添加子菜单

import android.app.Activity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.Menu;

import android.view.MenuItem;

import android.view.SubMenu;

import android.widget.Toast;

/**

* Class which shows how to work with Submenus

*

* @author FaYnaSoft Labs

*/

public class Main extends Activity {

private static final int FILE = 0;

private static final int EDIT = 1;

private static final int NEW_MENU_ITEM = Menu.FIRST;

private static final int SAVE_MENU_ITEM = NEW_MENU_ITEM + 1;

private static final int UNDO_MENU_ITEM = SAVE_MENU_ITEM + 1;

private static final int REDO_MENU_ITEM = UNDO_MENU_ITEM + 1;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

SubMenu fileMenu = menu.addSubMenu("File");

SubMenu editMenu = menu.addSubMenu("Edit");

fileMenu.add(FILE, NEW_MENU_ITEM, 0, "new");

fileMenu.add(FILE, SAVE_MENU_ITEM, 1, "save");

editMenu.add(EDIT, UNDO_MENU_ITEM, 0, "undo");

editMenu.add(EDIT, REDO_MENU_ITEM, 1, "redo");

return super.onCreateOptionsMenu(menu);

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case NEW_MENU_ITEM:

showMsg("New");

break;

case SAVE_MENU_ITEM:

showMsg("Save");

break;

case UNDO_MENU_ITEM:

showMsg("Undo");

break;

case REDO_MENU_ITEM:

showMsg("Redo");

break;

}

return super.onOptionsItemSelected(item);

}

private void showMsg(String message) {

Toast msg = Toast.makeText(Main.this, message, Toast.LENGTH_LONG);

msg.setGravity(Gravity.CENTER, msg.getXOffset() / 2,

msg.getYOffset() / 2);

msg.show();

}

}

menu.add(0, ADD_MENU_ITEM, 0, "Add").setIcon(android.R.drawable.ic_menu_add);

menu.add(0, NEW_MENU_ITEM, 0, "New").setAlphabeticShortcut('N');