Fixed item flickering while downloading

7 files changed, 24 insertions, 11 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/adapter/EpisodeItemListAdapter.java b/app/src/main/java/de/danoeh/antennapod/adapter/EpisodeItemListAdapter.java
index f8fd99867..2f39b599f 100644
--- a/app/src/main/java/de/danoeh/antennapod/adapter/EpisodeItemListAdapter.java
+++ b/app/src/main/java/de/danoeh/antennapod/adapter/EpisodeItemListAdapter.java
@@ -68,6 +68,19 @@ public class EpisodeItemListAdapter extends RecyclerView.Adapter<EpisodeItemView
         holder.hideSeparatorIfNecessary();
     }
 
+    /**
+     * {@link #notifyItemChanged(int)} is final, so we can not override.
+     * Calling {@link #notifyItemChanged(int)} may bind the item to a new ViewHolder and execute a transition.
+     * This causes flickering and breaks the download animation that stores the old progress in the View.
+     * Instead, we tell the adapter to use partial binding by calling {@link #notifyItemChanged(int, Object)}.
+     * We actually ignore the payload and always do a full bind but calling the partial bind method ensures
+     * that ViewHolders are always re-used.
+     * @param position Position of the item that has changed
+     */
+    public void notifyItemChangedCompat(int position) {
+        notifyItemChanged(position, "foo");
+    }
+
     @Nullable
     public FeedItem getSelectedItem() {
         return selectedItem;
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
index fbd6a6670..20999abe9 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
@@ -151,7 +151,7 @@ public class CompletedDownloadsFragment extends Fragment {
                 items.remove(pos);
                 if (item.getMedia().isDownloaded()) {
                     items.add(pos, item);
-                    adapter.notifyItemChanged(pos);
+                    adapter.notifyItemChangedCompat(pos);
                 } else {
                     adapter.notifyItemRemoved(pos);
                 }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
index cb72153c2..2a7c1f2b1 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
@@ -358,7 +358,7 @@ public abstract class EpisodesListFragment extends Fragment {
                 episodes.remove(pos);
                 if (shouldUpdatedItemRemainInList(item)) {
                     episodes.add(pos, item);
-                    listAdapter.notifyItemChanged(pos);
+                    listAdapter.notifyItemChangedCompat(pos);
                 } else {
                     listAdapter.notifyItemRemoved(pos);
                 }
@@ -394,7 +394,7 @@ public abstract class EpisodesListFragment extends Fragment {
             for (long mediaId : update.mediaIds) {
                 int pos = FeedItemUtil.indexOfItemWithMediaId(episodes, mediaId);
                 if (pos >= 0) {
-                    listAdapter.notifyItemChanged(pos);
+                    listAdapter.notifyItemChangedCompat(pos);
                 }
             }
         }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/FeedItemlistFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/FeedItemlistFragment.java
index bba17652a..b4e28567c 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/FeedItemlistFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/FeedItemlistFragment.java
@@ -354,7 +354,7 @@ public class FeedItemlistFragment extends Fragment implements AdapterView.OnItem
             if (pos >= 0) {
                 feed.getItems().remove(pos);
                 feed.getItems().add(pos, item);
-                adapter.notifyItemChanged(pos);
+                adapter.notifyItemChangedCompat(pos);
             }
         }
     }
@@ -370,7 +370,7 @@ public class FeedItemlistFragment extends Fragment implements AdapterView.OnItem
             for (long mediaId : update.mediaIds) {
                 int pos = FeedItemUtil.indexOfItemWithMediaId(feed.getItems(), mediaId);
                 if (pos >= 0) {
-                    adapter.notifyItemChanged(pos);
+                    adapter.notifyItemChangedCompat(pos);
                 }
             }
         }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/PlaybackHistoryFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/PlaybackHistoryFragment.java
index 36cda5c84..10a5a81d4 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/PlaybackHistoryFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/PlaybackHistoryFragment.java
@@ -115,7 +115,7 @@ public class PlaybackHistoryFragment extends Fragment {
             if (pos >= 0) {
                 playbackHistory.remove(pos);
                 playbackHistory.add(pos, item);
-                adapter.notifyItemChanged(pos);
+                adapter.notifyItemChangedCompat(pos);
             }
         }
     }
@@ -128,7 +128,7 @@ public class PlaybackHistoryFragment extends Fragment {
             for (long mediaId : update.mediaIds) {
                 int pos = FeedItemUtil.indexOfItemWithMediaId(playbackHistory, mediaId);
                 if (pos >= 0) {
-                    adapter.notifyItemChanged(pos);
+                    adapter.notifyItemChangedCompat(pos);
                 }
             }
         }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
index 404ea1d8d..0a752b855 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java
@@ -178,7 +178,7 @@ public class QueueFragment extends Fragment {
             if (pos >= 0) {
                 queue.remove(pos);
                 queue.add(pos, item);
-                recyclerAdapter.notifyItemChanged(pos);
+                recyclerAdapter.notifyItemChangedCompat(pos);
                 refreshInfoBar();
             }
         }
@@ -195,7 +195,7 @@ public class QueueFragment extends Fragment {
             for (long mediaId : update.mediaIds) {
                 int pos = FeedItemUtil.indexOfItemWithMediaId(queue, mediaId);
                 if (pos >= 0) {
-                    recyclerAdapter.notifyItemChanged(pos);
+                    recyclerAdapter.notifyItemChangedCompat(pos);
                 }
             }
         }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/SearchFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/SearchFragment.java
index 4bb7ec28a..389996b07 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/SearchFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/SearchFragment.java
@@ -215,7 +215,7 @@ public class SearchFragment extends Fragment {
             if (pos >= 0) {
                 results.remove(pos);
                 results.add(pos, item);
-                adapter.notifyItemChanged(pos);
+                adapter.notifyItemChangedCompat(pos);
             }
         }
     }
@@ -228,7 +228,7 @@ public class SearchFragment extends Fragment {
             for (long mediaId : update.mediaIds) {
                 int pos = FeedItemUtil.indexOfItemWithMediaId(results, mediaId);
                 if (pos >= 0) {
-                    adapter.notifyItemChanged(pos);
+                    adapter.notifyItemChangedCompat(pos);
                 }
             }
         }