[android-developers] Re: Reusable Android library packaging: interest?

2010-04-12 Thread friedger

 We are very aware of the need for this use case (in-house sharing of
 code/resources), and are working on something.
That is good to hear!

OpenIntents might be a good place to host a repository of public
widgets, as there is already a list of open intents and reusable
libraries.
I support Mark's effort!

Friedger
---
www.openintents.org
www.droidcon.com

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Re: [android-developers] Re: Reusable Android library packaging: interest?

2010-04-09 Thread Xavier Ducrohet
On Mon, Mar 29, 2010 at 9:21 AM, westmeadboy westmead...@yahoo.co.uk wrote:
 I'm sure this would be very useful to some/many.

 But, personally, I'm specifically interested in sharing in-house
 resources-based jars between my own apps.

 Currently I'm resorting to a prehistoric copy-paste approach!

We are very aware of the need for this use case (in-house sharing of
code/resources), and are working on something.

Xav
-- 
Xavier Ducrohet
Android SDK Tech Lead
Google Inc.

Please do not send me questions directly. Thanks!

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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-05 Thread Bob Kerns
I've been holding off on replying to this only because I haven't fully
collected my thoughts. I hope to write up my recommendations for build
approaches, especially for free/paid apps, before really wrapping my
mind around it.

But since that's taking me a while, I thought I should chime in, yes,
I'm interested. Quite.

But one thought is that making this be a command may not be the best
approach for integration into build systems. I'm thinking that
packaging it as an ant macro in an antlib may be a better approach,
with the underlying technology being a .zip file with the various
pieces.

Then, if you feel the need for a command, you could create an ant
script, and simple shell scripts to invoke it.

This would leverage Ant's facilities (.zip files, file operations,
xslt to update the manifest, etc), give you platform independence, and
not require any software installation other than the antlib, since
people already need ant (even if they don't know it).

It's not that I'm a huge fan of ant. But it's adequate, and already a
part of the tool mix. And I see the primary endpoint being good
integration with building, and ant is a key part of that for most of
us.

It looks like this should mostly integrate cleanly with the build
approach I'm about to blog about. My approach, for production builds,
produces pristine clones of your hierarchy, so injecting into this
won't interfere with revision control systems or builds. However,
there are issues to work out about integration with Eclipse. Or
alternatively, we could inject into a project, and then check it in.
The problem here is that managing upgrading to a new revision of a
library becomes more problematic, as you need to consider unwinding
changes to the manifest, removing files no longer needed, etc.

Overall, I think it's cleaner to consider injection to be a build
step, rather than a project configuration step.

You also need to consider how to avoid and/or handle file name
conflicts.

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Re: [android-developers] Re: Reusable Android library packaging: interest?

2010-04-05 Thread Mark Murphy
 But one thought is that making this be a command may not be the best
 approach for integration into build systems. I'm thinking that
 packaging it as an ant macro in an antlib may be a better approach,
 with the underlying technology being a .zip file with the various
 pieces.

 Then, if you feel the need for a command, you could create an ant
 script, and simple shell scripts to invoke it.

You assume I have the patience for Java. I put up with it for Android
development, but that's about as far as I want to, at least for the
initial versions.

Part of the goal is to fully document all of the file structures and
whatnot such that if somebody else wants to create a native Ant task, or a
Rake task for use with JRuby, or whatever, they have all the info they
need. And I will be happy to help with testing and coordination and all
that.

Tactically, I will be demonstrating Ant tasks that call out to the
command, much like they call out to javac, jar, aapt, etc. today.

And I'm not saying I'd never write an Ant task or Maven thingamajig or
whatever myself someday, just that I'm not starting there.

 Overall, I think it's cleaner to consider injection to be a build
 step, rather than a project configuration step.

I am up for trying to support both modes. This is the sort of thing --
like commands vs. Ant vs. Maven -- that really embodies the expression
beauty lies in the eye of the beholder. Where possible, on those sorts
of things, I'd like to let the developer make the call.

 You also need to consider how to avoid and/or handle file name
 conflicts.

