我该如何处理android Fragment backstack？

Question

我有四个片段ABCD。当我执行从A到B的跳跃以及从B到C的跳跃以及从C到D的跳跃时，按返回键如何获得D到B的结果？

Answer 1

FragmentD:

Create an interface in FragmentD.

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()
    }

then

Parent Activity

Implement the OnBackListener interface that we created in FragmentD.

 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();
        }

        }

In the way, you will get result of fragmentD to fragmentB.