android - onOptionsItemSelected 没有被调用

Question

我的 fragment 上有这个调用

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Toast.makeText(getActivity(), "otem: " + item.getItemId(), Toast.LENGTH_SHORT).show();
        switch (item.getItemId()) {
            case android.R.id.home:
                getFragmentManager().popBackStack();
                ((ActionBarActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

上面的代码试图做的是在单击操作栏上的后退按钮(主页按钮)时实际转到上一个 Intent ，而不是显示抽屉导航。但似乎 fragment 中 onOptionsItemSelected 内的所有内容都没有被执行。 (因为如果是，它会显示一个 toast 。我还在那里放了一个换行符)为什么？

MainActivity.java

public class MainActivity extends ActionBarActivity
        implements NavigationDrawerFragment.NavigationDrawerCallbacks {
private NavigationDrawerFragment mNavigationDrawerFragment;
@Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
        if (intent.getStringExtra("intentCaller").equals("expensesRecurring")){
            Bundle bundle = new Bundle();
            bundle.putString("tab", "1");
            Fragment fragment = new MenuExpenses();
            fragment.setArguments(bundle);
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.container, fragment, "fragmentExpenses")
                    .commit();
        }

    }

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        if (toolbar != null) {
            setSupportActionBar(toolbar);
        }

        mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
        mTitle = getTitle();

        // Set up the drawer.
        mNavigationDrawerFragment.setUp(
                R.id.navigation_drawer,
                (DrawerLayout) findViewById(R.id.drawer_layout));



    }

@Override
    public void onNavigationDrawerItemSelected(int position) {
        // update the main content by replacing fragments
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
                .commit();
    }

public void onSectionAttached(int number) {
        switch (number) {
            case 0:
                mTitle = getString(R.string.menu_home);
                break;
            case 1:
                mTitle = getString(R.string.menu_analyze);
                break;
            case 2:
                mTitle = getString(R.string.menu_expenses);
                break;
            case 3:
                mTitle = getString(R.string.menu_income);
                break;
        }
    }

    public void restoreActionBar() {
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setTitle(mTitle);
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowHomeEnabled(true);
    }

@Override
    public boolean onCreateOptionsMenu(Menu menu) {

        if (!mNavigationDrawerFragment.isDrawerOpen()) {
            // Only show items in the action bar relevant to this screen
            // if the drawer is not showing. Otherwise, let the drawer
            // decide what to show in the action bar.
            //getMenuInflater().inflate(R.menu.main, menu);
            restoreActionBar();
            return true;
        }
        return super.onCreateOptionsMenu(menu);
    }

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        /*
        if (id == R.id.action_settings) {
            return true;
        }*/
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }

        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            //((MainActivity) activity).onSectionAttached(getArguments().getInt(ARG_SECTION_NUMBER));
        }
    }

    @Override
    public void onBackPressed() {
        int fragments = getFragmentManager().getBackStackEntryCount();
        if (fragments == 1) {
            // make layout invisible since last fragment will be removed
        }
        super.onBackPressed();
    }

NavigationDrawerFragment.java

public class NavigationDrawerFragment extends Fragment {
private NavigationDrawerCallbacks mCallbacks;
    private ActionBarDrawerToggle mDrawerToggle;

    private DrawerLayout mDrawerLayout;
    private ListView mDrawerListView;
    private View mFragmentContainerView;

    private int mCurrentSelectedPosition = 1;
    private boolean mFromSavedInstanceState;
    private boolean mUserLearnedDrawer;

    public NavigationDrawerFragment() {
    }

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

        // Retain this fragment across configuration changes - added to make sure data in fragment retains after orientation changes
        setRetainInstance(true);

        // Read in the flag indicating whether or not the user has demonstrated awareness of the
        // drawer. See PREF_USER_LEARNED_DRAWER for details.
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
        mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

        if (savedInstanceState != null) {
            mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
            mFromSavedInstanceState = true;
        }

        // Select either the default item (0) or the last selected item.
        selectItem(mCurrentSelectedPosition);


    }

@Override
    public void onActivityCreated (Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // Indicate that this fragment would like to influence the set of actions in the action bar.
        setHasOptionsMenu(true);
        mDrawerListView.setAdapter(new ArrayAdapter<String>(
                ((ActionBarActivity) getActivity()).getSupportActionBar().getThemedContext(),
                android.R.layout.simple_list_item_activated_1,
                android.R.id.text1,
                new String[]{
                        getString(R.string.menu_home),
                        getString(R.string.menu_analyze),
                        getString(R.string.menu_expenses),
                        getString(R.string.menu_income),
                        getString(R.string.menu_moneyJar),
                        getString(R.string.menu_goal),
                        getString(R.string.menu_report),
                        getString(R.string.menu_settings),
                }));
    }

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        mDrawerListView = (ListView) inflater.inflate(
                R.layout.fragment_navigation_drawer, container, false);
        mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                selectItem(position);
            }
        });
        mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
        ViewGroup mTop = (ViewGroup)inflater.inflate(R.layout.drawer_header, mDrawerListView, false);
        mDrawerListView.addHeaderView(mTop, null, false);
        return mDrawerListView;
    }

    public boolean isDrawerOpen() {
        return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
    }

public void setUp(int fragmentId, DrawerLayout drawerLayout) {
        mFragmentContainerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = drawerLayout;

