Flutter Get Scroll Position Offset

In this tutorial , we will learn how to get or listen to a Scroll position change and its current position offset on Scrolling widgets like SingleChildScrollView(), ListView(). 

How to Get Current Scroll Position Offset:

ScrollController scrollController = ScrollController();

Set this controller to SingleChildScrollView() or ListView():

SingleChildScrollView( 
    controller: scrollController
)

ListView(
   controller: scrollController
)

Get Current Scroll Position Offset:

print(scrollController.offset); 
//.offset is double value
/* Outputs --------
    I/flutter (26854): 32.349831321022975
    I/flutter (26854): 33.07679332386385
    I/flutter (26854): 33.80375532670473
    I/flutter (26854): 34.530717329545666
    I/flutter (26854): 35.2576793323866
    I/flutter (26854): 35.62113813920479
    I/flutter (26854): 35.984641335227536
    I/flutter (26854): 36.34810014204572
    I/flutter (26854): 36.71160333806847
    I/flutter (26854): 37.07506214488666
    I/flutter (26854): 37.80202414772759
    I/flutter (26854): 38.16552734375034
*/ 

How to Add Scroll Position Change Listener:

ScrollController scrollController = ScrollController();

scrollController.addListener(() { //listener 
  print(scrollController.offset); 
  //.offset is double value
  /* Outputs --------
      I/flutter (26854): 35.984641335227536
      I/flutter (26854): 36.34810014204572
      I/flutter (26854): 36.71160333806847
      I/flutter (26854): 37.07506214488666
      I/flutter (26854): 37.80202414772759
      I/flutter (26854): 38.16552734375034
  */ 
});

In this way, you can fetch the current scroll position of SingleChildScrollView() or ListView() or set Scroll Position change Listener in Flutter App.

#flutter