In search of a way to upload an image, I added a lot of external JARs following this simple explanation:using-multipartentity-in-android-applications
But when I try co compile the code I'm getting an error:
[2012-12-14 11:37:55 - Dex Loader] Unable to execute dex: Multiple dex files define Lorg/apache/http/ConnectionClosedException;
I have never used external libraries before. Can someone tell me how to fix that?
The same class/classes may be defined in multiple libraries. That's why you are getting this error. You need to check which classes are overlapping and resolve the issue by re-organizing or removing some external libraries.
It might also be an eclipse issue. Try cleaning your project.
See the following threads:
Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;
Unable to execute dex: Multiple dex files define
Error when building apk - "Multiple dex files define Lcom/google/ads/Ad"
If you type
org.apache.http.auth.AUTH auth;
somewhere in your code, then select the AUTH part, right click it and hit Declarations > Workspace, you'll where this class is declared. It's in android.jar, but in my project it was also in two separate versions of httpclient-4.x.x.jar (one had got added in as a dependency of another part of the project).
Removing the earlier version of httpclient-4.x.x.jar seems to have fixed this for me; you may find you have multiple libraries included in your project that declare this class (other than android.jar) and removing one or more will help too.
Right click the src and gen folders and select Build Path > Remove from Build Path. then Right Click > Build Path > Use as Source Folder
