invalidateOptionsMenu doesn't work in fragment

Question

I want to show or hide item in actionbar according to either their is text in the edit text or not

so I did the following

            public class NounSearch extends  android.app.Fragment  {  EditText seachEditText;      @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,             Bundle savedInstanceState)     {             super.onCreate(savedInstanceState);             View rootView = inflater.inflate(R.layout.nounsearchactivity, container, false);                     //Intiate EditText             seachEditText =(EditText) rootView.findViewById(R.id.nounSearch);             seachEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {                 @Override                 public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {                     if (actionId == EditorInfo.IME_ACTION_SEARCH) {                         searchResult.Entities = new ArrayList<NounModel>();                         _currentPage = 0;                         categoryId = -1;                         new GetNouns().execute();                         return true;                     }                       return false;                 }             });             seachEditText.addTextChangedListener(new TextWatcher() {                 public void afterTextChanged(Editable s) {                }                 public void beforeTextChanged(CharSequence s, int start,                  int count, int after) {                }                 public void onTextChanged(CharSequence s, int start,                  int before, int count) {                  getActivity().invalidateOptionsMenu();                }               });      }     @Override     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {         super.onCreateOptionsMenu(menu, inflater);              if(seachEditText.getText().toString().length() > 0)             {                 menu.findItem(R.id.action_search).setVisible(true);             }             else             {                 menu.findItem(R.id.action_search).setVisible(false);             }     }      } 

but the actionitem never appear

Answer 1

For updating the onCreateOptionsMenu inside the fragment you need to call the setHasOptionsMenu(true); inside the onCreate method of the fragment. Otherwise you won't be able to update it when you call getActivity().invalidateOptionsMenu();

sample:

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

EDIT:

@Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {         if(seachEditText.getText().toString().length() > 0)         {             menu.findItem(R.id.action_search).setVisible(true);         }         else         {             menu.findItem(R.id.action_search).setVisible(false);         }     super.onCreateOptionsMenu(menu, inflater);   } 

Answer 2

Try this:

@Override public boolean onPrepareOptionsMenu(Menu menu, MenuInflater inflater) {     super.onPrepareOptionsMenu(menu, inflater);     if (seachEditText.getText().toString().length() > 0) {         menu.findItem(R.id.action_search).setVisible(true);     } else {         menu.findItem(R.id.action_search).setVisible(false);     } }