And resource ID conflicts. And dealing with the fact that you can't use
R.layout with those resources. And a whole host of other annoyances that,
individually, aren't particularly huge, but collectively represent a
significant amount of sand in the gears.

Thanks for the input!

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com
Android App Developer Books: http://commonsware.com/books.html


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Re: [android-developers] Re: Reusable Android library packaging: interest?

2010-04-05 Thread Mark Murphy
 Anyway, if you choose to go the parcel shell route, don't forget a
 parcel upgrade command. Personally, If I cannot upgrade easily to a
 new version of a library I wouldn't use it.

Yup, it's in there.

Thanks for the input!

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com
Android App Developer Books: http://commonsware.com/books.html


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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-05 Thread Bob Kerns
I didn't suggest writing any Java code. I didn't suggest writing any
ant tasks in Java.

I said to create an antlib (though I should have said library of ant
definitions to be used with include/), which is entirely in XML.
That's part of why I suggested this approach, as it would avoid the
need for coding the commands in some language or other, and leverage
the coding already done for the EXISTING ant tasks.

I've written Ant tasks in Java. I see no need for it in this project;
I think we're on the same page there.

Anyway, my point was primarily implementation -- I think the
implementation will work out more simply and portably if the bulk of
it is done with existing ant tasks.

There might be need for some code to handle things like resource
conflicts. I suspect this could be handled well with XSLT scripts
called from ant, though if it gets complex, I'd recommend against
doing the complex logic parts in XSLT. XSLT makes manipulating XML
very easy, but general computation very hard! But you could produce an
XML file of mappings and drive the XSLT using that.

Now of course, you're about to tell me you have no patience for ant,
either! But you've got to have patience for SOMETHING...

On Apr 5, 4:45 am, Mark Murphy mmur...@commonsware.com wrote:
  But one thought is that making this be a command may not be the best
  approach for integration into build systems. I'm thinking that
  packaging it as an ant macro in an antlib may be a better approach,
  with the underlying technology being a .zip file with the various
  pieces.

  Then, if you feel the need for a command, you could create an ant
  script, and simple shell scripts to invoke it.

 You assume I have the patience for Java. I put up with it for Android
 development, but that's about as far as I want to, at least for the
 initial versions.

 Part of the goal is to fully document all of the file structures and
 whatnot such that if somebody else wants to create a native Ant task, or a
 Rake task for use with JRuby, or whatever, they have all the info they
 need. And I will be happy to help with testing and coordination and all
 that.

 Tactically, I will be demonstrating Ant tasks that call out to the
 command, much like they call out to javac, jar, aapt, etc. today.

 And I'm not saying I'd never write an Ant task or Maven thingamajig or
 whatever myself someday, just that I'm not starting there.

  Overall, I think it's cleaner to consider injection to be a build
  step, rather than a project configuration step.

 I am up for trying to support both modes. This is the sort of thing --
 like commands vs. Ant vs. Maven -- that really embodies the expression
 beauty lies in the eye of the beholder. Where possible, on those sorts
 of things, I'd like to let the developer make the call.

  You also need to consider how to avoid and/or handle file name
  conflicts.

 And resource ID conflicts. And dealing with the fact that you can't use
 R.layout with those resources. And a whole host of other annoyances that,
 individually, aren't particularly huge, but collectively represent a
 significant amount of sand in the gears.

 Thanks for the input!

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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-04 Thread Manfred Moser
I like the idea and as far as I know this is already possible to some
extend by using the Maven Android Plugin. However this is really a
suboptimal way in terms of component reuse on the device. Ideally it
would even go further and get to a stage where a app could declare a
dependency to a widget, library, intent or whatever and some central
repository would be providing it for download.

This would be similar to how e.g maven treats dependencies and
downloads them on the fly when needed or even closer to Android how
Linux package management systems like apt or rpm handle dependencies.
The only problem with this approach is that it requires a strong open
source  community supporting the distribtution mechanism and at thist
age I have my doubts this could be achieved on Android. Would be great
though!

manfred

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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-04 Thread lordjoe

I am interested - I have the same issues even sharing with my own
libraries - In some ways the an approach might be to simply import
both the code and the resources into the project if that were possible
- The biggest issue I run across is resources which don't seem to get
imported properly when I build my projects as two separate eclipse
projects or  two  IntelliJ modules , the common widgets and the
project specific code.

