Adding the ActionBar

Developer site:
http://developer.android.com/intl/ja/guide/topics/ui/actionbar.html

Adding the Action Bar

Beginning with Android 3.0 (API level 11), the action bar is included in all activitie.
If yuu want to use Action Bar, you should add android:targetSdkVersion="11" in AndroidManifest.xml.

<manifest ...="">
    <uses-sdk android:minsdkversion="8" android:targetsdkversion="11">
</uses-sdk>
</manifest>