DialogFragment了解一下？

//传统的new AlertDialog在屏幕旋转时，第一不会保存用户输入的值，第二还会报异常，因为Activity销毁前不允许对话框未关闭。
// 而通过DialogFragment实现的对话框则可以完全不必考虑旋转的问题
public class MyDialogFragment extends DialogFragment {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;
    private Button dialogBtn;

//    private OnFragmentInteractionListener mListener;

    public MyDialogFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment MyDialogFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static MyDialogFragment newInstance(String param1, String param2) {
        MyDialogFragment fragment = new MyDialogFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }


    //DialogFragment做屏幕适配时只能重写onCreateView，重写onCreateDialog时对话框显示不出来，不做屏幕适配的话重写onCreateView和onCreateDialog其中一个就可以
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_my_dialog, container, false);
        dialogBtn = (Button)view.findViewById(R.id.dialogBtn);
        return view;
    }

//    @Override
//    public Dialog onCreateDialog(Bundle savedInstanceState) {
//        View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_my_dialog, null, false);
//        dialogBtn = (Button)view.findViewById(R.id.dialogBtn);
//        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
//        builder.setView(view);
//        builder.setPositiveButton("confirm", new DialogInterface.OnClickListener() {
//            @Override
//            public void onClick(DialogInterface dialog, int which) {
//                dialog.dismiss();
//            }
//        }).setNegativeButton("cancel", new DialogInterface.OnClickListener() {
//            @Override
//            public void onClick(DialogInterface dialog, int which) {
//                dialog.dismiss();
//            }
//        });
//        return builder.create();
//    }

    // TODO: Rename method, update argument and hook method into UI event
    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;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }

}

如何调用：

MyDialogFragment myDialogFragment = new MyDialogFragment();

//一个对话框在大屏幕上以对话框的形式展示，而小屏幕上则直接嵌入当前的Actvity中
//DialogFragment做屏幕适配时只能重写onCreateView，重写onCreateDialog时对话框显示不出来，不做屏幕适配的话重写onCreateView和onCreateDialog其中一个就可以
boolean isLargeLayout = getResources().getBoolean(R.bool.large_layout);
Log.i("wanlijun","isLargeLayout="+isLargeLayout);
if(isLargeLayout){
    myDialogFragment.show(getSupportFragmentManager(),"DialogFragment");
}else{
    transaction = getSupportFragmentManager().beginTransaction();
    transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
    transaction.replace(R.id.containerFragment,myDialogFragment);
    transaction.commit();
}