How to add submenu items to ActionBar action in code?

问题:

Via xml I can add submenu items to my action in the ActionBar.

main_menu.xml:

But how can I add these sub items via Java code? It doesn't work as below, the sub items are getting added to the wrong action (and also the drawable isn't shown), the very right button, not my 'New Form' button:

main_menu.xml:

Java Code:

@Override public boolean onCreateOptionsMenu(Menu menu) {     super.onCreateOptionsMenu(menu);     MenuInflater inflater = getMenuInflater();     inflater.inflate(R.menu.main_menu, menu);      Log.d("MainMenu", ",menu title0: " + menu.getItem(0).getTitle());      // returns "New Form"      menu.addSubMenu(0, Menu.NONE, 1, "Form 1").setIcon(R.drawable.attachment);     menu.addSubMenu(0, Menu.NONE, 2, "Form 2").setIcon(R.drawable.attachment);     return true; } 

Is there a way to achieve this, adding sub menu items via Java Code instead of XML, without using a PopupMenu (http://developer.android.com/guide/topics/ui/menus.html#PopupMenu)?

Update (Solution):

My final code snippet I ended up with to populate the submenu dynamically, following adamp's reply:

// menu options private static final int MENU_PREFERENCES = Menu.FIRST; private static final int MENU_LOGOUT = 2;  @Override public boolean onCreateOptionsMenu(final Menu menu) {     super.onCreateOptionsMenu(menu);      MenuInflater inflater = getMenuInflater();     inflater.inflate(R.menu.main_menu, menu);     menu.add(0, MENU_PREFERENCES, 0, getString(R.string.general_preferences)).setIcon(             android.R.drawable.ic_menu_preferences);      // load all available form templates     Cursor c = managedQuery(FormsProviderAPI.FormsColumns.CONTENT_URI, null, null, null, null);     try {         int ixDisplayName = c.getColumnIndex(FormsProviderAPI.FormsColumns.DISPLAY_NAME);         int ixId = c.getColumnIndex(FormsProviderAPI.FormsColumns._ID);         int cnt = 0;         while (c.moveToNext()) {             cnt++;             Log.d("ID: ", "ID: "+ c.getInt(ixId));  // misusing the group id for the form id             menu.getItem(1).getSubMenu().addSubMenu(c.getInt(ixId), Menu.NONE, cnt, c.getString(ixDisplayName)).setIcon(R.drawable.attachment_dark);         }     } catch (Exception e) {         Log.e(TAG, "Error init form templates list.", e);     }      return true; } 

回答1:

Yes, there is.

The addSubMenu method returns a SubMenu object. A SubMenu is also a Menu, so you can call add on it to add items to the submenu rather than the parent menu. Your code above is creating two different submenus for Form 1 and Form 2 rather than two items within a single New Form submenu.

Example:

SubMenu submenu = menu.addSubMenu(0, Menu.NONE, 1, "New Form").setIcon(R.drawable.ic_new_form); submenu.add("Form 1").setIcon(R.drawable.attachment); 

回答2:

Adding an ActionProvider maybe it's easier. You can try as explained here

回答3:

You should consider to use an ActionProvider

example: https://gist.github.com/sibelius/7ca0b757492ff6740dec

Menu with action provider item

Code

public class MyActionProvider extends ActionProvider {      private Context mContext;      public MyActionProvider(Context context) {         super(context);          mContext = context;     }      @Override     public View onCreateActionView() {         //LayoutInflater layoutInflater = LayoutInflater.from(mContext);         return null;     }      @Override     public void onPrepareSubMenu(SubMenu subMenu) {         super.onPrepareSubMenu(subMenu);          subMenu.clear();          subMenu.add("menu 1");         subMenu.add("menu 2");         subMenu.add("menu 3");     }      @Override     public boolean hasSubMenu() {         return true;     }      @Override     public boolean onPerformDefaultAction() {         return super.onPerformDefaultAction();     } } 

文章来源: How to add submenu items to ActionBar action in code?