Chris, Thanks for the input and suggestions. I'm trying to get enough understanding on this so I can start writing some blog entries on "mono for CF developers" and "sharing code across platforms, including mono". Any little bit of info or "this is what we've done" bit helps.
-Chris From: monodroid-boun...@lists.ximian.com [mailto:monodroid-boun...@lists.ximian.com] On Behalf Of Tossing, Chris Sent: Friday, March 30, 2012 9:47 AM To: Discussions related to Mono for Android Subject: Re: [mono-android] Services, Activities, Contexts and separation of concerns Chris, I come from a similar background as yours - Windows Mobile 6.5. I have relied on your work and posts fairly heavily, so thank you. I hope I can return something back. We are actually sharing, I would estimate, about 80-90% of our code across Windows Mobile 6.5, Android, and iPhone using MonoTouch and Mono for Android. We are using an MVC/MVP pattern very successfully across those three platforms, able to implement new screens fairly rapidly. We have a number of classes like you describe that require a context to operate. Basically, we have implemented a way to always know what the current context is by having a base Activity class which updates the current Activity in a globally accessible place. Our Android-specific implementation of the interface in question, would simply use the current Activity as it's context for every call. I could go into more details, but that's the basic premise. I hope that helps. Thank you, Chris Tossing Software Engineer G4S Technology Software Solutions LLC Direct Dial: +1 (781) 457-0779 Cell: +1 (847) 942-0359 chris.toss...@usa.g4s.com<mailto:chris.toss...@usa.g4s.com> www.1f.com<http://www.1f.com/> 21 North Avenue, Burlington, Massachusetts 01803 USA P Please consider the environment before printing this email From: monodroid-boun...@lists.ximian.com [mailto:monodroid-boun...@lists.ximian.com] On Behalf Of Chris Tacke Sent: Thursday, March 29, 2012 10:57 AM To: Discussions related to Mono for Android Subject: [mono-android] Services, Activities, Contexts and separation of concerns I'm having trouble wrapping my head around what seems to be a fairly fundamental requirement in Mono (or M4A anyway), and I'm looking for guidance. My experience in software development leads me to want to do separation of concerns and push toward patterns like MVC/MVP, but Mono seems to push back. Loads of things seem to require a Context or an Activity, which makes it challenging to separate out single services and work units. As a concrete example, I'm trying to create a Presenter that provides location information. I don't want to just use the LocationManager as-is because architecturally it's not right (in my mind anyway), plus I often will be getting location data from elsewhere. So in my LocationPresenter, I want to encapsulate a LocationManager. To do that I need to call GetSystemService on a Context. So here's my first need - a Context. For now I usd IoC and just injected the MainLauncher Activity as a context and use that. It feels a bit dirty but works. Then I said, "hey, I'd like to get location change notifications", so I implemented ILocationListener in my Presenter. Bear in mind it derives from no other classes. First, it made me implement a Handle property. That can't be good - I don't know where those come from or what it's going to be tied to. When I run the app, no surprisingly it crashes with a "Java.Lang.RuntimeException: listener==null", I assume because I don't have the infrastructure in my Presenter that the LocationManager wants. It doesn't appear to be calling for the Handle (not hitting the break point) but it's failing. Maybe I'm on the wrong thread - but RunFromUiThread is again part of an Activity , which I'm not. All examples have the listener as an Activity, which I assume will work, but it's not what I want. So the question here, I guess, is how are other people handling this? Should I just resign myself to everything needing to be an Activity? I hit similar issues when I was doing mapping. I hit similar issue when I want to have a "common object resource" class. Does M4A require me to alter some of my fundamental architecture thinking, or am I just missing something? -Chris ________________________________ The details of this company are as follows: G4S Technology Limited, Registered Office: Challenge House, International Drive, Tewkesbury, Gloucestershire GL20 8UQ, Registered in England No. 2382338. This communication may contain information which is confidential, personal and/or privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s), please note that any distribution, forwarding, copying or use of this communication or the information in it is strictly prohibited. Any personal views expressed in this e-mail are those of the individual sender and the company does not endorse or accept responsibility for them. Prior to taking any action based upon this e-mail message, you should seek appropriate confirmation of its authenticity. This e-mail has been scanned for all viruses by MessageLabs.
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