DexItemFactory dexFactory = new DexItemFactory();

MultiDexFileBytes mdfb = MultiDexFileBytes.createFromZipFile(new File("test.apk"));

// dex reader
MultiDexFileReader mdReader = new MultiDexFileReader(dexFactory);
mdfb.forEach((dexId, dexBytes) -> {
    mdReader.addDexContent(dexId, dexBytes.getDexFileBytes());
});
mdReader.accept(new MultiDexFileVisitor() {

    @Override
    public DexFileVisitor visitDexFile(int dexId) {
        return new DexFileVisitor() {
            @Override
            public DexClassVisitor visitClass(DexClassVisitorInfo classInfo) {
                return new DexClassVisitor() {
                    @Override
                    public void visitBegin() {
                    }

                    @Override
                    public void visitSourceFile(DexString sourceFile) {
                    }
                    @Override
                    public DexAnnotationVisitor visitAnnotation(DexAnnotationVisitorInfo annotationInfo) {
                        return super.visitAnnotation(annotationInfo);
                    }

                    @Override
                    public DexFieldVisitor visitField(DexFieldVisitorInfo fieldInfo) {
                        return super.visitField(fieldInfo);
                    }

                    @Override
                    public DexMethodVisitor visitMethod(DexMethodVisitorInfo methodInfo) {
                        return super.visitMethod(methodInfo);
                    }

                    @Override
                    public void visitEnd() {
                    }
                };
            }
        };
    }
});


// dex node
MultiDexFileNode mdfn = new MultiDexFileNode();
mdReader.accept(mdfn.asVisitor());
Map<Integer, DexFileNode> dexFiles = mdfn.getDexNodes();
dexFiles.forEach((dexId, dexFileNode) -> {
    List<DexClassNode> classes = dexFileNode.getClassesList();
    // ...
});