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WebView.destroy() called while WebView is still attached to window. Potential memory leak? #117887

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WebView.destroy() called while WebView is still attached to window. Potential memory leak?#117887
Labels
P2Important issues not at the top of the work lista: platform-viewsEmbedding Android/iOS views in Flutter appsengineflutter/engine related. See also e: labels.found in release: 3.3Found to occur in 3.3found in release: 3.7Found to occur in 3.7has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-androidAndroid applications specificallyteam-androidOwned by Android platform teamtriaged-androidTriaged by Android platform team
@davidhicks980

Description

@davidhicks980
davidhicks980
opened on Jan 3, 2023

Description

After hiding a web view, WebView.destroy() called while WebView is still attached to window is logged.

Steps to Reproduce

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: AppPage());
  }
}

class AppPage extends StatefulWidget {
  const AppPage({super.key});

  @override
  State<AppPage> createState() => _AppPageState();
}

class _AppPageState extends State<AppPage> {
  bool _showWebView = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        alignment: Alignment.center,
        children: [
          if (_showWebView) const WebviewExample(),
          Container(
            color: const Color.fromARGB(226, 255, 255, 255),
          ),
          TextButton(
            onPressed: () {
              setState(() {
                _showWebView = !_showWebView;
              });
            },
            child: const Text(
              "Show Webview",
              style: TextStyle(color: Colors.black),
            ),
          ),
        ],
      ),
    );
  }
}

class WebviewExample extends StatefulWidget {
  const WebviewExample({super.key});

  @override
  State<WebviewExample> createState() => _WebviewExampleState();
}

class _WebviewExampleState extends State<WebviewExample> {
  final controller = WebViewController.fromPlatformCreationParams(
      const PlatformWebViewControllerCreationParams());

  @override
  void initState() {
    super.initState();

    controller
      ..setNavigationDelegate(
        NavigationDelegate(
          onPageFinished: (String url) {},
        ),
      )
      ..loadRequest(Uri.parse("https://www.example.com/"));
  }

  @override
  Widget build(BuildContext context) {
    return WebViewWidget(controller: controller);
  }
}
  1. Toggle the "Show Webview" button multiple times and look at console

Logs

Logs 
  +34 ms] Syncing files to device sdk gphone64 arm64...
[        ] Compiling dart to kernel with 0 updated files
[        ] Processing bundle.
[        ] <- recompile package:bug/main.dart de4b6503-955f-4203-9010-2f89509c83a8
[        ] <- de4b6503-955f-4203-9010-2f89509c83a8
[        ] Bundle processing done.
[  +49 ms] Updating files.
[        ] DevFS: Sync finished
[        ] Syncing files to device sdk gphone64 arm64... (completed in 51ms)
[        ] Synced 0.0MB.
[        ] <- accept
[   +2 ms]



 Connected to _flutterView/0xb400007dcd0018d0.
[   +1 ms] Flutter run key commands.
[        ] r Hot reload. 🔥🔥🔥
[        ] R Hot restart.
[        ] h List all available interactive commands.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] 💪 Running with sound null safety 💪
[        ] An Observatory debugger and profiler on sdk gphone64 arm64 is available at:
           http://127.0.0.1:63233/V7HZcV8YcOI=/
[ +124 ms] The Flutter DevTools debugger and profiler on sdk gphone64 arm64 is available at:
                    http://127.0.0.1:9101?uri=http://127.0.0.1:63233/V7HZcV8YcOI=/
[+18598 ms] I/WebViewFactory( 7242): Loading com.google.android.webview version 91.0.4472.114 (code
447211484)
[   +4 ms] D/nativeloader( 7242): Configuring classloader-namespace for other apk
/data/app/~~ctsuX7JjAntmd9A-GA0A1Q==/com.google.android.trichromelibrary_447211484-P_aLjgq6UA1BWC9Mf5crpw=
=/TrichromeLibrary.apk. target_sdk_version=31, uses_libraries=ALL,
library_path=/data/app/~~SXF7BX-3hyYesN7iQ_yoVA==/com.google.android.webview-FAbofLmMthUGtgorbIQ8tQ==/lib/
arm64:/data/app/~~SXF7BX-3hyYesN7iQ_yoVA==/com.google.android.webview-FAbofLmMthUGtgorbIQ8tQ==/WebViewGoog
le.apk!/lib/arm64-v8a:/data/app/~~ctsuX7JjAntmd9A-GA0A1Q==/com.google.android.trichromelibrary_447211484-P
_aLjgq6UA1BWC9Mf5crpw==/TrichromeLibrary.apk!/lib/arm64-v8a, permitted_path=/data:/mnt/expand
[   +2 ms] D/nativeloader( 7242): Configuring classloader-namespace for other apk
/data/app/~~SXF7BX-3hyYesN7iQ_yoVA==/com.google.android.webview-FAbofLmMthUGtgorbIQ8tQ==/WebViewGoogle.apk
. target_sdk_version=31, uses_libraries=,
library_path=/data/app/~~SXF7BX-3hyYesN7iQ_yoVA==/com.google.android.webview-FAbofLmMthUGtgorbIQ8tQ==/lib/
arm64:/data/app/~~SXF7BX-3hyYesN7iQ_yoVA==/com.google.android.webview-FAbofLmMthUGtgorbIQ8tQ==/WebViewGoog
le.apk!/lib/arm64-v8a:/data/app/~~ctsuX7JjAntmd9A-GA0A1Q==/com.google.android.trichromelibrary_447211484-P
_aLjgq6UA1BWC9Mf5crpw==/TrichromeLibrary.apk!/lib/arm64-v8a, permitted_path=/data:/mnt/expand
[  +35 ms] W/com.example.bu( 7242): Accessing hidden method Landroid/os/Trace;->isTagEnabled(J)Z
(unsupported, reflection, allowed)
[        ] W/com.example.bu( 7242): Accessing hidden method
Landroid/os/Trace;->traceBegin(JLjava/lang/String;)V (unsupported, reflection, allowed)
[        ] W/com.example.bu( 7242): Accessing hidden method Landroid/os/Trace;->traceEnd(J)V (unsupported,
reflection, allowed)
[        ] W/com.example.bu( 7242): Accessing hidden method
Landroid/os/Trace;->asyncTraceBegin(JLjava/lang/String;I)V (unsupported, reflection, allowed)
[        ] W/com.example.bu( 7242): Accessing hidden method
Landroid/os/Trace;->asyncTraceEnd(JLjava/lang/String;I)V (unsupported, reflection, allowed)
[  +12 ms] I/cr_LibraryLoader( 7242): Loaded native library version number "91.0.4472.114"
[        ] I/cr_CachingUmaRecorder( 7242): Flushed 6 samples from 6 histograms.
[  +90 ms] W/chromium( 7242): [WARNING:dns_config_service_android.cc(153)] Failed to read DnsConfig.
[  +20 ms] D/CompatibilityChangeReporter( 7242): Compat change id reported: 171228096; UID 10146; state:
ENABLED
[  +14 ms] W/com.example.bu( 7242): Accessing hidden method
Landroid/media/AudioManager;->getOutputLatency(I)I (unsupported, reflection, allowed)
[   +1 ms] D/HostConnection( 7242): createUnique: call
[        ] D/HostConnection( 7242): HostConnection::get() New Host Connection established
0xb400007d2cfdd550, tid 7365
[   +1 ms] W/cr_media( 7242): Requires BLUETOOTH permission
[        ] D/HostConnection( 7242): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1
ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1
ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan
ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings
ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV_Cache
ANDROID_EMU_vulkan_ignored_handles ANDROID_EMU_has_shared_slots_host_memory_allocator
ANDROID_EMU_vulkan_free_memory_sync ANDROID_EMU_vulkan_shader_float16_int8
ANDROID_EMU_vulkan_async_queue_submit ANDROID_EMU_vulkan_queue_submit_with_commands
ANDROID_EMU_sync_buffer_data ANDROID_EMU_read_color_buffer_dma GL_OES_EGL_image_external_essl3
GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing
ANDROID_EMU_gles_max_version_3_0 
[        ] D/EGL_emulation( 7242): eglCreateContext: 0xb400007d2cfdf7d0: maj 3 min 0 rcv 3
[        ] D/EGL_emulation( 7242): eglMakeCurrent: 0xb400007d2cfdf7d0: ver 3 0 (tinfo 0x7f5f7ab280) (first
time)
[   +2 ms] I/PlatformViewsController( 7242): Hosting view in view hierarchy for platform view: 0
[   +4 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[   +5 ms] D/EGL_emulation( 7242): eglCreateContext: 0xb400007d2cfdda90: maj 3 min 0 rcv 3
[  +28 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[   +9 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +16 ms] D/EGL_emulation( 7242): eglCreateContext: 0xb400007d2cfde390: maj 3 min 0 rcv 3
[ +145 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[+1048 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[        ] D/EGL_emulation( 7242): app_time_stats: avg=313.02ms min=7.98ms max=1048.29ms count=4
[   +2 ms] D/EGL_emulation( 7242): app_time_stats: avg=5001.14ms min=6.31ms max=18792.68ms count=4
[   +3 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +11 ms] D/EGL_emulation( 7242): app_time_stats: avg=643.41ms min=1.56ms max=18440.10ms count=31
[        ] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +17 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +16 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +16 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +17 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +17 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +17 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +17 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[  +15 ms] E/FrameEvents( 7242): updateAcquireFence: Did not find frame.
[ +801 ms] D/EGL_emulation( 7242): app_time_stats: avg=50.84ms min=12.77ms max=704.11ms count=20
[  +42 ms] W/cr_AwContents( 7242): WebView.destroy() called while WebView is still attached to window.
[  +23 ms] D/EGL_emulation( 7242): app_time_stats: avg=58.04ms min=3.70ms max=853.02ms count=16
[+121662 ms] Application finished.

