使用Web3.py+Kivy+Buildozer在Colab编译APP遇cytoolz错误求助

项目代码与配置 #

main.py #

from kivymd.app import MDApp
from kivymd.uix.label import MDLabel
from web3 import Web3

class MainApp(MDApp):
    
    def build(self):
        bsc = 'https://bsc-dataseed.binance.org/'
        web3 = Web3(Web3.HTTPProvider(bsc))
    
        if (web3.isConnected()):
            print("Connected!")
            return MDLabel(text="OK connected ! ", halign="center")
        else:
            print("KO")
            return MDLabel(text="KO ", halign="center")

MainApp().run()

buildozer.spec 依赖配置 #

# (list) Application requirements
# comma separated e.g. requirements = sqlite3,kivy
requirements = 
    python3,
    cython,
    kivy,
    kivymd,
    pillow,
    android,
    attrdict,
    certifi,
    cffi,
    chardet,
    cytoolz,
    eth-abi,
    eth-account,
    eth-accounts,
    eth-hash,
    eth-keyfile,
    eth-keys,
    eth-rlp,
    eth-utils,
    eth-typing,
    hexbytes,
    idna,
    lru-dict,
    openssl,
    pycryptodome,
    pyzbar,
    raven,
    requests,
    rlp,
    setuptools,
    toolz,
    web3

首次运行错误（架构不兼容） #

编译成功但运行APP时，logcat输出错误：

08-22 08:36:31.065 16472 16505 I python  :  Traceback (most recent call last):
08-22 08:36:31.066 16472 16505 I python  :    File "/home/HelloWeb3/.buildozer/android/app/main.py", line 3, in <module>
08-22 08:36:31.066 16472 16505 I python  :    File "/home/HelloWeb3/.buildozer/android/platform/build-arm64-v8a/build/python-installs/helloweb3/arm64-v8a/web3/__init__.py", line 6, in <module>
08-22 08:36:31.066 16472 16505 I python  :    File "/home/HelloWeb3/.buildozer/android/platform/build-arm64-v8a/build/python-installs/helloweb3/arm64-v8a/eth_account/__init__.py", line 1, in <module>
08-22 08:36:31.066 16472 16505 I python  :    File "/home/HelloWeb3/.buildozer/android/platform/build-arm64-v8a/build/python-installs/helloweb3/arm64-v8a/eth_account/account.py", line 15, in <module>
08-22 08:36:31.066 16472 16505 I python  :    File "/home/HelloWeb3/.buildozer/android/platform/build-arm64-v8a/build/python-installs/helloweb3/arm64-v8a/cytoolz/__init__.py", line 1, in <module>
08-22 08:36:31.067 16472 16505 I python  :  ImportError: dlopen failed: "/data/user/0/org.test.helloweb3/files/app/_python_bundle/site-packages/cytoolz/itertoolz.so" is for EM_X86_64 (62) instead of EM_AARCH64 (183)
08-22 08:36:31.067 16472 16505 I python  : Python for android ended.

自定义Recipe尝试及新错误 #

为解决架构不兼容问题，自定义了toolz和cytoolz的编译Recipe：

toolz Recipe #

from pythonforandroid.recipe import CythonRecipe 


class ToolzRecipe(CythonRecipe): 
    """Build toolz"""

    version = "0.12.0"
    url = "https://github.com/pytoolz/toolz/archive/refs/tags/{version}.zip"
    name = "toolz"

    depends = ["setuptools"]


recipe = ToolzRecipe()

cytoolz Recipe #

from pythonforandroid.recipe import CythonRecipe 


class CytoolzRecipe(CythonRecipe): 
    """Build cytoolz"""

    version = "0.12.0"
    url = "https://github.com/pytoolz/cytoolz/archive/refs/tags/{version}.zip"
    name = "cytoolz"

    depends = ["setuptools"]


recipe = CytoolzRecipe()

修改后编译出现新错误：

[DEBUG]:    error: [Errno 2] No such file or directory: 'build/lib.linux-x86_64-3.9/cytoolz/_version.py'

解决建议 #

• 调整cytoolz Recipe的依赖与构建逻辑：cytoolz编译依赖toolz和cython，需在Recipe的depends中添加这两项；同时，编译时需要先生成_version.py，可通过重写build_arch方法添加构建参数：

  from pythonforandroid.recipe import CythonRecipe 
  
  class CytoolzRecipe(CythonRecipe): 
      """Build cytoolz"""
      version = "0.12.0"
      url = "https://github.com/pytoolz/cytoolz/archive/refs/tags/{version}.zip"
      name = "cytoolz"
      depends = ["setuptools", "toolz", "cython"]
  
      def build_arch(self, arch):
          self.setup_extra_args = ["--force"]
          super().build_arch(arch)
  
  recipe = CytoolzRecipe()
  

• 明确指定Android架构：在buildozer.spec中添加android.arch = arm64-v8a，确保编译工具链生成对应架构的产物。
• 改用纯Python版toolz：若cytoolz编译问题难以解决，可将requirements中的cytoolz替换为toolz（纯Python实现），web3.py可兼容该版本，跳过C扩展编译步骤。
• 清理缓存后重新编译：删除项目根目录下的.buildozer文件夹，执行buildozer android debug clean，彻底清除旧编译产物。
• 匹配版本兼容性：确保toolz和cytoolz的版本完全一致，避免版本不匹配导致的构建问题。

内容的提问来源于stack exchange，提问作者tony