Refactoring

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -188,8 +188,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         private Group grpAttachments;
         private Group grpExpanded;
 
-        private ItemDetailsMessage itemDetails = null;
-
         ViewHolder(View itemView) {
             super(itemView);
 
@@ -542,7 +540,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                         });
             }
 
-            itemDetails = new ItemDetailsMessage(position, message.id);
             itemView.setActivated(selectionTracker != null && selectionTracker.isSelected(message.id));
         }
 
@@ -1530,7 +1527,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         }
 
         ItemDetailsLookup.ItemDetails<Long> getItemDetails(@NonNull MotionEvent motionEvent) {
-            return itemDetails;
+            return new ItemDetailsMessage(this);
+        }
+
+        Long getKey() {
+            return getKeyAtPosition(getAdapterPosition());
         }
     }
 
@@ -1575,6 +1576,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         return differ.getItemCount();
     }
 
+    @Override
+    public long getItemId(int position) {
+        return super.getItemId(position);
+    }
+
     private static final DiffUtil.ItemCallback<TupleMessageEx> DIFF_CALLBACK =
             new DiffUtil.ItemCallback<TupleMessageEx>() {
                 @Override
@@ -1616,6 +1622,54 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         this.selectionTracker = selectionTracker;
     }
 
+    int getPositionForKey(long key) {
+        PagedList<TupleMessageEx> messages = getCurrentList();
+        if (messages != null)
+            for (int i = 0; i < messages.size(); i++) {
+                TupleMessageEx message = messages.get(i);
+                if (message != null && message.id.equals(key)) {
+                    Log.i(Helper.TAG, "Position=" + i + " @Key=" + key);
+                    return i;
+                }
+            }
+        Log.i(Helper.TAG, "Position=" + RecyclerView.NO_POSITION + " @Key=" + key);
+        return RecyclerView.NO_POSITION;
+    }
+
+    TupleMessageEx getItemAtPosition(int pos) {
+        PagedList<TupleMessageEx> list = getCurrentList();
+        if (list != null && pos < list.size()) {
+            TupleMessageEx message = list.get(pos);
+            Long key = (message == null ? null : message.id);
+            Log.i(Helper.TAG, "Item=" + key + " @Position=" + pos);
+            return message;
+        } else {
+            Log.i(Helper.TAG, "Item=" + null + " @Position=" + pos);
+            return null;
+        }
+    }
+
+    TupleMessageEx getItemForKey(long key) {
+        PagedList<TupleMessageEx> messages = getCurrentList();
+        if (messages != null)
+            for (int i = 0; i < messages.size(); i++) {
+                TupleMessageEx message = messages.get(i);
+                if (message != null && message.id.equals(key)) {
+                    Log.i(Helper.TAG, "Item=" + message.id + " @Key=" + key);
+                    return message;
+                }
+            }
+        Log.i(Helper.TAG, "Item=" + null + " @Key" + key);
+        return null;
+    }
+
+    Long getKeyAtPosition(int pos) {
+        TupleMessageEx message = getItemAtPosition(pos);
+        Long key = (message == null ? null : message.id);
+        Log.i(Helper.TAG, "Key=" + key + " @Position=" + pos);
+        return key;
+    }
+
     interface IProperties {
         void setExpanded(long id, boolean expand);
 

app/src/main/java/eu/faircode/email/ItemDetailsMessage.java

@@ -19,26 +19,31 @@ package eu.faircode.email;
     Copyright 2018 by Marcel Bokhorst (M66B)
 */
 
+import android.util.Log;
+
 import androidx.annotation.Nullable;
 import androidx.recyclerview.selection.ItemDetailsLookup;
 
 public class ItemDetailsMessage extends ItemDetailsLookup.ItemDetails<Long> {
-    private int pos;
-    private Long key;
+    private AdapterMessage.ViewHolder viewHolder;
 
-    ItemDetailsMessage(int pos, Long id) {
-        this.pos = pos;
-        this.key = id;
+    ItemDetailsMessage(AdapterMessage.ViewHolder viewHolder) {
+        this.viewHolder = viewHolder;
     }
 
     @Override
     public int getPosition() {
+        int pos = viewHolder.getAdapterPosition();
+        Log.i(Helper.TAG, "ItemDetails pos=" + pos);
         return pos;
     }
 
     @Nullable
     @Override
     public Long getSelectionKey() {
+        int pos = viewHolder.getAdapterPosition();
+        Long key = viewHolder.getKey();
+        Log.i(Helper.TAG, "ItemDetails pos=" + pos + " key=" + key);
         return key;
     }
 }

app/src/main/java/eu/faircode/email/ItemKeyProviderMessage.java

@@ -21,7 +21,6 @@ package eu.faircode.email;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.paging.PagedList;
 import androidx.recyclerview.selection.ItemKeyProvider;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -37,23 +36,12 @@ public class ItemKeyProviderMessage extends ItemKeyProvider<Long> {
     @Override
     public Long getKey(int pos) {
         AdapterMessage adapter = (AdapterMessage) recyclerView.getAdapter();
-        PagedList<TupleMessageEx> list = adapter.getCurrentList();
-        if (list != null && pos < list.size())
-            return list.get(pos).id;
-        else
-            return null;
+        return adapter.getKeyAtPosition(pos);
     }
 
     @Override
     public int getPosition(@NonNull Long key) {
         AdapterMessage adapter = (AdapterMessage) recyclerView.getAdapter();
-        PagedList<TupleMessageEx> messages = adapter.getCurrentList();
-        if (messages != null)
-            for (int i = 0; i < messages.size(); i++) {
-                TupleMessageEx message = messages.get(i);
-                if (message != null && message.id.equals(key))
-                    return i;
-            }
-        return RecyclerView.NO_POSITION;
+        return adapter.getPositionForKey(key);
     }
 }

app/src/main/java/eu/faircode/email/SelectionPredicateMessage.java

@@ -20,7 +20,6 @@ package eu.faircode.email;
 */
 
 import androidx.annotation.NonNull;
-import androidx.paging.PagedList;
 import androidx.recyclerview.selection.SelectionTracker;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -39,34 +38,26 @@ public class SelectionPredicateMessage extends SelectionTracker.SelectionPredica
     @Override
     public boolean canSetStateForKey(@NonNull Long key, boolean nextState) {
         AdapterMessage adapter = (AdapterMessage) recyclerView.getAdapter();
-        PagedList<TupleMessageEx> messages = adapter.getCurrentList();
-        if (messages != null)
-            for (int i = 0; i < messages.size(); i++) {
-                TupleMessageEx message = messages.get(i);
-                if (message != null && message.id.equals(key)) {
-                    if (message.uid != null && (account < 0 || account == message.account)) {
-                        account = message.account;
-                        return true;
-                    } else
-                        return false;
-                }
-            }
+        TupleMessageEx message = adapter.getItemForKey(key);
+
+        if (message != null && message.uid != null && (account < 0 || account == message.account)) {
+            account = message.account;
+            return true;
+        }
+
         return false;
     }
 
     @Override
     public boolean canSetStateAtPosition(int position, boolean nextState) {
         AdapterMessage adapter = (AdapterMessage) recyclerView.getAdapter();
-        PagedList<TupleMessageEx> messages = adapter.getCurrentList();
-        if (messages != null) {
-            TupleMessageEx message = messages.get(position);
-            if (message != null) {
-                if (message.uid != null && (account < 0 || account == message.account)) {
-                    account = message.account;
-                    return true;
-                }
-            }
+        TupleMessageEx message = adapter.getItemAtPosition(position);
+
+        if (message != null && message.uid != null && (account < 0 || account == message.account)) {
+            account = message.account;
+            return true;
         }
+
         return false;
     }