Drawer Navigation 一啟動, 預設點擊某 item
===

//region 抽屜監聽器
private NavigationView.OnNavigationItemSelectedListener navListener = new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {

        item.setChecked(true);
        drawerLayout.closeDrawers();

        logger.debug(String.valueOf(item));

        Fragment fragment;
        switch (item.getItemId()) {
            /** 首頁 */
            case R.id.nav_home:
                invalidateOptionsMenu();    // 觸發 onPrepareOptionsMenu 重新繪製 Options Menu

                fragment = new HomeFragment();
                switchFragment(fragment);
                setTitle("首頁");
                break;

            /** 設定 */
            case R.id.nav_setting:
                invalidateOptionsMenu();    // 觸發 onPrepareOptionsMenu 重新繪製 Options Menu

                fragment = new SettingFragment();
                switchFragment(fragment);
                setTitle("設定");
                break;

            /** 其他 */
            case R.id.nav_appSetting:
                invalidateOptionsMenu();    // 觸發 onPrepareOptionsMenu 重新繪製 Options Menu

                fragment = new OtherFragment();
                switchFragment(fragment);
                setTitle("其他");
                break;
        }

        return true;
    }
};

...

// 取得 menu 佈局檔的特定 item id
MenuItem homeItem = navigationView.getMenu().findItem(R.id.nav_home);
navListener.onNavigationItemSelected(homeItem);

## Ref.
[Navigation drawer: How do I set the selected item at startup?](https://stackoverflow.com/questions/31233279/navigation-drawer-how-do-i-set-the-selected-item-at-startup)

###### tags: `Drawer Navigation View`