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2010-02-17
, 19:31
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Posts: 2,014 |
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Joined on Sep 2009
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#2
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Originally Posted by mrojas
In a nutshell because the regular JRE is just to bloated for what they wanted. So they created their own stripped down version with a bunch of tweaks for a mobile platform environment. Was necessary essentially to get the speed they needed in the platform they had chosen
So, I was reading a bit more about Android, and I don't understand why a VM like Dalvik was considered necessary (i.e. make all aps run there instead of directly over the Linux kernel). Anyone can give some input?
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Class .. : Power Poster, Potential Coder
Humor .. : [*********] Alignment: Chaotic Evil
Patience : [***-------] Weapon(s): +2 Logic Mace
Agro ... : |*****-----] Relic(s) : G1, N900
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2010-02-17
, 19:33
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Posts: 733 |
Thanked: 991 times |
Joined on Dec 2008
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#3
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Originally Posted by Bratag
All right, I understand that, but why (in the meaning of the philosophical decision) they wanted a JRE in the first place? It restricts access to the system, introduces a bottleneck... hence wasting some of the hardware potential.
In a nutshell because the regular JRE is just to bloated for what they wanted. So they created their own stripped down version with a bunch of tweaks for a mobile platform environment. Was necessary essentially to get the speed they needed in the platform they had chosen
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2010-02-17
, 19:43
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Posts: 3,617 |
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Joined on Nov 2009
@ Cambridge, UK
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#4
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Originally Posted by mrojas
It provides an isolation layer between the hardware and software - making it easier to port to new platforms, and providing a stable API for applications.
All right, I understand that, but why (in the meaning of the philosophical decision) they wanted a JRE in the first place? It restricts access to the system, introduces a bottleneck... hence wasting some of the hardware potential.
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2010-02-17
, 19:47
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Posts: 1,213 |
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Joined on Jan 2008
@ California and Virginia
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#5
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If you have ever programed in Java, you would know that the same code theoretically works on EVERY platform with a JVM. So Android could run on ARMv5, ARM11, x86, etc... and the exact same app would work on them all. Native code would need to be recompiled for every platform.
Also, it adds an abstraction layer that means better security, sandboxing, no breaking the filesystem, etc...
There is a native development kit also, but it won't work on all hardware for the reasons above.
Also, it adds an abstraction layer that means better security, sandboxing, no breaking the filesystem, etc...
There is a native development kit also, but it won't work on all hardware for the reasons above.
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2010-02-17
, 19:52
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Posts: 733 |
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Joined on Dec 2008
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#6
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Originally Posted by Thesandlord
Aha! That's the answer I was looking for. I understand that is the same that Nokia wants to achieve with Qt, but in this case, the re-compilation would be needed (although, hopefully not rewriting).
If you have ever programed in Java, you would know that the same code theoretically works on EVERY platform with a JVM. So Android could run on ARMv5, ARM11, x86, etc... and the exact same app would work on them all. Native code would need to be recompiled for every platform.
Also, it adds an abstraction layer that means better security, sandboxing, no breaking the filesystem, etc...
There is a native development kit also, but it won't work on all hardware for the reasons above.
Thanks for your answers!
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2010-02-17
, 21:14
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Posts: 3,428 |
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Joined on Jul 2008
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#7
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Originally Posted by mrojas
Exactly.
Aha! That's the answer I was looking for. I understand that is the same that Nokia wants to achieve with Qt, but in this case, the re-compilation would be needed (although, hopefully not rewriting).
Thanks for your answers!
I always think of it like coding in Python. A PyQt4 would be portable from one to the other without a recompile.. it would "just work" as long as the device has Python and QT on it.
Same idea with Android.. it will move from android to android and "just work".. no matter what hardware.
But then of course the drawbacks of increased overhead and slower speeds arguments come into play..
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2010-02-17
, 21:17
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Posts: 992 |
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Joined on Dec 2009
@ California
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#8
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Originally Posted by Thesandlord
Not exactly - most of Java code requires some middle layer libraries to do something useful and that libraries are NOT automatically exist on target platform. And some libraries are not open source, BTW.
If you have ever programed in Java, you would know that the same code theoretically works on EVERY platform with a JVM. So Android could run on ARMv5, ARM11, x86, etc... and the exact same app would work on them all.
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2010-02-17
, 21:34
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Posts: 3,404 |
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Joined on Oct 2005
@ Germany
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#9
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Originally Posted by mrojas
Yep, the carriers love this.
It restricts access to the system
Another reason is portability across phones.
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2010-03-03
, 06:49
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Posts: 733 |
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Joined on Dec 2008
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#10
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This was very enlightening:
http://www.koushikdutta.com/2009/01/dalvik-vs-mono.html
http://www.koushikdutta.com/2009/01/dalvik-vs-mono.html
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Hola! Soy un Guía de Maemo!.
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Hola! Soy un Guía de Maemo!.
Vínculos interesantes si nos visitas por primera vez (en inglés): New members say hello , New users start here, Community subforum, Beginners' wiki page, Maemo5 101, Frequently Asked Questions (FAQ)
Si te puedo ayudar con cualquier otra cosa, sólo dilo!