android - Providing Up (aka Back) Navigation - with UI Fragments -

Google Doc tells you how the button above in an app with multiple people Display activities (by specifying "parent" activities in AndroidManifest.xml):

Although I'm working on a Bluetooth application (starts with minSdkVersion = 18 ) where single is the main activity and There are 3 pieces:

• Mainforgement. Java
• S

That's why I used the ActionBarActivity :

  MainActivity ActionBarActivity implements BleWrapperUiCallbacks {  
 and I  setDisplayHomeAsUpEnabled (true) call  method: 
 
  @Orride Bundle Saved InstantStat) {super.onCreate (savedInstanceState); RequestWindowFeature (Window.FEATURE_INDETERMINATE_PROGRESS); SetContentView (R.layout.activity_root); GetSupportActionBar () setDisplayHomeAsUpEnabled (true).  
 
 This displays  up button  in my app, but I still have 3 questions: 
 
 
  Up button  (when I'm showing the mainframe)? 
 
 How to "wire" the up button  - does it currently touch nothing? 
 
 What do I use instead of the following line in my AndroidManifest.xml? Android: Theme = "@Android: Style / Theme. Holo.NoActionBar" 
  

I can answer the second question to provide navigation by overriding this method:

  Public Boolean Onoptsim selected (menu items) {Switch (item .getItemId ()) // // Response to Home button case Android at the top of the action bar. R.DHOM: Neville. NaveetupframeSmacket (this); Back true; } Return Super.Options item selected (item); }