How to go back from web view in flutter?

Question

After clicking the button it should show the web view. I did this. But when press the back button it is closing the app. It does not go back to previous state. If I press back button it should go back to previous page or state. I am getting web view from a function. Here is my code:

_contentSearch(BuildContext context){
   url = "https://www.google.com";
   return WebviewScaffold(
      url: url,
      appBar: AppBar(
        title: Text("Google"),
      ),
      withJavascript: true,
      withLocalStorage: true,
      withZoom: false,
      enableAppScheme: true,
    )
  },
 );
}

And I am calling this method like this:

 FlatButton(
        padding: EdgeInsets.all(0.0),
        onPressed: (){
          Navigator.pushReplacement(
              context,
              new MaterialPageRoute(builder: (BuildContext context) => _contentSearch(context)
              ));
        },
       child: new Text("Button"),
    ),

It's not going back. It's always closing the app.

Solution

Its because you are using pushReplacement(Replace the current route of the navigator) instead of push

Navigator.push(
        context,
        MaterialPageRoute(builder: (context) => _contentSearch(context),
      );