file-manager/CHANGELOG.md

Changelog

All notable changes to File Manager are documented in this file.

The format follows Keep a Changelog, and the project uses Semantic Versioning.

versionCode and versionName are defined in app/build.gradle.kts. Each Play upload needs a higher versionCode than every previous upload.

[Unreleased]

Fixed

• .xz extraction would have crashed on a real device. Commons Compress declares its LZMA/LZMA2 support — the .xz compressor and the 7z format — against org.tukaani:xz as an optional dependency. Optional means it is not pulled in transitively, so nothing warned at build time, and the app went on advertising .xz as extractable. The first user to open one would have got NoClassDefFoundError: org/tukaani/xz/FilterOptions. The library is now declared, and a round-trip test covers the path that was silently missing.

• The storage-usage screen stayed blank for ~45–60 s on a real 55 GB volume, which reads as a hang even though the work was off the main thread. UsageAnalysis now passes the FileEntry down the recursion instead of re-stating every node — the parent's listing already says whether each child is a folder — so the walk costs one listing per directory. It also reports each child through an onProgress callback, and the ViewModel appends and re-sorts as they arrive, so the largest folders appear while the rest of the tree is still being measured. Found by running the app on a real phone.

• Misleading first-run copy. The permission prompt said "Full access was declined" on a device where the user had never declined anything. Reworded so it is true whether access was declined or simply never granted.

• The details sheet put untranslatable English on screen. It rendered FileKind.name directly, so "Type" read directory, archive, apk — enum constants rather than labels, and impossible to translate. Every category now has a string resource and a FileKind.labelRes() mapping alongside the existing OperationKind.titleRes().

Added

• Undo for delete, rename and move. A delete is now a move into a hidden .plainfiles-trash folder on the same volume rather than a removal, so the snackbar can offer to put it back; a rename and a pasted cut record how to reverse themselves. Four deliberate limits, all carried in domain/Trash: the trash sits on the user's own volume, so it counts against their free space until it expires (24 hours, purged opportunistically so there is no startup hook to forget and no "empty trash" chore); a name taken again in the meantime is never overwritten, so an item returns beside it under a free name; a delete that went through Android's own dialog is not staged, because the system owns that one and its trash with it; and when a pasted move's landing names cannot be established with confidence, no undo is offered at all rather than risking putting the wrong file back. The undo handle is cleared the moment it is used, so a second tap cannot replay it.

• Keep the browsed folder and view settings across process death. SavedStateHandle carries the folder plus the sort key, direction, view mode and hidden-files setting. The search query, the selection and the clipboard are deliberately not restored — a restored query would hide the folder's contents on launch with no visible cause, and a paste that survived a reboot would be a nasty surprise.

• 7z extraction. Commons Compress already contained a pure-Java 7z reader (SevenZFile), so this needed no new native code and no library beyond the XZ one the .xz fix above required — the docs had simply assumed the format was off-limits and said so in two places. The one real constraint is that 7z is the only format here that cannot arrive through a stream: its header sits at the end of the file, so the reader has to seek. That is now a capability the backend can advertise, StorageSource.openSeekable: the all-files backend answers with a real FileChannel, and the SAF fallback answers null, so a 7z in folder mode is refused with "needs a seekable file, which this storage mode cannot provide" rather than failing obscurely. Entry names go through the same ArchivePath.safeRelativePath zip-slip guard as every other format, with a test that plants ../evil.txt in a real 7z and asserts it lands nowhere. 7z creation stays deferred, so ZIP is still the only writable format.

• A two-pane layout for large screens. A window at or above Material's "expanded" breakpoint — 840 dp, which a 10-inch tablet in landscape at 1280 dp clears — now splits into a master pane and a detail pane. Tapping a row highlights it, and the second pane answers "what is in there?" without a navigation step: a folder's children, or a preview plus the metadata for a file. Opening therefore moves to a double tap on wide windows only, because once there is somewhere to show a selection a single tap has to mean "show me"; phone (~411 dp) and 7-inch-portrait (~600 dp) windows keep the layout and the tap behaviour they already had. The root screen previews the main volume on arrival rather than leaving the second pane empty.

