回收站视图 Onclick 以打开卡片视图中存在数据的对话框

Question

我正在尝试在我的RecyclerView 上实现 Onclick。我尝试了很多方法，但最终导致我的应用程序崩溃。我还希望在单击任何cardView 时有一个对话框。

我使用 fireBase 作为我的后端，我对此很陌生。

这是我的适配器类：

public class BlogRecyclerAdapter extends RecyclerView.Adapter<BlogRecyclerAdapter.ViewHolder> {
    public List<BlogPost>blogList;
    public Context context;
    private FirebaseFirestore firebaseFirestore;

    private static final int SECOND_MILLIS = 1000;
    private static final int MINUTE_MILLIS = 60 * SECOND_MILLIS;
    private static final int HOUR_MILLIS = 60 * MINUTE_MILLIS;
    private static final int DAY_MILLIS = 24 * HOUR_MILLIS;
    String dateString;

    public  BlogRecyclerAdapter(List<BlogPost>blogList){
        this.blogList=blogList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull final ViewGroup parent, int viewType) {
        View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.blog_list_item,parent,false);
        context=parent.getContext();
        firebaseFirestore=FirebaseFirestore.getInstance();
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
        String descData=blogList.get(position).getDesc();
        holder.setDescText(descData);
        String imageUrl=blogList.get(position).getImage_url();
        holder.setBlogImage(imageUrl);
        final String userId=blogList.get(position).getUser_id();
        firebaseFirestore.collection("Users").document(userId).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                if(task.isSuccessful()){
                    String username=task.getResult().getString("Name");
                    holder.setUserData(username);
                }
                else{

                }
            }
        });

        long miliseconds=blogList.get(position).getTimestamp().getTime();
        long now = System.currentTimeMillis();

        final long diff = now - miliseconds;
        if (diff < MINUTE_MILLIS) {
             dateString= "just now";
        } else if (diff < 2 * MINUTE_MILLIS) {
             dateString= "a minute ago";
        } else if (diff < 50 * MINUTE_MILLIS) {
             dateString= diff / MINUTE_MILLIS + " minutes ago";
        } else if (diff < 90 * MINUTE_MILLIS) {
             dateString= "an hour ago";
        } else if (diff < 24 * HOUR_MILLIS) {
             dateString= diff / HOUR_MILLIS + " hours ago";
        } else if (diff < 48 * HOUR_MILLIS) {
             dateString= "yesterday";
        } else {
             dateString= diff / DAY_MILLIS + " days ago";
        }
        // String dateString= DateFormat.format("MM/dd/yyyy",new Date(miliseconds)).toString();
        holder.setTime(dateString);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder{
        private View mView;
        private TextView descView;
        private ImageView blogImageView;
        private TextView blogDate;
        private TextView blogUserName;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            mView=itemView;
        }

        public void setUserData(String name){
            blogUserName=mView.findViewById(R.id.blogUserName);
            blogUserName.setText(name);
        }

        public void setDescText(String descText){
            descView=mView.findViewById(R.id.blogDesc);
            descView.setText(descText);
        }

        public void setBlogImage(String downloaduri){
            blogImageView=mView.findViewById(R.id.blogImage);
            Glide.with(context).load(downloaduri).apply(RequestOptions.bitmapTransform(new BlurTransformation(30,3))).into(blogImageView);
        }

        public void setTime(String date){
            blogDate=mView.findViewById(R.id.blogDate);
            blogDate.setText(date);
        }
    }
}

我尝试了很多实现方法，但都不成功。

Answer 1

给RecyclerView添加onClickListener是一个比ListView痛苦的过程。但是有办法做到这一点。

1. 首先，将此类添加到您的适配器中。

   public static class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
   private OnItemClickListener mListener;
   
   public interface OnItemClickListener {
       public void onItemClick(View view, int position);
   
       public void onLongItemClick(View view, int position);
   }
   
   GestureDetector mGestureDetector;
   
   public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener) {
       mListener = listener;
       mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
           @Override
           public boolean onSingleTapUp(MotionEvent e) {
               return true;
           }
   
           @Override
           public void onLongPress(MotionEvent e) {
               View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
               if (child != null && mListener != null) {
                   mListener.onLongItemClick(child, recyclerView.getChildAdapterPosition(child));
               }
           }
       });
   }
   
   @Override public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
       View childView = view.findChildViewUnder(e.getX(), e.getY());
       if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
           mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
           return true;
       }
       return false;
   }
   
   @Override public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) { }
   
   @Override
   public void onRequestDisallowInterceptTouchEvent (boolean disallowIntercept){}
   }
   

2. 其次，将此侦听器添加到您的活动/片段中

   recyclerView.addOnItemTouchListener(new BlogRecyclerAdapter.RecyclerItemClickListener(getActivity(), recyclerView ,new BlogRecyclerAdapter.RecyclerItemClickListener.OnItemClickListener() {
                   @Override public void onItemClick(View view, int position) {
   
                       // Do something here...
                   }
   
                   @Override public void onLongItemClick(View view, int position) {
   
                   }
               })
       );