Dialog Fragment 에서 값 리턴시에 Fragment에서 받는 법 [closed]

Question

https://github.com/kenodoggy/FragmentSamples/blob/master/DialogFragment/app/src/main/java/com/kenodoggy/dialogfragment/SampleDialogFragment.java

 

제 질문은 이 소스코드를 사용해서 진행한 프로젝트에 대한 것입니다.

public class MainActivity extends AppCompatActivity implements SampleDialogFragment.OnDialogDismissed {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button hello = (Button) findViewById(R.id.activity_main_btn_hello);
        Button goodbye = (Button) findViewById(R.id.activity_main_btn_goodbye);
        hello.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDialog(SampleDialogFragment.HELLO);
            }
        });
        goodbye.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDialog(SampleDialogFragment.GOODBYE);
            }
        });
    }
    public void showDialog(String salutation) {
        SampleDialogFragment.newInstance(salutation).show(getFragmentManager(), SampleDialogFragment.TAG);
    }
    @Override
    public void onDialogDismissed(String whichSalutation) {
        if (whichSalutation.equals(SampleDialogFragment.GOODBYE)) {
            Toast.makeText(this, "Thank you!", Toast.LENGTH_SHORT).show();
        }
    }
}

public class SampleDialogFragment extends DialogFragment implements DialogInterface.OnClickListener {
    public static final String TAG = "SampleDialogFragment";
    public static final String HELLO = "hello";
    public static final String GOODBYE = "goodbye";
    private static final String WHICH_SALUTATION = "salutation";

    private String mSalutation;
    private OnDialogDismissed mDialogDismissedCallback;

    public interface OnDialogDismissed {
        void onDialogDismissed(String whichSalutation);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mDialogDismissedCallback = (OnDialogDismissed)activity;
        } catch (ClassCastException cce) {
            Log.e("Error", getClass().getSimpleName() + ", calling Activity must implement OnDialogDismissed");
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_sample_dialog, null);

        // set values based on which salutation (hello, goodbye) passed when this fragment was instantiated
        String titleText;
        ImageView image = (ImageView) view.findViewById(R.id.fragment_sample_dialog_imageview);
        if (mSalutation.equals(HELLO)) {
            titleText = getResources().getString(R.string.fragment_sample_dialog_txt_hello);
            image.setImageResource(R.drawable.scottish_fold_ds_400w);
        } else {
            titleText = getString(R.string.fragment_sample_dialog_txt_goodbye);
            image.setImageResource(R.drawable.kitten_wave);
        }

        // create custom title TextView
        TextView title = new TextView(getActivity());
        title.setText(titleText);
        title.setPadding(0, 40, 0, 0);
        title.setGravity(Gravity.CENTER);
        title.setTextColor(getResources().getColor(R.color.colorAccent));
        title.setTextSize(30);

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        return(builder
                .setView(view)
                .setCustomTitle(title)
                .setPositiveButton(R.string.close, this)
                .create());
    }


    public static SampleDialogFragment newInstance(String salutation) {
        SampleDialogFragment fragment = new SampleDialogFragment();
        Bundle args = new Bundle();
        args.putString(WHICH_SALUTATION, salutation);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (getArguments() != null) {
            mSalutation = getArguments().getString(WHICH_SALUTATION);
        }
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // display a toast message on the screen when the dialog is dismissed for GOODBYE dialog only
        if (mSalutation.equals(GOODBYE)) {
            mDialogDismissedCallback.onDialogDismissed(GOODBYE);
        }
    }
}

 

이 코드는.. MainActivity 에서 버튼을 눌러 

SampleDialogFragment 를 화면에 띄우고,

종료시에 값을 되돌려 주는 아주 훌륭한 DialogFragment 인듯합니다.

 

그런데.. 이걸로 예제처럼 Activity->Dialog Fragment 일 땐 잘 사용을 했지만,

Fragment -> DialogFragment 일 땐 값을 되돌리는 것을 못하겠어요..

 

우선  DialogFragment ->  MainActivity -> Fragment 의 2단계로 가야하는건 알것같습니다.

그런데 DialogFragment -> MainAcitivty 까지는 알겠는데, 그리고 값을 받아오기는 하는데,

MainActivity-> Fragment로 바로 넘겨지는게 어렵네요..

 

답변 기다릴게요...

 

 

Answer 1

public class SampleDialogFragment extends DialogFragment implements DialogInterface.OnClickListener {
	...
    private OnDialogDismissed mDialogDismissedCallback;
 
    public interface OnDialogDismissed {
        void onDialogDismissed(String whichSalutation);
    }
 
    /*@Override			============주석 처리====================
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mDialogDismissedCallback = (OnDialogDismissed)activity;
        } catch (ClassCastException cce) {
            Log.e("Error", getClass().getSimpleName() + ", calling Activity must implement OnDialogDismissed");
        }
    }
	*/
	
	//추가
	public void setOnDialogDismissedListener(OnDialogDismissed listener){
		mDialogDismissedCallback = listener;
	}
 
    ...
}

public class MainFragment extends Fragment implements DialogInterface.OnClickListener{
	...
	
	public void showDialog(String salutation) {
        SampleDialogFragment dialogFragment = SampleDialogFragment.newInstance(salutation);
		dialogFragment.setOnDialogDismissedListener(this);	//추가
		dialogFragment.show(getFragmentManager(), SampleDialogFragment.TAG);
    }
	...
	
	@Override
    public void onDialogDismissed(String whichSalutation) {
        if (whichSalutation.equals(SampleDialogFragment.GOODBYE)) {
            Toast.makeText(this, "Thank you!", Toast.LENGTH_SHORT).show();
        }
    }
}

Answer 2

브로드캐스트로 처리하시면 될 것 같네요.

Answer 3

콜백을 구현한 아주 훌륭한 DialogFragmen 로군요!

일단 액티비티에 전달받을 플래그먼트를 생성하시고

Fragment b = new Fragment();

콜백구현체에서 콜백을 받습니다

@Override

    public void onDialogDismissed(String whichSalutation) {

        if (whichSalutation.equals(SampleDialogFragment.GOODBYE)) {

            Toast.makeText(this, "Thank you!", Toast.LENGTH_SHORT).show();

            // b Fragment애 전달합니다

             Bundle bundle = new Bundle();

             bundle.putString("key","value");

             b.setArguments();

             FragmentManager fm = getFragmentManager();

             fm.begintransaction().replace(R.id.content, b).commit();

        }

    }

 

//b fragment onCreate 메소드에서

if(getArguments() != null){

       String param = getArguments().getString("key");

}

 

//출처:https://medium.com/@henen/%EB%B9%A0%EB%A5%B4%EA%B2%8C%EB%B0%B0%EC%9A%B0%EB%8A%94-%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-fragment-4-fragment%EA%B0%84-%EC%97%90-%EB%8D%B0%EC%9D%B4%ED%84%B0%EC%A0%84%EB%8B%AC-c6ab1d0766af#.utxmx5rxu

 

//추신: 저라면 그냥 static 변수 하나 선언해놓고 접근하겠습니다.

Answer 4

Callback interface 가 존재하니 응답이 필요한 Fragment 에 SampleDialogFragment.OnDialogDismissed 를 implements 하시면 되죠


OtherFragment extends Fragment implements SampleDialogFragment.OnDialogDismissed {

// TODO

}

Comments

이건 안되더라구요..
프래그먼트에서 dialogfragment를 오픈해도 액티비티가 가져가서..

---

오픈해도 액티비티가 가져간다는게 무슨 의미일까요??
단순 인터페이스인데  안된다는게 이해 되지 않습니다.