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Editorial Team
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Asked: 2026-06-06T19:13:19+00:00

I am doing some hacking on Jan Berkel’s SBT Android Plugin and I was

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I am doing some hacking on Jan Berkel’s SBT Android Plugin and I was wandering if there is a way to merge multiple .dex files into one .dex file that will contain all of them.

For example, if I have this: 

classes1.dex
classes2.dex
classes3.dex

Is there any way to merge them using Scala (in some acceptable time) to one single classes.dex file that will contain all 3 of them and have a following structure: 

classes.dex
|-- classes1/...
|-- classes2/...
\-- classes3/...
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1 Answer

  1. Editorial Team

    OK, it seems I found something. 

    import com.android.dx.io.DexBuffer
import com.android.dx.DexMerger
import com.android.dx.merge.CollisionPolicy
...
val dexA = DexBuffer(File(classes1DexFilePath))
val dexB = DexBuffer(File(classes2DexFilePath))
val dexMerger = DexMerger(dexA, dexB, CollisionPolicy.FAIL)
val dexM = dexMerger.merge()
dexM.writeTo(File(classesDexFilePath))

    Could anyone verify this is indeed working?

    Also, if this works, then merging more than 2 dex files should be the same as Max(Max(A, B), C), providing you write a method that with a prototype
    DexBuffer merge(DexBuffer dexA, DexBuffer dexB)

    Sources:
    DexMerger
    DexBuffer
    CollisionPolicy

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