可点击图像没有响应片段中的 RecyclerView.setOnClickListener()... 为什么？答案

【问题标题】：Clickable image not responding with a RecyclerView.setOnClickListener() in a Fragment... Why?可点击图像没有响应片段中的 RecyclerView.setOnClickListener()... 为什么？
【发布时间】：2019-05-01 03:19:49
【问题描述】：

我已经设置了一个 recyclerView，它在一个片段中包含 4 个图像。我希望在单击图像后出现敬酒。我已经成功设置了 recyclerAdapter 并在主要活动中实现了一个监听器。我应该尝试从 recyclerAdapter 而不是 recyclerView 设置可点击的图像吗？感谢您的帮助！

public class topFragment extends Fragment {
    RecyclerView recyclerView;
    private int[] images = {R.drawable.1, R.drawable.2, R.drawable.3, R.drawable.4};
    private RecyclerView.LayoutManager layoutManager;
    private RecyclerAdapter recyclerAdapter;
    private OnImageListener onImageListener;

    public interface OnImageListener{
        public void onImageListener(int[] i);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.top_fragment_layout, container, false);
        recyclerView=view.findViewById(R.id.recyclerView);
        layoutManager = new GridLayoutManager(getContext(), 4);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(layoutManager);
        recyclerAdapter = new RecyclerAdapter(images);
        recyclerView.setAdapter(recyclerAdapter);

        recyclerView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //RecyclerView.ViewHolder viewHolder= new RecyclerAdapter.ImageViewHolder(view.findViewById(R.id.album));
                for(int i=0; i<images.length; i++){
                    RecyclerAdapter rA = new RecyclerAdapter(images);
                    if (rA.equals(0)){
                        Toast.makeText(getContext(), "1!", Toast.LENGTH_SHORT).show();
                    }
                    if (rA.equals(1)){
                        Toast.makeText(getContext(), "2!", Toast.LENGTH_SHORT).show();
                    }
                    if (rA.equals(2)){
                        Toast.makeText(getContext(), "3!", Toast.LENGTH_SHORT).show();
                    }
                    if (rA.equals(3)){
                        Toast.makeText(getContext(), "4!", Toast.LENGTH_SHORT).show();
                    }
                    onImageListener.onImageListener(images);
                }
            }
        });
        return view;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        Activity activity = (Activity)context;
        try{
            onImageListener = (OnImageListener)activity;
        }
        catch (ClassCastException e){
            throw new ClassCastException(activity.toString()+"must implement onImage...");
        }
    }
}

【问题讨论】：

“我应该尝试从 recyclerAdapter 而不是 recyclerView 设置可点击的图像吗？” – 基本上，是的。 RecyclerView 不会触发 OnClickListener。以this post 为例。

标签： android android-recyclerview fragment clickable

【解决方案1】：

是的。您必须从适配器设置图像视图的侦听器...类似于下面的 sn-p...

public class YourAdapter extends RecyclerView.Adapter<YourAdapter.ViewHolder> {

    private OnImageClickedListener listener;

    public void setListener(OnImageClickedListener listener){
         this.listener = listener;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        public ImageView imageView;

        private ViewHolder(View root) {

            super(root);

            imageView = root.findViewById(R.id.imageView);
            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(listener != null) listener.onImageClicked(v.getTag());
                }
            });
        }
    }

    public interface OnImageClickedListener {
        void onImageClicked(Object tag);
    }
}

你会像下面这样使用它......

YourAdapter adapter = new YourAdapter();
adapter.setListener(new YourAdapter.OnImageClickedListener{

   public void onImageClicked(){
       //TODO: display that toast
   }
});

【讨论】：