Android App select file with Nextcloud App - File can't be read

📱 Desktop & mobile clients 🤖 Android
1

Hi,
I’m developing an Android App and want to support saving and restoring my backups using the nextcloud App.

  1. Backup is working (My own app is saving a zip file. The file can be shared with the nextcloud app and is then uploaded)

  2. Restore is not working yet. I’m sending an ACTION_GET_CONTENT intent and select the file from Nextcloud. The problem is that I can’t find a way to read the selected file. I tried different ways and even the one that worked from many different locations and apps is crashing. At least I can differentiate when the file was selected using nextcloud (uri authoritity org.nextcloud.documents)

val inputStream = context.contentResolver.openInputStream(uri) //uri returned from ACTION_GET_CONTENT by Nextcloud app

It always fails with FileNotFoundException:
Caused by: java.io.FileNotFoundException: Error downloading file: batteryManager2017_12_24_15_33_25.zip
at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:149)
at android.content.ContentProviderProxy.openTypedAssetFile(ContentProviderNative.java:705)
at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1687)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1503)
at android.content.ContentResolver.openInputStream(ContentResolver.java:1187)

Hope someone has an idea. Thanks

2

Hi,
I’ve run into the same issue right now. Have you found a solution?

3

Hi,
unfortunately no. I suppose there is a bug at the nextcloud’s content provider. But I’m quite lost with that issue.

4

Hi,
I currently believe it depends on the thread where the content reading access happens. I’ve two types of implementation now one is broken (UIThread) and one is working without this issue.

5

Oh crazy…thanks for the threading hint!
For me it is exactly the other way round. Up to now I’ve tried to restore in UiThread.
When I wrap the code in a doAsync (Anko method) block it is actually working. The data was set to the object returned by getImport() before and is used when calling exec.

    context?.let {
        doAsync {
            val daoList = getBackupConfig().createDaos( it )
            getImport().exec( it, daoList )
            daoList.forEach { dao -> dao.close() }
            it.runOnUiThread {
                binding.txtImportLog.text = getImport().getImportLog()
                setButtonEnabledState( binding.btnImport, true )
            } }
        }
    }
1 Like
7

I also have this problem. I also get a longer content URL on my device, not just the device Id. Has this been reported on GitHub yet?