requestPermission throws an Unknown error

[almawhoob]

I am getting the following error when requesting the user permission:

{
   "error": "requestPermission",
   "message": "Unknown error."
}

Here's a code snippet for checking and requesting permission:

let PERMISSIONS_NEEDED = [
   this.androidPermissions.PERMISSION.CAMERA, 
   this.androidPermissions.PERMISSION.WRITE_EXTERNAL_STORAGE
];

this.androidPermissions.checkPermission(PERMISSIONS_NEEDED[0]).then((result) => {
   
   // If no permission, request permission.
   if (!result.hasPermission || result.hasPermission == false || result.hasPermission == "false") {
      alert("REQUEST-PERMISSION");
      this.androidPermissions.requestPermissions(PERMISSIONS_NEEDED).then((_) => {
         alert("PERMISSION-GIVEN");
      })
      .catch(err => {
         alert("REQUEST-PERMISSION-ERROR: " + JSON.stringify(err)); // <<<<<<<<<<<<<<<< error
      });
   }
   // If permission is already granted, proceed normally.
   else {
      alert("ALREADY-HAVE-PERMISSION");
   }
}

Additional Information:

• Using Ionic 3
• Android Permissions plugin has been installed as instructed on the Ionic Official Documentation

[almawhoob]

Update: The code works on regular Android and iOS devices.

I am only getting the issue with Zebra TC51 (Android 6) – the plugin successfully checks if device has permission or not but it fails to request permission (it was working fine few weeks ago). Additional test has been done on a similar TC device and it is working fine. So, this seems to be a device issue at this point.

[davidquon]

I'm using a Samsung S9 running Android 10 and am encountering this issue as well. These are the permissions I'm asking for:

      let requestedPermissions = [
        this.androidPermissions.PERMISSION.ACCESS_COARSE_LOCATION,
        this.androidPermissions.PERMISSION.CAMERA,
        this.androidPermissions.PERMISSION.READ_EXTERNAL_STORAGE,
        this.androidPermissions.PERMISSION.READ_PHONE_STATE
      ];

I am however bringing in Zebra printer Cordova plugin. I'm not sure if it's related to this or not.
https://github.com/iParqDevelopers/zebralink

[davidquon]

Also in case it helps. I'm currently only building and having the issue on Android.

$ ionic info

Ionic:

   Ionic CLI                     : 6.12.3 (/Users/DQ/.nvm/versions/node/v10.20.0/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 5.5.2
   @angular-devkit/build-angular : 0.1000.8
   @angular-devkit/schematics    : 10.2.1
   @angular/cli                  : 10.2.1
   @ionic/angular-toolkit        : 2.3.3

Cordova:

   Cordova CLI       : 10.0.0
   Cordova Platforms : android 9.0.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 5.0.0, (and 16 other plugins)

Utility:

   cordova-res (update available: 0.15.2) : 0.15.1
   native-run (update available: 1.3.0)   : 1.1.0

System:

   Android SDK Tools : 26.1.1 (/Users/DQ/Library/Android/sdk)
   ios-deploy        : 1.11.0
   ios-sim           : ios-sim/9.0.0 darwin-x64 node-v10.20.0
   NodeJS            : v10.20.0 (/Users/DQ/.nvm/versions/node/v10.20.0/bin/node)
   npm               : 6.14.9
   OS                : macOS Catalina
   Xcode             : Xcode 12.3 Build version 12C33

[davidquon]

I think I figured out what the issue was for me. I had code that prompts for this.androidPermissions.PERMISSION.READ_EXTERNAL_STORAGE permission in the app start-up as well as another place in app resume. Since both of these code area are run at app start-up it would cause the Unknown error. Once I removed the secondary prompting for permissions everything works as expected.