unity 导入Firebase出现的坑
最近公司项目需要接入google的firebase sdk，来更好的分析用户行为。接入流程到firebase官网选择unity项目按照流程走就好了。接入完后出现了几个错误
错误一
Generation of the Firebase Android resource file google-services.xml from Assets/google-services.json failed.
If you have not included a valid Firebase Android resources in your app it will fail to initialize.
`F:/unity/50_Shopping_Island/../Assets/Firebase/Editor/generate_xml_from_google_services_json.exe -i "Assets/google-services.json" -l`.
Error loading Python DLL: C:\Users\ftb\AppData\Local\Temp\_MEI59722\python27.dll (error code 14001)
说是firebase初始化失败了，因为下载Python DLL失败。在网上查了一圈，似乎是因为win7系统和python版本的问题。最后找到了一个很好的解决方案。用pyinstaller重建generate_xml_from_google_services_json.py脚本。
解决步骤
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确保python环境变量已经配置好
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创建一个空文件夹，将项目路径\Assets\Firebase\Editor\下的generate_xml_from_google_services_json.py文件复制到空文件夹下。
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打开generate_xml_from_google_services_json.py文件，添加这两行
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在这个文件夹下启动命令行工具,执行pip install pyinstaller命令
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执行以下命令
pyinstaller --clean --win-private-assemblies -F generate_xml_from_google_services_json.py
- 最后会生成一个dist文件，将文件的exe复制并且覆盖unity项目路径\Assets\Firebase\Editor\中的同名文件
错误二
如果按照官方流程的话，可能还会出现一个错误，无法找到google-services.json文件中的一个字段。
Generation of the Firebase Android resource file google-services.xml from Assets/Firebase/GoogleService-Info.plist failed.
If you have not included a valid Firebase Android resources in your app it will fail to initialize.
"python" "/Users/xxxxx/Documents/ProgrammingCloud/Unity/yyyyy/Assets/Firebase/Editor/generate_xml_from_google_services_json.py" -i "Assets/Firebase/GoogleService-Info.plist" -l --plist
Could not find key in plist file: [DATABASE_URL]
You can start to diagnose this issue by executing ""python" "/Users/xxxxx/Documents/ProgrammingCloud/Unity/yyyyy/Assets/Firebase/Editor/generate_xml_from_google_services_json.py" -i "Assets/Firebase/GoogleService-Info.plist" -l --plist" from the command line.
解决方法：
1.在firebase面板中创建一个Realtime Database.
2.重新下载google-services文件，替换原来Asset文件下的google-services文件
最后文件中会多出一个firebase_url文件的配置，报错就解决了
