public MethodId adjust(MethodId methodId) {
    return new MethodId(
        target,
        adjustType(methodId.getDeclaringClassIndex()),
        adjustProto(methodId.getProtoIndex()),
        adjustString(methodId.getNameIndex()));
  }
Maps the index offsets from one dex file to those in another. For example, if you have string #5
in the old dex file, its position in the new dex file is {@code strings[5]}.
android/android_framework/dex-maker/src/main/java/com/android/dx/merge/IndexMap.java