  Found while taking the tablet screenshots, where it turned out the app had no large-screen layout at all: on a 2560×1600 canvas every row was 2560 px wide with its content stranded in the left ~240 px.

• M10 — store assets. The app is named Plain Files (one string; the applicationId was already locked in M0). tools/make-store-assets.sh renders the 512×512 RGBA icon and the 1024×500 RGB feature graphic from the app's own icon vectors, so the store icon is the launcher icon rather than a lookalike that drifts after the next rebrand. tools/make-store-screenshots.sh normalises adb captures to Play's 2:1 limit per form factor — a phone at its native 1080×2400 is 2.22:1 and would be rejected outright. docs/STORE_LISTING.md has the ready-to-paste copy, length-checked against Play's limits, plus the permissions paragraph that the MANAGE_EXTERNAL_STORAGE declaration requires. The feature graphic's copy was verified to survive Play's centre-square crop by cropping the rendered PNG, not by trusting the arithmetic.

  Screenshots: 5 phone shots at 1080×2160, 4 on a 7-inch tablet at 1200×1920 and 4 on a 10-inch tablet at 2560×1600 — all 24-bit RGB with no alpha, inside Play's 2:1 cap. The tablet sets come from AOSP AVDs, because there was no tablet hardware to hand. The generator now measures every capture and refuses to normalise a blank one: a headless AVD that has not composed the app's first frame still draws its system bars, so a pure-background capture is not obviously empty — and one had already been committed before the check existed.

• M9 — monetisation. Decided: a one-time paid app at €4.49, with a 14-day launch price of €2.29, both set in the Play Console. No ads, no subscription and no in-app purchases — which means no Billing client, no com.android.vending.BILLING permission and no purchase code in the APK at all; the price lives on the listing, not in the build. That is what keeps the "no network permission, nothing leaves your device" claim true of the shipped artefact rather than just the source. The rationale, the market anchors and the rejected alternatives are in docs/MONETISATION.md. Verified against the rebuilt release APK: zero billing references, zero INTERNET, and the debug-only pseudo-locale correctly absent.

• M8 — localisation groundwork. Every user-visible string lives in res/values/strings.xml with real <plurals>, and an audit of the Compose sources found exactly one genuine miss (above). The debug build type enables isPseudoLocalesEnabled, so running it in English (XA) renders resource-backed text accented and bracketed while anything hardcoded looks normal — a mechanical way to catch the next one. Confirmed the pseudo-locale reaches the debug APK and not the release. Byte units and the timestamp pattern stay unlocalised on purpose, documented in the README along with the pseudo-locale check.

• M7 — on-device validation. The app was run on a real Xiaomi M2101K7AG (Android 12, MIUI V140) rather than only emulator images. Verified on hardware: the first-run permission prompt, "All files access" granted while the app is alive (picked up on resume), browsing real storage, the text editor's read and write path (the write checked independently with adb shell cat), the storage-usage screen, landscape layout, and graceful degradation when access is revoked mid-use. The findings live in docs/EDGE_CASE_TESTING.md, including what could not be driven from the host — long-press multi-select is delivered as a plain tap by this MIUI build, so the compress/extract buttons still want a manual pass.

• M6 — release config and Play readiness. An upload keystore (4096-bit RSA, CN=Hadrian Burkhardt, L=Potsdam, C=DE) is generated and wired through the git-ignored keystore.properties, so bundleRelease produces a signed, R8-minified, resource-shrunk .aab (4 682 814 bytes) and assembleRelease a signed APK. docs/PLAY_RELEASE_CHECKLIST.md walks the Play Console work, with step 4 covering the Permissions Declaration Form for "All files access" — the declaration a file manager must make, and the one that can block a release. PRIVACY.md is written to match the shipped permissions: no collection, no sharing, no INTERNET. The shipped permission set is audited from the release APK.

