Question

我正在开发一个聊天应用程序。当您进入聊天时，您可以将所有收到的消息设置为已显示。但是在其他设备中如果我也在聊天中，则每条消息的布尔“看见”都不会更新。我的意思是当看到发送消息时，会出现“看到”的文本视图。但是我必须出去回到聊天活动才能看到textview。

这是onBindViewHolder void：

@Override
public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
    holder.isRecyclable();

    Messages messages = userMessages.get(position);

    String user_id = mAuth.getCurrentUser().getUid().toString();
    String from_user_id = messages.getSender();

    holder.seenView.setVisibility(View.GONE);

    if(user_id.equals(from_user_id)){
        //I send the message
        holder.layout.setBackgroundResource(R.drawable.text_message_bg);
        holder.messageText.setTextColor(Color.WHITE);
        holder.msgParams.gravity = Gravity.RIGHT;
        holder.messageText.setLayoutParams(holder.msgParams);
        holder.dateParams.gravity = Gravity.RIGHT;
        holder.messageDate.setLayoutParams(holder.dateParams);
        holder.params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

        if(messages.isSeen() && position == getItemCount() - 1){
            holder.seenView.setVisibility(View.VISIBLE);
        }
    } else {
        //I receive the message
        holder.layout.setBackgroundResource(R.drawable.text_message_bg_2);
        holder.messageText.setTextColor(Color.BLACK);
        holder.msgParams.gravity = Gravity.LEFT;
        holder.messageText.setLayoutParams(holder.msgParams);
        holder.dateParams.gravity = Gravity.RIGHT;
        holder.messageDate.setLayoutParams(holder.dateParams);
        holder.params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        mDatabase.child(user_id).child(from_user_id).child("messages").child(messages.getId()).child("seen").setValue(true);
        mDatabase.child(from_user_id).child(user_id).child("messages").child(messages.getId()).child("seen").setValue(true);
    }

    holder.getAdapterPosition();

    //Poner texto
    holder.messageText.setText(messages.getMessage());
    holder.messageDate.setText(messages.getTime());
}

我的loadMessages无效：

private void loadMessages() {

    mRootRef.child("messages").child(mCurrentUser).child(userKey).child("messages").addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {

            Messages messages = dataSnapshot.getValue(Messages.class);

            messagesList.add(messages);
            messageAdapter.notifyDataSetChanged();
            recyclerView.scrollToPosition(messagesList.size() - 1);

        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });


}

我试图在onChildChanged中添加“刷新”，但它只是添加了消息的项目副本......

我期待着您的回复！

编辑：我的整个适配器：

public class MessageAdapter extends RecyclerView.Adapter<MessageAdapter.MessageViewHolder> {

private List<Messages> userMessages;

private FirebaseAuth mAuth;
private DatabaseReference mDatabase;

public MessageAdapter(List<Messages> userMessages) {
    this.userMessages = userMessages;
}

public void setData(List<Messages> newData) {
    this.userMessages.clear();
    userMessages.addAll(newData);
    notifyDataSetChanged();
}

@Override
public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View V = LayoutInflater.from(parent.getContext()).inflate(R.layout.message_single_layout, parent, false);

    mAuth = FirebaseAuth.getInstance();

    mDatabase = FirebaseDatabase.getInstance().getReference().child("messages");

    return new MessageViewHolder(V);
}

@Override
public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
    holder.isRecyclable();

    Messages messages = userMessages.get(position);

    String user_id = mAuth.getCurrentUser().getUid().toString();
    String from_user_id = messages.getSender();

    holder.seenView.setVisibility(View.GONE);

    if(user_id.equals(from_user_id)){
        //Yo envié el mensaje
        holder.layout.setBackgroundResource(R.drawable.text_message_bg);
        holder.messageText.setTextColor(Color.WHITE);
        holder.msgParams.gravity = Gravity.RIGHT;
        holder.messageText.setLayoutParams(holder.msgParams);
        holder.dateParams.gravity = Gravity.RIGHT;
        holder.messageDate.setLayoutParams(holder.dateParams);
        holder.params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

        if(messages.isSeen() && position == getItemCount() - 1){
            holder.seenView.setVisibility(View.VISIBLE);
        }
    } else {
        //Recivo el mensaje
        holder.layout.setBackgroundResource(R.drawable.text_message_bg_2);
        holder.messageText.setTextColor(Color.BLACK);
        holder.msgParams.gravity = Gravity.LEFT;
        holder.messageText.setLayoutParams(holder.msgParams);
        holder.dateParams.gravity = Gravity.RIGHT;
        holder.messageDate.setLayoutParams(holder.dateParams);
        holder.params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        mDatabase.child(user_id).child(from_user_id).child("messages").child(messages.getId()).child("seen").setValue(true);
        mDatabase.child(from_user_id).child(user_id).child("messages").child(messages.getId()).child("seen").setValue(true);
    }

    holder.getAdapterPosition();

    //Poner texto
    holder.messageText.setText(messages.getMessage());
    holder.messageDate.setText(messages.getTime());
}

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

public class MessageViewHolder extends RecyclerView.ViewHolder {

    public TextView messageText;
    public TextView messageDate;
    public TextView seenView;
    public LinearLayout layout;
    public RelativeLayout.LayoutParams params;
    public LinearLayout.LayoutParams dateParams;
    public LinearLayout.LayoutParams msgParams;

    public MessageViewHolder(View itemView) {
        super(itemView);
        messageText = itemView.findViewById(R.id.messageTextView);
        messageDate = itemView.findViewById(R.id.dateTextView);
        seenView = itemView.findViewById(R.id.visto);
        layout = itemView.findViewById(R.id.messageSingleLayout);
        params = (RelativeLayout.LayoutParams)layout.getLayoutParams();
        dateParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        msgParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    }
}

}

Answer 1

您只处理了添加新消息的事件，如果已更新，您必须处理该事件

module.js:549
throw err;
^

Error: Cannot find module 
'C:\Users\akmal\AppData\Local\Temp\npm.5980\package\bin\npm-cli.js'
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Function.Module.runMain (module.js:693:10)
at startup (bootstrap_node.js:188:16)
at bootstrap_node.js:609:3

Android - Recyclerview不会更新商品信息

1 个答案: