bug: Always stop ( ● ) Packaging Python app...

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Describe the bug

       You may need to restart any open editors for them to read new settings.
       JDK installed ✅                                                                                                                             
       Android SDK installation found at C:\Users\Administrator\AppData\Local\Android\Sdk
       Android SDK package "cmdline-tools;latest" is already installed
       Android SDK package "platform-tools" is already installed
       Android SDK package "platforms;android-35" is already installed
       Android SDK package "build-tools;34.0.0" is already installed
       Android SDK installed ✅

[20:00:25] Created app shell ✅
Run subprocess: ['C:\Users\Administrator\flutter\3.38.3\bin\dart.BAT', 'run', '--suppress-analytics', 'serious_python:main', 'package',
'C:\Users\Administrator\Desktop\learn\my-app\src', '--platform', 'Android', '-r', 'android-notify>=1.60.6', '-r', 'flet>=0.80.1',
'--exclude', 'build', '--cleanup-packages']
( ● ) Packaging Python app...

Code sample

a

To reproduce

a

Expected behavior

No response

Screenshots / Videos

Captures

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Operating System

Windows

Operating system details

11

Flet version

0.80.1

Regression

Yes, it used to work in a previous Flet version (please specify the version in additional details)

Suggestions

No response

Logs

[Paste your logs here]

Additional details

No response

Can you share a more verbose output using -vv flag?

Can you share a more verbose output using -vv flag?你能用 -vv 标志分享一个更详细的输出吗？

(my-app) PS C:\Users\Administrator\Desktop\learn\my-app> flet build apk -vv
[21:50:57] Run subprocess: ['C:\Users\Administrator\flutter\3.38.3\bin\flutter.BAT', '--version', '--no-version-check', '--suppress-analytics']
[21:50:58] Flutter executable: C:\Users\Administrator\flutter\3.38.3\bin\flutter.BAT
Dart executable: C:\Users\Administrator\flutter\3.38.3\bin\dart.BAT
JDK installed at C:\Users\Administrator\java\17.0.13+11
Configuring Flutter's path to JDK
Run subprocess: ['C:\Users\Administrator\flutter\3.38.3\bin\flutter.BAT', 'config', '--no-version-check', '--suppress-analytics',
'--jdk-dir=C:\Users\Administrator\java\17.0.13+11']
[21:50:59] Setting "jdk-dir" value to "C:\Users\Administrator\java\17.0.13+11".

       You may need to restart any open editors for them to read new settings.
       JDK installed ✅                                                                                                                             
       Android SDK installation found at C:\Users\Administrator\AppData\Local\Android\Sdk
       Android SDK package "cmdline-tools;latest" is already installed
       Android SDK package "platform-tools" is already installed
       Android SDK package "platforms;android-35" is already installed
       Android SDK package "build-tools;34.0.0" is already installed
       Android SDK installed ✅                                                                                                                     
       Run subprocess: ['C:\\Users\\Administrator\\flutter\\3.38.3\\bin\\dart.BAT', 'run', '--suppress-analytics', 'serious_python:main', 'package',
       'C:\\Users\\Administrator\\Desktop\\learn\\my-app\\src', '--platform', 'Android', '-r', 'android-notify>=1.60.6', '-r', 'flet>=0.80.1',      
       '--exclude', 'build', '--cleanup-packages', '--verbose']

( ● ) Packaging Python app...

Can you share a more verbose output using -vv flag?你能用 -vv 标志分享一个更详细的输出吗？
Even when I use -vv, I can only output this information. He has been stuck here for several hours...

It takes a lot to download Android SDKs for the first time. On a clean environment of GitHub Actions worker VM it takes 40 minutes to build an APK, see here: https://github.com/flet-dev/flet-build-test/actions/runs/20667336264

If you have slow/throttled internet it could take much longer.

For workaround, configure GitHub Action workflow and build the app in it.

For workaround, configure GitHub Action workflow and build the app in it.作为变通方法，配置 GitHub Action 工作流程并在其中构建应用。

Could a user manual for using github action work flow be written in the document?

For workaround, configure GitHub Action workflow and build the app in it.作为变通方法，配置 GitHub Action 工作流程并在其中构建应用。

Furthermore, stuck on (●) Packaging Python app... I also encountered this issue on 2.8 and it still occurs up to now. I'm not sure what the reason is because there is no more detailed log output. I hope you can test it on Windows? Do you need a Windows computer? We can sponsor you with one

I’m experiencing the same issue.

The build hangs at:
( ● ) Packaging Python app...

Environment:

OS: Windows 11 (24H2)
Flutter: 3.38.7 (stable)
Flet: 0.80.x
Android SDK: 34 / 35
JDK: 17

Before hanging, I see this error:
Command '['git', 'clone', 'https://github.com/flet-dev/flet-build-template.git']'
returned non-zero exit status 128

flutter doctor also shows:
[!] Proxy Configuration
! NO_PROXY is not set

The process does not exit or throw any error, it just hangs for 30+ minutes.

