private void showToolbarNavigationIcon ( ) { if ( isPreferenceFragmentShown ( ) && isNavigationIconOverridden ( ) && ! isNavigationHidden ( ) && ! ( ! isSplitScreen ( ) && isButtonBarShown ( ) ) ) { displayHomeAsUp = isDisplayHomeAsUpEnabled ( ) ; ActionBar actionBar = getSupportActionBar ( ) ; if ( actionBar != null ) { actionBar . setDisplayHomeAsUpEnabled ( true ) ; } } }
Shows the navigation icon of the activity s toolbar .