Show a warning if calendar or contacts storage is deactivated or missing

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

@@ -8,11 +8,14 @@ import android.accounts.Account
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
+import android.content.pm.PackageManager.NameNotFoundException
 import android.net.ConnectivityManager
 import android.net.Network
 import android.net.NetworkCapabilities
 import android.net.NetworkRequest
 import android.os.PowerManager
+import android.provider.CalendarContract
+import android.provider.ContactsContract
 import androidx.core.content.getSystemService
 import androidx.core.content.pm.ShortcutManagerCompat
 import androidx.lifecycle.ViewModel
@@ -30,6 +33,7 @@ import at.bitfire.davdroid.ui.account.AccountProgress
 import at.bitfire.davdroid.ui.intro.IntroPage
 import at.bitfire.davdroid.ui.intro.IntroPageFactory
 import at.bitfire.davdroid.util.broadcastReceiverFlow
+import at.bitfire.davdroid.util.packageChangedFlow
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedFactory
 import dagger.assisted.AssistedInject
@@ -48,9 +52,9 @@ import java.util.logging.Logger
 
 @HiltViewModel(assistedFactory = AccountsModel.Factory::class)
 class AccountsModel @AssistedInject constructor(
-    @Assisted val syncAccountsOnInit: Boolean,
+    @Assisted private val syncAccountsOnInit: Boolean,
     private val accountRepository: AccountRepository,
-    @ApplicationContext val context: Context,
+    @ApplicationContext private val context: Context,
     private val db: AppDatabase,
     introPageFactory: IntroPageFactory,
     private val logger: Logger,
@@ -203,6 +207,16 @@ class AccountsModel @AssistedInject constructor(
             }
         }
 
+    /** whether the calendar storage is missing or disabled */
+    val calendarStorageDisabled = packageChangedFlow(context).map {
+        !contentProviderAvailable(CalendarContract.AUTHORITY)
+    }
+
+    /** whether the calendar storage is missing or disabled */
+    val contactsStorageDisabled = packageChangedFlow(context).map {
+        !contentProviderAvailable(ContactsContract.AUTHORITY)
+    }
+
 
     init {
         if (syncAccountsOnInit)
@@ -221,4 +235,17 @@ class AccountsModel @AssistedInject constructor(
             syncWorkerManager.enqueueOneTimeAllAuthorities(account, manual = true)
     }
 
+
+    // helpers
+
+    fun contentProviderAvailable(authority: String): Boolean =
+        try {
+            // resolveContentProvider returns null if the provider app is disabled or missing;
+            // so we can't distinguish between "disabled" and "not found"
+            context.packageManager.resolveContentProvider(authority, 0) != null
+        } catch (_: NameNotFoundException) {
+            logger.fine("$authority provider app not found")
+            false
+        }
+
 }

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

@@ -62,10 +62,12 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalInspectionMode
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
@@ -122,7 +124,9 @@ fun AccountsScreen(
         internetUnavailable = !model.networkAvailable.collectAsStateWithLifecycle(false).value,
         batterySaverActive = model.batterySaverActive.collectAsStateWithLifecycle(false).value,
         dataSaverActive = model.dataSaverEnabled.collectAsStateWithLifecycle(false).value,
-        storageLow = model.storageLow.collectAsStateWithLifecycle(false).value
+        storageLow = model.storageLow.collectAsStateWithLifecycle(false).value,
+        calendarStorageDisabled = model.calendarStorageDisabled.collectAsStateWithLifecycle(false).value,
+        contactsStorageDisabled = model.contactsStorageDisabled.collectAsStateWithLifecycle(false).value
     )
 }
 
@@ -140,7 +144,9 @@ fun AccountsScreen(
     internetUnavailable: Boolean = false,
     batterySaverActive: Boolean = false,
     dataSaverActive: Boolean = false,
-    storageLow: Boolean = false
+    storageLow: Boolean = false,
+    calendarStorageDisabled: Boolean = false,
+    contactsStorageDisabled: Boolean = false
 ) {
     val scope = rememberCoroutineScope()
 
@@ -293,7 +299,14 @@ fun AccountsScreen(
                                     val intent = Intent(Settings.ACTION_INTERNAL_STORAGE_SETTINGS)
                                     if (intent.resolveActivity(context.packageManager) != null)
                                         context.startActivity(intent)
-                                }
+                                },
+                                calendarStorageDisabled = calendarStorageDisabled,
+                                contactsStorageDisabled = contactsStorageDisabled,
+                                onManageApps = {
+                                    val intent = Intent(Settings.ACTION_APPLICATION_SETTINGS)
+                                    if (intent.resolveActivity(context.packageManager) != null)
+                                        context.startActivity(intent)
+                                },
                             )
 
                             // account list
@@ -435,36 +448,42 @@ fun AccountList(
 @Composable
 @Preview
 fun AccountList_Preview_Idle() {
-    AccountList(
-        listOf(
-            AccountsModel.AccountInfo(
-                Account("Account Name", "test"),
-                AccountProgress.Idle
+    AppTheme {
+        AccountList(
+            listOf(
+                AccountsModel.AccountInfo(
+                    Account("Account Name", "test"),
+                    AccountProgress.Idle
+                )
             )
         )
-    )
+    }
 }
 
