what is the equivalent method of onbackpressed in flutter

Question

I want the same onBackPressed logic of Android in flutter application and I want to close the app when I click on phone back button.

Can any one tell me how to do this when we click on phone back not app back button.

android:

@Override
public void onBackPressed()
{
     // code here to show dialog
     super.onBackPressed();  // optional depending on your needs
}

Answer 1

You can use WillPopScope for that. It's a class that notifies you when the enclosing ModalRoute (internally used with the Navigator) is about to be popped. It even leaves you a choice to whether or not you want the pop to happen.

Just wrap the second screen's Scaffold in a WillPopScope.

return WillPopScope(
  onWillPop: () async {
    // You can do some work here.
    // Returning true allows the pop to happen, returning false prevents it.
    return true;
  },
  child: ... // Your Scaffold goes here.
);