@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, 1, "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, 1, "客户菜单");
        menuCust.setTitle("菜单三");
        return true;
    }
    @Override
    public boolean 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.this, NextActivity.class);
            item.setIntent(intent); /* 切换到第二个Activity */
            break;
        case 101:
            Toast.makeText(MainActivity.this, "选择了菜单二", 1).show();
            break;
        case 102:
            Toast.makeText(MainActivity.this, "选择了菜单三", 1).show();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }