From 7c4e6a11e17a1157ec1045930f08dd78d65619f5 Mon Sep 17 00:00:00 2001
From: Tom Hacohen <tom@stosb.com>
Date: Wed, 15 Feb 2017 17:30:47 +0000
Subject: [PATCH] Disallow deleting the last collection.

---
 .../java/at/bitfire/davdroid/ui/AccountActivity.java  | 11 ++++++++++-
 app/src/main/res/values/strings.xml                   |  2 ++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java b/app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java
index 94beb50b..c04750f7 100644
--- a/app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java
+++ b/app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java
@@ -236,7 +236,16 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
                 public boolean onMenuItemClick(MenuItem item) {
                     switch (item.getItemId()) {
                         case R.id.delete_collection:
-                            DeleteCollectionFragment.ConfirmDeleteCollectionFragment.newInstance(account, info).show(getSupportFragmentManager(), null);
+                            if (adapter.getCount() == 1) {
+                                new AlertDialog.Builder(AccountActivity.this)
+                                        .setIcon(R.drawable.ic_error_dark)
+                                        .setTitle(R.string.account_delete_collection_last_title)
+                                        .setMessage(R.string.account_delete_collection_last_text)
+                                        .setPositiveButton(android.R.string.ok, null)
+                                        .show();
+                            } else {
+                                DeleteCollectionFragment.ConfirmDeleteCollectionFragment.newInstance(account, info).show(getSupportFragmentManager(), null);
+                            }
                             break;
                     }
                     return true;
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 96d5eb31..cdf394db 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -108,6 +108,8 @@
     <string name="account_create_new_address_book">Create new address book</string>
     <string name="account_refresh_calendar_list">Refresh calendar list</string>
     <string name="account_create_new_calendar">Create new calendar</string>
+    <string name="account_delete_collection_last_title">Can\'t delete last collection</string>
+    <string name="account_delete_collection_last_text">Deleting the last collection is not allowed, please create a new one if you\'d like to delete this one.</string>
 
     <!-- PermissionsActivity -->
     <string name="permissions_title">EteSync permissions</string>