In my Linux installation (with Android Studio, flutter doctor ok, no issues with flutter run or emulators in general) emu.forEach hangs waiting for Android emulators. After 3 minutes, the timeout kicks in:

$ dart tools/screenshots.dart 
Shutdown all emulators
Creating Nexus_5X emulator
Launching screenshots
Unhandled exception:
TimeoutException after 0:03:00.000000: Future not completed

I tried to switch image for Nexus_5X, with no luck:

• system-images;android-30;google_apis;x86_64
• system-images;android-30;google_apis;x86
• system-images;android-30;google_apis_playstore;x86

If i issue flutter run with the emulator running, I can use/debug the app normally. flutter devices also shows the emulator ok:

$ flutter devices
2 connected devices:

sdk gphone x86 64 arm64 (mobile) • emulator-5554 • android-x64    • Android 11 (API 30) (emulator)
Chrome (web)                     • chrome        • web-javascript • Chromium 90.0.4430.212 built on Debian 10.9, running on Debian 10.11

I tested the code of the demo project (https://github.com/tim-smart/flutter-emulators-screenshots-demo) as well, again with no luck.

Maybe related to #3

Any idea?

I'm testing out the dart_emulators package using flutter-emulators-screenshots-demo. The unmodified demo fails after 3 minutes with the following log:

$ dart tools/screenshots.dart 
Unhandled exception:
Error waiting for device: TimeoutException after 0:03:00.000000: Future not completed
#0      toFuture.<anonymous closure> (package:fpdt/task_either.dart:23:14)
#1      Left._fold (package:fpdt/either.dart:408:13)
#2      fold.<anonymous closure> (package:fpdt/either.dart:35:24)
<asynchronous suspension>
#3      Stream.asyncMap.<anonymous closure>.add (dart:async/stream.dart)
<asynchronous suspension>

Flutter doctor shows no issues:

$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.8.1, on macOS 12.1 21C52 darwin-x64, locale
    en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version
    31.0.0-rc2)
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2021.2)
[✓] IntelliJ IDEA Community Edition (version 2017.2.2)
[✓] Connected device (2 available)

• No issues found!

I am able to start Android and iOS simulators manually with no problems.

I have tried to modify the demo app to use the integration_test framework instead of the deprecated flutter_driver. The problem is that calling Emulators.build() directly crashed the test, so there is no way of making screenshots. Any ideas how to solve it?

package:test_core/src/runner/plugin/platform_helpers.dart 115:19 deserializeSuite. dart:async/zone.dart 1383:47 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/stream_impl.dart 392:13 _BufferingStreamSubscription._sendDone.sendDone dart:async/stream_impl.dart 402:7 _BufferingStreamSubscription._sendDone dart:async/stream_impl.dart 291:7 _BufferingStreamSubscription._close dart:async/stream_controller.dart 782:19 _SyncStreamControllerDispatch._sendDone dart:async/stream_controller.dart 637:7 _StreamController._closeUnchecked dart:async/stream_controller.dart 630:5 _StreamController.close package:stream_channel/src/guarantee_channel.dart 55:31 new GuaranteeChannel.. dart:async/zone.dart 1383:47 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/stream_impl.dart 392:13 _BufferingStreamSubscription._sendDone.sendDone dart:async/stream_impl.dart 402:7 _BufferingStreamSubscription._sendDone dart:async/stream_impl.dart 291:7 _BufferingStreamSubscription._close dart:async/stream_controller.dart 782:19 _SyncStreamControllerDispatch._sendDone dart:async/stream_controller.dart 637:7 _StreamController._closeUnchecked dart:async/stream_controller.dart 630:5 _StreamController.close dart:async/stream_controller.dart 874:29 _StreamSinkWrapper.close package:stream_channel/src/guarantee_channel.dart 188:38 _GuaranteeSink.close package:stream_channel/src/multi_channel.dart 241:29 _MultiChannel._closeInnerChannel dart:async/zone.dart 1383:47 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/stream_impl.dart 392:13 _BufferingStreamSubscription._sendDone.sendDone dart:async/stream_impl.dart 402:7 _BufferingStreamSubscription._sendDone dart:async/stream_impl.dart 291:7 _BufferingStreamSubscription._close dart:async/stream_controller.dart 782:19 _SyncStreamControllerDispatch._sendDone dart:async/stream_controller.dart 637:7 _StreamController._closeUnchecked dart:async/stream_controller.dart 630:5 _StreamController.close package:stream_channel/src/guarantee_channel.dart 55:31 new GuaranteeChannel.. dart:async/zone.dart 1383:47 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/stream_impl.dart 392:13 _BufferingStreamSubscription._sendDone.sendDone dart:async/stream_impl.dart 402:7 _BufferingStreamSubscription._sendDone dart:async/stream_impl.dart 534:14 _DelayedDone.perform dart:async/stream_impl.dart 620:11 _PendingEvents.handleNext dart:async/stream_impl.dart 591:7 _PendingEvents.schedule. dart:async/zone.dart 1383:47 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/zone.dart 1241:23 _CustomZone.bindCallbackGuarded. dart:async/zone.dart 1391:13 _rootRun dart:async/zone.dart 1293:19 _CustomZone.run dart:async/zone.dart 1201:7 _CustomZone.runGuarded dart:async/zone.dart 1241:23 _CustomZone.bindCallbackGuarded. dart:async/schedule_microtask.dart 40:21 _microtaskLoop dart:async/schedule_microtask.dart 49:5 _startMicrotaskLoop dart:isolate-patch/isolate_patch.dart 122:13 _runPendingImmediateCallback dart:isolate-patch/isolate_patch.dart 193:5 _RawReceivePortImpl._handleMessage

Failed to load ".../flutter-emulators-screenshots-demo-main/integration_test/main_test.dart": Connection closed before test suite loaded.

