我在片段上调用了这个
@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);
}
上面的代码试图在单击操作栏上的后退按钮（主页按钮）时实际转到上一个意图，而不是显示导航抽屉。但似乎片段中onOptionsItemSelected内的所有内容都没有被执行。 （因为如果它，它会显示一个祝酒词......我也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（此处存在未调用其onOptionsItemSelected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);
}
答案 0 :(得分：3)
您是否在this.setHasOptionsMenu(true);中致电onCreate()了？
报告此片段希望通过接收对onCreateOptionsMenu（Menu，MenuInflater）和相关方法的调用来参与填充选项菜单。
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