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feat(android): receive into system Downloads via MediaStore

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Default Android receive destination is now the shared system Downloads
collection (like desktop), using MediaStore on API 29+ instead of
app-private storage. Legacy app-private defaults are promoted back to
public Downloads so existing installs pick up the fix.
This commit is contained in:
Hammed Abass
2026-07-12 04:43:34 +02:00
parent d5d4e37d1c
commit a79c61b9d7
8 changed files with 255 additions and 35 deletions
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crates/vnidrop/CORE_FLOW.md
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@@ -65,10 +65,12 @@ bytes through Kotlin memory.
falls back to an exclusive rename (`renameat2(RENAME_NOREPLACE)` /
`renamex_np(RENAME_EXCL)`). Failure or cancellation removes the temporary
file. Stale VniDrop temporary files are cleaned on later writes.
- Android defaults to the app-specific external Downloads directory
(`getExternalFilesDir`), which is always writable by the process. Shared
system folders require a SAF tree URI via the folder picker; those receives
stream through `ReceiveOutputSink` instead of raw filesystem paths.
- Android defaults to the shared system Downloads collection via MediaStore
(`ReceiveFolderKind.AndroidPublicDownloads` on API 29+). Files show up in the
user's Downloads UI like a browser download. Custom folders still use a SAF
tree URI from the folder picker. Both Android sinks stream through
`ReceiveOutputSink` instead of raw filesystem paths. Pre-Android 10 falls
back to the public Downloads path with legacy storage permission.
- Foreign output sinks receive exactly one terminal callback after a successful
`start_file`: `finish_file` or `abort_file`.