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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-04 Thread Pieter
Hello Mark,

You are absolutely right: support for reusable components other than
pure Java code (and Java resources) is sorely missed. I personally
think Google should step up and add this kind of support to the
Android eclipse plugin.

In my opinion, the problem of lack of tool support is minor when
batch packaging. Using ant it is easy to copy the content of third
party libraries. Of course a lack of standards does mean that no
viable marketplace for this kind of reusable Android components can
emerge. I believe the real problem lies when developing in-house
libraries for multiple applications.

As maybe 98% or more of the developers use eclipse (just
guestimating), eclipse support for reusable (in-house) components is a
must for getting this concept off the ground (imho). When developing
your own components is easy (just being able add the library Android
project as a dependency to your application project, and not having to
worry about resources etc.), a need to package and distribute library
projects for external use will surely emerge. Ant can actually fill in
most of this need already, although a standardised format and
automatic dependency resolving (maven?) will surely help.

Anyway, if you choose to go the parcel shell route, don't forget a
parcel upgrade command. Personally, If I cannot upgrade easily to a
new version of a library I wouldn't use it.

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[android-developers] Re: Reusable Android library packaging: interest?

2010-04-01 Thread Andrew Perepelytsya
Mark,

I perfectly understand where you are coming from and support the
motion. The 'parcel' shell would be fine, I can see how it will be
welcome amongst Java devs (e.g. Grails does the same). Something I
would like to get more details on is the storage mechanism of parcels
on a local machine (maven repo has an advantage here, but of course,
not everyone is using maven). If it can be made not too prescriptive
regarding the project structure, it will have more success.

Your reusable components http://commonsware.com/cwac are an ideal
testbed for the concept, would love to see what you got already.

Thanks,
Andrew

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[android-developers] Re: Reusable Android library packaging: interest?

2010-03-29 Thread GodsMoon
To be honest, I would prefer to be able to specify package
dependencies, much like linux distros do. That way I wouldn't have to
bloat my app with source from other libs and I would make a non open
source app a dependency even.
However, I don't think we can do that without Google getting involved.
I haven't yet tried to bundle a any libs in my APK's but I am planning
on doing that soon.
You make it sound like it is quite a hassle to do so. I'm always
interesting in things that make my life easier.

David Shellabarger
http://www.goldfishview.com

On Mar 29, 10:19 am, Mark Murphy mmur...@commonsware.com wrote:
 Creating Android JARs is fairly easy...so long as all you want to do is
 ship Java code. If your Java code needs resources or assets, or offers
 up activities or services, then you have to ship a JAR plus a whole
 bunch of other stuff. And the person reusing your JAR would need to know
 about all that other stuff, find it, download it into the right spots,
 etc. The only way that is somewhat convenient for the developers is to
 package this stuff into separate APKs...which is inconvenient for the users.

 IMHO, that's one of the reasons why we don't have a robust collection of
 third-party widgets or other libraries. There are few recipes for
 creating such things, no standards or conventions for how to consume
 them, and no home for them to live. At least, I am not aware of much in
 this area -- please correct me if I've missed something.

 I've been working on a solution for all of that, or as good of a
 solution as I can create given some of the peculiarities of Android's
 build tools. Before I invest much more time, though, I need to know if
 anyone really cares.

 

 Suppose you found out about...say...a calendar widget you wanted for
 integration in your app. You might have found it from a Web-based
 catalog of components, or from a search engine query, or a StackOverflow
 answer, or whatever.

 To download that calendar widget, you would run:

 parcel install name

 where name is the unique identifier for this widget. That would
 download the widget to your development machine, plus download any
 dependent libraries.

 To use that widget in one of your Android projects, you would run:

 parcel inject name

 from the project base directory. This would:

 -- copy the JAR file(s) into libs/
 -- copy the resource(s) into res/
 -- merge in key elements (e.g., activities) into AndroidManifest.xml
 -- copy documentation and other stuff into parcels/name
 -- do all of the above for all dependencies as well

 If you write a calendar widget and want to make a parcel for others to
 reuse, there would be:

 parcel package name ...

 where you specify the parcel to create and all the stuff that should go
 in it (JARs, resources, source code, documentation, etc.). You could
 wrap this up in an Ant task or Maven plugin or Eclipse, um, thingy, if
 you wished to integrate this as part of a build process.

 There's more to it, but this should give you the feel for what I have in
 mind. It is modeled loosely after RubyGems and Rails vendor plugins, two
 of the more successful examples of this pattern in use today.

 

 If this is something you would like to see, please reply to this
 message, or tweet me (@commonsguy), to let me know of your interest. If
 I release this, I'll be committing a fair chunk of time to helping to
 maintain it, and I don't want to make that commitment until I have a
 sense that enough people will care.

 I am, of course, certainly open to other ideas, suggestions, Googly
 input, etc. :-)

 Thanks in advance!

 --
 Mark Murphy (a Commons 
 Guy)http://commonsware.com|http://twitter.com/commonsguy

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[android-developers] Re: Reusable Android library packaging: interest?

2010-03-29 Thread westmeadboy
I'm sure this would be very useful to some/many.

But, personally, I'm specifically interested in sharing in-house
resources-based jars between my own apps.

Currently I'm resorting to a prehistoric copy-paste approach!

On Mar 29, 4:19 pm, Mark Murphy mmur...@commonsware.com wrote:
 Creating Android JARs is fairly easy...so long as all you want to do is
 ship Java code. If your Java code needs resources or assets, or offers
 up activities or services, then you have to ship a JAR plus a whole
 bunch of other stuff. And the person reusing your JAR would need to know
 about all that other stuff, find it, download it into the right spots,
 etc. The only way that is somewhat convenient for the developers is to
 package this stuff into separate APKs...which is inconvenient for the users.

 IMHO, that's one of the reasons why we don't have a robust collection of
 third-party widgets or other libraries. There are few recipes for
 creating such things, no standards or conventions for how to consume
 them, and no home for them to live. At least, I am not aware of much in
 this area -- please correct me if I've missed something.

 I've been working on a solution for all of that, or as good of a
 solution as I can create given some of the peculiarities of Android's
 build tools. Before I invest much more time, though, I need to know if
 anyone really cares.

 

 Suppose you found out about...say...a calendar widget you wanted for
 integration in your app. You might have found it from a Web-based
 catalog of components, or from a search engine query, or a StackOverflow
 answer, or whatever.

 To download that calendar widget, you would run:

 parcel install name

 where name is the unique identifier for this widget. That would
 download the widget to your development machine, plus download any
 dependent libraries.

 To use that widget in one of your Android projects, you would run:

 parcel inject name

 from the project base directory. This would:

 -- copy the JAR file(s) into libs/
 -- copy the resource(s) into res/
 -- merge in key elements (e.g., activities) into AndroidManifest.xml
 -- copy documentation and other stuff into parcels/name
 -- do all of the above for all dependencies as well

 If you write a calendar widget and want to make a parcel for others to
 reuse, there would be:

 parcel package name ...

 where you specify the parcel to create and all the stuff that should go
 in it (JARs, resources, source code, documentation, etc.). You could
 wrap this up in an Ant task or Maven plugin or Eclipse, um, thingy, if
 you wished to integrate this as part of a build process.

 There's more to it, but this should give you the feel for what I have in
 mind. It is modeled loosely after RubyGems and Rails vendor plugins, two
 of the more successful examples of this pattern in use today.

 

 If this is something you would like to see, please reply to this
 message, or tweet me (@commonsguy), to let me know of your interest. If
 I release this, I'll be committing a fair chunk of time to helping to
 maintain it, and I don't want to make that commitment until I have a
 sense that enough people will care.

 I am, of course, certainly open to other ideas, suggestions, Googly
 input, etc. :-)

 Thanks in advance!

 --
 Mark Murphy (a Commons 
 Guy)http://commonsware.com|http://twitter.com/commonsguy

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[android-developers] Re: Reusable Android library packaging: interest?

