Not able to build a Flet Counter app into APK format on Windows 11

[TheCodeCache]

Hi,

I've been trying to build a very simple flet counter app to APK file, but it stucks at the same place everytime. I've verified all the configuration as per the these docs : doc1, doc2, doc3, and verified all the installations, yet it fails to build and gets stuck after installing the dependencies. Please find below steps that I performed:

I'm running these steps on my local Windows 11, with 12 GB of RAM and 256 of SSD capacity.

Step 1: Install java 8 and verify its version:

C:\Users\manor>java -version
java version "1.8.0_333"
Java(TM) SE Runtime Environment (build 1.8.0_333-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.333-b02, mixed mode)

Step 2: Install Python 3.11.6

C:\Users\manor>python --version
Python 3.11.6

Step 3: Install Flutter (latest 3.24.3) and verify its version:

C:\Users\manor>flutter --version
Flutter 3.24.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 2663184aa7 (2 weeks ago) • 2024-09-11 16:27:48 -0500
Engine • revision 36335019a8
Tools • Dart 3.5.3 • DevTools 2.37.3

Step 4: Install Android Studio (latest Koala 2024.1.2)
and installed all these components:

Android SDK Platform, API 35.0.1
Android SDK Command-line Tools
Android SDK Build-Tools
Android SDK Platform-Tools

Step 5: Configure below Environment Variables into both user path as well as system path:

C:\Users\manor\dev\flutter\bin
C:\Users\manor\AppData\Local\Android\Sdk\cmdline-tools\latest\bin
C:\Users\manor\AppData\Local\Android\Sdk\platform-tools
C:\Users\manor\AppData\Local\Android\Sdk\build-tools\35.0.0

Step 6: Verify the installation with flutter doctor,

C:\Users\manor>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.24.3, on Microsoft Windows [Version 10.0.22631.4169], locale en-IN)
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[√] Chrome - develop for the web
[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.9.5)
[√] Android Studio (version 2024.1)
[√] VS Code (version 1.93.1)
[√] Connected device (3 available)
[√] Network resources

• No issues found!

Step 7: Create a simple flet counter app and make sure it works:

import flet as ft


def main(page: ft.Page):
    page.title = "Flet Counter Example 1"
    page.vertical_alignment = ft.MainAxisAlignment.CENTER

    txt_number = ft.TextField(value="0", text_align=ft.TextAlign.RIGHT, width=100)

    def minus_click(e):
        txt_number.value = str(int(txt_number.value) - 1)
        page.update()

    def plus_click(e):
        txt_number.value = str(int(txt_number.value) + 1)
        page.update()

    page.add(
        ft.Row(
            [
                ft.IconButton(ft.icons.REMOVE, on_click=minus_click),
                txt_number,
                ft.IconButton(ft.icons.ADD, on_click=plus_click),
            ],
            alignment=ft.MainAxisAlignment.CENTER,
        )
    )


if __name__ == "__main__":
    ft.app(main)

Verify its output:

This is my code folder structure:

and requirements.txt file contains just one package flet and nothing else:

Step 8: Run the below flet build command:

flet build apk -vv

Here is the command line logs:

C:\Users\manor\Downloads\the_app\code\hi_flet>flet build apk -vv

[14:06:22] Flutter executable: C:\Users\manor\dev\flutter\bin\flutter.BAT
           Dart executable: C:\Users\manor\dev\flutter\bin\dart.BAT
           Flutter bootstrap directory: C:\Users\manor\AppData\Local\Temp\flet_flutter_build_RVzVXz8if3
           No additional Flutter dependencies!
[14:06:25] Created Flutter bootstrap project from gh:flet-dev/flet-build-template with ref 0.24.1 ✅
           Copying C:\Users\manor\Downloads\the_app\code\hi_flet\assets\icon.png to
           C:\Users\manor\AppData\Local\Temp\flet_flutter_build_RVzVXz8if3\images
           Customized app icons and splash images ✅
           Run subprocess: ['C:\\Users\\manor\\dev\\flutter\\bin\\dart.BAT', 'run', 'flutter_launcher_icons']
( ●    ) Generating app icons (2.5s)
Downloading packages...
Got dependencies in `C:\Users\manor\AppData\Local\Temp\flet_flutter_build_RVzVXz8if3`.
(     ●) Generating app icons ⏳...
Built flutter_launcher_icons:flutter_launcher_icons.
( ●    ) Generating app icons ⏳...   ════════════════════════════════════════════
     FLUTTER LAUNCHER ICONS (v0.13.1)
  ════════════════════════════════════════════