(GongGong) D:\update_gonggong\GongGong>flet build apk -vv
[21:36:33] Run subprocess: ['D:\flutter\3.38.7\bin\flutter.BAT', '--version', '--no-version-check', '--suppress-analytics']
[21:36:35] Flutter executable: D:\flutter\3.38.7\bin\flutter.BAT
Dart executable: D:\flutter\3.38.7\bin\dart.BAT
Configuring Flutter's path to JDK
Run subprocess: ['D:\flutter\3.38.7\bin\flutter.BAT', 'config', '--no-version-check', '--suppress-analytics', '--jdk-dir=D:\java\17.0.13+11']
[21:36:37] Setting "jdk-dir" value to "D:\java\17.0.13+11".

       You may need to restart any open editors for them to read new settings.
       JDK installed ✅
       Android SDK installation found at D:\Android\sdk
       Android SDK package "cmdline-tools;latest" is already installed
       Android SDK package "platform-tools" is already installed
       Android SDK package "platforms;android-35" is already installed
       Android SDK package "build-tools;34.0.0" is already installed
       Android SDK installed ✅

[21:37:07] Created app shell ✅
Run subprocess: ['D:\flutter\3.38.7\bin\dart.BAT', 'run', '--suppress-analytics', 'serious_python:main', 'package', 'D:\update_gonggong\GongGong\src', '--platform',
'Android', '-r', 'flet-video>=0.80.5', '-r', 'flet>=0.80.5', '--exclude', 'build', '--cleanup-packages', '--verbose']
( ● ) Packaging Python app...
Traceback (most recent call last):
File "C:\Users\Chen Xinglin\AppData\Roaming\uv\python\cpython-3.10.19-windows-x86_64-none\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\Chen Xinglin\AppData\Roaming\uv\python\cpython-3.10.19-windows-x86_64-none\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "D:\GongGong.venv\Scripts\flet.exe_main.py", line 10, in
File "D:\GongGong.venv\lib\site-packages\flet\cli.py", line 8, in main
flet_cli.cli.main()
File "D:\GongGong.venv\lib\site-packages\flet_cli\cli.py", line 115, in main
args.handler(args)
File "D:\GongGong.venv\lib\site-packages\flet_cli\commands\build.py", line 50, in handle
self.package_python_app()
File "D:\GongGong.venv\lib\site-packages\flet_cli\commands\build_base.py", line 1723, in package_python_app
package_result = self.run(
File "D:\GongGong.venv\lib\site-packages\flet_cli\commands\build_base.py", line 1940, in run
return processes.run(
File "D:\GongGong.venv\lib\site-packages\flet_cli\utils\processes.py", line 49, in run
stdout_line = process.stdout.readline()
File "C:\Users\Chen Xinglin\AppData\Roaming\uv\python\cpython-3.10.19-windows-x86_64-none\lib\codecs.py", line 319, in decode
def decode(self, input, final=False):
KeyboardInterrupt

fix: pass `--no-input` and bounded timeouts to `pip` (#246)

Thanks for the report, and sorry for the slow follow-up. A build stuck on "Packaging Python app..." on Windows is tracked in #5507, so I'm closing this one as a duplicate to keep everything in one place.

What has changed since 0.80.1:

Flet 0.85.0 fixed a Windows output redirect that hid the packaging log, which is why even -vv showed nothing.
Flet 1.0.0 runs pip with --no-input --timeout 30 --retries 3, so pip can no longer wait on a hidden credential prompt.

The main cause we still know about: when pip can't reach pypi.org, pypi.flet.dev or GitHub, it writes retry warnings, and the packaging step stops reading them after about 1 KB. pip then blocks and the build hangs silently. A fix for serious_python is in progress.

If you still see this on Flet 1.0.3, please post in #5507:

the last lines of flet build apk -v (output is visible again on 1.0)
whether pip download flet --no-deps --extra-index-url https://pypi.flet.dev works in a console on the same machine

If you're behind a proxy, set HTTPS_PROXY/HTTP_PROXY before running flet build. pip and the Python download both honor them.

About building on GitHub Actions: the docs now cover it at https://flet.dev/docs/publish#github-actions, using the official flet-build-action.

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bug: Always stop ( ● ) Packaging Python app... #5989

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bug: Always stop ( ● ) Packaging Python app... #5989

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ndonkoHenri commented on Jan 10, 2026

yst-one commented on Jan 10, 2026

yst-one commented on Jan 10, 2026

FeodorFitsner commented on Jan 10, 2026

FeodorFitsner commented on Jan 10, 2026

yst-one commented on Jan 12, 2026

yst-one commented on Jan 12, 2026

ChenXinglinRobot commented on Feb 2, 2026

ndonkoHenri commented on Oct 6, 2026

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