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Is it possible to backup J2ME data to a PC?

Posted on 2007-03-24
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Hi, I'd like to write a Tasks (ToDo) application that will run on any Java enabled phone. I've seen such apps, but there's no way to back up your data. Then you'd be better off using pen and paper :-)

Is there a way of to write a J2ME app that will allow you to backup to / sync with a PC?

Either via USB-cable or bluetoth. Or else?
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Question by:davidsperling
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LVL 30

Expert Comment

by:Mayank S
ID: 18785729
You can sync up data by sending it over sockets to a program runing and listening on the PC, which can put it into files on the desktop. Otherwise the J2ME app itself can write to files on the PDA. For synching operations without using such code, you might have to use something specific to each platform depending on the configuration/ profile of J2ME like Java Conduit Development Kit for Palm/ CLDC:

http://www.ociweb.com/jnb/archive/jnbJan2001.html
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by:davidsperling
ID: 18788948
That sounds great! Can you show me some example of socket programming? Is it included in Netbeans. I'm familiar with  the term, but never used it.
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by:davidsperling
ID: 18788966
Do you seriously mean that you can write a PC "listener" that would work with ANY java phone? Sounds almost too good to be true... why hasn't anybody done that?
(ok someone probably has ;-)
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by:davidsperling
ID: 18789024
And since the listener is written in Java it will also work on Mac & Linux, right? :-)
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Expert Comment

by:Mayank S
ID: 18789036
Yes but that assumes you would be transferring data over WiFi.

Sample server socket listener would be like what is posted in my comment here:

http://www.experts-exchange.com/Programming/Languages/Java/Q_21757720.html#16084277
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Author Comment

by:davidsperling
ID: 18789069
Ok, so it's not possible to sync by usb or bluetoth like nokia's or samsung's pc-studios?
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Expert Comment

by:Mayank S
ID: 18789078
Oh yes it is possible to sync up over USB too :) I meant its not over GSM/ CDMA....
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Author Comment

by:davidsperling
ID: 18792050
Do you know of any mobile java apps with that capability?
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Expert Comment

by:Mayank S
ID: 18796771
GSM or USB?
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Author Comment

by:davidsperling
ID: 18798504
USB! I want the solution to be independent of any service provider.
(Of course gsm examples'd be nice too)
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Accepted Solution

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Mayank S earned 500 total points
ID: 18802833
I've synched up data using TCP/ IP over USB b/w a PDA and a desktop - could write applications to communicate between them through sockets using .NET compact framework, so I guess in J2ME it would be the same.
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Expert Comment

by:Mayank S
ID: 18840870
Any reason for the C grade? You can ask for more clarification if you want. We all post here for free, in our leisure time.
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LVL 4

Author Comment

by:davidsperling
ID: 18841771
Oh, sorry. Didn't know that c was bad. It said average... I'm greatful for the help! Reason for no a - I don't think the question is 100% answered. You say it's possible with a PDA, which I do not doubt. The question was wether it's possible with any java enabled non-smart phone (with usb of course). Lesson learned, c is an insult... Shame on me :-)
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