Question

我从SERVER提取了数据以填充RECYCLER视图
每个recyclerview行中都有一个imageview

当我单击该图像视图时，我想将可绘制对象加载到该图像视图中

holder.imageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {


        Drawable placeholder = holder.imageView.getContext().getResources().getDrawable(R.drawable.app);
        holder.imageView.setImageDrawable(placeholder);

    }
});

上面是我尝试过的内容，但是它说“持有人”需要声明为最终的，但实际上，我什至没有提到我可以写“最终持有人”之类的方式。

我的适配器代码：

public class ProductsAdapter extends 
RecyclerView.Adapter<ProductsAdapter.ProductViewHolder> {


private Context mCtx;
private List<Product> productList;

public ProductsAdapter(Context mCtx, List<Product> productList) {
    this.mCtx = mCtx;
    this.productList = productList;
}

@Override
public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(mCtx);
    View view = inflater.inflate(R.layout.product_list, null);
    return new ProductViewHolder(view);
}

@Override
public void onBindViewHolder(ProductViewHolder holder, int position) {
    final Product product = productList.get(position);

    //loading the image
    Glide.with(mCtx)
            .load(product.getImage())
            .into(holder.imageView);

    holder.textViewTitle.setText(product.getTitle());
    holder.textViewShortDesc.setText(product.getShortdesc());
    holder.textViewRating.setText(String.valueOf(product.getRating()));
    holder.textViewPrice.setText(String.valueOf(product.getPrice()));


    holder.imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            Drawable placeholder = holder.imageView.getContext().getResources().getDrawable(R.drawable.app);
            holder.imageView.setImageDrawable(placeholder);

        }
    });



        }

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

class ProductViewHolder extends RecyclerView.ViewHolder {

    TextView textViewTitle, textViewShortDesc, textViewRating, textViewPrice;
    ImageView imageView;

    public ProductViewHolder(View itemView) {
        super(itemView);

        textViewTitle = itemView.findViewById(R.id.textViewTitle);
        textViewShortDesc = itemView.findViewById(R.id.textViewShortDesc);
        textViewRating = itemView.findViewById(R.id.textViewRating);
        textViewPrice = itemView.findViewById(R.id.textViewPrice);
        imageView = itemView.findViewById(R.id.imageView);
    }
}
}

Answer 1

您可以在方法标题中声明所有者final

public void onBindViewHolder(final ProductViewHolder holder, int position) {
    Your code here
}

Answer 2

有几种解决方案：

1）让您的持有人做最后的决定

IF /I %OSV% LSS 3 (
    IF "!M%MAP%%1:~0,1!" == "0" (call :checkplayer %2 %%G %X% || CALL :C 00 " ")
    IF "!M%MAP%%1:~1,1!" == "1" (call :checkplayer %2 %%G %X% || CALL :C 2A "w")
    IF "!M%MAP%%1:~2,1!" == "2" (call :checkplayer %2 %%G %X% || CALL :C 87 "S")
    ...
)

:checkplayer
IF "%1" == "1" IF "%2" == "%3" (
    CALL :C 0C "i"
    exit /b 0
) ELSE (
    exit /b 1
)

或使用其他变量

@Override
public void onBindViewHolder(final ProductViewHolder holder, int position)

2）在特定视图上设置ClickListener时，请确保只有那个视图将触发操作，以便您可以使用该知识

final Holder finalHolder = holder;
holder.imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            Drawable placeholder = finalHolder.imageView.getContext().getResources().getDrawable(R.drawable.app);
            holder.imageView.setImageDrawable(placeholder);

        }
    });

单击项目后，如何从RecyclerView适配器内部的drawable更改imageView的图像？

2 个答案: