Hi Heinrich, > > thank you for your great app. You're welcome! > > I started a stub in the GLPK wikibook: > https://en.wikibooks.org/wiki/GLPK/Android_app > Maybe you want to add some more text and a screen shot. Will take a look soon. > > Please, add the text of the GPL v3 license to make it clear how your > coding can be used. Where would you recommend it be added? On the 'help' tab of the app, I discuss the license and allow the user to view the full text of the license. Are you referring to the source code itself? I think most of my own java files have included the boiler plate GPL language. > > I recognized that you created a wrapper with SWIG. But I could not find > the SWIG file with which you generated my_wrap.c and glpk_android_wrap.c > in the github repository. Why did you add both C-files? Which one is used? My guess is that my_wrap.c is an orphan file from my initial tries to use SWIG. I'll get rid of it and rebuild to make sure that's the case. I did this work several months ago and am not a SWIG expert. Is it the .i file you are referring to? I looked at my shell history to remember what I did and I saw this:
309 swig -java -package com.littlepancake.glpk.jni glpk_android.i 310 ls *.java 311 cp *.java ~/Development/glpk_workspace/GLPKLibrary/src/com/littlepancake/glpk/jni/ So I guess the file you'd need to reproduce what I did is the glpk_android.i that I wrote. Does that sound correct? > > In GLPK for Java (http://glpk-java.sf.net) I added some coding to catch > errors which may occur while calling the native library. I suggest to > add such error handling also to the app. I think ultimately, it would be a great step forward to rely on a project such as yours for the jni wrappers. But when I first looked at that, I was a bit overwhelmed by the code. I found it easier to build up from the SWIG tutorials. I'd be happy to find a way to leverage your work on that part of the software. > > Is there something that should be changed in GLPK for Java to make it > more suitable for building your Android app? I don't think so. However, I do know that if certain functions are called the app will crash. I didn't dig to far in since the basic LP solving was working. As users start to play with the library on Android, I hope they provide reports of how it is working and not working for them. > > Allowing to use the GMPL language instead of the LP format in the app > would be logical next step. In GLPK for Java you will find file > examples/java/GmplSwing.java which could serve as a starting point. I'll take a look. It would be relatively easy to add a tab demonstrating any other format (assuming the library calls don't crash anything!). > > Adding some example files and a GMPL cheatsheet would also be helpful. Happy to take pull requests to the github repo! Thanks,Joey > > Best regards > > Heinrich Schuchardt > > On 16.11.2014 20:25, Joey Rios wrote: > > Hi GLPKers, > > > > Just wanted to announce a new app and open source project I've put out > > there. I've gotten GLPK to compile and run within an Android app. I > > did this a few months ago and it just sort of languished on my local > > machine. I've cleaned it up and posted all the source to github and > > placed the app on the Google Play store. > > > > https://play.google.com/store/apps/details?id=com.littlepancake.glpk > > > > https://github.com/alotau/GLPKAndroid/tree/master > > > > I'd be happy if Android-inclined GLPK folks tried out either just the > > app or the app and the source code. Any feedback on the app or the > > source would be appreciated. Even if you just download the app (it's > > free) and click around, I'd appreciate a review on the Play store to > > increase the project's visibility. > > > > The app isn't too exciting, but it should demonstrate that GLPK is doing > > something. You can enter a model in Mathprog format and solve it. > > There isn't too much feedback from the app if there is a problem with > > the model, but there should be enough there for people who are familiar > > with Mathprog and GLPK. > > > > Anyway, that's it. > > > > Thanks, > > Joey > >
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