英文:
Getting error in create() function of MongoDB Atlas in Flutter
问题
我正在使用Atlas服务来访问我的Flutter项目中的数据库。调试构建正常工作，但在发布构建中，用于实例化数据库对象的create()方法出现了某种错误。我已经在AndroidManifest.xml中添加了INTERNET权限，但错误仍然存在。
这是在运行发布构建时终端的日志：
E/flutter (14697): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Failed host lookup: ‘dns.google.com’
E/flutter (14697): #0 IOClient.send (package:http/src/io_client.dart:94)
E/flutter (14697):
E/flutter (14697): #1 BaseClient._sendUnstreamed (package:http/src/base_client.dart:93)
E/flutter (14697):
E/flutter (14697): #2 HttpUtils._get (package:basic_utils/src/HttpUtils.dart:24)
E/flutter (14697):
E/flutter (14697): #3 HttpUtils.getForJson (package:basic_utils/src/HttpUtils.dart:49)
E/flutter (14697):
E/flutter (14697): #4 DnsUtils.lookupRecord (package:basic_utils/src/DnsUtils.dart:33)
E/flutter (14697):
E/flutter (14697): #5 decodeDnsSeedlist (package:mongo_dart/src/database/utils/dns_lookup.dart:19)
E/flutter (14697):
E/flutter (14697): #6 Db.create (package:mongo_dart/src/database/db.dart:271)
E/flutter (14697):
E/flutter (14697): #7 MongoDb.connect (package:student_portal/services/mongo_db.dart:21)
E/flutter (14697):
E/flutter (14697): #8 main (package:student_portal/main.dart:13)
E/flutter (14697):
E/flutter (14697):
mongo_db.dart的第21行是：
_db = await Db.create(mongoURL);
而main.dart的第13行是调用connect方法：
Future connect() async {
_db = await Db.create(mongoURL);
await _db!.open(secure: true);
}
英文:
I am using the atlas service to access a database from my flutter project. The debug build is working fine but in the release build the create() method to instantiate the database object is giving somekind of error. I have added the INTERNET permission in the AndroidManifest.xml but the error is still there.
This is the log of the terminal in running release build
E/flutter (14697): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Failed host lookup: ‘dns.google.com’
E/flutter (14697): #0 IOClient.send (package:http/src/io_client.dart:94)
E/flutter (14697):
E/flutter (14697): #1 BaseClient._sendUnstreamed (package:http/src/base_client.dart:93)
E/flutter (14697):
E/flutter (14697): #2 HttpUtils._get (package:basic_utils/src/HttpUtils.dart:24)
E/flutter (14697):
E/flutter (14697): #3 HttpUtils.getForJson (package:basic_utils/src/HttpUtils.dart:49)
E/flutter (14697):
E/flutter (14697): #4 DnsUtils.lookupRecord (package:basic_utils/src/DnsUtils.dart:33)
E/flutter (14697):
E/flutter (14697): #5 decodeDnsSeedlist (package:mongo_dart/src/database/utils/dns_lookup.dart:19)
E/flutter (14697):
E/flutter (14697): #6 Db.create (package:mongo_dart/src/database/db.dart:271)
E/flutter (14697):
E/flutter (14697): #7 MongoDb.connect (package:student_portal/services/mongo_db.dart:21)
E/flutter (14697):
E/flutter (14697): #8 main (package:student_portal/main.dart:13)
E/flutter (14697):
E/flutter (14697):
21th line of the mongo_db.dart is
_db = await Db.create(mongoURL);
and in 13th line of main I am calling the connect method
Future connect() async {
_db = await Db.create(mongoURL);
await _db!.open(secure: true);
}
答案1
得分: 0
请确保您已经在您的应用程序的 android/app/src/main/AndroidManifest.xml 文件中添加了以下内容：
<uses-permission android:name="android.permission.INTERNET" />
https://i.stack.imgur.com/aVDa3.png
在之前的Flutter版本中，默认情况下会有这行代码。似乎它们在最近的更新中已被移除。
英文:
Make sure you have added
<uses-permission android:name="android.permission.INTERNET" />
in your app's android/app/src/main/AndroidManifest.xml
https://i.stack.imgur.com/aVDa3.png
This line used to be there on default on previous version of Flutter. It seems that they have removed on the recent updates.
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