Many imorovments

apps/darkroom-android/Cargo.toml

@@ -16,6 +16,9 @@ crate-type = ["cdylib"]
 # No backend feature to select: dr-ui picks its Slint backend from the target,
 # so building for aarch64-linux-android gets android-activity automatically.
 dr-ui.workspace = true
+# For `session::set_data_dir`: only the platform entry point knows where Android
+# lets this app keep files, and it must be set before any store is opened.
+dr-sync-nextcloud.workspace = true
 # Directly, not just through dr-ui: `android_main` takes an `AndroidApp` and
 # calls `slint::android::init`, both of which come from this crate. The backend
 # feature comes from dr-ui's target-specific dependency.

apps/darkroom-android/android/AndroidManifest.xml

@@ -4,9 +4,9 @@
 
   Deliberately minimal: this packages the viewer for on-device testing (spike
   S2 needs Adreno and Mali hardware, which no emulator represents). Nothing
-  here is a distribution manifest yet — no permissions are declared because
-  the library grid reads through SAF, which grants per-tree rather than by
-  manifest permission (ARCH §6.9).
+  here is a distribution manifest yet. Only network access is declared: file
+  access needs no manifest permission because the library grid reads through
+  SAF, which grants per-tree at runtime (ARCH §6.9).
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="paris.tourolle.darkroom">

apps/darkroom-android/src/lib.rs

@@ -34,6 +34,20 @@ fn android_main(app: slint::android::AndroidApp) {
 
     log::info!("DarkRoom v{}", env!("CARGO_PKG_VERSION"));
 
+    // Before anything opens a store: Android has no $HOME and no XDG
+    // directories, so the default guess resolves to a path the app cannot
+    // write. Nothing failed loudly — the session list went to a doomed path, so
+    // the account survived only as long as the process and backgrounding the app
+    // lost the sign-in. `internal_data_path` is the app's private directory
+    // (ARCH §6.9).
+    match app.internal_data_path() {
+        Some(dir) => {
+            log::info!("data dir: {}", dir.display());
+            dr_sync_nextcloud::session::set_data_dir(dir);
+        }
+        None => log::error!("no internal data path; settings will not persist"),
+    }
+
     if let Err(e) = slint::android::init(app) {
         log::error!("Slint Android backend failed to initialise: {e}");
         return;