I have a project that uses two independent Android libraries. Each of them contains

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Asked: May 31, 20262026-05-31T19:56:02+00:00 2026-05-31T19:56:02+00:00

I have a project that uses two independent Android libraries. Each of them contains

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I have a project that uses two independent Android libraries. Each of them contains Android support package, so that ant build fails on ‘dex’ step:

   [dx] UNEXPECTED TOP-LEVEL EXCEPTION:
   [dx] java.lang.IllegalArgumentException: already added: Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat;
   [dx]     at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
   [dx]     at com.android.dx.dex.file.DexFile.add(DexFile.java:163)
   [dx]     at com.android.dx.command.dexer.Main.processClass(Main.java:486)
   [dx]     at com.android.dx.command.dexer.Main.processFileBytes(Main.java:455)
   [dx]     at com.android.dx.command.dexer.Main.access$400(Main.java:67)
   [dx]     at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:394)
   [dx]     at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
   [dx]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:131)
   [dx]     at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:109)
   [dx]     at com.android.dx.command.dexer.Main.processOne(Main.java:418)
   [dx]     at com.android.dx.command.dexer.Main.processAllFiles(Main.java:329)
   [dx]     at com.android.dx.command.dexer.Main.run(Main.java:206)
   [dx]     at com.android.dx.command.dexer.Main.main(Main.java:174)
   [dx]     at com.android.dx.command.Main.main(Main.java:95)
   [dx] 1 error; aborting

What should I do?

I’m going to move one of these jar files out of the libs folder in -post-compile target. And then move it back after dex step is finished.
What are your recommendations?

UPDATE:
I’ve tried to move the support package out of one the libraries in -post-compile target but it still fails because of another reason. This jar is already included to the path that is processed by dex task. And dex task cannot open the removed jar.