[android] How to hide action bar before activity is created, and then show it again?

Try this, it works for me:

Below gets rid of activity's title bar

 requestWindowFeature(Window.FEATURE_NO_TITLE);

Below eliminates the notification bar to make the activity go full-screen

 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

(Full Example Below) Take note: These methods were called before we set the content view of our activity

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Sets Application to full screen by removing action bar
        requestWindowFeature(Window.FEATURE_NO_TITLE);    
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main); 

        // without this check, we would create a new fragment at each orientation change!
        if (null == savedInstanceState)
            createFragment();
    }

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