I want to add buttons in Actionbar of Android Support library.
Actionbar is shown, but no button appears.

Below is res/menu/main.xml

```
menu xmlns:android="http://schemas.android.com/apk/res/android" >

<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:showAsAction="always"
    android:icon="@android:drawable/ic_menu_preferences"
    android:title="@string/action_settings"/>

</menu>

```

and I add following code.

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

    return true;
}

```

What should I do??