[SOLVED] How to make dex2jar to skip certain classes while converting dex to jar?

How to make dex2jar to skip certain classes while converting dex to jar?

I'm making an application that uses the dex2jar library to convert a dex file (from an android application package) to a jar file. But the process takes quite long especially due to android.support.x classes. Is there a way to make dex2jar skip certain classes (that we specify) while decompiling ?

This is the code that I'm currently using:

DexFileReader reader = new DexFileReader(new File(PackageDir));
Dex2jar.from(reader)
.reUseReg(reuseReg)
.topoLogicalSort(topologicalSort || topologicalSort1)
.skipDebug(!debugInfo)
.optimizeSynchronized(optmizeSynchronized)
.printIR(printIR)
.verbose(verbose)
.to(file);

Solution

You could use dexlib2 to load the dex file, remove the classes you're not interested in, and then build a new dex file

int api = 19;
DexFile dexFile = DexFileFactory.loadDexFile(dexFilePath, api);

List<ClassDef> classes = new ArrayList<ClassDef>();

for (ClassDef classDef: dexFile.getClasses()) {
    if (!classDef.getType().startsWith("Landroid/support/")) {
        classes.add(classDef);
    }
}

dexFile = new ImmutableDexFile(classes);
DexFileFactory.writeDexFile(dexFilePath, dexFile);