利用xml文件创建Menu

menu.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_settings"
          android:icon="@+drawable/ic_menu_preferences"
          android:showAsAction="ifRoom"
          android:title="@+string/menu_settings" />
</menu>

代码中引用该xml文件：
@Override
    public boolean onCreateOptionsMenu(Menu menu) {          

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.options, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_settings:
                Intent intent = new Intent(Settings.ACTION_NFCSHARING_SETTINGS);
                startActivity(intent);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }