Add FAB to cancel sync adapter syncs

app/src/main/kotlin/at/bitfire/davdroid/ui/AccountsModel.kt

@@ -5,6 +5,7 @@
 package at.bitfire.davdroid.ui
 
 import android.accounts.Account
+import android.accounts.AccountManager
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
@@ -13,6 +14,8 @@ import android.net.ConnectivityManager
 import android.net.Network
 import android.net.NetworkCapabilities
 import android.net.NetworkRequest
+import android.os.Build
+import android.os.Bundle
 import android.os.PowerManager
 import android.provider.CalendarContract
 import android.provider.ContactsContract
@@ -22,6 +25,7 @@ import androidx.lifecycle.ViewModel
 import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import androidx.work.WorkQuery
+import at.bitfire.davdroid.R
 import at.bitfire.davdroid.db.AppDatabase
 import at.bitfire.davdroid.repository.AccountRepository
 import at.bitfire.davdroid.servicedetection.RefreshCollectionsWorker
@@ -296,4 +300,30 @@ class AccountsModel @AssistedInject constructor(
             false
         }
 
+    fun cancelSyncAdapterSyncs() {
+        if (Build.VERSION.SDK_INT >= 34) {
+            val calendarAccountType = context.getString(R.string.account_type)
+            val addressBookAccountType = context.getString(R.string.account_type_address_book)
+
+            // Cancel any (after an update) possibly forever pending calendar (+tasks) account syncs
+            cancelSyncs(calendarAccountType, CalendarContract.AUTHORITY)
+
+            // Cancel any (after an update) possibly forever pending address book account syncs
+            cancelSyncs(addressBookAccountType, ContactsContract.AUTHORITY)
+        }
+    }
+
+    /**
+     * Cancels any (possibly forever pending) syncs for the accounts of given account type for all
+     * authorities.
+     */
+    private fun cancelSyncs(accountType: String, authority: String) {
+        val accountManager = AccountManager.get(context)
+        accountManager.getAccountsByType(accountType).forEach { account ->
+            val extras = Bundle()
+            logger.info("Android 14+: Canceling all (possibly forever pending) syncs for $account and $authority with $extras")
+            syncFrameWork.cancelSync(account, authority, extras)
+        }
+    }
+
 }

app/src/main/kotlin/at/bitfire/davdroid/ui/AccountsScreen.kt

@@ -23,6 +23,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.AccountCircle
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.BatterySaver
+import androidx.compose.material.icons.filled.CancelScheduleSend
 import androidx.compose.material.icons.filled.DataSaverOn
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.NotificationsOff
@@ -111,6 +112,7 @@ fun AccountsScreen(
     }
 
     AccountsScreen(
+        cancelSyncAdapterSyncs = { model.cancelSyncAdapterSyncs() },
         accountsDrawerHandler = accountsDrawerHandler,
         accounts = accounts,
         showSyncAll = showSyncAll,
@@ -131,6 +133,7 @@ fun AccountsScreen(
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalPermissionsApi::class)
 @Composable
 fun AccountsScreen(
+    cancelSyncAdapterSyncs: () -> Unit,
     accountsDrawerHandler: AccountsDrawerHandler,
     accounts: List<AccountsModel.AccountInfo>,
     showSyncAll: Boolean = true,
@@ -228,6 +231,17 @@ fun AccountsScreen(
                                     contentDescription = stringResource(R.string.accounts_sync_all)
                                 )
                             }
+                        FloatingActionButton(
+                            onClick = cancelSyncAdapterSyncs,
+                            containerColor = MaterialTheme.colorScheme.secondary,
+                            contentColor = MaterialTheme.colorScheme.onSecondary,
+                            modifier = Modifier.padding(top = 24.dp)
+                        ) {
+                            Icon(
+                                Icons.Default.CancelScheduleSend,
+                                contentDescription = stringResource(R.string.accounts_sync_all)
+                            )
+                        }
                     }
                 },
                 snackbarHost = { SnackbarHost(snackbarHostState) }
@@ -321,6 +335,7 @@ fun AccountsScreen(
 @Preview
 fun AccountsScreen_Preview_Empty() {
     AccountsScreen(
+        cancelSyncAdapterSyncs = {},
         accountsDrawerHandler = object: AccountsDrawerHandler() {
             @Composable
             override fun MenuEntries(snackbarHostState: SnackbarHostState) {
@@ -337,6 +352,7 @@ fun AccountsScreen_Preview_Empty() {
 @Preview
 fun AccountsScreen_Preview_OneAccount() {
     AccountsScreen(
+        cancelSyncAdapterSyncs = {},
         accountsDrawerHandler = object: AccountsDrawerHandler() {
             @Composable
             override fun MenuEntries(snackbarHostState: SnackbarHostState) {