回答編集履歴

追記

2021/05/26 16:16

投稿

hoshi-takanori

スコア7899

test CHANGED Viewed

@@ -133,3 +133,91 @@
 }
 ```
+最後まで行ったら最初に戻るようにするには、次のように変更すると良いでしょう。
+```diff
+ public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.CustomViewHolder> {
+     private RecyclerView recyclerView;
++    private LinearLayoutManager layoutManager;
+     private List<Item> items;
++    private int focusPosition = -1;
+-    public CustomAdapter(RecyclerView recyclerView, List<Item> items) {
++    public CustomAdapter(RecyclerView recyclerView, LinearLayoutManager layoutManager, List<Item> items) {
+         this.recyclerView = recyclerView;
++        this.layoutManager = layoutManager;
+         this.items = items;
++
++        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
++            @Override
++            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
++                if (newState == RecyclerView.SCROLL_STATE_IDLE && focusPosition >= 0) {
++                    setFocus(focusPosition);
++                    focusPosition = -1;
++                }
++            }
++        });
+     }
+     // 略
+         public void focusNext() {
+             int position = getAdapterPosition() + 1;
+-            if (position < items.size()) {
++            if (position == items.size()) {
++                position = 0;
++            }
++            if (position >= layoutManager.findFirstCompletelyVisibleItemPosition() &&
++                    position <= layoutManager.findLastCompletelyVisibleItemPosition()) {
+                 setFocus(position);
++            } else {
++                focusPosition = position;
++                recyclerView.smoothScrollToPosition(position);
+             }
+         }
+```