(  ●   ) Generating app icons ⏳... • Creating default icons Android
(   ●  ) Generating app icons ⏳... • Overwriting the default Android launcher icon with a new icon
(   ●  ) Generating app icons ⏳... • Overwriting default iOS launcher icon with new icon
(   ●  ) Generating app icons ⏳... Creating Icons for Web...
(  ●   ) Generating app icons ⏳... Creating Icons for Windows...
( ●    ) Generating app icons ⏳... Creating Icons for MacOS...
(     ●) Generating app icons ⏳...
✓ Successfully generated launcher icons
[14:06:32] Generated app icons ✅
           Run subprocess: ['C:\\Users\\manor\\dev\\flutter\\bin\\dart.BAT', 'run', 'flutter_native_splash:create']
( ●    ) Generating splash screens (1.5s)
Built flutter_native_splash:create.
(    ● ) Generating splash screens ⏳... [Android] Creating default splash images
(  ●   ) Generating splash screens ⏳... [Android] Creating dark mode splash images
(    ● ) Generating splash screens ⏳... [Android] Creating default android12splash images
(   ●  ) Generating splash screens ⏳... [Android] Creating dark mode android12splash images
(   ●  ) Generating splash screens ⏳... [Android] Updating launch background(s) with splash image path...
(     ●) Generating splash screens ⏳... [Android]  - android/app/src/main/res/drawable/launch_background.xml
[Android]  - android/app/src/main/res/drawable-night/launch_background.xml
[Android]  - android/app/src/main/res/drawable-v21/launch_background.xml
[Android]  - android/app/src/main/res/drawable-night-v21/launch_background.xml
[Android] Updating styles...
[Android]  - android/app/src/main/res/values-v31/styles.xml
[Android] No android/app/src/main/res/values-v31/styles.xml found in your Android project
[Android] Creating android/app/src/main/res/values-v31/styles.xml and adding it to your Android project
(   ●  ) Generating splash screens ⏳... [Android]  - android/app/src/main/res/values-night-v31/styles.xml
[Android] No android/app/src/main/res/values-night-v31/styles.xml found in your Android project
[Android] Creating android/app/src/main/res/values-night-v31/styles.xml and adding it to your Android project
[Android]  - android/app/src/main/res/values/styles.xml
[Android]  - android/app/src/main/res/values-night/styles.xml
[iOS] Creating  images
[iOS] Creating dark mode  images
(  ●   ) Generating splash screens ⏳... [iOS] Updating ios/Runner/Info.plist for status bar hidden/visible
(   ●  ) Generating splash screens ⏳... [Web] Creating images
(  ●   ) Generating splash screens ⏳... [Web] Creating images
(   ●  ) Generating splash screens ⏳... [Web] Creating background images
[Web] Creating CSS
(    ● ) Generating splash screens ⏳... [Web] Updating index.html

✅ Native splash complete.
Now go finish building something awesome! 💪 You rock! 🤘🤩
Like the package? Please give it a 👍 here: https://pub.dev/packages/flutter_native_splash

[14:06:38] Generated splash screens ✅
           Run subprocess: ['C:\\Users\\manor\\dev\\flutter\\bin\\dart.BAT', 'run', 'serious_python:main', 'package',
           'C:\\Users\\manor\\Downloads\\the_app\\code\\hi_flet', '--mobile', '--platform', 'mobile', '--dep-mappings', 'flet=flet-embed',
           '--req-deps', 'flet-embed', '--exclude', 'build', '--verbose']
(  ●   ) Packaging Python app ⏳...
Built serious_python:main.
(    ● ) Packaging Python app ⏳... Running package command
Creating asset directory: C:\Users\manor\AppData\Local\Temp\flet_flutter_build_RVzVXz8if3\app
Copying Python app from C:\Users\manor\Downloads\the_app\code\hi_flet to C:\Users\manor\AppData\Local\Temp\serious_python_tempbcaf66d7
(   ●  ) Packaging Python app ⏳... Configured mobile platform with sitecustomize.py at C:\Users\manor\AppData\Local\Temp\serious_python_sitecustomize8bdf18b8\sitecustomize.py
Installing dependencies [flet-embed] with pip command to C:\Users\manor\AppData\Local\Temp\serious_python_tempbcaf66d7\__pypackages__
Extracting Python distributive from C:\Users\manor\AppData\Local\Temp\cpython-3.11.6+20231002-x86_64-pc-windows-msvc-shared-install_only.tar.gz to C:\Users\manor\AppData\Local\Temp\hostpython3.11_36ae20a5
(  ●   ) Packaging Python app ⏳... VERBOSE: C:\Users\manor\AppData\Local\Temp\hostpython3.11_36ae20a5\python\python.exe -m pip install --isolated --upgrade --target C:\Users\manor\AppData\Local\Temp\serious_python_tempbcaf66d7\__pypackages__ flet-embed
( ●    ) Packaging Python app ⏳... VERBOSE: Collecting flet-embed
VERBOSE: Using cached flet_embed-0.24.1-py3-none-any.whl.metadata (1.0 kB)
(   ●  ) Packaging Python app ⏳... VERBOSE: Collecting flet-runtime==0.24.1 (from flet-embed)
VERBOSE: Using cached flet_runtime-0.24.1-py3-none-any.whl.metadata (1.1 kB)
(     ●) Packaging Python app ⏳... VERBOSE: Collecting flet-core==0.24.1 (from flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached flet_core-0.24.1-py3-none-any.whl.metadata (971 bytes)
(    ● ) Packaging Python app ⏳... VERBOSE: Collecting httpx<1,>=0 (from flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached httpx-0.27.2-py3-none-any.whl.metadata (7.1 kB)
(  ●   ) Packaging Python app ⏳... VERBOSE: Collecting oauthlib<4.0.0,>=3.2.2 (from flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached oauthlib-3.2.2-py3-none-any.whl.metadata (7.5 kB)
( ●    ) Packaging Python app ⏳... VERBOSE: Collecting repath<0.10.0,>=0.9.0 (from flet-core==0.24.1->flet-runtime==0.24.1->flet-embed)
(●     ) Packaging Python app ⏳... VERBOSE: Using cached repath-0.9.0-py3-none-any.whl.metadata (899 bytes)
( ●    ) Packaging Python app ⏳... VERBOSE: Collecting anyio (from httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached anyio-4.6.0-py3-none-any.whl.metadata (4.6 kB)
(  ●   ) Packaging Python app ⏳... VERBOSE: Collecting certifi (from httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached certifi-2024.8.30-py3-none-any.whl.metadata (2.2 kB)
(     ●) Packaging Python app ⏳... VERBOSE: Collecting httpcore==1.* (from httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached httpcore-1.0.5-py3-none-any.whl.metadata (20 kB)
(    ● ) Packaging Python app ⏳... VERBOSE: Collecting idna (from httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached idna-3.10-py3-none-any.whl.metadata (10 kB)
(  ●   ) Packaging Python app ⏳... VERBOSE: Collecting sniffio (from httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached sniffio-1.3.1-py3-none-any.whl.metadata (3.9 kB)
( ●    ) Packaging Python app ⏳... VERBOSE: Collecting h11<0.15,>=0.13 (from httpcore==1.*->httpx<1,>=0->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached h11-0.14.0-py3-none-any.whl.metadata (8.2 kB)
( ●    ) Packaging Python app ⏳... VERBOSE: Collecting six>=1.9.0 (from repath<0.10.0,>=0.9.0->flet-core==0.24.1->flet-runtime==0.24.1->flet-embed)
VERBOSE: Using cached six-1.16.0-py2.py3-none-any.whl.metadata (1.8 kB)
VERBOSE: Using cached flet_embed-0.24.1-py3-none-any.whl (3.2 kB)
VERBOSE: Using cached flet_runtime-0.24.1-py3-none-any.whl (19 kB)
VERBOSE: Using cached flet_core-0.24.1-py3-none-any.whl (412 kB)
VERBOSE: Using cached httpx-0.27.2-py3-none-any.whl (76 kB)
VERBOSE: Using cached httpcore-1.0.5-py3-none-any.whl (77 kB)
(  ●   ) Packaging Python app ⏳... VERBOSE: Using cached oauthlib-3.2.2-py3-none-any.whl (151 kB)
VERBOSE: Using cached repath-0.9.0-py3-none-any.whl (4.7 kB)
VERBOSE: Using cached anyio-4.6.0-py3-none-any.whl (89 kB)
VERBOSE: Using cached idna-3.10-py3-none-any.whl (70 kB)
VERBOSE: Using cached sniffio-1.3.1-py3-none-any.whl (10 kB)
VERBOSE: Using cached certifi-2024.8.30-py3-none-any.whl (167 kB)
VERBOSE: Using cached h11-0.14.0-py3-none-any.whl (58 kB)
VERBOSE: Using cached six-1.16.0-py2.py3-none-any.whl (11 kB)
(   ●  ) Packaging Python app ⏳... VERBOSE: Installing collected packages: sniffio, six, oauthlib, idna, h11, certifi, repath, httpcore, anyio, httpx, flet-core, flet-runtime, flet-embed
(   ●  ) Packaging Python app ⏳...