• M5 — analysis, archives and viewers. domain/UsageAnalysis rolls up recursive folder sizes and finds the largest files below a folder, which the new storage-usage screen shows as a size and a share bar per row. domain/ArchiveEngine creates ZIP archives and extracts ZIP, TAR, TAR.GZ, GZ, BZ2 and XZ using java.util.zip and Commons Compress — all pure Java, so the app still ships no native code; RAR and 7z are recognised and refused with a clear message rather than half-supported. Every archive entry name is passed through core/ArchivePath before it becomes a path, so a crafted ../ entry cannot write outside the destination. The browser gains Coil thumbnails in the list and grid, a built-in image viewer and text editor, and compress/extract actions. 26 new JVM tests (141 total), including a zip-slip archive that is refused while the same archive's safe entry still extracts.

• M4 — the browser UI. The app is now usable end to end. StorageLocation (with a real StorageProvider and a fake for tests) decides which backend is in effect; BrowserViewModel owns navigation, sorting, hidden files, list/grid, search, selection and the clipboard, and turns an ASK conflict into a prompt rather than a guess. The screen offers roots and folder lists with breadcrumbs, a details sheet, new-folder / rename / delete / conflict dialogs, and the "All files access" and SAF-folder prompts — including an upgrade banner so declining full access never blocks browsing. Deletes go through the platform's own confirmation when MediaStore can build one and fall back to a direct delete otherwise; a FileProvider lets other apps open and receive files without a file:// URI ever leaving the process. 16 new JVM tests (115 total).

• M3 — operations engine and foreground service. domain/FileOperations turns the backend primitives into copy, move, delete and rename: it walks folders, counts the work up front so the progress bar has an honest denominator, checks for cancellation between entries (never swallowing CancellationException), and reports per-item failures instead of abandoning a batch because one file was unreadable. Conflicts are resolved through the M1 TransferPlanner — ASK is deliberately surfaced to the caller so the UI can prompt. A move tries the backend's atomic rename first and only falls back to copy-then-delete when the backend cannot do it (the SAF path across directories); the source is never deleted when its copy failed. service/FileOpService is a dataSync foreground service that mirrors the engine's progress into an ongoing notification, so a long operation survives the app being backgrounded. 23 new JVM tests (99 total), including Robolectric coverage of the notification and the service entering the foreground.

• M2 — storage layer. The two storage backends behind one interface. AllFilesSource is java.io.File over every mounted volume (the "All files access" path); SafSource is the Storage Access Framework fallback, reading a persisted tree URI through DocumentsContract with SafDocumentIds doing the tree↔path mapping and SafGrant owning the folder picker and its persistence. VolumeRepository enumerates volumes via StorageManager/StorageVolume and reports free/total space through StatFs; StorageAccess and StorageAccessPolicy decide between the two backends. Both sources confine their blocking I/O to Dispatchers.IO and expose a suspend contract. 32 new JVM tests (76 total), including a Robolectric run of SafSource against a stand-in DocumentsProvider.

• M1 — pure-Kotlin core engine. An Android-free core/ package holding the logic every other layer builds on: StoragePath (normalised absolute paths that can never escape the root), FileEntry with extension-based FileKind classification and a MimeTypes lookup for "open with", natural-order SortSpec (directories always first, file2 before file10), human-readable FileSize, NameMatcher (case-insensitive substring plus */? globs), NameAllocator ("name (1)") and TransferPlanner (conflict policies and move-into-self detection). Covered by 44 JVM unit tests across 10 classes.

• M0 — project scaffold. Gradle 9.3.1 / AGP 9.1.0 build with a version catalog, de.softwareapp_hb.filemanager app module, a Compose Material 3 shell with the branded blue theme (dynamic colour on Android 12+), an adaptive launcher icon, and the storage-access permission set (all files access + SAF fallback). Debug APK builds, installs and runs on an AOSP Android 12 AVD.