developer.android.com/training/implementing-naviga...@Override
public void onCreate(Bundle savedInstanceState) {
...
getActionBar().setDisplayHomeAsUpEnabled(true);
}
или
developer.android.com/reference/android/R.attr.htm...<style name="ActionBarStyle">
...
<item name="android:displayOptions">showTitle|homeAsUp</item>
<item name="displayOptions">showTitle|homeAsUp</item>
</style>
<style name="Theme.UpTheme" parent="Theme.Holo">
...
<item name="android:actionBarStyle">@style/ActionBarStyle</item>
</style>
<activity
....
android:theme="@style/Theme.UpTheme"/>
