ListItemProvider.java
/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.car.widget;
import androidx.annotation.NonNull;
import java.util.List;
/**
* Supplies data as {@link ListItem}.
*
* @param <VH> class that extends {@link ListItem.ViewHolder}.
*/
public abstract class ListItemProvider<VH extends ListItem.ViewHolder> {
/**
* Returns {@link ListItem} at requested position.
*/
public abstract @NonNull ListItem<VH> get(int position);
/**
* @return number of total items.
*/
public abstract int size();
/**
* A simple provider that wraps around a list.
*
* @param <VH> class that extends {@link ListItem.ViewHolder}.
*/
public static class ListProvider<VH extends ListItem.ViewHolder> extends ListItemProvider {
private final List<ListItem<VH>> mItems;
public ListProvider(@NonNull List<ListItem<VH>> items) {
mItems = items;
}
@Override
public @NonNull ListItem<VH> get(int position) {
return mItems.get(position);
}
@Override
public int size() {
return mItems.size();
}
}
}