Android開發：fragment將事件傳遞回activity

fragment觸發事件后傳遞會給activity，可以通過在fragment中定義一個接口，讓activity實現這個接口。

具體代碼如下

public class AAFragment extends Fragment {
    private OnFragmentInteractionListener mListener;

   public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

   
    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
    }
}

只要activity實現OnFragmentInteractionListener這個接口，在fragment中調用onFragmentInteraction，就能將事件傳遞給activity。