Essential Android ButterKnife edit forum

Unbinding views in ButterKnife

Fragments have a different view lifecycle than activities. When binding a fragment in onCreateView, set the views to null in onDestroyView. Butter Knife returns an Unbinder instance when you call bind to do this for you. Call its unbind method in the appropriate lifecycle callback.

An example:

public class MyFragment extends Fragment {
  @BindView(R.id.textView) TextView textView;
  @BindView(R.id.button) Button button;
  private Unbinder unbinder;

  @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.my_fragment, container, false);
    unbinder = ButterKnife.bind(this, view);
    // TODO Use fields...
    return view;
  }

  @Override public void onDestroyView() {
    super.onDestroyView();
    unbinder.unbind();
  }
}
Note: Calling unbind() in onDestroyView() is not required, but recommended as it saves quite a bit of memory if your app has a large backstack.

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