[camera_android_camerax] takePicture creates a single-thread executor per capture that is never shut down

What package does this bug report belong to?

camera

What target platforms are you seeing this bug on?

Android

Have you already upgraded your packages?

Yes

Dependency versions

The example depends on the plugin by path, so the version below is the working tree rather than a published one. The code this report is about is unchanged in 0.7.4+3 on pub.dev and on main.

pubspec.lock

# Generated by pub
# See https://dart.dev/tools/pub/glossary#lockfile
packages:
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    dependency: transitive
    description:
      name: async
      sha256: e2eb0491ba5ddb6177742d2da23904574082139b07c1e33b8503b9f46f3e1a37
      url: "https://pub.dev"
    source: hosted
    version: "2.13.1"
  boolean_selector:
    dependency: transitive
    description:
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      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.2"
  camera_android_camerax:
    dependency: "direct main"
    description:
      path: ".."
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    source: path
    version: "0.7.4+4"
  camera_platform_interface:
    dependency: "direct main"
    description:
      name: camera_platform_interface
      sha256: "4524ca6eb4176b066864036ad4fe02c3e4863e63b77eadc21a5bf56824f43498"
      url: "https://pub.dev"
    source: hosted
    version: "2.13.1"
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    description:
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      sha256: faf38497bda5ead2a8c7615f4f7939df04333478bf32e4173fcb06d428b5716b
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    source: hosted
    version: "1.4.1"
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    version: "1.1.2"
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      url: "https://pub.dev"
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    version: "1.0.2"
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    description:
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      url: "https://pub.dev"
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    version: "0.4.0+25"
  fake_async:
    dependency: transitive
    description:
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      sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"
      url: "https://pub.dev"
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    version: "1.3.3"
  file:
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      url: "https://pub.dev"
    source: hosted
    version: "7.0.1"
  flutter:
    dependency: "direct main"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_driver:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_test:
    dependency: "direct dev"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_web_plugins:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  fuchsia_remote_debug_protocol:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  html:
    dependency: transitive
    description:
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      sha256: "6d1264f2dffa1b1101c25a91dff0dc2daee4c18e87cd8538729773c073dbf602"
      url: "https://pub.dev"
    source: hosted
    version: "0.15.6"
  integration_test:
    dependency: "direct dev"
    description: flutter
    source: sdk
    version: "0.0.0"
  leak_tracker:
    dependency: transitive
    description:
      name: leak_tracker
      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
      url: "https://pub.dev"
    source: hosted
    version: "11.0.2"
  leak_tracker_flutter_testing:
    dependency: transitive
    description:
      name: leak_tracker_flutter_testing
      sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"
      url: "https://pub.dev"
    source: hosted
    version: "3.0.10"
  leak_tracker_testing:
    dependency: transitive
    description:
      name: leak_tracker_testing
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      url: "https://pub.dev"
    source: hosted
    version: "3.0.2"
  matcher:
    dependency: transitive
    description:
      name: matcher
      sha256: dc0b7dc7651697ea4ff3e69ef44b0407ea32c487a39fff6a4004fa585e901861
      url: "https://pub.dev"
    source: hosted
    version: "0.12.19"
  material_color_utilities:
    dependency: transitive
    description:
      name: material_color_utilities
      sha256: "9c337007e82b1889149c82ed242ed1cb24a66044e30979c44912381e9be4c48b"
      url: "https://pub.dev"
    source: hosted
    version: "0.13.0"
  meta:
    dependency: transitive
    description:
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      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
      url: "https://pub.dev"
    source: hosted
    version: "1.18.0"
  path:
    dependency: transitive
    description:
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      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
      url: "https://pub.dev"
    source: hosted
    version: "1.9.1"
  platform:
    dependency: transitive
    description:
      name: platform
      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
      url: "https://pub.dev"
    source: hosted
    version: "3.1.6"
  plugin_platform_interface:
    dependency: transitive
    description:
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      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.8"
  process:
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    description:
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      sha256: c6248e4526673988586e8c00bb22a49210c258dc91df5227d5da9748ecf79744
      url: "https://pub.dev"
    source: hosted
    version: "5.0.5"
  sky_engine:
    dependency: transitive
    description: flutter
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  source_span:
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      url: "https://pub.dev"
    source: hosted
    version: "1.10.2"
  stack_trace:
    dependency: transitive
    description:
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      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
      url: "https://pub.dev"
    source: hosted
    version: "1.12.1"
  stream_channel:
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    description:
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      url: "https://pub.dev"
    source: hosted
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  stream_transform:
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      url: "https://pub.dev"
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  string_scanner:
    dependency: transitive
    description:
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      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
      url: "https://pub.dev"
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  sync_http:
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    description:
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      url: "https://pub.dev"
    source: hosted
    version: "0.3.1"
  term_glyph:
    dependency: transitive
    description:
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      url: "https://pub.dev"
    source: hosted
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  vector_math:
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    description:
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      url: "https://pub.dev"
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  video_player:
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    description:
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    source: hosted
    version: "2.13.0"
  video_player_android:
    dependency: transitive
    description:
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      sha256: e229676f8fade3e0124482495aaa2b548872cc4018b6268adfca4868be16aa74
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    version: "2.12.0"
  video_player_avfoundation:
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    version: "2.11.0"
  video_player_platform_interface:
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    version: "6.9.0"
  video_player_web:
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      url: "https://pub.dev"
    source: hosted
    version: "2.4.0"
  vm_service:
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    description:
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      sha256: "0016aef94fc66495ac78af5859181e3f3bf2026bd8eecc72b9565601e19ab360"
      url: "https://pub.dev"
    source: hosted
    version: "15.2.0"
  web:
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    description:
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      url: "https://pub.dev"
    source: hosted
    version: "1.1.1"
  webdriver:
    dependency: transitive
    description:
      name: webdriver
      sha256: "2f3a14ca026957870cfd9c635b83507e0e51d8091568e90129fbf805aba7cade"
      url: "https://pub.dev"
    source: hosted
    version: "3.1.0"
sdks:
  dart: ">=3.12.0 <4.0.0"
  flutter: ">=3.44.0"