The issue is: it gets completely stuck on last step as shown above, waited for sufficiently long for about 1 hr, yet it does not move forward at all.

However, when I stop this with ctrl+C , I get below logs:

(     ●) Packaging Python app ⏳...
^CThe system cannot open the device or file specified.
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\manor\Downloads\the_app\code\hi_flet\venv\Scripts\flet.exe\__main__.py", line 7, in <module>
  File "C:\Users\manor\Downloads\the_app\code\hi_flet\venv\Lib\site-packages\flet\cli\cli.py", line 88, in main
    args.handler(args)
  File "C:\Users\manor\Downloads\the_app\code\hi_flet\venv\Lib\site-packages\flet\cli\commands\build.py", line 790, in handle
    package_result = self.run(
                     ^^^^^^^^^
  File "C:\Users\manor\Downloads\the_app\code\hi_flet\venv\Lib\site-packages\flet\cli\commands\build.py", line 945, in run
    r = subprocess.run(
        ^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\subprocess.py", line 550, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\subprocess.py", line 1201, in communicate
    self.wait()
  File "C:\Program Files\Python311\Lib\subprocess.py", line 1264, in wait
    return self._wait(timeout=timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\subprocess.py", line 1588, in _wait
    result = _winapi.WaitForSingleObject(self._handle,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyboardInterrupt
^C

Additionally, I've also followed these video resources from youtube in order to resolve above issue, but no luck

link1, link2, link3, link4, link5

Please help, Would really appreciate

[tanmay-bhatgare]

Glad to help! See this I think this is some sort of bug in flet codebase itself, so when you download java8 it is for packaging app which includes native(non pure, which are not entirely written in python) python modules or libraries, so you don't have to do that for a simple counter app. Give this discussion a try.