DEV/material-components_material-components-android
1
0
Fork 0
mirror of https://github.com/material-components/material-components-android.git synced 2026-02-20 08:39:55 +08:00
Code Issues Packages Projects Releases Wiki Activity

[Catalog] Update Lists demo to re-use viewholder when calling adapter.notifyItemChanged

Browse Source 
PiperOrigin-RevId: 864964451
This commit is contained in:
rightnao 2026-02-03 19:18:16 +00:00 committed by pekingme
parent ac4f111b90
commit 77cabd0cf5
1 changed files with 26 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
catalog/java/io/material/catalog/listitem/SegmentedListDemoFragment.java
View File

@ -100,26 +100,42 @@ public class SegmentedListDemoFragment extends ListsMainDemoFragment {
/* attachToRoot= */ false);
return new CustomItemViewHolder(item);
}
@Override
public void onBindViewHolder(@NonNull CustomItemViewHolder viewHolder, int position) {
CustomListItemData data = getItemAt(position);
viewHolder.bind(data, position, getItemCount());
}
@Override
public void onBindViewHolder(
@NonNull CustomItemViewHolder viewHolder, int position) {
CustomListItemData data = getItemAt(position);
viewHolder.bind(data);
@NonNull CustomItemViewHolder viewHolder, int position, @NonNull List<Object> payloads) {
if (payloads.isEmpty()) {
super.onBindViewHolder(viewHolder, position, payloads);
} else {
// Partial update: just re-bind.
CustomListItemData data = getItemAt(position);
viewHolder.bind(data, position, getItemCount());
}
}
@Override
public int getItemCount() {
return items.size();
}
@NonNull
public CustomListItemData getItemAt(int i) {
return items.get(i);
}
/**
* Set exclusive selected position.
*/
public void setSelectedPosition(int selectedPosition) {
this.selectedPosition = selectedPosition;
}
/**
* Return exclusive selected position.
*/
@ -127,6 +143,7 @@ public class SegmentedListDemoFragment extends ListsMainDemoFragment {
return selectedPosition;
}
}
/** A ViewHolder that shows custom list items */
public class CustomItemViewHolder extends ListItemViewHolder {
private final TextView textView;
@ -137,8 +154,9 @@ public class SegmentedListDemoFragment extends ListsMainDemoFragment {
textView = itemView.findViewById(R.id.cat_list_item_text);
cardView = itemView.findViewById(R.id.cat_list_item_card_view);
}
public void bind(@NonNull CustomListItemData data) {
super.bind();
public void bind(@NonNull CustomListItemData data, int position, int totalCount) {
super.bind(position, totalCount);
textView.setText(data.text);
cardView.setChecked(data.indexInSection == adapter.getSelectedPosition());
cardView.setOnClickListener(
@ -147,9 +165,10 @@ public class SegmentedListDemoFragment extends ListsMainDemoFragment {
adapter.setSelectedPosition(data.indexInSection);
Toast.makeText(v.getContext(), R.string.mtrl_list_item_clicked, Toast.LENGTH_SHORT)
.show();
adapter.notifyItemChanged(data.indexInSection);
// Pass a payload to prevent the RecyclerView default change animation
adapter.notifyItemChanged(data.indexInSection, "selection_changed");
if (previouslySelectedPosition != NO_SELECTION) {
adapter.notifyItemChanged(previouslySelectedPosition);
adapter.notifyItemChanged(previouslySelectedPosition, "selection_changed");
}
});
}