../../../.pub-cache/hosted/pub.dartlang.org/emulators-0.4.9/lib/src/device/device_state.g.dart:13:17: Error: Method not found: '$enumDecode'. platform: $enumDecode(_$DevicePlatformEnumMap, json['platform']),

Is some kind of code generation required? I tryed to run the tools.dart and got the error above :( can you help.

I couldnt find any option to start dart_emulators without he uninstalling the app; I'm in this need because some popup like notification authorization or login that pass through 2fa process really cut the integration test process and left some part for human interaction :( I really need that the screenshots to be done at the app with already logged state(resume the last state). is there some option to switch on/off the uninstall process before finishing on integration test?

Installing Android Studio and all required packages will still not be enough to make emu.toolchain.avdmanager work.

Output:

Unhandled exception:
ProcessException: No such file or directory
  Command: avdmanager create avd -n Nexus_5X -k system-images;android-31;google_apis_playstore;x86_64 -d Nexus 5X -f

It seems on MacOS after installing Android Studio $ANDROID_SDK_ROOT is not set (it's empty), but $ANDROID_HOME is set:

$ echo $ANDROID_SDK_ROOT

$ echo $ANDROID_HOME
~/Library/Android/sdk
$ $ANDROID_HOME/cmdline-tools/latest/bin/avdmanager                

Usage:
      avdmanager [global options] [action] [action options]
      Global options:
...

It would be nice if the wrapper could fallback to $ANDROID_HOME to make it work right out of the box.

This package is really cool but it wasn't working right for me so I dove into the source code and went down a rabbit hole. I ended up refactoring the package pretty heavily.

I'm not sure whether or not you'll like my changes, a lot of them are about differences of style. I got rid of a lot of the functional stuff and replaced it with OOP stuff. I like functional as much as the next guy, but it's not very readable in Dart. I think some of these are conventions in Javascript? Either way they're discouraged in Dart.

Here are some of the changes I made:

1. When things fail, fail loudly either by printing an error and skipping the current device, or by crashing the entire program.
2. Replace all functions that return functions with client classes. These kinds of functions are discouraged in Dart and severely hurt readability.
3. Remove some of the options (this ties back into 1, the options were swallowing fatal errors).
4. Replace most uses of someFuture.then(...) with await someFuture;. Usage of then outside of ultra-simple one liners is discouraged in dart.
5. Replaced import 'foo.dart' as Foo; with import 'foo.dart';. Generally, import...as in Dart is discouraged outside of some particular packages (like math.dart). Typically, packages expose logic via a class with methods so you don't pollute the namespace by importing them directly.
6. To launch the emulated app, all that devs have to do is call a single function now with some basic input: runEmulatedApp.

While doing some tests with this Flutter package, I discovered that await emu.shutdownAll(config); is not working (at least, for me), meaning that any emulator running is left in running state (no matter who started those emulators).

My system is Debian 10, emulators works as intended using Android Studio, and they show up when issuing flutter devices:

$ flutter devices
2 connected devices:

sdk gphone x86 64 arm64 (mobile) • emulator-5554 • android-x64    • Android 11 (API 30) (emulator)
Chrome (web)                     • chrome        • web-javascript • Chromium 90.0.4430.212 built on Debian 10.9, running on Debian 10.11

If possible, can you add support for setting the emulator/device orientation?

The old screenshots package did this via scripts that on Mac, which just ran the following osascript scpt. Note that it would require running the command [open -a Simulator.app] to ensure the simulator on Mac is visible to the finder before hand.

Not sure how to tackle Android, but suspect there is something you can call/do to activate the same orientation.

on run argv
  my do_submenu("Simulator", "Device", "Orientation", item 1 of argv)
  return item 1 of argv
end run

on do_submenu(app_name, menu_name, menu_item, submenu_item)
    try
        -- bring the target application to the front
        tell application app_name
            activate
        end tell
        tell application "System Events"
            tell process app_name
                tell menu bar 1
                    tell menu bar item menu_name
                        tell menu menu_name
                            tell menu item menu_item
                                tell menu menu_item
                                    click menu item submenu_item
                                end tell
                            end tell
                        end tell
                    end tell
                end tell
            end tell
        end tell
        return true
    on error error_message
        return false
    end try
end do_submenu

I really struggled for a while to figure out how to install all the needed Android SDK tools for command-line. Would help if you provided some guidance around what is needed, and how to ensure that the right system $path is setup to allow all the commands you need for the Android emulators... ie ./emulator ./avdmanager etc

Currently I'm using fvm to run flutter; is ther a plan to support fvm flutter like command? if flutter isn't the command file not found is being throwing :(