Flutter - Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null,

Question

I am trying to use Hive database in my flutter project. In order to use hive db I will have to use path_provider package. I installed that too. but when I run the app again or restart it is neither running nor restarting and getting this error.

 Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)

E/flutter (15905): #0
PathProviderApi.getApplicationDocumentsPath
package:path_provider_android/messages.g.dart:9

ANDROID MANIFEST FILE PERMISSIONS

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
   />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
  />

MY CODE

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final document = await getApplicationDocumentsDirectory(); // ERROR AT THIS LINE
  Hive.init(document.path);
  runApp(const MyApp());
}

score 1 · Answer 1 · answered Dec 05 '22 at 07:49

Adding permission in AndroidManifest.xml file is like defining all the permission you may use in your app. but to actually use those permissions, you need to ask user to allow those permissions like using internal/external storage. One way to do this is with permission_handler package.

Jakhongir Anasov · Accepted Answer · 2022-12-05T11:33:56.063

1

Actually, I didn't put any uses-permission in Maneifest file to use Hive. Instead of Hive.init(), I would like to suggest to use Hive.initFlutter(). But without

final document = await getApplicationDocumentsDirectory();

inside initFlutter() method, these actions are already done by itself.

Future<void> main() async {
 WidgetsFlutterBinding.ensureInitialized();
 Hive.initFlutter();
 runApp(const MyApp());
}

edited Dec 05 '22 at 11:33

answered Dec 05 '22 at 08:45

Jakhongir Anasov

1,207
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16

No sir...getting same error. – swapnil mane Dec 05 '22 at 08:48
I have added the error image sir. – swapnil mane Dec 05 '22 at 08:59
Please, carefully do things in answers. I said without that line of code. But you din't delete it. I will update answer with code. Please edit the code exactly. – Jakhongir Anasov Dec 05 '22 at 11:32
Sir. problem got solved. in fact we created a new project and moved the all code into project and it worked. – swapnil mane Dec 05 '22 at 11:39
I am happy for you. So just to clarify did you change the code as I said or din’t? – Jakhongir Anasov Dec 05 '22 at 17:15
1

Your code worked...When we create a new project we use the code provided by you. And i have accepted your answer too...There is a question can we ask for a permission in main() function in flutter?? – swapnil mane Dec 06 '22 at 01:38
Yes of course. You can ask for permission. But I think it is not a good idea. What kinda permission do you want to ask? – Jakhongir Anasov Dec 06 '22 at 03:48
File handling permission or storage permission sir. – swapnil mane Dec 06 '22 at 05:37
Hmm. Ok. It would be appropriate if you do this in according page instead of main function – Jakhongir Anasov Dec 06 '22 at 07:31

Flutter - Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null,

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