Add method to check if storage permission is granted

[TheLastGimbus]

We already have PhotoManager.requestPermission() for getting permission.

It would be nice to have method to check if permission is granted.

[TheLastGimbus]

I wrote this wile writing some code that was using PhotoManager in the background (using workmanager

It keeps giving me exception:

E/MethodChannel#top.kikt/photo_manager( 5686): Failed to handle method call
E/MethodChannel#top.kikt/photo_manager( 5686): java.lang.NullPointerException: 获取权限的Activity不存在
E/MethodChannel#top.kikt/photo_manager( 5686): 	at top.kikt.imagescanner.permission.PermissionsUtils.getPermissionsWithTips(PermissionsUtils.java:110)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at top.kikt.imagescanner.permission.PermissionsUtils.getPermissions(PermissionsUtils.java:95)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at top.kikt.imagescanner.core.PhotoManagerPlugin.onMethodCall(PhotoManagerPlugin.kt:152)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:231)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:93)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:642)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at android.os.MessageQueue.next(MessageQueue.java:326)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at android.os.Looper.loop(Looper.java:160)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at android.app.ActivityThread.main(ActivityThread.java:6718)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
E/MethodChannel#top.kikt/photo_manager( 5686): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

At first, I thought that it's because I don't have a permission

java.lang.NullPointerException: 获取权限的Activity不存在

But it looks like you specifically use some activity when checking for permission.
It needs to be fixed to work even when no activity is present.

[CaiJingLong]

Unfortunately, you must have an Activity instance to apply for runtime permissions.
WorkManager cannot provide an Activity instance, so you cannot use the library in the background.

[TheLastGimbus]

I just tested this with workmanager and permission_handler plugins. Permission handler can get permission status in background, without any activity, even in "recent apps" list, without any problem.

If this is just a thing of checking permission, we can just use permission_handler plugin, and everything will work!

[alejandrogiubel]

I have the same error. I am using workmanager and PhotoManager and I need to process some photos in background and I have this error

E/MethodChannel#top.kikt/photo_manager(16516): Failed to handle method call
E/MethodChannel#top.kikt/photo_manager(16516): java.lang.NullPointerException: 获取权限的Activity不存在
E/MethodChannel#top.kikt/photo_manager(16516): 	at top.kikt.imagescanner.permission.PermissionsUtils.getPermissionsWithTips(PermissionsUtils.java:110)
E/MethodChannel#top.kikt/photo_manager(16516): 	at top.kikt.imagescanner.permission.PermissionsUtils.getPermissions(PermissionsUtils.java:95)
E/MethodChannel#top.kikt/photo_manager(16516): 	at top.kikt.imagescanner.core.PhotoManagerPlugin.onMethodCall(PhotoManagerPlugin.kt:157)
E/MethodChannel#top.kikt/photo_manager(16516): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:230)
E/MethodChannel#top.kikt/photo_manager(16516): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#top.kikt/photo_manager(16516): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/MethodChannel#top.kikt/photo_manager(16516): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#top.kikt/photo_manager(16516): 	at android.os.MessageQueue.next(MessageQueue.java:336)
E/MethodChannel#top.kikt/photo_manager(16516): 	at android.os.Looper.loop(Looper.java:197)
E/MethodChannel#top.kikt/photo_manager(16516): 	at android.app.ActivityThread.main(ActivityThread.java:7811)
E/MethodChannel#top.kikt/photo_manager(16516): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#top.kikt/photo_manager(16516): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
E/MethodChannel#top.kikt/photo_manager(16516): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)
I/WM-WorkerWrapper(16516): Worker result FAILURE for Work [ id=fd0036ed-1aee-4afa-b57b-2f6a423aa559, tags={ be.tramckrijte.workmanager.BackgroundWorker } ]

And this is my code

Future<void> deleteUnusedImageFromDataBase() async {
  print('Start deleteUnusedImageFromDataBase');
  bool permission = await Permission.storage.isGranted;
  print(permission);
  if (permission) {
    List<AssetPathEntity> albums = await PhotoManager.getAssetPathList(onlyAll: true, type: RequestType.image);
    List<AssetEntity> media = await albums[0].assetList;
    print('works');
    var box = Hive.box(imagesBox);
    box.toMap().forEach((key, value) {
      ProcessedImage pi = value as ProcessedImage;
      bool exist = false;
      for (int i = 0; i < media.length; i++) {
        if (pi.id == media[i].id) {
          exist = true;
          break;
        }
      }
      if (!exist) {
        pi.delete();
      }
    });
    print('Finish deleteUnusedImageFromDataBase');
  }
}

Is there any way to use PhotoManager in background?

[alejandrogiubel]

I resolved the issue using PhotoManager.setIgnorePermissionCheck(true);. Thank.

[TheLastGimbus]

Do other functions work? Like, actually getting images?

[alejandrogiubel]

@TheLastGimbus I use PhotoManager.getAssetPathList(onlyAll: true, type: RequestType.image) in background process with workmanager. This is the only function that I use in workmanager.

[TheLastGimbus]

And... it works? Without the app in the foreground whatsoever?

Also, I'm not recently in touch with my project that used this library - I would be really grateful if you could quickly check if some other functions work 🙏❤️

[alejandrogiubel]

Yes. So far it works. I process images in the background using those two libraries. With the application in the foreground, the process works completely to finish but when I close the application the process only take approximately 55 seconds and them is cancelled, but I think it was a change in the code that I made. Right now I don't have my code at my disposal but as soon as I can I can verify what you ask me. 👍

[alejandrogiubel]

Ok. I check if other function work and... (drumroll)... it works.
I use this method that delete an image with ID = 20873 and execute it (in background) when I close the app.

backGroundTest() {
  PhotoManager.editor.deleteWithIds(['20873']);
}

[danielseow-simplify]

I resolved the issue using PhotoManager.setIgnorePermissionCheck(true);. Thank.

@alejandrogiubel I've tried doing like this, is this the right way?

await PhotoManager.setIgnorePermissionCheck(true);
List<AssetPathEntity> list = await PhotoManager.getAssetPathList(type: RequestType.image);

but it still prompt me this permission dialog, how can I stop this dialog from showing every time when user only choose selected photos to be accessed?

[TheLastGimbus]

Maybe you didn't await ?

[danielseow-simplify]

@TheLastGimbus Oops, sorry I accidentally removed it when I was doing screenshot, actually I was having the same issue with await as well

[AlexV525]

Permissions would be dynamic checking things, so I guess the most proper way is to use the request method instead?

[AlexV525]

There are multiple requests/features involved in the whole discussion, if anyone have questions other than the new method, please submit new issues instead of leaving new comments here.

[Kal-Elx]

I resolved the issue using PhotoManager.setIgnorePermissionCheck(true);. Thank.

@alejandrogiubel I've tried doing like this, is this the right way?

await PhotoManager.setIgnorePermissionCheck(true);
List<AssetPathEntity> list = await PhotoManager.getAssetPathList(type: RequestType.image);

but it still prompt me this permission dialog, how can I stop this dialog from showing every time when user only choose selected photos to be accessed?

If anyone is finding this issue because they have the same problem as @danielseow-simplify the solution is to add PHPhotoLibraryPreventAutomaticLimitedAccessAlert: YES to info.plist as suggested in this article.