DocumentFile.makeFile is giving me null and app crashes on some devices about simplestorage HOT 7 CLOSED

What's the library version that caused this issue?

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What's the library version that caused this issue?

I use the latest version 1.5.0, but I don't think that the problem from the library itself, I think the problem comes from this package androidx.documentfile.provider
This function return null.

     /**
     * @return file representing newly created document, or null if failed
     */
    @Nullable
    public abstract DocumentFile createFile(@NonNull String mimeType, @NonNull String displayName);

And the same for createFolder.

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Can you copy showGrantedUris() from this file and test it on your project?

I want to see the list of granted URIs on your Xiaomi device.

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Can you copy showGrantedUris() from this file and test it on your project?

SimpleStorage/sample/src/main/java/com/anggrayudi/storage/sample/StorageInfoAdapter.kt

Line 69 in 7b8a635

private fun showGrantedUris(context: Context, filterStorageId: String) {

I want to see the list of granted URIs on your Xiaomi device.

I tested it and this is what it gives me:
Granted URIs [/storage/emulated/0/Download]

I already testing if the app have access to the chosen URI by user before perform anything else. with this fun:

private fun isStorageUriGranted(storageId: String, basePath: String): Boolean{
        val root = createDocumentUri(storageId, basePath)
        val contentResolver = applicationContext.contentResolver

        return contentResolver.persistedUriPermissions.any {

            it.isReadPermission && it.isWritePermission && it.uri == root
        }
}

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I see... So, your URI is only applicable to Download folder, but you were trying to make folder outside this directory. If you want to create folders inside this path, please use DocumentFileCompat.fromPublicFolder():

val download = DocumentFileCompat.fromPublicFolder(this, PublicDirectory.DOWNLOADS, requiresWriteAccess = true) ?: return
val newFolder = download.makeFolder(this, "Example") ?: return

You'll not be able to access parent from path /storage/emulated/0/Download, because your URI is only limited to this path, hence the parent is always null.

But if you want wider access for Android 10, please grant access to the root path of the storage partition, in this case /storage/emulated/0. In Android 10, if your granted URI is this path, then you'll be able to create folders anywhere in that storage partition.

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val download = DocumentFileCompat.fromPublicFolder(this, PublicDirectory.DOWNLOADS, requiresWriteAccess = true) ?: return
val newFolder = download.makeFolder(this, "Example") ?: return

This appears to not work anymore, failing with a java.lang.NullPointerException when calling the makeFolder() func.

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In fact, the following causes a NullPointerException too on Android 11:

val download = DocumentFileCompat.fromPublicFolder(appContext, PublicDirectory.DOWNLOADS, requiresWriteAccess=true)
Log.d("MyApp", "Debugv Can write to Downloads? " + download!!.canModify(appContext))

/EDIT: the solution here works: #84 (comment)

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