如何引用内部实现的类的片段？

Question

我有一个活动，有一些相同类型的片段。我有一份清单。只要我点击一个列表项，我就需要调用一个activity方法，传递点击发生的片段。

我认为这是一个相当愚蠢的问题，但我搞不懂。

public class MapFragment extends Fragment {

    Activity activity;

    public void onAttach(Activity activity) {
        super.onAttach(activity);
        this.activity = activity;
    }

    public MapFragment() {
        /* here I could refer to the fragment using "this" */
    }

    private class MyListOnItemClick implements AdapterView.OnItemClickListener {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            /* how can I refer to the fragment here?  */

            Fragment f = getFragmentSomeWay();

            (CustomActivity)activity.doSomethingWith(f);

        }
    }
}

Answer 1

您的片段可以实现AdapterView。OnItemClickListener。

public class MapFragment extends Fragment implements AdapterView.OnItemClickListener {

  @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
           requireActivity().doSomethingWith(f);

        }

有些人会在这里使用匿名类。

 adapter.setOnItemClickListener(AdapterView.OnItemClickListener listener = new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(final AdapterView<?> adapterView, final View view, final int i, final long l) {
                requireActivity().doStuff();
            }
        };

Answer 2

只需参考封闭类这个：

  Fragment f = MapFragment.this;