flutter_tracker/lib/pages/home_page.dart

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

class HomePage extends StatefulWidget {
  String url;

  HomePage({Key key, this.url}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  bool _isLoading = true;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        WebView(
          initialUrl: widget.url,
          javascriptMode: JavascriptMode.unrestricted,
          onWebViewCreated: (WebViewController web) {
            web.canGoBack().then((res) {
//                print(res); // 是否能返回上一级
            });
            web.currentUrl().then((url) {
//                print(url); // 返回当前url
            });
            web.canGoForward().then((res) {
//                print(res); //是否能前进
            });
          },
          onPageFinished: (String value) {
            // 返回当前url
//              print(value);
            setState(() {
              _isLoading = false;
            });
          },
        ),
        _loading()
      ],
    );
  }

  _loading() {
    return _isLoading == true
        ? Container(
            decoration: const BoxDecoration(color: Colors.white),
            child: const Center(
              child: CircularProgressIndicator(),
            ),
          )
        : const Text('');
  }
}