我如何处理android片段backstack？

我有四个片段A B C D。当我从A跳到B、B跳到C、C跳到D时。当我按back键时，如何获得D到B的结果？

片段D:

在碎片中创建一个接口

OnBackListener mback;
    public interface OnBackListener {
        public void onBackClicked();
}

@Override
    public void onAttach(Activity activity) {
        try {
            mback = (OnBackListener ) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnBackListener");
        }
        super.onAttach(activity);
    }


public void methodCall()
    {
      mback.onBackClicked()
    }

 public class MyActivity extends FragmentActivity implements OnBackListener {


// overriding OnBackListener interface method
        @Override
            public void onBackClicked() {

                  //calling fragmentb
            }   

    //Backkey event
        @Override
        public void onBackPressed()
        {
            super.onBackPressed();
            fragmentd.methodCall();
        }

        }

然后

家长活动

实现我们在FragmentD中创建的OnBackListener接口

OnBackListener mback;
    public interface OnBackListener {
        public void onBackClicked();
}

@Override
    public void onAttach(Activity activity) {
        try {
            mback = (OnBackListener ) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnBackListener");
        }
        super.onAttach(activity);
    }


public void methodCall()
    {
      mback.onBackClicked()
    }

 public class MyActivity extends FragmentActivity implements OnBackListener {


// overriding OnBackListener interface method
        @Override
            public void onBackClicked() {

                  //calling fragmentb
            }   

    //Backkey event
        @Override
        public void onBackPressed()
        {
            super.onBackPressed();
            fragmentd.methodCall();
        }

        }

---

在这种情况下，您将获得从碎片到碎片B的结果。

检查此项是否要将信息从D发送回B，还是只显示B？我想使用back键执行从D到B的跳转，但是back键由碎片活动控制。因此，Backclicked（）上的接口调用将无法完成。您好，Androider，如果我想在按back键时得到D到C的结果，有没有更简单的方法？