Steps to reproduce

Run the camera_android_camerax example on an Android device.
Take a photo.
Inspect the app's threads, e.g. in the Android Studio profiler or with adb shell ps -T -p $(adb shell pidof io.flutter.plugins.cameraxexample), and look for a pool-*-thread-* entry that outlives the capture.

Expected results

Taking a photo does not create a thread that the plugin never shuts down.

Actual results

Every capture creates one, by allocating its own executor:

https://github.com/flutter/packages/blob/3498b9d7b67143a68dc43b90951acb577e92f64e/packages/camera/camera_android_camerax/android/src/main/java/io/flutter/plugins/camerax/ImageCaptureProxyApi.java#L108-L109

Executors.newSingleThreadExecutor() returns a ThreadPoolExecutor whose core thread does not time out, wrapped in a FinalizableDelegatedExecutorService whose finalize() is the only thing that shuts it down. Since the plugin never calls shutdown(), that thread is reclaimed at a time the plugin does not control.

The executor is not doing the capture work. In camera-core 1.6.1, ProcessingNode.saveJpegToDisk runs on mBlockingExecutor, which comes from ImageCaptureConfig.getIoExecutor(CameraXExecutors.ioExecutor()) — the plugin never calls setIoExecutor, so encoding and file I/O happen on CameraX's own IO executor. TakePictureRequest.onResult then does nothing but getAppExecutor().execute(...). The executor passed to takePicture therefore only delivers an already finished result, and the plugin's callback body only forwards the file path to Dart.

Every other CameraX callback in this plugin is dispatched with ContextCompat.getMainExecutor(...) — CameraControlProxyApi, Camera2CameraControlProxyApi, ImageAnalysisProxyApi, ProcessCameraProviderProxyApi and PendingRecordingProxyApi, nine call sites in total. ImageCaptureProxyApi is the exception, and I could not find a reason for it in the code.

PreviewProxyApi.createSurfaceProvider uses the same pattern when calling SurfaceRequest.provideSurface, once per surface request rather than once per capture. That one seems worth a separate look, since its callback releases a Surface.

I can open a PR for the ImageCaptureProxyApi case.

Code sample

Reproducible with the camera_android_camerax example; a single takePicture() is enough.

await controller.initialize();
await controller.takePicture();

Screenshots or Videos

Logs

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.44.1, on macOS 26.5.1 25F80 darwin-arm64, locale ko-KR) [460ms]
    • Flutter version 3.44.1 on channel stable at /Users/paul/projects/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 924134a44c (10 weeks ago), 2026-05-29 12:13:22 -0400
    • Engine revision c416acfeb8
    • Dart version 3.12.1
    • DevTools version 2.57.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets, no-enable-swift-package-manager, omit-legacy-version-file, enable-lldb-debugging, enable-uiscene-migration

[✓] Android toolchain - develop for Android devices (Android SDK version 37.0.0) [2.6s]
    • Android SDK at /Users/paul/Library/Android/sdk
    • Emulator version 35.3.11.0 (build_id 12836668) (CL:N/A)
    • Platform android-37.0, build-tools 37.0.0
    • ANDROID_HOME = /Users/paul/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 26.2) [1,568ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 17C52
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [11ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Connected device (3 available) [7.2s]
    • 신바울의 iPhone (mobile) • 00008110-0018254A3686401E • ios            • iOS 26.5.2 23F84
    • macOS (desktop)      • macos                     • darwin-arm64   • macOS 26.5.1 25F80 darwin-arm64
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 150.0.7871.187

[✓] Network resources [662ms]
    • All expected network resources are available.

• No issues found!

@toyaji

Hi @toyaji , thanks for the report and for raising a PR.
Routing to the Android team with fyi-ecosystem for evaluation.

[camera_android_camerax] Fix leaked thread per capture in `takePicture`

[camera_android_camerax] Fix leaked thread per capture in `takePictur…

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[camera_android_camerax] takePicture creates a single-thread executor per capture that is never shut down #190523

What package does this bug report belong to?

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[camera_android_camerax] takePicture creates a single-thread executor per capture that is never shut down #190523

Description

What package does this bug report belong to?

What target platforms are you seeing this bug on?

Have you already upgraded your packages?

Dependency versions

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Videos

Logs

Flutter Doctor output

Activity

mbcorona commented on Aug 4, 2026

github-actions commented on Aug 26, 2026

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