on a per-permission basis. Now instead of having one app to test, you have 2 ^ 3. It's not as easy as using existing error codes, because some of these things normally don't break -- in which case it would be excusable to have fairly basic error handling. Displaying a message and allowing the user to restart the app is a fair distance (in terms of app complexity) from being required to produce an app that not only keeps running but does "the right thing" for all possible degradations of required permissions.
EDIT: I don't meant to sound pessimistic. I do really like the idea, but it seems like it would make the dev / test cycle a lot longer.
I agree it would take longer. I disagree that it would be 2^3 times longer (I don't actually believe you meant that, but it could be inferred from your comment).
The app would have to be written such that "is feature X available", not "is permission X available." Then, if I don't actually have all of the permissions I need for feature X, the whole feature isn't available, rather than trying to code for each permission.
It is really no different than having a web app continue to work as JavaScript capabilities degrade from "Chrome" to "IE 6" to "NoScript".
I meant that Google should specifically set it up so that for all permissions you get an error code (tailor to the specific permission).
In some cases, such as accessing the contacts or a directory on the phone, you could simply return an empty list. If you don't have write permissions it could tell you that there is not available space (or that the directory is read-only, etc).
I doubt it would break too many apps. I am actually more concerned that it would effectively become the way to turn of adds.
You guys are a joke. You're downvoting me and the comments here are implying that one should check to see if permissions are available and that existing applications would have code to handle such errors.
I'd love for someone to explain to me how that would work, considering that no such API exists in Android because the permissions manifest is a contract that ensures the application will have access to the resources it needs. Additionally, there is just no reason to downvote this comment as much as it has been anyway. Just ridiculously poor form for an HN comment.
I find it really super awesome that this is downvoted. Yes, an application that expects a permission to be available, randomly not being able to access is sure to not cause problems. Not just -1 too, we really have to ram this post into the ground, no reply, just watched my karma drop like 10 points. I expected better. Keep it coming guys, teach me my lesson without actually replying!