Android & jar file compatibility

How does one find out if a jar is Android compatible, meaning it does not 开发者_如何学Ccontain imports from class not contained in Android.jar?

I'm trying to build a app that uses the MySQL J connector thingy (and YES, I know about SQLite's existence, but i need the MySQL thingy to work - for remote querying) and when i add the external jar, i get:

Conversion to Dalvik format failed with error 1

I've done my Googling and found this article: http://bimbim.in/post/2010/09/24/Reason-of-Conversion-to-dalvik-format-failed-with-error-1.aspx which states, as most answers given on stackoverflow on similar problems that i should: remove all jars, clean project, fix-project-properties.

Did this, but problem persist so I'm assuming that somewhere in this jar there is a class that uses an import that android.jar's java doesn't contain... but i could be wrong, i usually am.

So... Anyone?

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It is not possible to use the MySQL connector in Android. You need to create a layer on the server that is hosting your MySQL.

I read about the reason why Android and MySQL can't directly talk to each other, but of course I can't find the post, so you'll have to do with my answer :P

Check out this tutorial out on how to use a php script to process MySQL tables to JSon:

http://www.helloandroid.com/tutorials/connecting-mysql-database

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The source code is included with the MySQL J connector download. Is it possible to use the source and build and compile java code for Android?

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Try building the project from the command line.

(assuming you have ant, and the android tool that comes with the sdk is in your path)

android update project -p . -t android-10
ant debug

(use whatever android target level your project needs, for the -t option)

If this succeeds, then your problem has something to do with eclipse, not a problem with the jar you are using. And if it fails, it will likely give you a more helpful message than "Conversion to Dalvik format failed".