1-) FLUTTER - Webview ileri ve geri button ile ve inappwebview

android için dosya yükleme kaynağı inappwebview : https://pub.dev/packages/flutter_inappwebview/versions/5.0.0-nullsafety.0

dosya indirme vs için : https://www.roketnot.com/not/1581-dio-ile-pdf-indirme-ve-openfile-ile-goruntuleme-download

1-) pubspec.yaml

 webview_flutter: ^3.0.0

  url_launcher: ^6.0.18

  flutter_inappwebview: ^5.3.2

2-) kodlar(ios ise geri ileri buttonu vardır)

3-) DİĞER

onLoadStop: (controller, url) async {
  pullToRefreshController.endRefreshing();

  if (url != null) {
    await updateCookies(url);
  }

  setState(() {
    this.url = url.toString();
  });
},

final cookieManager = WebviewCookieManager();
String sessionId="";
String sessionKey="PHPSESSID";
String cookiesString = '';
String url = "";

Future<void> updateCookies(Uri url) async {

  final gotCookies = await cookieManager.getCookies(url.toString());
  cookiesString = '';

  for (var cookie in gotCookies) {
    cookiesString += '${cookie.name}=${cookie.value};';

    if(cookie.name=="PHPSESSID"){
      sessionId=cookie.value;
    }
  }
  print("--> "+cookiesString);
}

PATH İÇİN

Future<String?> getDownloadPath() async {

    Directory? directory;

    try {

      if (Platform.isIOS) {

        directory = await getApplicationDocumentsDirectory();

    } else {

        directory = Directory('/storage/emulated/0/Download');

        // Put file in global download folder, if for an unknown reason it didn't exist, we fallback

        // ignore: avoid_slow_async_io

        if (!await directory.exists()) directory = await getExternalStorageDirectory();

}

    } catch (err, stack) {

    print("Cannot get download folder path");

}

return directory?.path;

}

inappwebview pdf download terminal -> flutter pub add flutter_downloader

İNİTİALİZİNG

 void callback(String id ,DownloadTaskStatus status,int progress){}

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await FlutterDownloader.initialize(debug: true, ignoreSsl: true); // , ignoreSsl: true
  FlutterDownloader.registerCallback(callback);

  runApp(const MyApp());}

DOWNLOADİNG

onDownloadStart: (
  controller,
  url,
) async {
  try {
    String? dosyaYolu = await getDownloadPath();

    await FlutterDownloader.enqueue(
        url: url.toString(),
        showNotification: true,
        openFileFromNotification: true,
        // savedDir: (await getExternalStorageDirectory())!.path // getApplicationDocumentsDirectory
        // savedDir: "/storage/emulated/0/Download"
        savedDir: dosyaYolu.toString());
  } catch (Ex) {}
},

inappwebview pullToRefreshController

late PullToRefreshController pullToRefreshController;

@override
  void initState() {
// TODO: implement initState
    super.initState();
    pullToRefreshController = PullToRefreshController(
      options: PullToRefreshOptions(
        color: Colors.blue,
      ),
      onRefresh: () async {
        if (Platform.isAndroid) {
          webViewControllerIn?.reload();

          ScaffoldMessenger.of(context).showSnackBar(SnackBar(
              content: Text("Pagina vernieuwd"),
              duration: Duration(milliseconds: 300)));
          pullToRefreshController.endRefreshing();
        } else if (Platform.isIOS) {
          webViewControllerIn?.loadUrl(
              urlRequest: URLRequest(url: await webViewControllerIn?.getUrl()));
          pullToRefreshController.endRefreshing();
        }
      },
    );
  }

pullToRefreshController: pullToRefreshController,

TAM KOD

return WillPopScope(
    onWillPop: _onBackIn,
    child: Scaffold(
      appBar: null,
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          StatikSinif.urlTemizle().then((value) {
            Navigator.of(context).pushAndRemoveUntil(
                MaterialPageRoute(builder: (context) => MyApp()),
                (r) => false);
          });
        },
        tooltip: 'Logout',
        child: Icon(Icons.logout),
      ),
      floatingActionButtonLocation:
          FloatingActionButtonLocation.startFloat,
      body: SafeArea(
        child: Container(
          child: InAppWebView(
            initialUrlRequest:
                URLRequest(url: Uri(path: StatikSinif.webSite)),
            initialOptions: InAppWebViewGroupOptions(
              crossPlatform: InAppWebViewOptions(
                mediaPlaybackRequiresUserGesture: false,
                useOnDownloadStart: true,
                useShouldOverrideUrlLoading: true,
                javaScriptCanOpenWindowsAutomatically: true,
                javaScriptEnabled: true,
                preferredContentMode: UserPreferredContentMode.MOBILE,
              ),
              android: AndroidInAppWebViewOptions(
                useShouldInterceptRequest: true,
                useHybridComposition: true,
              ),
            ),
            onWebViewCreated: (InAppWebViewController controller) {
              webViewControllerIn = controller;
            },
            androidOnPermissionRequest:
                (InAppWebViewController controller, String origin,
                    List<String> resources) async {
              return PermissionRequestResponse(
                resources: resources,
                action: PermissionRequestResponseAction.GRANT,
              );
            },
            onDownloadStart: (
              controller,
              url,
            ) async {
              try {
                String? dosyaYolu = await getDownloadPath();

                await FlutterDownloader.enqueue(
                    url: url.toString(),
                    showNotification: true,
                    openFileFromNotification: true,
                    // savedDir: (await getExternalStorageDirectory())!.path // getApplicationDocumentsDirectory
                    // savedDir: "/storage/emulated/0/Download"
                    savedDir: dosyaYolu.toString());
              } catch (Ex) {}
            },
            pullToRefreshController: pullToRefreshController,
          ),
        ),
      ),
    ));

5. AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

 <provider
        android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
        android:authorities="${applicationId}.flutter_downloader.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>

<provider
    android:name="com.pichillilorenzo.flutter_inappwebview.InAppWebViewFileProvider"
    android:authorities="${applicationId}.flutter_inappwebview.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths" />
</provider>

</application>

6. Android->app->src->main->res->xml->provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="external_files"
        path="." />
    <external-files-path
        name="external_files"
        path="." />
    <cache-path
        name="cache"
        path="." />
    <external-cache-path
        name="external_cache"
        path="." />
    <files-path
        name="files"
        path="." />


</paths>

SON NOT ANDROİD İÇİN BUNU KULLAN savedDir: (await getExternalStorageDirectory())!.path);

İOS İÇİN BUNU KULLAN directory = await getApplicationDocumentsDirectory();