Give Backup & restore its loading and failure states (#304)

The screen derived its rows straight from the calendar list, which starts
empty, catches to empty on a provider error, and can legitimately load with
nothing exportable and nothing importable. All three rendered as a blank
page with no way to import anything.

Adds BackupUiState (Loading / Failure / Ready) and keeps the restore row on
screen whenever the screen has anything at all to show: when no calendar can
receive events it says so and routes to the calendar manager instead of
disappearing. New FailureReason.NoImportTarget covers the case the list
itself can't explain -- calendars exist and are visible, but every one is
read-only, managed or not synced.

Export stays available on an all-hidden device: it reads the provider
directly, so calling that a failure would hide a working action.

Also adds an import test against a Google Calendar export dialect
(VTIMEZONE, TZID-qualified DTSTART/EXDATE, folded lines, RECURRENCE-ID
overrides) -- the parser already handles all of it.

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.20.4] — 2026-09-20
+
+### Fixed
+- **The app no longer reopens the event you last came in on.** Opening an event
+  from a reminder or a home-screen widget made the app return to that same
+  event on every later launch — and show an error screen once the event had
+  been deleted. Android hands an app the launch it was started with again each
+  time it is rebuilt, and Calendula was acting on it every time instead of
+  once ([#309]).
+- **"Today" works in the agenda again.** Scrolling a few days ahead and tapping
+  today did nothing, because the agenda is browsed by scrolling rather than by
+  moving its date, and the button only moved the date. It now brings the list
+  back to today, and it stays offered while the list is scrolled away — before,
+  it was hidden in exactly the situation it is for ([#305]).
+- **Calendula is filed under "Calendar & Agenda" in the self-hosted repo.**
+  Browsing by category in an F-Droid client set to prefer that repo listed the
+  app under "Time" instead ([#294]).
+
 ## [2.20.3] — 2026-09-12
 
 ### Fixed
@@ -1693,3 +1711,6 @@ automatically, with zero telemetry and no internet permission.
 [#239]: https://codeberg.org/jlmakiola/calendula/issues/239
 [#297]: https://codeberg.org/jlmakiola/calendula/issues/297
 [#298]: https://codeberg.org/jlmakiola/calendula/issues/298
+[#309]: https://codeberg.org/jlmakiola/calendula/issues/309
+[#305]: https://codeberg.org/jlmakiola/calendula/issues/305
+[#294]: https://codeberg.org/jlmakiola/calendula/issues/294

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // which builds this version and then creates the matching vX.Y.Z tag +
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 2.7.2 -> 20702). See docs/RELEASING.md.
-        versionCode = 22003
-        versionName = "2.20.3"
+        versionCode = 22004
+        versionName = "2.20.4"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -113,11 +113,26 @@ class MainActivity : AppCompatActivity() {
         systemBarsDark = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK ==
             Configuration.UI_MODE_NIGHT_YES
         applyEdgeToEdge()
-        requestedDetailKey = intent.detailKeyOrNull() ?: intent.viewEventKeyOrNull()
+        // Android hands the intent that started the task back to onCreate every
+        // time the activity is recreated — on a rotation, or on a restart after
+        // the system reclaimed the process. Re-running a launch that opens one
+        // specific event is what made a single reminder or widget tap re-open
+        // that event on every later launch, an error screen once the event had
+        // been deleted (#309); the user left it long ago, and the activity
+        // restores where they actually were along with its saved state.
+        //
+        // Only those channels are held back. An .ics import or a prefilled
+        // create form keeps no saved state of its own, so re-reading the intent
+        // is what carries one through a recreation.
+        val replaying = savedInstanceState != null || intent.isRelaunch()
+        if (!replaying) {
+            requestedDetailKey = intent.detailKeyOrNull() ?: intent.viewEventKeyOrNull()
+            requestedEditKey = intent.editEventKeyOrNull()
+        }
         requestedNav = intent.navRequestOrNull()
+            ?.takeUnless { replaying && it is WidgetNavRequest.OpenEvent }
         requestedImportUri = intent.importUriOrNull()
         requestedInsert = intent.insertRequestOrNull()
-        requestedEditKey = intent.editEventKeyOrNull()
         if (CrashReporter.shouldPrompt(this)) pendingCrashReport = CrashReporter.pendingReport(this)
         setContent {
             // One activity-scoped SettingsViewModel drives both the theme here
@@ -242,6 +257,16 @@ class MainActivity : AppCompatActivity() {
         intent.editEventKeyOrNull()?.let { requestedEditKey = it }
     }
 
+    /**
+     * Whether this launch is the task being resumed rather than a fresh
+     * delivery — Android sets the flag when an activity is started from the
+     * recents list, where the intent it carries is the one the task was started
+     * with however long ago. `onNewIntent` is the channel a real new request
+     * arrives on while the task lives, so nothing is lost by ignoring these.
+     */
+    private fun Intent.isRelaunch(): Boolean =
+        flags and Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY != 0
+
     /**
      * The `.ics` Uri an external app asked us to open (file manager `ACTION_VIEW`)
      * or share into us (`ACTION_SEND`). Restricted to content/file schemes so the

app/src/main/java/de/jeanlucmakiola/calendula/domain/Models.kt

@@ -253,6 +253,13 @@ enum class FailureReason {
     PermissionRevoked,
     NoCalendarsConfigured,
     AllCalendarsHidden,
+
+    /**
+     * Calendars exist and are switched on, but none can receive an event: every
+     * one is read-only, app-managed, or not synced to this device. Distinct from
+     * [AllCalendarsHidden], which a visibility switch fixes.
+     */
+    NoImportTarget,
     ProviderUnavailable,
     EventNotFound,
     Unknown,

app/src/main/java/de/jeanlucmakiola/calendula/ui/CalendarHost.kt

@@ -550,18 +550,24 @@ fun CalendarHost(
             enter = slideInHorizontally(slideSpec) { it } + fadeIn(),
             exit = slideOutHorizontally(slideSpec) { it } + fadeOut(),
         ) {
-            BackupScreen(
-                onBack = { showBackup = false },
-                // Restore runs the normal .ics import, and both this screen and
-                // the manager that can have opened it are declared above the
-                // import overlays — so both have to step aside.
-                onImport = {
-                    importUri = it
-                    importForceMany = true
-                    showBackup = false
-                    showCalendars = false
-                },
-            )
+            // The manager sits directly under this screen, so its failure states'
+            // "Manage calendars" way out is simply popping back to it (#304).
+            CompositionLocalProvider(
+                LocalManageCalendars provides { showBackup = false },
+            ) {
+                BackupScreen(
+                    onBack = { showBackup = false },
+                    // Restore runs the normal .ics import, and both this screen
+                    // and the manager that can have opened it are declared above
+                    // the import overlays — so both have to step aside.
+                    onImport = {
+                        importUri = it
+                        importForceMany = true
+                        showBackup = false
+                        showCalendars = false
+                    },
+                )
+            }
         }
     }
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaScreen.kt

@@ -13,7 +13,9 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Coffee
 import androidx.compose.material.icons.filled.Menu
@@ -32,6 +34,8 @@ import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -106,6 +110,27 @@ fun AgendaScreen(
     }
     val successState = state as? AgendaUiState.Success
 
+    // The agenda window always starts at the anchor, so moving through it is a
+    // list scroll, not an anchor change — "today" has to bring the list back to
+    // the top as well, and stay offered while it is scrolled away (#305).
+    val listState = rememberLazyListState()
+    val scrolledAway by remember {
+        derivedStateOf {
+            listState.firstVisibleItemIndex > 0 || listState.firstVisibleItemScrollOffset > 0
+        }
+    }
+    // A new window is rendered from its first day, so the list belongs at the
+    // top. Keyed on the anchor the days arrived with, not the one just
+    // requested: scrolling before the new rows compose leaves the list keyed to
+    // a row that reappears further down, and it follows it there.
+    LaunchedEffect(successState?.anchor) { listState.scrollToItem(0) }
+    val jumpToToday = {
+        // Off today, moving the anchor is what resets the list (above); on today
+        // the window doesn't change, so the scroll back is the whole action.
+        if (isOnToday) scope.launch { listState.animateScrollToItem(0) }
+        viewModel.goToToday()
+    }
+
     ModalNavigationDrawer(
         drawerState = drawerState,
         drawerContent = {
@@ -139,14 +164,15 @@ fun AgendaScreen(
                     onOpenDrawer = { scope.launch { drawerState.open() } },
                     onOpenSearch = onOpenSearch,
                     showTodayButton = todayInToolbar,
-                    onToday = viewModel::goToToday,
+                    onToday = jumpToToday,
                 )
             },
             floatingActionButton = {
                 CalendarFabColumn(
-                    todayVisible = !isOnToday && !todayInToolbar,
+                    todayVisible = (!isOnToday || (scrolledAway && successState != null)) &&
+                        !todayInToolbar,
                     todayText = stringResource(R.string.agenda_today_action),
-                    onToday = viewModel::goToToday,
+                    onToday = jumpToToday,
                     onCreate = { onCreateEvent(anchor, null) },
                 )
             },
@@ -195,6 +221,7 @@ fun AgendaScreen(
                     state = state,
                     pastDisplay = pastDisplay,
                     showToday = showToday,
+                    listState = listState,
                     onRetry = viewModel::goToToday,
                     onEventClick = onEventClick,
                     onOpenDay = onOpenDay,
@@ -298,6 +325,7 @@ internal fun AgendaContent(
     onEventClick: (EventInstance) -> Unit,
     onOpenDay: (LocalDate) -> Unit,
     modifier: Modifier = Modifier,
+    listState: LazyListState = rememberLazyListState(),
 ) {
     when (state) {
         AgendaUiState.Loading -> Box(modifier)
@@ -326,12 +354,16 @@ internal fun AgendaContent(
                 enabled = showToday && state.anchor == state.today,
             )
             if (days.isEmpty()) {
+                // Nothing to scroll: drop the position a previous list left, so
+                // the today FAB doesn't linger over an empty screen.
+                LaunchedEffect(Unit) { listState.scrollToItem(0) }
                 AgendaEmpty(modifier)
             } else {
                 AgendaList(
                     days = days,
                     today = state.today,
                     zone = state.zone,
+                    listState = listState,
                     dimPast = pastDisplay == PastEventDisplay.DIM,
                     now = now,
                     onEventClick = onEventClick,
@@ -349,6 +381,7 @@ private fun AgendaList(
     days: List<AgendaDay>,
     today: LocalDate,
     zone: TimeZone,
+    listState: LazyListState,
     dimPast: Boolean,
     now: Instant,
     onEventClick: (EventInstance) -> Unit,
@@ -357,6 +390,7 @@ private fun AgendaList(
 ) {
     LazyColumn(
         modifier = modifier,
+        state = listState,
         // Bottom inset clears the FAB stack so the last row stays tappable.
         contentPadding = PaddingValues(top = 8.dp, bottom = 96.dp),
     ) {

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/BackupScreen.kt

@@ -4,6 +4,7 @@ import android.net.Uri
 import android.text.format.DateUtils
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
@@ -18,6 +19,7 @@ import androidx.compose.material.icons.filled.Schedule
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Button
 import androidx.compose.material3.Checkbox
+import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
@@ -47,9 +49,10 @@ import de.jeanlucmakiola.calendula.R
 import de.jeanlucmakiola.calendula.data.prefs.BackupStatus
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
-import de.jeanlucmakiola.calendula.domain.isEventTarget
 import de.jeanlucmakiola.calendula.ui.common.CalendarColorChip
+import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.LeadingAvatar
+import de.jeanlucmakiola.calendula.ui.common.LocalManageCalendars
 import de.jeanlucmakiola.floret.components.CollapsingScaffold
 import de.jeanlucmakiola.floret.components.DialogAmountField
 import de.jeanlucmakiola.floret.components.DialogUnitDropdown
@@ -80,18 +83,13 @@ fun BackupScreen(
     onImport: (Uri) -> Unit,
     viewModel: CalendarsViewModel = hiltViewModel(),
 ) {
-    val calendars by viewModel.calendars.collectAsStateWithLifecycle()
+    val state by viewModel.backupState.collectAsStateWithLifecycle()
     val backupResult by viewModel.backupResult.collectAsStateWithLifecycle()
     val autoBackup by viewModel.autoBackup.collectAsStateWithLifecycle()
 
     val context = LocalContext.current
     val snackbarHostState = remember { SnackbarHostState() }
 
-    // Export covers local calendars only; managed special-dates mirrors are
-    // rebuilt from contacts. Restore can target anything the import picker offers.
-    val exportable = calendars.filter { it.isLocal && it.canModifyContents && !it.isManaged }
-    val canImport = calendars.any { it.isEventTarget }
-
     // Exports everything eligible (null); the per-calendar selector owns its
     // own launcher.
     val createBackup = rememberLauncherForActivityResult(
@@ -135,75 +133,35 @@ fun BackupScreen(
         snackbarHost = { SnackbarHost(snackbarHostState) },
         predictiveBack = true,
     ) {
-        HintText(stringResource(R.string.calendars_backup_hint))
-
-        if (exportable.isNotEmpty()) {
-            GroupedRow(
-                title = stringResource(R.string.calendars_backup_action),
-                position = Position.Top,
-                leading = { LeadingAvatar(Icons.Default.FileDownload) },
-                onClick = {
-                    // A single exportable calendar skips the selector.
-                    if (exportable.size == 1) {
-                        runCatching { createBackup.launch("calendula-backup-${LocalDate.now()}.ics") }
-                    } else {
-                        showExportPicker = true
-                    }
+        when (val s = state) {
+            BackupUiState.Loading -> BackupLoading()
+            is BackupUiState.Failure -> CalendarFailure(reason = s.reason, onRetry = onBack)
+            is BackupUiState.Ready -> BackupContent(
+                exportable = s.exportable,
+                canImport = s.canImport,
+                autoBackup = autoBackup,
+                viewModel = viewModel,
+                onRestore = { runCatching { openBackup.launch(RESTORE_MIME_TYPES) } },
+                onPickFolder = { runCatching { pickFolder.launch(null) } },
+                onExportAll = {
+                    runCatching { createBackup.launch(defaultBackupName()) }
                 },
-            )
-            GroupedRow(
-                title = stringResource(R.string.calendars_restore_action),
-                summary = stringResource(R.string.calendars_restore_hint),
-                position = Position.Middle,
-                leading = { LeadingAvatar(Icons.Default.FileUpload) },
-                onClick = { runCatching { openBackup.launch(RESTORE_MIME_TYPES) } },
-            )
-            GroupedRow(
-                title = stringResource(R.string.calendars_auto_backup),
-                summary = stringResource(R.string.calendars_auto_backup_hint),
-                position = if (autoBackup.enabled) Position.Middle else Position.Bottom,
-                leading = { LeadingAvatar(Icons.Default.Schedule) },
-                trailing = {
-                    Switch(checked = autoBackup.enabled, onCheckedChange = viewModel::setAutoBackupEnabled)
-                },
-                onClick = { viewModel.setAutoBackupEnabled(!autoBackup.enabled) },
-            )
-            if (autoBackup.enabled) {
-                GroupedRow(
-                    title = stringResource(R.string.calendars_auto_backup_folder),
-                    summary = rememberFolderName(autoBackup.folderUri)
-                        ?: stringResource(R.string.calendars_auto_backup_folder_unset),
-                    position = Position.Middle,
-                    onClick = { runCatching { pickFolder.launch(null) } },
-                )
-                GroupedRow(
-                    title = stringResource(R.string.calendars_auto_backup_interval),
-                    summary = backupIntervalLabel(autoBackup.intervalMinutes),
-                    position = Position.Bottom,
-                    onClick = { showInterval = true },
-                )
-                HintText(backupStatusText(autoBackup.status))
-            }
-        } else if (canImport) {
-            // Nothing to back up, but restore is still possible — don't hide
-            // it behind export eligibility.
-            SectionHeader(stringResource(R.string.calendars_restore_header))
-            HintText(stringResource(R.string.calendars_restore_hint))
-            GroupedRow(
-                title = stringResource(R.string.calendars_restore_action),
-                position = Position.Alone,
-                leading = { LeadingAvatar(Icons.Default.FileUpload) },
-                onClick = { runCatching { openBackup.launch(RESTORE_MIME_TYPES) } },
+                onExportPick = { showExportPicker = true },
+                onEditInterval = { showInterval = true },
             )
         }
     }
 