2010-03-29 Thread Gaunt Face
This is a pretty interesting idea.

It's hard to think of where this would be useful, but I can imagine
some people finding a use for it, but you could spend a great deal of
time trying to develop and maintain this and it would have slow take-
up, only after some fairly common parcels start to get used by a
majority will it gain any ground  in the community.

I guess the thing for me is if I wanted a library or tool for (i.e. a
calendar widget) I would probably want to have the resources and
insert them myself, that way I can customise it (make it look unique
to my app, users don't want 10x the same looking widget with different
text), use my own naming conventions for classes and activities (in
source and manifest.xml) etc this way I will be aware of what's
happened and where.

Would you have any idea of how to keep these parcel's up to date?

It's a great idea, but not sure how successful it would be, and
whether it would be worth the amount of time you might spend on it. I
kind of feel like this is a lower version of an open intent where a
user could install a calendar widget and then other apps can hook into
the application to display information through that widget. While it
might be a pain to the user initially, I think most would see it as an
extra and therefore have to make a little extra effort to go download
the necessary applications, which I don't think many would mind.

Have a look a twicca, they have their main application and then a set
of plug-in applications which give some extra functionality to their
main app.

Keep us posted on what you decide to do.

Cheers,
Matt

On Mar 29, 3:19 pm, Mark Murphy mmur...@commonsware.com wrote:
 Creating Android JARs is fairly easy...so long as all you want to do is
 ship Java code. If your Java code needs resources or assets, or offers
 up activities or services, then you have to ship a JAR plus a whole
 bunch of other stuff. And the person reusing your JAR would need to know
 about all that other stuff, find it, download it into the right spots,
 etc. The only way that is somewhat convenient for the developers is to
 package this stuff into separate APKs...which is inconvenient for the users.

 IMHO, that's one of the reasons why we don't have a robust collection of
 third-party widgets or other libraries. There are few recipes for
 creating such things, no standards or conventions for how to consume
 them, and no home for them to live. At least, I am not aware of much in
 this area -- please correct me if I've missed something.

 I've been working on a solution for all of that, or as good of a
 solution as I can create given some of the peculiarities of Android's
 build tools. Before I invest much more time, though, I need to know if
 anyone really cares.

 

 Suppose you found out about...say...a calendar widget you wanted for
 integration in your app. You might have found it from a Web-based
 catalog of components, or from a search engine query, or a StackOverflow
 answer, or whatever.

 To download that calendar widget, you would run:

 parcel install name

 where name is the unique identifier for this widget. That would
 download the widget to your development machine, plus download any
 dependent libraries.

 To use that widget in one of your Android projects, you would run:

 parcel inject name

 from the project base directory. This would:

 -- copy the JAR file(s) into libs/
 -- copy the resource(s) into res/
 -- merge in key elements (e.g., activities) into AndroidManifest.xml
 -- copy documentation and other stuff into parcels/name
 -- do all of the above for all dependencies as well

 If you write a calendar widget and want to make a parcel for others to
 reuse, there would be:

 parcel package name ...

 where you specify the parcel to create and all the stuff that should go
 in it (JARs, resources, source code, documentation, etc.). You could
 wrap this up in an Ant task or Maven plugin or Eclipse, um, thingy, if
 you wished to integrate this as part of a build process.

 There's more to it, but this should give you the feel for what I have in
 mind. It is modeled loosely after RubyGems and Rails vendor plugins, two
 of the more successful examples of this pattern in use today.

 

 If this is something you would like to see, please reply to this
 message, or tweet me (@commonsguy), to let me know of your interest. If
 I release this, I'll be committing a fair chunk of time to helping to
 maintain it, and I don't want to make that commitment until I have a
 sense that enough people will care.

 I am, of course, certainly open to other ideas, suggestions, Googly
 input, etc. :-)

 Thanks in advance!

 --
 Mark Murphy (a Commons 
 Guy)http://commonsware.com|http://twitter.com/commonsguy

-- 
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Re: [android-developers] Re: Reusable Android library packaging: interest?

