DownloadManager.Request.setNotificationVisibility 失败并出现 SecurityException：可见性值无效：2
我正在尝试在我的 Service 类中使用 DownloadManager：
DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
//imageUri is a valid Uri
Request downloadRequest= new Request(imageUri);
//without this line, it works
downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
//subpath is valid
downloadRequest.setDestinationInExternalFilesDir(this, null, subPath);
downloadManager.enqueue(downloadRequest);
如果没有 setNotificationVisibility，此代码可以正常工作。但它显示了一个我不想要的通知，因为我使用此代码在 ListView 中延迟加载图像。
据我了解，可以隐藏此通知，
downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
但在这种情况下，我的应用程序会崩溃：
02-19 02:24:24.055: E/AndroidRuntime(2572): java.lang.SecurityException：可见性值无效：2 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 android.os.Parcel.readException(Parcel.java:1327) 02-19 02:24:24.055: E/Android运行时(2572)：位于 android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:181) 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135) 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 android.content.ContentProviderProxy.insert(ContentProviderNative.java:415) 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 android.content.ContentResolver.insert(ContentResolver.java:730) 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 android.app.DownloadManager.enqueue(DownloadManager.java:885) 02-19 02:24:24.055: E/AndroidRuntime(2572): 在 MyService.getImage(MyService.java:112)
setNotificationVisibility 有什么问题吗？我怎样才能收到通知？
I'm trying to use DownloadManager in a Service class of mine:
DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
//imageUri is a valid Uri
Request downloadRequest= new Request(imageUri);
//without this line, it works
downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
//subpath is valid
downloadRequest.setDestinationInExternalFilesDir(this, null, subPath);
downloadManager.enqueue(downloadRequest);
Without setNotificationVisibility, this code works well. But it displays a notification, that I don't want, because I use this code for lazy-loading images in a ListView.
I understand, this notification can be hidden with
downloadRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
But in that case, my application crashes with:
02-19 02:24:24.055: E/AndroidRuntime(2572):
java.lang.SecurityException: Invalid value for visibility: 2 02-19
02:24:24.055: E/AndroidRuntime(2572): at
android.os.Parcel.readException(Parcel.java:1327) 02-19 02:24:24.055:
E/AndroidRuntime(2572): at
android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:181)
02-19 02:24:24.055: E/AndroidRuntime(2572): at
android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
02-19 02:24:24.055: E/AndroidRuntime(2572): at
android.content.ContentProviderProxy.insert(ContentProviderNative.java:415)
02-19 02:24:24.055: E/AndroidRuntime(2572): at
android.content.ContentResolver.insert(ContentResolver.java:730) 02-19
02:24:24.055: E/AndroidRuntime(2572): at
android.app.DownloadManager.enqueue(DownloadManager.java:885) 02-19
02:24:24.055: E/AndroidRuntime(2572): at
MyService.getImage(MyService.java:112)
Whats' wrong with setNotificationVisibility? How can I had the notification?
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根据文档，您需要清单中的以下权限：
注意
大多数清单权限将由 Android Studio 自动完成，但这不会自动完成。
You need the following permission in the manifest as per documentation:
Note
Most of the manifest permissions will be autocompleted by Android Studio, but this will not be auto-completed.
但还需要将该权限添加到 rn-fetch-blob 的清单中，但其中未给出。
but also need to add that permission to rn-fetch-blob's manifest that is not given in it.