-    if (showExportPicker) {
-        ExportCalendarPicker(
-            calendars = exportable,
-            onExport = viewModel::exportBackup,
-            onDismiss = { showExportPicker = false },
-        )
+    // Gated on Ready rather than resetting the flag when the state leaves it:
+    // flipping it here would be a write during composition.
+    (state as? BackupUiState.Ready)?.let { ready ->
+        if (showExportPicker) {
+            ExportCalendarPicker(
+                calendars = ready.exportable,
+                onExport = viewModel::exportBackup,
+                onDismiss = { showExportPicker = false },
+            )
+        }
     }
     if (showInterval) {
         BackupIntervalDialog(
@@ -214,6 +172,105 @@ fun BackupScreen(
     }
 }
 
+/** The screen's one-line loading state, in the scaffold's content column. */
+@Composable
+private fun BackupLoading() {
+    Box(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(vertical = 48.dp),
+        contentAlignment = Alignment.Center,
+    ) {
+        CircularProgressIndicator()
+    }
+}
+
+/** Default file name for a one-shot export. */
+private fun defaultBackupName(): String = "calendula-backup-${LocalDate.now()}.ics"
+
+/**
+ * The working screen: export (when there are local calendars to export), restore,
+ * and the automatic-backup block. Restore is always on screen — when nothing can
+ * receive the events it says so and routes to the calendar manager rather than
+ * disappearing, which is what #304 reported as an invisible button.
+ */
+@Composable
+private fun BackupContent(
+    exportable: List<CalendarSource>,
+    canImport: Boolean,
+    autoBackup: AutoBackupUiState,
+    viewModel: CalendarsViewModel,
+    onRestore: () -> Unit,
+    onPickFolder: () -> Unit,
+    onExportAll: () -> Unit,
+    onExportPick: () -> Unit,
+    onEditInterval: () -> Unit,
+) {
+    val manageCalendars = LocalManageCalendars.current
+    // Restore never depends on export eligibility, and never disappears: when no
+    // calendar can receive events it explains that and offers the way to fix it.
+    val restoreSummary = if (canImport) {
+        stringResource(R.string.calendars_restore_hint)
+    } else {
+        stringResource(R.string.calendars_restore_unavailable)
+    }
+    val onRestoreClick = if (canImport) onRestore else (manageCalendars ?: onRestore)
+
+    if (exportable.isEmpty()) {
+        SectionHeader(stringResource(R.string.calendars_restore_header))
+        HintText(restoreSummary)
+        GroupedRow(
+            title = stringResource(R.string.calendars_restore_action),
+            position = Position.Alone,
+            leading = { LeadingAvatar(Icons.Default.FileUpload) },
+            onClick = onRestoreClick,
+        )
+        return
+    }
+
+    HintText(stringResource(R.string.calendars_backup_hint))
+    GroupedRow(
+        title = stringResource(R.string.calendars_backup_action),
+        position = Position.Top,
+        leading = { LeadingAvatar(Icons.Default.FileDownload) },
+        // A single exportable calendar skips the selector.
+        onClick = if (exportable.size == 1) onExportAll else onExportPick,
+    )
+    GroupedRow(
+        title = stringResource(R.string.calendars_restore_action),
+        summary = restoreSummary,
+        position = Position.Middle,
+        leading = { LeadingAvatar(Icons.Default.FileUpload) },
+        onClick = onRestoreClick,
+    )
+    GroupedRow(
+        title = stringResource(R.string.calendars_auto_backup),
+        summary = stringResource(R.string.calendars_auto_backup_hint),
+        position = if (autoBackup.enabled) Position.Middle else Position.Bottom,
+        leading = { LeadingAvatar(Icons.Default.Schedule) },
+        trailing = {
+            Switch(checked = autoBackup.enabled, onCheckedChange = viewModel::setAutoBackupEnabled)
+        },
+        onClick = { viewModel.setAutoBackupEnabled(!autoBackup.enabled) },
+    )
+    if (autoBackup.enabled) {
+        GroupedRow(
+            title = stringResource(R.string.calendars_auto_backup_folder),
+            summary = rememberFolderName(autoBackup.folderUri)
+                ?: stringResource(R.string.calendars_auto_backup_folder_unset),
+            position = Position.Middle,
+            onClick = onPickFolder,
+        )
+        GroupedRow(
+            title = stringResource(R.string.calendars_auto_backup_interval),
+            summary = backupIntervalLabel(autoBackup.intervalMinutes),
+            position = Position.Bottom,
+            onClick = onEditInterval,
+        )
+        HintText(backupStatusText(autoBackup.status))
+    }
+}
+
 /**
  * Choose which local calendars to include in a one-time `.ics` export. Defaults
  * to all selected; the Export action opens the SAF save dialog and hands back

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/BackupUiState.kt

@@ -0,0 +1,53 @@
+package de.jeanlucmakiola.calendula.ui.calendars
+
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.FailureReason
+import de.jeanlucmakiola.calendula.domain.calendarListFailure
+import de.jeanlucmakiola.calendula.domain.isEventTarget
+
+/**
+ * State of the Backup & restore screen (#69). Three states, because the calendar
+ * list it is derived from has all three: it arrives empty, it can throw, and
+ * "loaded but nothing to offer" is a real outcome the screen used to render as a
+ * blank page (#304).
+ */
+sealed interface BackupUiState {
+    data object Loading : BackupUiState
+    data class Failure(val reason: FailureReason) : BackupUiState
+
+    /**
+     * At least one half of the screen works. [exportable] may be empty (restore
+     * only) and [canImport] may be false (export only), but never both — that is
+     * a [Failure].
+     */
+    data class Ready(
+        val exportable: List<CalendarSource>,
+        val canImport: Boolean,
+    ) : BackupUiState
+}
+
+/**
+ * What the screen can offer for this calendar list.
+ *
+ * Export covers the app's own local calendars; managed special-dates mirrors are
+ * rebuilt from contacts, so they are excluded. Restore can target anything the
+ * import picker offers ([isEventTarget]).
+ *
+ * A failure is raised only when *neither* is possible — deliberately not
+ * [calendarListFailure] on its own, which would call an all-hidden device a
+ * failure while its local calendars are still perfectly exportable. When both
+ * halves are dead the list itself usually says why (no calendars, everything
+ * switched off); [FailureReason.NoImportTarget] covers the remaining case, where
+ * calendars exist and are visible but every one of them is read-only, managed or
+ * not synced to the device.
+ */
+fun backupUiState(calendars: List<CalendarSource>): BackupUiState {
+    val exportable = calendars.filter { it.isLocal && it.canModifyContents && !it.isManaged }
+    val canImport = calendars.any { it.isEventTarget }
+    if (exportable.isEmpty() && !canImport) {
+        return BackupUiState.Failure(
+            calendarListFailure(calendars) ?: FailureReason.NoImportTarget,
+        )
+    }
+    return BackupUiState.Ready(exportable = exportable, canImport = canImport)
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/calendars/CalendarsViewModel.kt

@@ -14,6 +14,7 @@ import de.jeanlucmakiola.calendula.data.ics.IcsExporter
 import de.jeanlucmakiola.calendula.data.prefs.BackupStatus
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.FailureReason
 import de.jeanlucmakiola.calendula.domain.ics.IcsWriter
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -24,6 +25,7 @@ import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -56,6 +58,22 @@ class CalendarsViewModel @Inject constructor(
                 initialValue = emptyList(),
             )
 
+    /**
+     * The Backup & restore screen's own view of that list, with the loading and
+     * failure states [calendars] flattens away — it starts empty and catches to
+     * empty, which that screen used to render as a blank page (#304).
+     */
+    val backupState: StateFlow<BackupUiState> =
+        repository.calendars()
+            .map { backupUiState(it) }
+            .catch { emit(BackupUiState.Failure(FailureReason.ProviderUnavailable)) }
+            .flowOn(io)
+            .stateIn(
+                scope = viewModelScope,
+                started = SharingStarted.WhileSubscribed(5_000L),
+                initialValue = BackupUiState.Loading,
+            )
+
     /** Automatic-backup settings + last-run status, for the Backup section UI. */
     val autoBackup: StateFlow<AutoBackupUiState> = combine(
         settingsPrefs.autoBackupEnabled,

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/CalendarFailure.kt

@@ -36,6 +36,7 @@ fun CalendarFailure(reason: FailureReason, onRetry: () -> Unit) {
         FailureReason.PermissionRevoked -> R.string.state_failure_permission
         FailureReason.NoCalendarsConfigured -> R.string.state_failure_no_calendars
         FailureReason.AllCalendarsHidden -> R.string.state_failure_all_hidden
+        FailureReason.NoImportTarget -> R.string.state_failure_no_import_target
         FailureReason.ProviderUnavailable -> R.string.state_failure_provider
         FailureReason.Unknown,
         FailureReason.EventNotFound -> R.string.state_failure_unknown
@@ -43,6 +44,7 @@ fun CalendarFailure(reason: FailureReason, onRetry: () -> Unit) {
     val actionRes = when (reason) {
         FailureReason.NoCalendarsConfigured -> R.string.state_failure_no_calendars_action
         FailureReason.AllCalendarsHidden -> R.string.state_failure_all_hidden_action
+        FailureReason.NoImportTarget -> R.string.state_failure_all_hidden_action
         FailureReason.PermissionRevoked -> R.string.state_failure_permission_action
         else -> R.string.state_retry
     }
@@ -50,7 +52,9 @@ fun CalendarFailure(reason: FailureReason, onRetry: () -> Unit) {
         FailureReason.NoCalendarsConfigured -> {
             { context.startCalendarSetup() }
         }
-        FailureReason.AllCalendarsHidden -> manageCalendars ?: onRetry
+        FailureReason.AllCalendarsHidden,
+        FailureReason.NoImportTarget,
+        -> manageCalendars ?: onRetry
         else -> onRetry
     }
     Column(

app/src/main/res/values-cs/strings.xml

@@ -106,7 +106,7 @@
     <string name="event_edit_timezone_search">Vyhledat časové pásmo</string>
     <string name="event_edit_timezone_recent">Nedávné</string>
     <string name="event_edit_timezone_all">Všechna časová pásma</string>
-    <string name="event_edit_timezone_none">Žádné časové pásmo neodpovídá “%1$s”</string>
+    <string name="event_edit_timezone_none">Žádné časové pásmo neodpovídá „%1$s“</string>
     <string name="event_edit_timezone_local_time">%1$s vašeho času</string>
     <string name="event_edit_color">Barva</string>
     <string name="event_edit_color_default">Barva kalendáře</string>
@@ -115,7 +115,7 @@
     <string name="event_edit_color_unsupported">Pro tento kalendář není k dispozici</string>
     <string name="event_edit_color_unsupported_hint">Tento kalendář nemá žádnou sadu barev. Vlastní barvy kalendářů můžete povolit v nastavení.</string>
     <string name="event_edit_color_sync_warning">Tato barva může být během příští synchronizace kalendáře ztracena nebo přepsána.</string>
-    <string name="event_edit_conflict_title">Ke změně události došlo na jiném místě.</string>
+    <string name="event_edit_conflict_title">Ke změně události došlo na jiném místě</string>
     <string name="event_edit_conflict_body">Během úpravy došlo ke změně události — v rámci synchronizace nebo pomocí jiné aplikací. Co se má stát s vašimi změnami?</string>
     <string name="event_edit_conflict_overwrite">Uložit změny</string>
     <string name="event_edit_conflict_overwrite_hint">Pouze u upravených polí dojde k přepsání vnějšího zdroje</string>
@@ -169,7 +169,7 @@
     <string name="recurrence_every_n_months">Každý %1$d. měsíc</string>
     <string name="recurrence_every_n_years">Každý %1$d. rok</string>
     <string name="recurrence_on_days">%1$s v %2$s</string>
-    <string name="recurrence_with_until">%1$s do%2$s</string>
+    <string name="recurrence_with_until">%1$s do %2$s</string>
     <string name="recurrence_with_count">%1$s, %2$d opakování</string>
     <string name="event_detail_not_found">Tato událost již neexistuje.</string>
     <string name="event_attendee_accepted">Přijato</string>
@@ -190,7 +190,7 @@
     <string name="event_access_confidential_summary">Označeno jako utajené; záleží na daném účtu kalendáře, jak s tímto štítkem naloží</string>
     <string name="event_attendee_organizer">Pořadatel</string>
     <string name="event_attendee_optional">Volitelné</string>
-    <string name="event_attendee_resource">Zdroj</string>
+    <string name="event_attendee_resource">Prostředky</string>
     <string name="event_detail_self_response">Vaše odpověď: %1$s</string>
     <string name="reminder_at_time">V době konání události</string>
     <string name="reminder_default">Výchozí připomínka</string>
@@ -296,7 +296,7 @@
     <string name="search_back">Zpět</string>
     <string name="search_clear">Vymazat</string>
     <string name="search_idle_hint">Prohledávejte své události podle názvu, místa konání nebo poznámek.</string>
-    <string name="search_empty">Žádná událost neodpovídá “%1$s”.</string>
+    <string name="search_empty">Žádná událost neodpovídá „%1$s“.</string>
     <plurals name="search_selected_count">
         <item quantity="one">%d označený</item>
         <item quantity="few">%d označené</item>
@@ -409,7 +409,7 @@
     <string name="settings_widget_size_medium">Střední</string>
     <string name="settings_widget_size_large">Velký</string>
     <string name="settings_widget_size_extra_large">Největší</string>
-    <string name="settings_widget_size_summary">Text události%1$d</string>
+    <string name="settings_widget_size_summary">Text události %1$d</string>
     <string name="settings_agenda_show_today">Vždy zobrazovat dnešek</string>
     <string name="settings_agenda_show_today_hint">Ponechat dnešní den na prvním místě agendy a jejího widgetu, třebaže již nezbývá žádná nadcházející událost.</string>
     <string name="state_failure_all_hidden">Všechny vaše kalendáře jsou vypnuté.</string>
@@ -430,12 +430,12 @@
     <string name="settings_agenda_range_bar_hint">V horní části agendy se zobrazí lišta s rozsahem dat a tlačítkem pro změnu rozsahu dané relace</string>
     <string name="agenda_range_showing_label">Zobrazit všechny nadcházející události pro</string>
     <plurals name="agenda_range_days">
-        <item quantity="one">%dden</item>
-        <item quantity="few">%ddny</item>
-        <item quantity="many">%ddnů</item>
-        <item quantity="other">%ddnů</item>
+        <item quantity="one">%d den</item>
+        <item quantity="few">%d dny</item>
+        <item quantity="many">%d dnů</item>
+        <item quantity="other">%d dnů</item>
     </plurals>
-    <string name="settings_section_views">Pohledy</string>
+    <string name="settings_section_views">Zobrazení</string>
     <string name="settings_month_header">Měsíční zobrazení</string>
     <string name="settings_month_view_style">Styl měsíčního zobrazení</string>
     <string name="month_style_paged">Stránky</string>
@@ -485,4 +485,212 @@
     <string name="settings_reliable_delivery_exempt">Výloučení z optimalizace baterie – připomínky chodí bez prodlení.</string>
     <string name="settings_notifications_subtitle">Připomínky a doručení</string>
     <string name="settings_special_dates_reminders">Připomínky</string>
+    <string name="settings_reliable_delivery">Spolehlivé doručení</string>
+    <string name="settings_snooze_duration">Doba odložení</string>
+    <string name="settings_section_calendars">Kalendáře</string>
+    <string name="settings_manage_calendars">Správa kalendářů</string>
+    <string name="settings_manage_calendars_hint">Vytvářet místní kalendáře; spravovat synchronizované kalendáře</string>
+    <string name="settings_section_language">Jazyk</string>
+    <string name="settings_language">Jazyk aplikace</string>
+    <string name="settings_language_auto">Výchozí nastavení systému</string>
+    <string name="settings_translate">Pomozte s překladem</string>
+    <string name="settings_translate_hint">Přidat nebo vylepšit jazyk na Weblate</string>
+    <string name="settings_group_look">Vzhled a chování</string>
+    <string name="settings_group_data">Data</string>
+    <string name="settings_group_app">Aplikace</string>
+    <string name="settings_group_about">O aplikaci</string>
+    <string name="settings_appearance_subtitle">Motiv, barvy, písma</string>
+    <string name="settings_views_subtitle">Výchozí zobrazení, rozložení a pořadí</string>
+    <string name="settings_event_form_subtitle">Výchozí pole a chování</string>
+    <string name="settings_special_dates_subtitle">Narozeniny a výročí kontaktů</string>
+    <string name="settings_widgets_subtitle">Widget s agendou, dlaždice rychlého nastavení</string>
+    <string name="settings_backup_subtitle">Export, import, automatické zálohování</string>
+    <string name="settings_section_widgets">Widgety a dlaždice</string>
+    <string name="settings_widgets_hint">Nastavení widgetů na domovské obrazovce a dlaždice rychlého nastavení. Widget přidáte dlouhým stisknutím domovské obrazovky.</string>
+    <string name="settings_section_backup">Záloha a obnovení</string>
+    <string name="settings_views_all_header">Všechny pohledy</string>
+    <string name="settings_week_day_header">Týden a den</string>
+    <string name="settings_default_view_hint">Pohled, který se otevře při spuštění aplikace.</string>
+    <string name="settings_week_start_hint">Počáteční den týdne ve všech zobrazeních a widgetech.</string>
+    <string name="settings_time_format_hint">Způsob zápisu času v celé aplikaci. Funkce „Automaticky“ se řídí nastavením vašeho systému.</string>
+    <string name="settings_past_events_hint">Jak program zachází s událostmi, které již skončily.</string>
+    <string name="settings_dynamic_color_summary">Aplikace převezme barvy z vaší tapety.</string>
+    <string name="settings_section_special_dates">Speciální data kontaktů</string>
+    <string name="settings_special_dates_enable">Zobrazit data kontaktů</string>
+    <string name="settings_special_dates_enable_hint">Zkopírujte data narozenin a další data svých kontaktů do místních kalendářů. Aplikace čte pouze kontakty v tomto zařízení – nikam se nic nenahrává, vaše kontakty zůstávají beze změny.</string>
+    <string name="settings_special_dates_type_birthday">Narozeniny</string>
+    <string name="settings_special_dates_type_anniversary">Výročí</string>
+    <string name="settings_special_dates_type_custom">Ostatní data</string>
+    <string name="settings_special_dates_template">Formát názvu</string>
+    <string name="settings_special_dates_template_hint">Pro kontakt použijte {name} a pro rok {year} (rok narození nebo rok zahájení výročí; pokud není znám, údaj se skryje).</string>
+    <string name="settings_special_dates_show_year">Zobrazit rok</string>
+    <string name="settings_special_dates_show_year_hint">Uvést {year} v názvu, je-li znám</string>
+    <string name="settings_special_dates_sync_now">Synchronizovat nyní</string>
+    <string name="settings_special_dates_never_synced">Zatím nesynchronizováno</string>
+    <string name="settings_special_dates_last_synced">Naposledy synchronizováno %1$s</string>
+    <string name="settings_special_dates_calendar_hint">Barvu a viditelnost jednotlivých kalendářů nastavte v nastavení kalendářů.</string>
+    <string name="settings_calendar_reminders_managed_hint">Nastavte v části Speciální data kontaktu</string>
+    <string name="settings_special_dates_paused_title">Pozastaveno</string>
+    <string name="settings_special_dates_paused_hint">Calendula už nemá přístup k vašim kontaktům, tudíž zůstávají bez aktualizace.</string>
+    <string name="settings_special_dates_grant">Udělit přístup</string>
+    <string name="settings_special_dates_disable_title">Vypnout data kontaktů?</string>
+    <string name="settings_special_dates_disable_type_message">Tímto se odstraní kalendář „%1$s“ a jeho události. Veškeré připomínky a poznámky, které jste do nich přidali, budou ztraceny.</string>
+    <string name="settings_special_dates_disable_confirm">Vypnout</string>
+    <string name="dialog_save">Uložit</string>
+    <string name="settings_section_about">O aplikaci</string>
+    <string name="settings_license">Licence</string>
+    <string name="settings_license_value">MIT</string>
+    <string name="settings_about_author">od Jean-Luca Makioly</string>
+    <string name="settings_about_source">Zdroj</string>
+    <string name="settings_licences">Licence open source</string>
+    <string name="settings_licences_subtitle">Projekty, na kterých je Calendula postavena</string>
+    <string name="settings_about_privacy">Zásady ochrany osobních údajů</string>
+    <string name="settings_about_support">Podpořte vývoj</string>
+    <string name="settings_about_version">Verze %1$s</string>
+    <string name="settings_about_logo_desc">Ikona aplikace</string>
+    <string name="settings_report_problem">Nahlásit problém</string>
+    <string name="settings_report_problem_hint">Odeslat hlášení o pádu nebo otevřít systém pro sledování chyb</string>
+    <string name="licences_title">Licence open source</string>
+    <string name="licences_intro">Calendula zahrnuje níže uvedené projekty. Klepnutím na libovolnou položku zobrazíte jeho zdrojový kód.</string>
+    <string name="licences_footer">Každý projekt je zde zahrnut v nezměněné podobě a pod uvedenou licencí.</string>
+    <string name="calendars_title">Kalendáře</string>
+    <string name="calendars_local_header">Vaše kalendáře</string>
+    <string name="calendars_local_empty">Zatím nejsou k dispozici žádné místní kalendáře. Vytvořte si kalendář, chcete-li události ukládat pouze do tohoto zařízení.</string>
+    <string name="calendars_add">Přidat kalendář</string>
+    <string name="calendars_visibility_hint">Vypnutím kalendáře jej na tomto zařízení skryjete – jeho události zmizí z aplikace a přestanou se zobrazovat připomínky. Jde o stejný přepínač, jaký používají i ostatní aplikace kalendáře, takže se kalendář skryje i v nich. Nic se nemaže, další zařízení to neovlivní a kalendář můžete kdykoli znovu zapnout.</string>
+    <string name="calendars_visibility_a11y">Zobrazit „%1$s“</string>
+    <string name="calendars_visibility_notice_title">Některé kalendáře jsou vypnuté</string>
+    <string name="calendars_visibility_notice_message">Calendula zobrazuje kalendáře, které jsou pro toto zařízení zapnuté; některé z vašich kalendářů jsou však vypnuté. Chcete-li zobrazit jejich události, zapněte je v nabídce Nastavení → Kalendáře.</string>
+    <string name="calendar_picker_missing_title">Chybí vám kalendář?</string>
+    <string name="calendar_picker_missing_summary">Může být vypnutý, nastavený na režim „pouze pro čtení“ nebo naplněný daty z vašich kontaktů – své kalendáře spravujte zde.</string>
+    <string name="calendars_state_read_only">Pouze pro čtení</string>
+    <string name="calendars_state_not_synced">Není synchronizováno s tímto zařízením</string>
+    <string name="calendars_state_managed">Vyplněno z vašich kontaktů</string>
+    <string name="calendars_managed_delete_locked">Tento kalendář se plní z vašich kontaktů, takže jej aplikace Calendula při příští synchronizaci znovu vytvoří. Chcete-li jej odstranit, vypněte možnost speciálních dat v nabídce Nastavení → Speciální data.</string>
+    <string name="calendars_synced_header">Synchronizované kalendáře</string>
+    <string name="calendars_synced_hint">Tyto kontakty pocházejí z účtů ve vašem zařízení. Vytvářejte je a upravujte v příslušné aplikaci.</string>
+    <string name="calendars_manage_in_app">Spravovat v aplikaci</string>
+    <string name="calendars_account_from_source">%1$s (%2$s)</string>
+    <string name="calendars_account_menu_a11y">Více možností pro %1$s</string>
+    <string name="calendars_enable_all">Povolit vše</string>
+    <string name="calendars_disable_all">Zakázat vše</string>
+    <string name="calendars_add_account">Přidat účet</string>
+    <string name="calendars_new_title">Nový kalendář</string>
+    <string name="calendars_edit_title">Upravit kalendář</string>
+    <string name="calendars_name_label">Jméno</string>
+    <string name="calendars_color_label">Barva</string>
+    <string name="calendars_description_hint">Přidat popis</string>
+    <string name="calendars_delete_confirm_title">Vymazat kalendář?</string>
+    <string name="calendars_delete_confirm_message">„%1$s“ a všechny jeho události budou z tohoto zařízení trvale odstraněny.</string>
+    <string name="calendars_write_error">Změnu se nepodařilo uložit.</string>
+    <string name="calendars_backup_header">Záloha</string>
+    <string name="calendars_backup_hint">Místní kalendáře nejsou nikde synchronizovány, proto je pro uchování kopie exportujte do souboru ve formátu .ics.</string>
+    <string name="calendars_backup_action">Exportovat jako soubor .ics</string>
+    <string name="calendars_export_title">Exportovat kalendáře</string>
+    <string name="calendars_export_hint">Vyberte, které kalendáře chcete zahrnout do souboru .ics.</string>
+    <string name="calendars_export_action">Exportovat</string>
+    <string name="calendars_restore_header">Obnovit</string>
+    <string name="calendars_restore_action">Obnovit ze souboru .ics</string>
+    <string name="calendars_restore_hint">Importuovat události ze zálohy nebo z jiné aplikace kalendáře.</string>
+    <string name="calendars_auto_backup">Automatické zálohování</string>
+    <string name="calendars_auto_backup_hint">Pravidelně exportujte své místní kalendáře do složky jako soubor .ics.</string>
+    <string name="calendars_auto_backup_folder">Složka pro zálohování</string>
+    <string name="calendars_auto_backup_folder_unset">Klepnutím vyberte složku</string>
+    <string name="calendars_auto_backup_interval">Interval</string>
+    <string name="calendars_auto_backup_every">Každý %1$s</string>
+    <string name="calendars_auto_backup_interval_min">Minimálně 30 minut.</string>
+    <string name="calendars_auto_backup_status_never">Zatím není nastaveno žádné automatické zálohování</string>
+    <string name="calendars_auto_backup_status_ok">Poslední záloha: %1$s</string>
+    <string name="calendars_auto_backup_status_failed">Poslední zálohování selhalo: %1$s</string>
+    <string name="backup_channel_name">Záloha</string>
+    <string name="backup_channel_description">Upozorní, pokud automatické zálohování opakovaně selže.</string>
+    <string name="backup_failed_title">Automatické zálohování selhalo</string>
+    <string name="backup_failed_text">Calendula nemohla zapsat záložní soubor. Zkontrolujte složku pro zálohování v nastavení.</string>
+    <string name="calendars_backup_failed">Zálohu se nepodařilo exportovat.</string>
+    <plurals name="calendars_backup_done">
+        <item quantity="one">%d událost exportována.</item>
+        <item quantity="few">%d události exportovány.</item>
+        <item quantity="many">%d událostí exportováno.</item>
+        <item quantity="other">%d událostí exportováno.</item>
+    </plurals>
+    <string name="import_title">Importovat události</string>
+    <string name="import_target_header">Přidat do kalendáře</string>
+    <string name="import_empty">V souboru nenalezeny žádné události.</string>
+    <string name="import_failed">Tento soubor se nepodařilo přečíst.</string>
+    <string name="import_no_calendar">Neexistuje žádný kalendář s právem zápisu, do kterého by bylo možné importovat. Nejprve vytvořte místní kalendář.</string>
+    <string name="import_done_title">Import dokončen</string>
+    <string name="import_done_dedup_note">Události, které již byly v kalendáři, byly přeskočeny.</string>
+    <string name="import_done_added_label">Přidáno</string>
+    <string name="import_done_skipped_label">Duplicity</string>
+    <string name="import_done_failed_label">Nepřidáno</string>
+    <string name="import_done_failed_note">Některé události se nepodařilo přidat, a proto byly vynechány.</string>
+    <string name="import_done_stopped_title">Import byl zastaven</string>
+    <string name="import_close">Zavřít</string>
+    <string name="import_warning_recurrence">Některé změněné výskyty opakujících se událostí byly přeskočeny.</string>
+    <string name="import_warning_no_start">Událost bez času zahájení byla přeskočena.</string>
+    <string name="import_warning_attendees">Seznamy hostů nebyly importovány.</string>
+    <string name="import_warning_timezone">Neznámé časové pásmo se přepnulo na časové pásmo vašeho zařízení.</string>
+    <string name="import_warning_tasks">Úkoly v tomto souboru byly přidány jako události.</string>
+    <string name="import_warning_recurrence_repaired">Chybné pravidlo pro opakování bylo opraveno.</string>
+    <string name="import_button">Importovat</string>
+    <plurals name="import_title_count">
+        <item quantity="one">Importována %d událost</item>
+        <item quantity="few">Importovány %d události</item>
+        <item quantity="many">Importováno %d událostí</item>
+        <item quantity="other">Importováno %d událostí</item>
+    </plurals>
+    <plurals name="import_event_count">
+        <item quantity="one">V tomto souboru je %d událost.</item>
+        <item quantity="few">V tomto souboru jsou %d události.</item>
+        <item quantity="many">V tomto souboru je %d událostí.</item>
+        <item quantity="other">V tomto souboru je %d událostí.</item>
+    </plurals>
+    <plurals name="import_action">
+        <item quantity="one">Importovat %d událost</item>
+        <item quantity="few">Importovat %d události</item>
+        <item quantity="many">Importovat %d událostí</item>
+        <item quantity="other">Importovat %d událostí</item>
+    </plurals>
+    <plurals name="import_done_stopped">
+        <item quantity="one">Kalendář přestal v průběhu procesu zpracovávat události. %d událost ze souboru nebyla přidána.</item>
+        <item quantity="few">Kalendář přestal v průběhu procesu zpracovávat události. %d události ze souboru nebyly přidány.</item>
+        <item quantity="many">Kalendář přestal v průběhu procesu zpracovávat události. %d událostí ze souboru nebylo přidáno.</item>
+        <item quantity="other">Kalendář přestal v průběhu procesu zpracovávat události. %d událostí ze souboru nebylo přidáno.</item>
+    </plurals>
+    <plurals name="import_done_imported">
+        <item quantity="one">%d událost importována.</item>
+        <item quantity="few">%d události importovány.</item>
+        <item quantity="many">%d událostí importováno.</item>
+        <item quantity="other">%d událostí importováno.</item>
+    </plurals>
+    <plurals name="import_done_skipped">
+        <item quantity="one">Přeskočena %d událost, která již v tomto kalendáři existuje.</item>
+        <item quantity="few">Přeskočeny %d události, která již v tomto kalendáři existují.</item>
+        <item quantity="many">Přeskočeno %d událostí, která již v tomto kalendáři existují.</item>
+        <item quantity="other">Přeskočeno %d událostí, která již v tomto kalendáři existují.</item>
+    </plurals>
+    <plurals name="import_done_failed">
+        <item quantity="one">%d událost nebylo možné přidat.</item>
+        <item quantity="few">%d události nebylo možné přidat.</item>
+        <item quantity="many">%d událostí nebylo možné přidat.</item>
+        <item quantity="other">%d událostí nebylo možné přidat.</item>
+    </plurals>
+    <string name="shortcut_new_event_short">Nová událost</string>
+    <string name="shortcut_new_event_long">Vytvořit novou událost</string>
+    <string name="qs_tile_new_event_label">Nová událost</string>
+    <string name="settings_qs_tile">Přidat dlaždici rychlého nastavení</string>
+    <string name="settings_qs_tile_hint">Přidat dlaždici „Nová událost“ do panelu rychlého nastavení.</string>
+    <string name="crash_dialog_title">%1$s selhalo</string>
+    <string name="crash_dialog_message">%1$s se minule neočekávaně ukončilo. Můžete pomoci problém vyřešit odesláním tohoto hlášení. Hlášení zůstane ve vašem zařízení, dokud se jej nerozhodnete odeslat, a neobsahuje žádné osobní údaje ani obsah kalendáře – pouze níže uvedené technické detaily.</string>
+    <string name="crash_dialog_report">Odeslat hlášení o selhání</string>
+    <string name="crash_dialog_dismiss">Později</string>
+    <string name="crash_report_clip_label">Hlášení o selhání %1$s</string>
+    <string name="crash_report_copied">Hlášení bylo zkopírováno do schránky</string>
+    <string name="crash_report_open_failed">Nepodařilo se otevřít systém pro hlášení problémů. Zpráva je zkopírována ve vaší schránce.</string>
+    <string name="special_dates_calendar_birthday">Narozeniny</string>
+    <string name="special_dates_calendar_anniversary">Výročí</string>
+    <string name="special_dates_calendar_custom">Speciální data</string>
+    <string name="special_dates_default_title_birthday">Narozeniny má {name} ({year})</string>
+    <string name="special_dates_default_title_anniversary">Výročí má {name} ({year})</string>
+    <string name="special_dates_default_title_custom">{name}</string>
 </resources>

app/src/main/res/values-sk/strings.xml

@@ -263,4 +263,44 @@
     <string name="onboarding_done_button">Otvoriť môj kalendár</string>
     <string name="reminder_channel_name">Pripomienky udalostí</string>
     <string name="reminder_channel_description">Notifikácie v časoch pripomienok vašich udalostí</string>
+    <string name="agenda_today_action">Dnes</string>
+    <string name="agenda_header_today">Dnes</string>
+    <string name="search_back">Späť</string>
+    <string name="widget_new_event">Nová udalosť</string>
+    <string name="widget_prev_month">Predchádzajúci mesiac</string>
+    <string name="widget_next_month">Nasledujúci mesiac</string>
+    <string name="widget_today">Dnes</string>
+    <string name="filter_title">Kalendáre</string>
+    <string name="settings_title">Nastavenia</string>
+    <string name="settings_back">Späť</string>
+    <string name="back">Späť</string>
+    <string name="timeline_scale_custom">Vlastné</string>
+    <string name="agenda_range_day">Dnes</string>
+    <string name="state_failure_all_hidden">Všetky vaše kalendáre sú vypnuté.</string>
+    <string name="state_failure_all_hidden_action">Správa kalendárov</string>
+    <string name="field_copy_action">Kopírovať</string>
+    <string name="field_copied">Skopirovane do schránky</string>
+    <string name="field_copy_failed">Toto sa nepodarilo skopírovať</string>
+    <string name="event_detail_title">Názov</string>
+    <string name="reminder_after">%1$s po</string>
+    <string name="reminder_onboarding_title">Nikdy nezmeškajte udalosť</string>
+    <string name="reminder_onboarding_body">Samotný Android nezobrazuje pripomienky udalostí - to musí zabezpečiť aplikácia kalendáru. Nechajte túto prácu na Calendule.</string>
+    <string name="reminder_benefit_delivery_title">Pripomienky, doručené</string>
+    <string name="reminder_benefit_delivery_body">Pripomienky k vašim udalostiam vám prídu ako notifikácia, vždy a načas.</string>
+    <string name="reminder_benefit_duplicates_title">Používate ďalšiu aplikáciu s kalendárom?</string>
+    <string name="reminder_onboarding_skip_button">Neskôr</string>
+    <plurals name="search_delete_title">
+        <item quantity="one">Odstrániť %d udalosť?</item>
+        <item quantity="few">Odstrániť %d udalosti?</item>
+        <item quantity="many">Odstrániť %d udalostí?</item>
+        <item quantity="other">Odstrániť %d udalostí?</item>
+    </plurals>
+    <plurals name="search_delete_done">
+        <item quantity="one">%d udalosť odstránená</item>
+        <item quantity="few">%d udalosti odstránené</item>
+        <item quantity="many">%d odstránených udalostí</item>
+        <item quantity="other">%d odstránených udalostí</item>
+    </plurals>
+    <string name="agenda_range_this_week">Tento týždeň</string>
+    <string name="agenda_range_custom">Vlastné…</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -16,6 +16,7 @@
     <string name="state_failure_no_calendars_action">Open system calendar settings</string>
     <string name="state_failure_all_hidden">All your calendars are switched off.</string>
     <string name="state_failure_all_hidden_action">Manage calendars</string>
+    <string name="state_failure_no_import_target">None of your calendars can take new events. They are read-only, managed by another app, or not synced to this device.</string>
     <string name="state_failure_provider">Could not read the calendar.</string>
 
     <!-- Long-press a field to copy it (#195) -->
@@ -679,6 +680,7 @@
     <string name="calendars_restore_header">Restore</string>
     <string name="calendars_restore_action">Restore from .ics file</string>
     <string name="calendars_restore_hint">Import events from a backup or another calendar app.</string>
+    <string name="calendars_restore_unavailable">No calendar can take the imported events yet.</string>
     <string name="calendars_auto_backup">Automatic backup</string>
     <string name="calendars_auto_backup_hint">Periodically export your local calendars to a folder as an .ics file.</string>
     <string name="calendars_auto_backup_folder">Backup folder</string>

app/src/test/java/de/jeanlucmakiola/calendula/domain/ModelsTest.kt

@@ -36,12 +36,13 @@ class ModelsTest {
     }
 
     @Test
-    fun `FailureReason enum has all six variants`() {
+    fun `FailureReason enum has all seven variants`() {
         assertThat(FailureReason.values().toSet()).isEqualTo(
             setOf(
                 FailureReason.PermissionRevoked,
                 FailureReason.NoCalendarsConfigured,
                 FailureReason.AllCalendarsHidden,
+                FailureReason.NoImportTarget,
                 FailureReason.ProviderUnavailable,
                 FailureReason.EventNotFound,
                 FailureReason.Unknown,

app/src/test/java/de/jeanlucmakiola/calendula/domain/ics/IcsGoogleImportTest.kt

@@ -0,0 +1,116 @@
+package de.jeanlucmakiola.calendula.domain.ics
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.Availability
+import kotlinx.datetime.TimeZone
+import org.junit.jupiter.api.Test
+
+/**
+ * Reading a Google Calendar export (Codeberg #304), whose dialect the parser had
+ * never been held to: `VTIMEZONE` blocks with `X-LIC-LOCATION`, `TZID`-qualified
+ * `DTSTART`/`EXDATE`, folded `DESCRIPTION` and `ATTENDEE` lines, `RECURRENCE-ID`
+ * overrides written as separate `VEVENT`s, and `@google.com` UIDs.
+ *
+ * The fixture is a trimmed copy of what "Settings → Import & export → Export"
+ * produces, CRLF and all. Note that Google hands that export out as a **zip**
+ * containing one `.ics` per calendar — the file here is one member of it.
+ */
+class IcsGoogleImportTest {
+
+    private val parser = IcsParser(TimeZone.of("Europe/Berlin"))
+
+    private val result: IcsParseResult = parser.parse(
+        checkNotNull(
+            javaClass.classLoader?.getResourceAsStream("ics/google-calendar-export.ics"),
+        ).use { it.readBytes().toString(Charsets.UTF_8) },
+    )
+
+    private fun event(summary: String) = result.events.single { it.summary == summary }
+
+    @Test
+    fun `every master event imports and the VTIMEZONE block is not mistaken for one`() {
+        assertThat(result.events.map { it.summary })
+            .containsExactly("Team standup", "Day off", "Christmas break")
+    }
+
+    @Test
+    fun `X-WR-CALNAME names the calendar for all of them`() {
+        assertThat(result.events.map { it.calendarName }.distinct())
+            .containsExactly("jane@example.com")
+    }
+
+    @Test
+    fun `a TZID-qualified start resolves against the device tz database`() {
+        val standup = event("Team standup")
+        assertThat(standup.isAllDay).isFalse()
+        assertThat(standup.zoneId).isEqualTo("Europe/Berlin")
+        // 10:00 CEST is 08:00 UTC.
+        assertThat(standup.start.toString()).isEqualTo("2026-09-15T08:00:00Z")
+        assertThat((standup.end - standup.start).inWholeMinutes).isEqualTo(90)
+    }
+
+    @Test
+    fun `the recurrence rule and its TZID-qualified EXDATE survive`() {
+        val standup = event("Team standup")
+        assertThat(standup.recurrenceRule).isEqualTo("FREQ=WEEKLY;BYDAY=TU")
+        assertThat(standup.exDates).containsExactly("20260929T080000Z")
+    }
+
+    @Test
+    fun `the moved occurrence is skipped rather than imported as a duplicate`() {
+        // Google writes a RECURRENCE-ID override as its own VEVENT carrying the
+        // master's UID. Importing it would put a second "standup" in the
+        // calendar; Calendula models no overrides, so it is reported instead.
+        assertThat(result.events.map { it.summary }).doesNotContain("Team standup (moved)")
+        assertThat(result.warnings).contains(IcsParseWarning.ModifiedOccurrenceSkipped)
+    }
+
+    @Test
+    fun `a folded DESCRIPTION is unfolded and unescaped`() {
+        assertThat(event("Team standup").description).isEqualTo(
+            "Weekly sync with the team.\nAgenda lives in the shared doc, see the link below.",
+        )
+    }
+
+    @Test
+    fun `an escaped comma in LOCATION comes back as a comma`() {
+        assertThat(event("Team standup").location).isEqualTo("Meeting room 2, 3rd floor")
+    }
+
+    @Test
+    fun `attendees are reported rather than silently dropped`() {
+        assertThat(result.warnings).contains(IcsParseWarning.AttendeesIgnored)
+    }
+
+    @Test
+    fun `a timed VALARM becomes its lead time in minutes`() {
+        assertThat(event("Team standup").semanticReminderMinutes()).containsExactly(30)
+    }
+
+    @Test
+    fun `an all-day event keeps the single day the file gives it`() {
+        val dayOff = event("Day off")
+        assertThat(dayOff.isAllDay).isTrue()
+        assertThat((dayOff.end - dayOff.start).inWholeDays).isEqualTo(1)
+        assertThat(dayOff.availability).isEqualTo(Availability.Free)
+    }
+
+    @Test
+    fun `an all-day alarm comes back as whole days before`() {
+        // Google writes an all-day reminder as a whole-day offset from the
+        // event's UTC midnight; a day has to survive as a day.
+        assertThat(event("Day off").semanticReminderMinutes()).containsExactly(1440)
+    }
+
+    @Test
+    fun `a multi-day all-day event keeps its exclusive DTEND span`() {
+        val christmas = event("Christmas break")
+        assertThat(christmas.isAllDay).isTrue()
+        assertThat((christmas.end - christmas.start).inWholeDays).isEqualTo(3)
+    }
+
+    @Test
+    fun `no recurrence rule is repaired - Google writes them well-formed`() {
+        assertThat(result.warnings).doesNotContain(IcsParseWarning.RecurrenceRuleRepaired)
+    }
+}

