Render startup immediately and defer native work with a smooth home transition

2026-10-14 17:26:24 +08:00
parent bb7a7a2e58
commit ce21cdc10c
17 changed files with 641 additions and 144 deletions
@@ -21,78 +21,79 @@ enum SchoolConnectionState {
 }

 class SchoolSession extends ChangeNotifier {
-  SchoolSession() {
-    web = WebViewController()
-      ..setJavaScriptMode(JavaScriptMode.unrestricted)
-      ..setNavigationDelegate(
-        NavigationDelegate(
-          onNavigationRequest: (request) async {
-            final uri = Uri.tryParse(request.url);
-            final upgrade = uri == null || !request.isMainFrame
-                ? null
-                : SchoolNavigationPolicy.secureIdentityRedirect(uri);
-            if (upgrade != null) {
-              final generation = _pageGeneration;
-              try {
-                await web.loadRequest(upgrade);
-              } catch (_) {
-                if (generation == _pageGeneration) {
-                  _failure('学校身份认证暂时无法打开，请重试。');
-                }
-              }
-              return NavigationDecision.prevent;
-            }
-            if (uri == null ||
-                !SchoolNavigationPolicy.canNavigate(
-                  uri,
-                  isMainFrame: request.isMainFrame,
-                )) {
-              if (kDebugMode && request.isMainFrame) {
-                debugPrint(
-                  'Blocked school navigation origin: ${uri?.scheme}://${uri?.host}',
-                );
-              }
-              if (request.isMainFrame) _failure('学校跳转到了其他地址，请返回学校认证入口重试。');
-              return NavigationDecision.prevent;
-            }
-            return NavigationDecision.navigate;
-          },
-          onPageStarted: (_) {
-            _poll?.cancel();
-            _manualRead = false;
-            _pageGeneration++;
-            _reader.invalidate();
-            pendingDraft = null;
-            pendingExams = null;
-            if (!hasOpened || _routeClosed) return;
-            _loading = true;
-            notifyListeners();
-          },
-          onPageFinished: _loaded,
-          onWebResourceError: (error) async {
-            if (error.isForMainFrame != true || error.url == null) return;
+  SchoolSession();
+  // Creating Android WebView starts its browser engine. Do it on school access,
+  // not while the student is opening an offline timetable.
+  late final WebViewController web = _createWeb();
+  WebViewController _createWeb() => WebViewController()
+    ..setJavaScriptMode(JavaScriptMode.unrestricted)
+    ..setNavigationDelegate(
+      NavigationDelegate(
+        onNavigationRequest: (request) async {
+          final uri = Uri.tryParse(request.url);
+          final upgrade = uri == null || !request.isMainFrame
+              ? null
+              : SchoolNavigationPolicy.secureIdentityRedirect(uri);
+          if (upgrade != null) {
            final generation = _pageGeneration;
-            final current = await web.currentUrl();
-            if (hasOpened &&
-                generation == _pageGeneration &&
-                error.url == current) {
-              _failure('学校页面暂时未能加载，请检查网络后重试。');
+            try {
+              await web.loadRequest(upgrade);
+            } catch (_) {
+              if (generation == _pageGeneration) {
+                _failure('学校身份认证暂时无法打开，请重试。');
+              }
            }
-          },
-          onHttpError: (error) async {
-            final generation = _pageGeneration;
-            final current = Uri.tryParse(await web.currentUrl() ?? '');
-            if (hasOpened &&
-                generation == _pageGeneration &&
-                error.request != null &&
-                error.request!.uri == current) {
-              _failure('学校请求未完成，请稍后重试。');
+            return NavigationDecision.prevent;
+          }
+          if (uri == null ||
+              !SchoolNavigationPolicy.canNavigate(
+                uri,
+                isMainFrame: request.isMainFrame,
+              )) {
+            if (kDebugMode && request.isMainFrame) {
+              debugPrint(
+                'Blocked school navigation origin: ${uri?.scheme}://${uri?.host}',
+              );
            }
-          },
-        ),
-      );
-  }
-  late final WebViewController web;
+            if (request.isMainFrame) _failure('学校跳转到了其他地址，请返回学校认证入口重试。');
+            return NavigationDecision.prevent;
+          }
+          return NavigationDecision.navigate;
+        },
+        onPageStarted: (_) {
+          _poll?.cancel();
+          _manualRead = false;
+          _pageGeneration++;
+          _reader.invalidate();
+          pendingDraft = null;
+          pendingExams = null;
+          if (!hasOpened || _routeClosed) return;
+          _loading = true;
+          notifyListeners();
+        },
+        onPageFinished: _loaded,
+        onWebResourceError: (error) async {
+          if (error.isForMainFrame != true || error.url == null) return;
+          final generation = _pageGeneration;
+          final current = await web.currentUrl();
+          if (hasOpened &&
+              generation == _pageGeneration &&
+              error.url == current) {
+            _failure('学校页面暂时未能加载，请检查网络后重试。');
+          }
+        },
+        onHttpError: (error) async {
+          final generation = _pageGeneration;
+          final current = Uri.tryParse(await web.currentUrl() ?? '');
+          if (hasOpened &&
+              generation == _pageGeneration &&
+              error.request != null &&
+              error.request!.uri == current) {
+            _failure('学校请求未完成，请稍后重试。');
+          }
+        },
+      ),
+    );
  final _reader = SchoolReader(SchoolPageAdapter());
  final _flow = SchoolLoginFlow();
  Timer? _timeout;