Butterknife-createBinding.java

private static Unbinder createBinding(@NonNull Object target, @NonNull View source) {
  Class<?> targetClass = target.getClass();
  ...
  Constructor<? extends Unbinder> constructor = findBindingConstructorForClass(targetClass);
  ...
  try {
    return constructor.newInstance(target, source);
  }
  ...
}

@Nullable @CheckResult @UiThread
private static Constructor<? extends Unbinder> findBindingConstructorForClass(Class<?> cls) {
  Constructor<? extends Unbinder> bindingCtor;
  ... // Removed cache code
  String clsName = cls.getName();
  ...
  try {
    Class<?> bindingClass = cls.getClassLoader().loadClass(clsName + "_ViewBinding");
    ...
    bindingCtor = (Constructor<? extends Unbinder>) bindingClass.getConstructor(cls, View.class);
    ...
  }
  ...
  return bindingCtor;
}