问菜单项不显示在操作栏上

EN

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ActionBar actionBar = getActionBar();
        actionBar.setBackgroundDrawable(new ColorDrawable(Color.BLUE));     
        actionBar.show();
    }

    @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);
        return true;
    }

}

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

    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_option1"/>
    <item
        android:id="@+id/action_settings34"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_option2"/>
    <item
        android:id="@+id/action_settings3"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_option3"/>


</menu>