Android开发：fragment将事件传递回activity

fragment触发事件后传递会给activity，可以通过在fragment中定义一个接口，让activity实现这个接口。

具体代码如下

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实现OnFragmentInteractionListener这个接口，在fragment中调用onFragmentInteraction，就能将事件传递给activity。