Question

我创建了一个基础recyclerview，而我的另一个类正在扩展基类。我已经实现了butterknife。但是当另一个类扩展基类时，我将视图视为null。

以下是我的基类

public abstract class BaseAdapter<T>
        extends RecyclerView.Adapter<BaseAdapter.MyViewHolder> {

    private List<T> mObjects;
    private Context context;

    public BaseAdapter(final List<T> objects, Context context) {
        this.mObjects = objects;
        this.context = context;
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(getActivityLayout(), parent, false);
        ButterKnife.bind(this,parent);
        return new MyViewHolder(itemView);
    }
    /**
     * Adds the specified object at the end of the array.
     *
     * @param object The object to add at the end of the array.
     */
    public void add(final T object) {
        mObjects.add(object);
        notifyItemInserted(getItemCount() - 1);
    }

    /**
     * Remove all elements from the list.
     */
    public void clear() {
        final int size = getItemCount();
        mObjects.clear();
        notifyItemRangeRemoved(0, size);
    }

    @Override
    public int getItemCount() {
        return mObjects.size();
    }

    public T getItem(final int position) {
        return mObjects.get(position);
    }

    public long getItemId(final int position) {
        return position;
    }

    /**
     * Returns the position of the specified item in the array.
     *
     * @param item The item to retrieve the position of.
     * @return The position of the specified item.
     */
    public int getPosition(final T item) {
        return mObjects.indexOf(item);
    }

    /**
     * Inserts the specified object at the specified index in the array.
     *
     * @param object The object to insert into the array.
     * @param index  The index at which the object must be inserted.
     */
    public void insert(final T object, int index) {
        mObjects.add(index, object);
        notifyItemInserted(index);

    }

    /**
     * Removes the specified object from the array.
     *
     * @param object The object to remove.
     */
    public void remove(T object) {
        final int position = getPosition(object);
        mObjects.remove(object);
        notifyItemRemoved(position);
    }

    /**
     * Sorts the content of this adapter using the specified comparator.
     *
     * @param comparator The comparator used to sort the objects contained in this adapter.
     */
    public void sort(Comparator<? super T> comparator) {
        Collections.sort(mObjects, comparator);
        notifyItemRangeChanged(0, getItemCount());
    }
    public class MyViewHolder extends RecyclerView.ViewHolder {

        public MyViewHolder(View view) {
            super(view);
        }
    }
    protected abstract int getActivityLayout();
}

以下是我的子类

    public class SubRecyclerAdapter extends BaseAdapter {

        private Context context;
        private List<LocationList> getLocationLists;
        @Nullable
        @BindView(R.id.branchimage)
        ImageView branchimage;
        public SubRecyclerAdapter(List<LocationList> getLocationLists,Context context) {
            super(getLocationLists,context);
            this.context=context;
            this.getLocationLists=getLocationLists;
        }

        @Override
        protected int getActivityLayout() {
            return R.layout.locationlist;
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            Picasso.with(context) .load(getLocationLists.get(position).getBranch_image()) .placeholder(R.drawable.dummy_image)
                    .error(R.drawable.dummy_image) .into(branchimage);
//branchimage is null here
        }

Butterknife版本： -

 compile 'com.jakewharton:butterknife:8.2.1'
 apt 'com.jakewharton:butterknife-compiler:8.2.1'

Answer 1

如果你想在你的适配器中使用ButterKnife，你需要在你的视图持有者和onCreateViewHolder中这样做：

  //View Holder for performance optimizations of the recycler view display
    static class AddProductsViewHolder extends RecyclerView.ViewHolder{

        @InjectView(R.id.product_image)
        ImageView productImage;
        @InjectView(R.id.product_name)
        TextView productName;
        @InjectView(R.id.product_brand)
        TextView productBrand;

        public final View mView;

        public AddProductsViewHolder(View itemView) {
            super(itemView);
            mView = itemView;
            ButterKnife.inject(this, itemView);
        }
    }

 @Override
    public AddProductsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View productView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_row_products, parent, false);
        return new AddProductsViewHolder(productView);
    }

用法：

@Override
    public void onBindViewHolder(AddProductsViewHolder holder, int position) {

        try{
            AddProductInfo addProductInfo = addProductInfoList.get(position);

            if(!addProductInfo.getProductImage().isEmpty()){
            holder.productName.setText(addProductInfo.getProductName());
            holder.productBrand.setText(addProductInfo.getProductBrand());


        }
        catch (Exception e){

        }
    }

如果您有任何疑问，请在下面进行评论。

使用最新版本的butterknife，您只需要将@InjectView替换为@Bind
这是我的旧代码，但我认为这符合您的目的。

Butterknife不使用适配器类

1 个答案: