Null pointer on setHasOptionsMenu(boolean)

Question

I have an activity which leverages Navigation drawer and I have three fragment children attached in this. I have an Action Bar search implemented, while as everything is working fine on a 5.0 device, I am facing hiccups on a 4.0.3 device on one of the fragments. I am implementing search as follows:

SearchView searchView;

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

        inflater.inflate(R.menu.main, menu); 
        searchView = (SearchView)menu.findItem(R.id.search).getActionView();
        searchView.setSubmitButtonEnabled(false);


        SearchView.OnQueryTextListener textChangeListener = new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextChange(String newText){

                if (TextUtils.isEmpty(newText)){

                    CursorAdapter filterAdapter = (CursorAdapter) Cur;
                    filterAdapter.getFilter().filter(newText.toString());
                    searchView.clearFocus();
                }
                else {
                    CursorAdapter filterAdapter = (CursorAdapter) Cur;
                    filterAdapter.getFilter().filter(newText.toString());
                }

                return true;
            }

            @Override
            public boolean onQueryTextSubmit(String query) {
                return true;
            }
        };
        Cur.setFilterQueryProvider(new FilterQueryProvider() {
            public Cursor runQuery(CharSequence constraint) {
                return dbHelper.getSearchList(constraint);
            }
        });searchView.setOnQueryTextListener(textChangeListener);
        super.onCreateOptionsMenu(menu,inflater); 
    }

At the start the first fragment works fine, when I use the Navigation drawer to select a different fragment my app crashes, here is the log cat:

11-25 17:00:17.554: E/AndroidRuntime(6667): java.lang.NullPointerException
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.exa.FragmentTab2.onCreateOptionsMenu(FragmentTab2.java:4477)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl.dispatchCreateOptionsMenu(FragmentManager.java:1871)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.Activity.onCreatePanelMenu(Activity.java:2489)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:395)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:760)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.Activity.invalidateOptionsMenu(Activity.java:2607)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl.invalidateOptionsMenu(FragmentManager.java:1950)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.Fragment.setHasOptionsMenu(Fragment.java:901)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.exa.FragmentTab2.onCreateView(FragmentTab2.java:298)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.BackStackRecord.run(BackStackRecord.java:635)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.os.Handler.handleCallback(Handler.java:615)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.os.Looper.loop(Looper.java:153)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at android.app.ActivityThread.main(ActivityThread.java:5000)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at java.lang.reflect.Method.invokeNative(Native Method)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at java.lang.reflect.Method.invoke(Method.java:511)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
11-25 17:00:17.554: E/AndroidRuntime(6667):     at dalvik.system.NativeStart.main(Native Method)

in OnCreate the log refers to this statement:

setHasOptionsMenu(true);

in the onCreateOptionsMenu the log refers to:

Cur.setFilterQueryProvider(new FilterQueryProvider() 

I am very sure that my Cursor is not null.

EDIT

I removed the

  Cur.setFilterQueryProvider(new FilterQueryProvider() {
            public Cursor runQuery(CharSequence constraint) {
                return dbHelper.getSearchList(constraint);
            }
        });

to onCreate and now I am getting a null pointer at:

filterAdapter.getFilter().filter(newText.toString());

Answer 1

I am very sure that my Cursor is not null.

I am even more sure that you are incorrect. The only way to get a NullPointerException on that line is if Cur is null.

Please move your setFilterQueryProvider() to a better place, such as where you assign Cur a value. Note that your setFilterQueryProvider() does not need to be in onCreateOptionsMenu(), as it has nothing to do with onCreateOptionsMenu() (e.g., it does not need the Menu or MenuInflater objects).