Warn when local folder is empty instead of silently ignoring (#6366)

2 files changed, 11 insertions, 7 deletions

diff --git a/core/src/main/java/de/danoeh/antennapod/core/feed/LocalFeedUpdater.java b/core/src/main/java/de/danoeh/antennapod/core/feed/LocalFeedUpdater.java
index 058602fdd..3db4bf2ab 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/feed/LocalFeedUpdater.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/feed/LocalFeedUpdater.java
@@ -77,7 +77,7 @@ public class LocalFeedUpdater {
 
     @VisibleForTesting
     static void tryUpdateFeed(Feed feed, Context context, Uri folderUri,
-                              UpdaterProgressListener updaterProgressListener) {
+                              UpdaterProgressListener updaterProgressListener) throws IOException {
         if (feed.getItems() == null) {
             feed.setItems(new ArrayList<>());
         }
@@ -128,11 +128,10 @@ public class LocalFeedUpdater {
         feed.setDescription(context.getString(R.string.local_feed_description));
         feed.setAuthor(context.getString(R.string.local_folder));
 
-        // update items, delete items without existing file;
-        // only delete items if the folder contains at least one element to avoid accidentally
-        // deleting played state or position in case the folder is temporarily unavailable.
-        boolean removeUnlistedItems = (newItems.size() >= 1);
-        DBTasks.updateFeed(context, feed, removeUnlistedItems);
+        if (newItems.isEmpty()) {
+            throw new IOException("Empty folder. Make sure that the folder is accessible and contains media files.");
+        }
+        DBTasks.updateFeed(context, feed, true);
     }
 
     /**
diff --git a/core/src/test/java/de/danoeh/antennapod/core/feed/LocalFeedUpdaterTest.java b/core/src/test/java/de/danoeh/antennapod/core/feed/LocalFeedUpdaterTest.java
index a04884cac..7c877103f 100644
--- a/core/src/test/java/de/danoeh/antennapod/core/feed/LocalFeedUpdaterTest.java
+++ b/core/src/test/java/de/danoeh/antennapod/core/feed/LocalFeedUpdaterTest.java
@@ -26,6 +26,7 @@ import org.robolectric.RobolectricTestRunner;
 import org.robolectric.shadows.ShadowMediaMetadataRetriever;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -262,7 +263,11 @@ public class LocalFeedUpdaterTest {
 
             // call method to test
             Feed feed = new Feed(FEED_URL, null);
-            LocalFeedUpdater.tryUpdateFeed(feed, context, null, null);
+            try {
+                LocalFeedUpdater.tryUpdateFeed(feed, context, null, null);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
         }
     }