flutter inAppWebview：响应点击 pdf link

Question

我正在尝试在 flutter 中使用 InAppWebview 插件，效果很好，但是当我点击 pdf 时 link 它什么也没做。

尝试点击 google 搜索中的第一个或第二个 link。

或shouldOverrideUrlLoading或onDownloadStart

关于如何显示或如何拦截它有什么想法吗？

    class WebViewWidget extends StatefulWidget {
      final String url;
    
      WebViewWidget(this.url);
    
      @override
      _WebViewWidgetState createState() => _WebViewWidgetState();
    }
    
    class _WebViewWidgetState extends State<WebViewWidget> {
      final Completer<InAppWebViewController> _controller =
          Completer<InAppWebViewController>();
    
      final InAppWebViewGroupOptions _options = InAppWebViewGroupOptions(
        crossPlatform: InAppWebViewOptions(
          useShouldOverrideUrlLoading: true,
          mediaPlaybackRequiresUserGesture: false,
          javaScriptEnabled: true,
        ),
        android: AndroidInAppWebViewOptions(
          useHybridComposition: true,
          loadWithOverviewMode: true,
          useWideViewPort: false,
          builtInZoomControls: false,
          domStorageEnabled: true,
          supportMultipleWindows: true,
        ),
      );
    
      @override
      Widget build(BuildContext context) {
        return Scaffold(
          body: Builder(builder: (BuildContext context) {
            return InAppWebView(
                initialUrlRequest: URLRequest(url: Uri.parse("https://www.google.com/search?client=firefox-b-d&q=pdf+example")),
                initialOptions: _options,
                shouldOverrideUrlLoading: (controller, action) {
                  print("override");
                  return Future.value(NavigationActionPolicy.ALLOW);
                },
                onWebViewCreated: (webViewController) {
                  _controller.complete(webViewController);
                },
                onDownloadStart: (controller, uri) {
                  print("download");
                },
             );
          }),
        );
      }
    }

Answer 1

要调用onDownloadStart必须在crossPlatform: InAppWebViewOptions()上设置useOnDownloadStart: true。一旦完成，回调就会被正确调用。