How to write a double back button pressed to exit app using flutter

Question

I\'m new to flutter, and I saw many android apps can exit when double press back button.

The first time press back button, app shows a toast\"press again to exit app

Answer 1

This is my solution, you can change backPressTotal value to the number of pressed you want!

int backPressCounter = 0;
int backPressTotal = 2;

@override
Widget build(BuildContext context) {
  return Scaffold(
    ...
    body: WillPopScope(child: getBody(), onWillPop: onWillPop),
  );
}

Future onWillPop() {
    if (backPressCounter < 2) {
      Fluttertoast.showToast(msg: "Press ${backPressTotal - backPressCounter} time to exit app");
      backPressCounter++;
      Future.delayed(Duration(seconds: 1, milliseconds: 500), () {
        backPressCounter--;
      });
      return Future.value(false);
    } else {
      return Future.value(true);
    }
}