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app/src/leanback/java/com/fongmi/android/tv/ui/adapter/ButtonsAdapter.java

@@ -18,9 +18,13 @@ import java.util.Map;
 public class ButtonsAdapter extends RecyclerView.Adapter<ButtonsAdapter.ViewHolder> {
 
     private List<Button> mItems;
+    private int upFocus;
+    private int downFocus;
 
     public ButtonsAdapter() {
         this.mItems = Button.sortedAll();
+        this.upFocus = -1;
+        this.downFocus = -1;
     }
 
     @Override
@@ -42,7 +46,10 @@ public class ButtonsAdapter extends RecyclerView.Adapter<ButtonsAdapter.ViewHold
         holder.binding.select.setOnLongClickListener(v -> onItemLongClick(item));
         holder.binding.select.setOnClickListener(v -> onItemClick(item, position));
         holder.binding.text.setGravity(Gravity.START);
+        holder.binding.down.setOnClickListener(v -> onDownClick(item, position));
         holder.binding.up.setOnClickListener(v -> onUpClick(item, position));
+        if (upFocus == position) holder.binding.up.requestFocus();
+        else if (downFocus == position) holder.binding.down.requestFocus();
     }
 
     private boolean getChecked(Button item) {
@@ -69,6 +76,21 @@ public class ButtonsAdapter extends RecyclerView.Adapter<ButtonsAdapter.ViewHold
         return true;
     }
 
+    private void onDownClick(Button item, int position) {
+        if (position == getItemCount() - 1) return;
+        List<Button> buttonList = Button.sortedAll();
+        Button button = buttonList.get(position);
+        buttonList.remove(position);
+        buttonList.add(position + 1, button);
+        Map<Integer, Button> map = Button.getMap(buttonList);
+        Button.saveSorted(map);
+        mItems = Button.sortedAll();
+        save(mItems, Button.getButtonsMap());
+        downFocus = position + 1;
+        upFocus = -1;
+        notifyItemRangeChanged(0, getItemCount());
+    }
+
     private void onUpClick(Button item, int position) {
         if (position == 0) return;
         List<Button> buttonList = Button.sortedAll();
@@ -79,6 +101,8 @@ public class ButtonsAdapter extends RecyclerView.Adapter<ButtonsAdapter.ViewHold
         Button.saveSorted(map);
         mItems = Button.sortedAll();
         save(mItems, Button.getButtonsMap());
+        upFocus = position - 1;
+        downFocus = -1;
         notifyItemRangeChanged(0, getItemCount());
     }
 

app/src/leanback/res/drawable/ic_action_down.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M20,12l-1.41,-1.41L13,16.17V4h-2v12.17l-5.58,-5.59L4,12l8,8 8,-8z"/>
+</vector>

app/src/leanback/res/layout/adapter_buttons.xml

@@ -39,6 +39,17 @@
             android:focusableInTouchMode="false" />
     </LinearLayout>
 
+    <ImageView
+        android:id="@+id/down"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:layout_marginLeft="10dp"
+        android:background="@drawable/selector_text"
+        android:focusable="true"
+        android:focusableInTouchMode="true"
+        android:padding="8dp"
+        android:src="@drawable/ic_action_down"  />
+
     <ImageView
         android:id="@+id/up"
         android:layout_width="40dp"