我有一个显示RecyclerView
的片段。我目前正在这样处理我的holder类中的onclick
事件:
public class CategoryHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ImageView categoryImageView;
public TextView categoryNameTextView;
public TextView categoryAmountTextView;
ArrayList<Category> categoriesArrayList = new ArrayList<>();
Context context;
public CategoryHolder(View itemView, Context context, ArrayList<Category> categories) {
super(itemView);
this.categoriesArrayList = categories;
this.context = context;
itemView.setOnClickListener(this);
this.categoryImageView = (ImageView) itemView.findViewById(R.id.categoryImageView);
this.categoryNameTextView = (TextView) itemView.findViewById(R.id.categoryNameTextView);
this.categoryAmountTextView = (TextView) itemView.findViewById(R.id.categoryAmountTextView);
}
@Override
public void onClick(View v) {
int position = getAdapterPosition();
Category category = this.categoriesArrayList.get(position);
Toast.makeText(context, ""+category.getCategoryName() + position,
}
}
如您所见,我已经在holder类中实现了
OnClickListener
,然后在Holder中实现了setTheOnItemClickListner。在我的适配器中,我将持有者类与数据一起传递给arraylist,如下所示:
Context context;
ArrayList<Category> categories;
public CategoriesAdapter(Context context, ArrayList<Category> categories) {
this.context = context;
this.categories = categories;
}
@Override
public CategoryHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.categorylist_singlecell, parent, false);
CategoryHolder holder = new CategoryHolder(v, context, categories);
return holder;
}
创建新的持有人时,我正在传递数据。
这可以正常工作,我可以从
ArrayList
的RecyclerView
中获取位置和任何数据。我想做的是在初始化
RecyclerView
和适配器的主片段中使用它。@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_nested_youtube_video_selection, container, false);
//////////////////////////// CATEGORIES RECYCLER /////////////////////////////////////
// Initialise the categories Recylerview
LinearLayoutManager categoriesLayoutManger = new LinearLayoutManager(getActivity());
categoriesLayoutManger.setOrientation(LinearLayoutManager.HORIZONTAL);
categoriesRecyclerView = (RecyclerView) view.findViewById(R.id.youtubeAlarmCategoryRecyclerView);
categoriesRecyclerView.setLayoutManager(categoriesLayoutManger);
// Get the data for the categories RecyclerView
categoryArraylist = CategoryCollection.getCategoryArrayList();
// Initialse the categories RecyclerView Adapter
categoriesAdapter = new CategoriesAdapter(getActivity(), categoryArraylist);
// Bind the categories Adapter to the categories RecyclerView
categoriesRecyclerView.setAdapter(categoriesAdapter);
我在想我需要一个接口,但是我不确定该怎么做,或者那是否是最好的方法。
最佳答案
以下应该工作:
onClickListener
,该事件将事件传递给这是一个例子:
界面
public interface ItemClickListener {
void onItemClicked(ViewHolder vh, Object item, int pos);
}
public interface GenericItemClickListener<T, VH extends ViewHolder> {
void onItemClicked(VH vh, T item, int pos);
}
ViewHolder
public class CategoryHolder extends RecyclerView.ViewHolder {
public CategoryHolder(View itemView, Context context) {
super(itemView);
this.context = context;
this.categoryImageView = (ImageView) itemView.findViewById(R.id.categoryImageView);
this.categoryNameTextView = (TextView) itemView.findViewById(R.id.categoryNameTextView);
this.categoryAmountTextView = (TextView) itemView.findViewById(R.id.categoryAmountTextView);
}
}
适配器
Context context;
ArrayList<Category> categories;
ItemClickListener itemClickListener;
public CategoriesAdapter(Context context, ArrayList<Category> categories, ItemClickListener itemClickListener) {
this.context = context;
this.categories = categories;
this.itemClickListener = itemClickListener;
}
// DON'T PASS YOUR DATA HERE, just create a ViewHolder
@Override
public CategoryHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.categorylist_singlecell, parent, false);
CategoryHolder holder = new CategoryHolder(v, context);
return holder;
}
//HERE you bind one item of your list to the view holder
@Override
public void onBindViewHolder(final CategoryHolder vh, final int i) {
final Category category = categories.get(i);
// set click listener
vh.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemClickListener.onItemClicked(vh, category, i);
}
});
// update images and texts...
}
编辑
更新了代码以向您显示,您不应将项目数组传递给每个视图持有者...创建并重复使用视图持有者,仅更新
onBindViewHolder
中的视图持有者并将视图持有者实例绑定到那里的正确数据。 ..顺便说一句,我改为创建一个通用接口,它更加美丽……我的示例只是一个简单的解决方案……
Edt 2-如何创建接口实例
ItemClickListener listener = new ItemClickListener(){
@Override
public void onItemClicked(RecyclerView.ViewHolder vh, Object item, int pos){
Toast.makeText(getActivity(), "Item clicked: " + pos, Toast.LENGTH_SHORT).show();
}
};