        // set a custom shadow that overlays the main content when the drawer opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        // set up the drawer's list view with items and click listener

        ActionBar actionBar = ((ActionBarActivity) getActivity()).getSupportActionBar();
        //actionBar.setHomeButtonEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);
        //actionBar.setDisplayShowHomeEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the navigation drawer and the action bar app icon.
        mDrawerToggle = new ActionBarDrawerToggle(
                getActivity(),                    /* host Activity */
                mDrawerLayout,                    /* DrawerLayout object */
                R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
                R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
        ) {
            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if (!isAdded()) {
                    return;
                }

                //getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (!isAdded()) {
                    return;
                }

                if (!mUserLearnedDrawer) {
                    // The user manually opened the drawer; store this flag to prevent auto-showing
                    // the navigation drawer automatically in the future.
                    mUserLearnedDrawer = true;
                    SharedPreferences sp = PreferenceManager
                            .getDefaultSharedPreferences(getActivity());
                    sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
                }

                getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
            }
        };

        // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
        // per the navigation drawer design guidelines.
        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
            mDrawerLayout.openDrawer(mFragmentContainerView);
        }

        // Defer code dependent on restoration of previous instance state.
        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });

        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }

    private void selectItem(int position) {
        mCurrentSelectedPosition = position;
        if (mDrawerListView != null) {
            mDrawerListView.setItemChecked(position, true);
        }
        if (mDrawerLayout != null) {
            mDrawerLayout.closeDrawer(mFragmentContainerView);
        }
        if (mCallbacks != null) {
            mCallbacks.onNavigationDrawerItemSelected(position);
        }

        Fragment fragment = null;
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        switch (position) {
            case 1:
                fragment = new MenuHome();
                transaction.replace(R.id.container, fragment, "fragmentHome");
                transaction.addToBackStack(null);
                transaction.commit();
                break;
            case 2:
                fragment = new MenuAnalyze();
                transaction.replace(R.id.container, fragment, "fragmentAnalyze");
                transaction.addToBackStack(null);
                transaction.commit();
                break;
            case 3:
                fragment = new MenuExpensesDaily();
                transaction.replace(R.id.container, fragment, "fragmentExpenses");
                transaction.addToBackStack(null);
                transaction.commit();
                break;
            default:
                break;
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mCallbacks = (NavigationDrawerCallbacks) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mCallbacks = null;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Forward the new configuration the drawer toggle component.
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        if (mDrawerLayout != null && isDrawerOpen()) {
            inflater.inflate(R.menu.global, menu);
            showGlobalContextActionBar();
        }
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    private void showGlobalContextActionBar() {
        ActionBar actionBar = ((ActionBarActivity) getActivity()).getSupportActionBar();
        actionBar.setTitle(R.string.app_name);
    }

MenuExpensesAdd.java (这就是它的 onOptionsItemSelected 没有被调用的问题)

public class MenuExpensesAdd extends Fragment{

public static MenuExpensesAdd newInstance(int year, int month) {
        MenuExpensesAdd frag = new MenuExpensesAdd();
        Bundle args = new Bundle();
        args.putInt("year", year);
        args.putInt("month", month);
        frag.setArguments(args);
        return frag;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setHasOptionsMenu(true);
        setRetainInstance(true);
        initYear = getArguments().getInt("year");
        initMonth = getArguments().getInt("month");
    }

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View root = inflater.inflate(R.layout.expenses_add, container, false);

        TextView tbTvTitle = (TextView)  getActivity().findViewById(R.id.tbTvTitle);
        tbTvTitle.setVisibility(View.VISIBLE);
        tbTvTitle.setText("Add New Expenses");
        tbIbSave = (ImageButton) getActivity().findViewById(R.id.tbIbSave);
        tbIbSave.setVisibility(View.VISIBLE);
        Spinner tbSpnMonth = (Spinner)  getActivity().findViewById(R.id.tbSpnMonth);
        tbSpnMonth.setVisibility(View.GONE);
        Spinner tbSpnYear = (Spinner)  getActivity().findViewById(R.id.tbSpnYear);
        tbSpnYear.setVisibility(View.GONE);

/* some more codes */
return root;
}

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
    {
        super.onCreateOptionsMenu(menu, inflater);
        android.support.v7.app.ActionBar actionBar = ((ActionBarActivity)getActivity()).getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(false);
        actionBar.setDisplayShowTitleEnabled(false);
    }

    @Override
    public void onPrepareOptionsMenu (Menu menu)
    {
        super.onPrepareOptionsMenu(menu);
        android.support.v7.app.ActionBar actionBar = ((ActionBarActivity)getActivity()).getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowTitleEnabled(false);


        //fragment specific menu creation
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Toast.makeText(getActivity(), "otem: " + item.getItemId(), Toast.LENGTH_SHORT).show();
        switch (item.getItemId()) {
            case android.R.id.home:
                getFragmentManager().popBackStack();
                ((ActionBarActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

Answer 1

你打电话了吗this.setHasOptionsMenu(true);在 onCreate() ?

Report that this fragment would like to participate in populating the options menu by receiving a call to onCreateOptionsMenu(Menu, MenuInflater) and related methods.

文档: http://developer.android.com/reference/android/app/Fragment.html#setHasOptionsMenu(boolean)

更多阅读: http://developer.android.com/guide/components/fragments.html#ActionBar