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Most of the steps of Fastlane Android Screengrab work as intended: building my app in debug with the given environment parameter, building the Android tests, running the Android tests in the emulator, and storing the screenshots on the device (see logcat output below) however when Fastlane attempts to pull the screenshots from the emulator it stops polling locations after a "permission denied" error.

[20:55:07]: Pulling captured screenshots from the device
ls: /sdcard/io.outright.my_flutter_app/screengrab: No such file or directory
[20:55:07]: Exit status: 1
ls: /data/data/io.outright.my_flutter_app/app_screengrab: Permission denied
[20:55:07]: Exit status: 1
[20:55:07]: Make sure you've used Screengrab.screenshot() in your tests and that your expected tests are being run.

I have confirmed that I am using Screengrab.screenshot() in my tests and my expected tests are being run. This is from logcat of the emulator while the test ran:

... Screengrab    io.outright.my_flutter_app      D  Using screenshot storage directory: /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots
... Screengrab    io.outright.my_flutter_app      D  Captured screenshot "0_StartScreen.png"
... Screengrab    io.outright.my_flutter_app      D  Using screenshot storage directory: /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots
... Screengrab    io.outright.my_flutter_app      D  Captured screenshot "1_SetupScreen.png"
... Screengrab    io.outright.my_flutter_app      D  Using screenshot storage directory: /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots
... Screengrab    io.outright.my_flutter_app      D  Captured screenshot "2_GameScreen.png"
... Screengrab    io.outright.my_flutter_app      D  Using screenshot storage directory: /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots

Attempt to see these files with adb shows the same permission error:

$ adb shell ls /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots

ls: /data/user/0/io.outright.my_flutter_app/app_screengrab/en_US/images/screenshots: Permission denied

There used to be a use_adb_root parameter for Fastlane but it is now deprecated and does not work in any version since 2.0

Environment

  • macOS Sonoma 14.7.1
  • Chip Apple M1 Pro
  • Fastlane 2.225.0
  • Fastlane installed and run with ruby 3.2.2 and Bundler 2.5.22
  • Android Emulator running Pixel 6a API 34 with UpsideDownCake Android 14.0 arm64-v8a

Screengrabfile

app_package_name('io.outright.my_flutter_app')
use_tests_in_packages(['io.outright.my_flutter_app'])
tests_package_name('io.outright.my_flutter_app.test')

app_apk_path('../build/app/outputs/apk/debug/app-debug.apk')
tests_apk_path('../build/app/outputs/apk/androidTest/debug/app-debug-androidTest.apk')

test_instrumentation_runner 'androidx.test.runner.AndroidJUnitRunner'

locales(['en-US'])

clear_previous_screenshots(true)

Fastfile

default_platform(:android)

platform :android do

  desc "Capture screenshots"
  lane :screenshots do
    sh("flutter", "build", "apk", "--debug")
    build_android_app(
      task: 'assemble',
      build_type: 'AndroidTest'
    )
    capture_android_screenshots
  end

end

app/build.gradle

...

dependencies {
    testImplementation 'junit:junit:4.13.2'

    androidTestImplementation 'tools.fastlane:screengrab:2.1.1'
    androidTestImplementation 'androidx.test:runner:1.5.2'
    androidTestImplementation 'androidx.test:rules:1.5.0'
    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
    androidTestImplementation "androidx.test.uiautomator:uiautomator:2.2.0"
}

Logs

$ bundle exec fastlane screenshots                                                                                                                                                 

[✔] 

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                Flutter Android Fastlane Permission denied pulling captured screenshots from the emulatorStack Overflow

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