2010-03-29 Thread Mark Murphy
Gaunt Face wrote:
 It's hard to think of where this would be useful, but I can imagine
 some people finding a use for it, but you could spend a great deal of
 time trying to develop and maintain this and it would have slow take-
 up, only after some fairly common parcels start to get used by a
 majority will it gain any ground  in the community.

Indubitably. That's why I'm trying to gauge interest.

 I guess the thing for me is if I wanted a library or tool for (i.e. a
 calendar widget) I would probably want to have the resources and
 insert them myself, that way I can customise it (make it look unique
 to my app, users don't want 10x the same looking widget with different
 text), use my own naming conventions for classes and activities (in
 source and manifest.xml) etc this way I will be aware of what's
 happened and where.

That's awful for maintainability. What happens when the next version of
the widget is released by it's author?

Your approach also assumes open source. If you are not in position to
recompile the widget, your ability to change things (e.g., naming
conventions) is more limited. Part of what would need to accompany the
parcel system is guidance to those creating reusable widgets for how to
enable knobs and levers for reusers to turn and, um, leverage.

 Would you have any idea of how to keep these parcel's up to date?

If you tinker with the innards, the way you propose, you're on your own.
This is no different than tinkering with the innards of a CPAN module in
Perl, a Ruby gem, a Rails vendor plugin, a Linux package, a Java JAR via
a decompiler, etc.

A parcel can be extracted (opposite of injecting) from a project.
Updating is extracting the old and injecting the new. The Android build
system makes this a lot more icky than, say, updating a Ruby gem, but
much of the ick can be confined to the parcel engine itself.

 Keep us posted on what you decide to do.

Will do, and thanks for the feedback!

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy

_The Busy Coder's Guide to *Advanced* Android Development_
Version 1.4 Available!

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[android-developers] Re: Reusable Android library packaging: interest?

2010-03-29 Thread Sebastian
I'd be very interested, and willing to lend a hand. I've been
collecting my own library of tricks and widgets and even sharing
within my own apps it's cumbersome.



On Mar 29, 1:41 pm, Mark Murphy mmur...@commonsware.com wrote:
 Gaunt Face wrote:
  It's hard to think of where this would be useful, but I can imagine
  some people finding a use for it, but you could spend a great deal of
  time trying to develop and maintain this and it would have slow take-
  up, only after some fairly common parcels start to get used by a
  majority will it gain any ground  in the community.

 Indubitably. That's why I'm trying to gauge interest.

  I guess the thing for me is if I wanted a library or tool for (i.e. a
  calendar widget) I would probably want to have the resources and
  insert them myself, that way I can customise it (make it look unique
  to my app, users don't want 10x the same looking widget with different
  text), use my own naming conventions for classes and activities (in
  source and manifest.xml) etc this way I will be aware of what's
  happened and where.

 That's awful for maintainability. What happens when the next version of
 the widget is released by it's author?

 Your approach also assumes open source. If you are not in position to
 recompile the widget, your ability to change things (e.g., naming
 conventions) is more limited. Part of what would need to accompany the
 parcel system is guidance to those creating reusable widgets for how to
 enable knobs and levers for reusers to turn and, um, leverage.

  Would you have any idea of how to keep these parcel's up to date?

 If you tinker with the innards, the way you propose, you're on your own.
 This is no different than tinkering with the innards of a CPAN module in
 Perl, a Ruby gem, a Rails vendor plugin, a Linux package, a Java JAR via
 a decompiler, etc.

 A parcel can be extracted (opposite of injecting) from a project.
 Updating is extracting the old and injecting the new. The Android build
 system makes this a lot more icky than, say, updating a Ruby gem, but
 much of the ick can be confined to the parcel engine itself.

  Keep us posted on what you decide to do.

 Will do, and thanks for the feedback!

 --
 Mark Murphy (a Commons 
 Guy)http://commonsware.com|http://twitter.com/commonsguy

 _The Busy Coder's Guide to *Advanced* Android Development_
 Version 1.4 Available!

-- 
You received this message because you are subscribed to the Google
Groups Android Developers group.
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