(base) bug flutter analyze
Analyzing bug...                                                        
No issues found! (ran in 1.6s)

(base) bug flutter doctor -v
[✓] Flutter (Channel stable, 3.3.10, on macOS 12.2.1 21D62 darwin-arm, locale en-US)
    • Flutter version 3.3.10 on channel stable at /Users/davidhicks/Development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 135454af32 (3 weeks ago), 2022-12-15 07:36:55 -0800
    • Engine revision 3316dd8728
    • Dart version 2.18.6
    • DevTools version 2.15.0

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/davidhicks/Library/Android/sdk
    • Platform android-33, build-tools 33.0.0
    • ANDROID_HOME = /Users/davidhicks/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.4.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 13F100
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)

[✓] VS Code (version 1.73.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.57.20221221

[✓] Connected device (3 available)
    • sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64  • Android 12 (API 31) (emulator)
    • macOS (desktop)             • macos         • darwin-arm64   • macOS 12.2.1 21D62 darwin-arm
    • Chrome (web)                • chrome        • web-javascript • Google Chrome 108.0.5359.124

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!
Screen.Recording.2023-01-03.at.1.42.19.AM.mov

I have limited knowledge of Android, but it appears others on the web have pointed to this causing memory leaks in their applications. I'm not sure of the validity of this claim, but I wanted to bring it to your attention regardless. Thanks!

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    P2Important issues not at the top of the work lista: platform-viewsEmbedding Android/iOS views in Flutter appsengineflutter/engine related. See also e: labels.found in release: 3.3Found to occur in 3.3found in release: 3.7Found to occur in 3.7has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-androidAndroid applications specificallyteam-androidOwned by Android platform teamtriaged-androidTriaged by Android platform team

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