使用tapo-plug、Kivy和Buildozer开发安卓App启动崩溃：sys未定义

问题详情 #

使用tapo-plug、Kivy和Buildozer开发的安卓应用启动即崩溃，手机返回报错栈：

02-04 16:32:53.560 23072 23113 I python  :  Traceback (most recent call last):
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/app/main.py", line 19, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/tapo_plug/tapoPlugApi.py", line 11, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/tapo_plug/tapoEncryption.py", line 7, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/Crypto/PublicKey/RSA.py", line 38, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/Crypto/IO/PKCS8.py", line 44, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/Crypto/IO/_PBES.py", line 43, in <module>
02-04 16:32:53.561 23072 23113 I python  :    File "/home/daniel/test/ServerManagementApp/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/python-installs/Vexludus/arm64-v8a/Crypto/Hash/MD5.py", line 45, in <module>
02-04 16:32:53.561 23072 23113 I python  :  NameError: name 'sys' is not defined
02-04 16:32:53.561 23072 23113 I python  : Python for android ended.

报错关联的代码片段：

from Crypto.Util.py3compat import *
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib,
VoidPointer, SmartPointer,
create_string_buffer,
get_raw_buffer, c_size_t,
c_uint8_ptr)

_raw_md5_lib = load_pycryptodome_raw_lib("Crypto.Hash._MD5",
"""
#define MD5_DIGEST_SIZE 16

                    int MD5_init(void **shaState);
                    int MD5_destroy(void *shaState);
                    int MD5_update(void *hs,
                                      const uint8_t *buf,
                                      size_t len);
                    int MD5_digest(const void *shaState,
                                      uint8_t digest[MD5_DIGEST_SIZE]);
                    int MD5_copy(const void *src, void *dst);

                    int MD5_pbkdf2_hmac_assist(const void *inner,
                                        const void *outer,
                                        const uint8_t first_digest[MD5_DIGEST_SIZE],
                                        uint8_t final_digest[MD5_DIGEST_SIZE],
                                        size_t iterations);
                    """)

当前requirements配置包含：tapo-plug、Crypto、PyCryptodome、pyjwkest、pycrypto

原因分析 #

1. 依赖包冲突：同时声明Crypto、PyCryptodome、pycrypto会导致模块加载混乱。PyCryptodome是pycrypto的官方替代版本，且自身已经包含Crypto命名空间，重复引入会引发模块导入异常。
2. 模块缺失导入：Crypto.Util.py3compat内部依赖sys模块，但在安卓打包环境中，该模块可能未被正确导入，导致MD5.py调用时触发NameError。

解决步骤 #

• 清理冲突依赖：修改buildozer.spec中的requirements，只保留必要的包，删除Crypto和pycrypto，最终配置示例：

  requirements = python3,kivy,tapo-plug,PyCryptodome,pyjwkest
  

• 清理旧构建缓存：执行命令彻底清除之前的构建文件，避免残留冲突：

  buildozer android clean
  

• 重新打包应用：重新执行构建命令，确保新的依赖被正确安装和打包：

  buildozer android debug deploy run
  

• 临时修复（若上述方法无效）：找到本地依赖中的Crypto/Hash/MD5.py文件，在文件开头添加import sys语句，再重新打包。但此方法仅作临时 workaround，优先推荐依赖清理方案。

内容的提问来源于stack exchange，提问作者Vexludus