 @Composable
 @Preview
 fun AccountList_Preview_SyncPending() {
-    AccountList(listOf(
-        AccountsModel.AccountInfo(
-            Account("Account Name", "test"),
-            AccountProgress.Pending
-        )
-    ))
+    AppTheme {
+        AccountList(listOf(
+            AccountsModel.AccountInfo(
+                Account("Account Name", "test"),
+                AccountProgress.Pending
+            )
+        ))
+    }
 }
 
 @Composable
 @Preview
 fun AccountList_Preview_Syncing() {
-    AccountList(listOf(
-        AccountsModel.AccountInfo(
-            Account("Account Name", "test"),
-            AccountProgress.Active
-        )
-    ))
+    AppTheme {
+        AccountList(listOf(
+            AccountsModel.AccountInfo(
+                Account("Account Name", "test"),
+                AccountProgress.Active
+            )
+        ))
+    }
 }
 
 
@@ -479,7 +498,10 @@ fun SyncWarnings(
     dataSaverActive: Boolean = true,
     onManageDataSaver: () -> Unit = {},
     lowStorageWarning: Boolean = true,
-    onManageStorage: () -> Unit = {}
+    onManageStorage: () -> Unit = {},
+    calendarStorageDisabled: Boolean = false,
+    contactsStorageDisabled: Boolean = false,
+    onManageApps: () -> Unit = {}
 ) {
     Column(Modifier.padding(horizontal = 8.dp)) {
         if (notificationsWarning)
@@ -531,17 +553,41 @@ fun SyncWarnings(
             ) {
                 Text(stringResource(R.string.account_list_low_storage))
             }
+
+        if (calendarStorageDisabled)
+            ActionCard(
+                icon = ImageVector.vectorResource(R.drawable.ic_database_off),
+                actionText = stringResource(R.string.account_list_manage_apps),
+                onAction = onManageApps,
+                modifier = Modifier.padding(vertical = 4.dp)
+            ) {
+                Text(stringResource(R.string.account_list_calendar_storage_disabled))
+            }
+
+        if (contactsStorageDisabled)
+            ActionCard(
+                icon = ImageVector.vectorResource(R.drawable.ic_database_off),
+                actionText = stringResource(R.string.account_list_manage_apps),
+                onAction = onManageApps,
+                modifier = Modifier.padding(vertical = 4.dp)
+            ) {
+                Text(stringResource(R.string.account_list_contacts_storage_disabled))
+            }
     }
 }
 
 @Composable
 @Preview
 fun SyncWarnings_Preview() {
-    SyncWarnings(
-        notificationsWarning = true,
-        internetWarning = true,
-        batterySaverActive = true,
-        dataSaverActive = true,
-        lowStorageWarning = true
-    )
+    AppTheme {
+        SyncWarnings(
+            notificationsWarning = true,
+            internetWarning = true,
+            batterySaverActive = true,
+            dataSaverActive = true,
+            lowStorageWarning = true,
+            calendarStorageDisabled = true,
+            contactsStorageDisabled = true
+        )
+    }
 }

app/src/main/res/drawable/ic_database_off.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M446,514ZM552,419ZM446,514ZM552,419ZM446,514ZM552,419ZM791,904 L56,169l56,-57 736,736 -57,56ZM480,840q-151,0 -255.5,-46.5T120,680v-400q0,-26 17.5,-49.5T187,187l252,252q-72,-3 -133,-18t-106,-40v120q51,29 123,44t157,15q20,0 39,-0.5t38,-2.5l70,70q-34,7 -71,10t-76,3q-85,0 -157,-15t-123,-44v99q9,29 97.5,54.5T480,760q64,0 128.5,-13T715,715l58,58q-49,31 -125.5,49T480,840ZM830,717 L760,647v-66q-11,6 -22,11t-23,10l-61,-61q30,-8 56.5,-17.5T760,501v-120q-41,23 -94,37t-116,19l-76,-76q44,0 92,-7t89.5,-18.5q41.5,-11.5 70,-26T760,281q-11,-29 -100.5,-55T480,200q-37,0 -75.5,5T331,218l-66,-66q45,-15 100,-23.5t115,-8.5q149,0 254.5,47T840,280v400q0,10 -2.5,19t-7.5,18Z"
+      android:fillColor="@android:color/black"/>
+</vector>

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

@@ -141,6 +141,9 @@
     <string name="account_list_manage_battery_saver">Manage battery saver</string>
     <string name="account_list_low_storage">Storage space low. Android will not sync local changes immediately, but during the next regular sync.</string>
     <string name="account_list_manage_storage">Manage storage</string>
+    <string name="account_list_calendar_storage_disabled">Calendar provider missing. Did you disable the \"Calendar storage\" system app?</string>
+    <string name="account_list_contacts_storage_disabled">Contacts provider missing. Did you disable the \"Contacts storage\" system app?</string>
+    <string name="account_list_manage_apps">Manage apps</string>
     <string name="account_list_welcome">Welcome to DAVx⁵!</string>
     <string name="account_list_empty">Connect to your server and keep your calendars and contacts synchronized.</string>
     <string name="accounts_sync_all">Sync all accounts</string>