Android 菜单 Menu

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main,menu);

        MenuItem menuSys = menu.add(1001,100,1,"系統菜单");
        menuSys.setTitle("菜单一"); /* 最多可以显示6个子菜单 */

        MenuItem menuUser = menu.add(1001,101,"用户菜单");
        menuUser.setTitle("菜单二");
        menuUser.setShortcut('c','c');  给菜单设置快捷键 

        MenuItem menuCust = menu.add(1001,102,"客户菜单");
        menuCust.setTitle("菜单三");

        return true;
    }

    @Override
     onOptionsItemSelected(MenuItem item) {
         TODO Auto-generated method stub
        switch (item.getItemId()) {
        case 100:
            Toast.makeText(MainActivity.this,"选择了菜单一",1).show();
            Intent intent = new Intent(MainActivity.class);
            item.setIntent(intent);  切换到第二个Activity */
            break;
        case 101).show();
            case 102default:
            ;
        }

        super.onOptionsItemSelected(item);
    }