app/src/test/java/de/jeanlucmakiola/calendula/ui/calendars/BackupUiStateTest.kt

@@ -0,0 +1,90 @@
+package de.jeanlucmakiola.calendula.ui.calendars
+
+import com.google.common.truth.Truth.assertThat
+import de.jeanlucmakiola.calendula.domain.CalendarSource
+import de.jeanlucmakiola.calendula.domain.FailureReason
+import org.junit.jupiter.api.Test
+
+/** What the Backup & restore screen offers for a given calendar list (#304). */
+class BackupUiStateTest {
+
+    private fun cal(
+        id: Long,
+        local: Boolean = false,
+        writable: Boolean = true,
+        visible: Boolean = true,
+        managed: Boolean = false,
+        syncs: Boolean = true,
+    ) = CalendarSource(
+        id = id,
+        displayName = "Calendar $id",
+        accountName = "acc@example.com",
+        accountType = if (local) "LOCAL" else "com.google",
+        color = 0,
+        isVisibleInSystem = visible,
+        canModifyContents = writable,
+        isLocal = local,
+        isManaged = managed,
+        syncsEvents = syncs,
+    )
+
+    private fun failure(state: BackupUiState) = (state as BackupUiState.Failure).reason
+
+    private fun ready(state: BackupUiState) = state as BackupUiState.Ready
+
+    @Test
+    fun `no calendars at all reports the empty device`() {
+        assertThat(failure(backupUiState(emptyList())))
+            .isEqualTo(FailureReason.NoCalendarsConfigured)
+    }
+
+    @Test
+    fun `a synced writable calendar can receive a restore`() {
+        val state = ready(backupUiState(listOf(cal(1L))))
+        assertThat(state.canImport).isTrue()
+        assertThat(state.exportable).isEmpty()
+    }
+
+    @Test
+    fun `the reported case - only a calendar that cannot take events`() {
+        // #304: a Google account with calendar sync switched off leaves nothing
+        // exportable and nothing importable, which used to render a blank screen.
+        assertThat(failure(backupUiState(listOf(cal(1L, syncs = false)))))
+            .isEqualTo(FailureReason.NoImportTarget)
+    }
+
+    @Test
+    fun `a read-only subscription is no import target either`() {
+        assertThat(failure(backupUiState(listOf(cal(1L, writable = false)))))
+            .isEqualTo(FailureReason.NoImportTarget)
+    }
+
+    @Test
+    fun `everything switched off is reported as hidden, not as a missing target`() {
+        // The remedy differs: a visibility switch fixes this one.
+        assertThat(failure(backupUiState(listOf(cal(1L, visible = false)))))
+            .isEqualTo(FailureReason.AllCalendarsHidden)
+    }
+
+    @Test
+    fun `a hidden local calendar still exports`() {
+        // Export reads the provider directly, so system visibility is irrelevant
+        // to it — calling this a failure would hide a working action.
+        val state = ready(backupUiState(listOf(cal(1L, local = true, visible = false))))
+        assertThat(state.exportable).hasSize(1)
+        assertThat(state.canImport).isFalse()
+    }
+
+    @Test
+    fun `a managed special-dates mirror is neither exportable nor a target`() {
+        assertThat(failure(backupUiState(listOf(cal(1L, local = true, managed = true)))))
+            .isEqualTo(FailureReason.NoImportTarget)
+    }
+
+    @Test
+    fun `a local calendar alongside a synced one offers both halves`() {
+        val state = ready(backupUiState(listOf(cal(1L, local = true), cal(2L))))
+        assertThat(state.exportable.map { it.id }).containsExactly(1L)
+        assertThat(state.canImport).isTrue()
+    }
+}

app/src/test/resources/ics/google-calendar-export.ics

@@ -0,0 +1,91 @@
+BEGIN:VCALENDAR
+PRODID:-//Google Inc//Google Calendar 70.9054//EN
+VERSION:2.0
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+X-WR-CALNAME:jane@example.com
+X-WR-TIMEZONE:Europe/Berlin
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+X-LIC-LOCATION:Europe/Berlin
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20260915T100000
+DTEND;TZID=Europe/Berlin:20260915T113000
+RRULE:FREQ=WEEKLY;BYDAY=TU
+EXDATE;TZID=Europe/Berlin:20260929T100000
+DTSTAMP:20260912T183000Z
+UID:0abcdef1234567890abcdef12345@google.com
+CREATED:20260901T120000Z
+DESCRIPTION:Weekly sync with the team.\nAgenda lives in the shared doc\, see
+  the link below.
+LAST-MODIFIED:20260902T081500Z
+LOCATION:Meeting room 2\, 3rd floor
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Team standup
+TRANSP:OPAQUE
+ORGANIZER;CN=Jane Doe:mailto:jane@example.com
+ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;CN=John:m
+ ailto:john@example.com
+BEGIN:VALARM
+ACTION:DISPLAY
+DESCRIPTION:This is an event reminder
+TRIGGER:-PT30M
+END:VALARM
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20260929T140000
+DTEND;TZID=Europe/Berlin:20260929T153000
+DTSTAMP:20260912T183000Z
+UID:0abcdef1234567890abcdef12345@google.com
+RECURRENCE-ID;TZID=Europe/Berlin:20260929T100000
+CREATED:20260901T120000Z
+LAST-MODIFIED:20260910T091500Z
+SEQUENCE:1
+STATUS:CONFIRMED
+SUMMARY:Team standup (moved)
+TRANSP:OPAQUE
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20261024
+DTEND;VALUE=DATE:20261025
+DTSTAMP:20260912T183000Z
+UID:1bcdef01234567890abcdef23456@google.com
+CREATED:20260820T101500Z
+LAST-MODIFIED:20260820T101500Z
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Day off
+TRANSP:TRANSPARENT
+BEGIN:VALARM
+ACTION:DISPLAY
+DESCRIPTION:This is an event reminder
+TRIGGER:-P1D
+END:VALARM
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20261224
+DTEND;VALUE=DATE:20261227
+DTSTAMP:20260912T183000Z
+UID:2cdef012345678901abcdef34567@google.com
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Christmas break
+TRANSP:TRANSPARENT
+END:VEVENT
+END:VCALENDAR

docs/PRIVACY.md

@@ -1,7 +1,7 @@
 ---
 title: Privacy Policy — Calendula
 description: What Calendula does with your data. It collects nothing, sends nothing, and has no internet permission at all.
-updated: 2026-07-28
+updated: 2026-09-15
 ---
 
 <!--
@@ -33,7 +33,7 @@ Calendula collects nothing, sends nothing, and has no user accounts. It has **no
 IT-Dienstleister | Jean-Luc Makiola  
 Mahlerstraße 10  
 14772 Brandenburg an der Havel  
-Email: [business@jeanlucmakiola.de](mailto:business@jeanlucmakiola.de)
+Email: [support@jeanlucmakiola.de](mailto:support@jeanlucmakiola.de)
 
 ## 2. No data collection
 

fastlane/metadata/android/en-US/changelogs/22004.txt

@@ -0,0 +1,3 @@
+Fixed
+• The app no longer reopens the event you last came in on. Opening an event from a reminder or a widget made it return to that event on every later launch, or show an error screen once the event was gone.
+• "Today" works in the Agenda again. It now scrolls the list back to today, and stays offered while you are scrolled away from it.

fdroid-metadata/de.jeanlucmakiola.calendula.yml

@@ -4,7 +4,7 @@ Name: Calendula
 Summary: A modern Material 3 Expressive calendar for Android.
 
 Categories:
-  - Time
+  - Calendar & Agenda
 
 SourceCode: https://codeberg.org/jlmakiola/calendula
 IssueTracker: https://codeberg.org/jlmakiola/calendula/issues