Styjun

I have 2 fragment one is my parent fragment inside i have one child fragment and i want to pass my both fragment data to activity i have declare interface for that communication but
getting null response every time i have problem to assign interface method value in fragment because i have declare in
on create ().
i have send date of multiple edit text value and spinner value when activity button click.

 public class AddSubQuestion extends Fragment implements AdapterView.OnItemSelectedListener 

 private TextView addNewQuestxt;
 private AppCompatSpinner choiceSpinner;
 private String[] choiceList = "Single Choice", "Multiple Choice", "Multi-Line Text";
 private RelativeLayout relativeSpinner, relativeLayoutSingleChoice, relativeLayoutMultipleChoice, relativeLayoutMultiLinesChoice;
 private EditText questionTxt1, answerTxt1, answerTxt1_multiple, answerTxt2_multiple, answerTxt3_multiple, answerTxt4_multiple, answerTxt1_multiline;
 private TextView addNewSubSingle, addNewSubMultiple, addNewSubMultiline;
 private String questTxt, ansSingleTxt, ansMultipleTxt1, ansMultipleTxt2, ansMultipleTxt3, ansMultipleTxt4, ansMultilineTxt1;
 private static final String TAG = AddSubQuestion.class.getSimpleName();

 /* public static Object newInstance() 
 return null;
 
*/
 @Override
 public void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 

 public AddSubQuestion() 
 

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) 
 // Inflate the layout for this fragment
 View view = inflater.inflate(R.layout.activity_add_sub_new_question, container, false);

 addNewQuestxt = view.findViewById(R.id.plus_btn);

 relativeSpinner = view.findViewById(R.id.spinner_relative);
 relativeLayoutSingleChoice = view.findViewById(R.id.singlechoice_relative);
 relativeLayoutMultipleChoice = view.findViewById(R.id.multiplechoice_relative);
 relativeLayoutMultiLinesChoice = view.findViewById(R.id.multilinechoice_relative);

 questionTxt1 = view.findViewById(R.id.question_edit1);

 //single choice
 answerTxt1 = view.findViewById(R.id.answer_edit1);

 addNewSubSingle = view.findViewById(R.id.plus_btn_singlechoice);

 //multiple choice
 answerTxt1_multiple = view.findViewById(R.id.answer_edit11);
 answerTxt2_multiple = view.findViewById(R.id.answer_edit22);
 answerTxt3_multiple = view.findViewById(R.id.answer_edit33);
 answerTxt4_multiple = view.findViewById(R.id.answer_edit44);

 addNewSubMultiple = view.findViewById(R.id.plus_btn_multiple);

 //mutilines choice
 answerTxt1_multiline = view.findViewById(R.id.answer_edit111);
 addNewSubMultiline = view.findViewById(R.id.plus_btn_multiline);


 choiceSpinner = view.findViewById(R.id.choice_spinner);

 choiceSpinner.setOnItemSelectedListener(this);

 //Creating the ArrayAdapter instance having the country list
 ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getActivity(),
 android.R.layout.simple_spinner_item, choiceList);
 spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 //Setting the ArrayAdapter data on the Spinner
 choiceSpinner.setAdapter(spinnerAdapter);

 return view;
 

 @Override
 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) 
 Toast.makeText(getActivity(), choiceList[position], Toast.LENGTH_LONG).show();
 if (choiceList[position].equalsIgnoreCase("Multiple Choice")) 
 Log.d(TAG, "onItemSelected: multiple choice :");
 relativeLayoutSingleChoice.setVisibility(View.GONE);
 relativeLayoutMultiLinesChoice.setVisibility(View.GONE);
 relativeLayoutMultipleChoice.setVisibility(View.VISIBLE);
 else if (choiceList[position].equalsIgnoreCase("Multi-Line Text")) 
 Log.d(TAG, "onItemSelected: multi line text");
 relativeLayoutMultipleChoice.setVisibility(View.GONE);
 relativeLayoutSingleChoice.setVisibility(View.GONE);
 relativeLayoutMultiLinesChoice.setVisibility(View.VISIBLE);
 else 
 relativeLayoutSingleChoice.setVisibility(View.VISIBLE);
 relativeLayoutMultiLinesChoice.setVisibility(View.GONE);
 relativeLayoutMultipleChoice.setVisibility(View.GONE);
 
 


 public MultipleChoiceQuesData getMultipleText() 
 MultipleChoiceQuesData questionData = new MultipleChoiceQuesData();

 questionData.setChoice(choiceSpinner.getSelectedItem().toString());
 questionData.setQuestion(questionTxt1.getText().toString());
 questionData.setAnswer(answerTxt1_multiple.getText().toString().trim());
 questionData.setAnswer2(answerTxt2_multiple.getText().toString().trim());
 questionData.setAnswer3(answerTxt3_multiple.getText().toString().trim());
 questionData.setAnswer4(answerTxt4_multiple.getText().toString().trim());
 //return questionData;

 return questionData;
 

 public String getChoice() 
 return choiceSpinner.getSelectedItem().toString();
 

 public MultilinesChoiceQueData getMultilinesText() 
 MultilinesChoiceQueData multilinesChoiceQueData = new MultilinesChoiceQueData();

 multilinesChoiceQueData.setChoice(choiceSpinner.getSelectedItem().toString());
 multilinesChoiceQueData.setQuestion(questionTxt1.getText().toString().trim());
 multilinesChoiceQueData.setAnswer(answerTxt1_multiple.getText().toString().trim());

 return multilinesChoiceQueData;
 

 public SingleChoiceQuesData getSingleChoiceText() 
 SingleChoiceQuesData singleChoiceQuesData = new SingleChoiceQuesData();

 singleChoiceQuesData.setChoice(choiceSpinner.getSelectedItem().toString());
 singleChoiceQuesData.setQuestion(questionTxt1.getText().toString().trim());
 singleChoiceQuesData.setAnswer(answerTxt1.getText().toString().trim());

 return singleChoiceQuesData;
 
 @Override
 public void onNothingSelected(AdapterView<?> parent) 

 
 public interface OnChildDataPass 
 public void onChildDataPass(String data);
 

here is my child fragment