Question

我正在处理一个消息传递应用程序。现在在对话活动中我想为发件人做一个选项可以删除他/她的消息。我用按钮做它并且工作正常。问题是我想用alertDialogBox来做。当发件人长按其消息时，会打开一个对话框，他可以删除该特定消息。由于我正在使用改造，我可以通过这种方式删除消息吗？

这是我的自定义适配器类：

public class Single_chat_adapter extends RecyclerView.Adapter{

private static final int VIEW_TYPE_MESSAGE_SENT = 1;
private static final int VIEW_TYPE_MESSAGE_RECEIVED = 2;


private Context mContext;
private List<Datum2> data;
private  String userID;

private UserAuthenticationKey userAuthenticationKey;
private SharedPreferences sharedPreferences;
private SharedPreferences.Editor editor;


public Single_chat_adapter(Context mContext, List<Datum2> data, String userID) {
    this.mContext = mContext;
    this.data = data;
    this.userID = userID;
}

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


// Determines the appropriate ViewType according to the sender of the message.
@Override
public int getItemViewType(int position) {
    Datum2 message = (Datum2) data.get(position);

    if (message.getOriginatorId().equals(userID)) {
        // If the current user is the sender of the message
        return VIEW_TYPE_MESSAGE_SENT;
    } else {
        // If some other user sent the message
        return VIEW_TYPE_MESSAGE_RECEIVED;
    }
}
// Inflates the appropriate layout according to the ViewType.
@Override
public RecyclerView.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {

    View view;
    if (viewType == VIEW_TYPE_MESSAGE_SENT) {
        view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_message_sent, parent, false);
        return new SentMessageHolder(view);

    } else if (viewType == VIEW_TYPE_MESSAGE_RECEIVED){
        view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_message_received, parent, false);
        return new ReceivedMessageHolder(view);
    }
    return null;
}
// Passes the message object to a ViewHolder so that the contents can be bound to UI.
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    Datum2 message = (Datum2) data.get(position);

    switch (holder.getItemViewType()) {
        case VIEW_TYPE_MESSAGE_SENT:
            ((SentMessageHolder) holder).bind(message);

            break;
        case VIEW_TYPE_MESSAGE_RECEIVED:
            ((ReceivedMessageHolder) holder).bind(message);
    }

    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(final View view) {

            return false;
        }
    });

}

// Sent message view holder
private class SentMessageHolder extends RecyclerView.ViewHolder {
    TextView messageText, timeText;
    ImageButton iB;
    MsgDltAPIService msgDltAPIService;
    String rec_id;
    String content_id;
    final int[] ids = new int[100];

    SentMessageHolder(final View itemView) {
        super(itemView);

        messageText = itemView.findViewById(R.id.text_message_body);
        timeText = itemView.findViewById(R.id.text_message_time);
        iB = itemView.findViewById(R.id.sentMessageTextDelete);
        msgDltAPIService = RestClient.getClient().create(MsgDltAPIService.class);

        iB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                userAuthenticationKey = new UserAuthenticationKey(mContext.getApplicationContext());
                sharedPreferences =  mContext.getApplicationContext().getSharedPreferences("user authentication", MODE_PRIVATE);
                editor = sharedPreferences.edit();

                ids[0] = Integer.parseInt(content_id);

                if (!TextUtils.isEmpty(content_id) && TextUtils.isDigitsOnly(content_id)) {
                    ids[0] = Integer.parseInt(content_id);
                } else {
                    ids[0] = 0;
                }
                final MsgDltRequest msgDltRequest = new MsgDltRequest(
                        ids,
                        rec_id);
                Call<MsgDltResponse> call =
                        msgDltAPIService.msgDlt(userAuthenticationKey.getUserTokenKey(),
                                msgDltRequest);
                call.enqueue(new Callback<MsgDltResponse>() {
                    @Override
                    public void onResponse(Call<MsgDltResponse> call, Response<MsgDltResponse> response) {

                        Toast.makeText(mContext.getApplicationContext(), "message deleted",
                                Toast.LENGTH_LONG).show();
                    }

                    @Override
                    public void onFailure(Call<MsgDltResponse> call, Throwable t) {
                        Toast.makeText(mContext.getApplicationContext(), "please try again",
                                Toast.LENGTH_LONG).show();
                    }
                });
            }
        });
    }

    void bind(Datum2 message) {
        messageText.setText(message.getMsg());

        // Format the stored timestamp into a readable String using method.
        timeText.setText(message.getCreatedAt().getFormatTime());
        content_id = message.getContentId().toString();
        if (! message.getOriginatorId().equals(userID)){
            rec_id.valueOf(message.getOriginatorId());
        }
        else {
            rec_id = null;
        }
    }

}

// Received message view holder
private class ReceivedMessageHolder extends RecyclerView.ViewHolder {
    TextView messageText, timeText, nameText;
    //        ImageView profileImage;
    HexagonImageView profileImage;

    ReceivedMessageHolder(View itemView) {
        super(itemView);

        messageText = itemView.findViewById(R.id.text_message_body);
        timeText = itemView.findViewById(R.id.text_message_time);
        nameText = itemView.findViewById(R.id.text_message_name);
        profileImage = itemView.findViewById(R.id.image_message_profile);
    }

    void bind(Datum2 message) {
        messageText.setText(message.getMsg());

        // Format the stored timestamp into a readable String using method.
        timeText.setText(message.getCreatedAt().getFormatTime());
        nameText.setText(message.getOriginator().getFullName());

        // Insert the profile image from the URL into the ImageView.
        Glide.with(mContext).load("myweburl" + data.get(getLayoutPosition())
                .getOriginator().getAvatar()).apply(RequestOptions.circleCropTransform())
                .into(profileImage);
    }
}
}

我设置了一个名为 iB 的按钮，通过它我可以删除该消息。但不幸的是，我没有通过使用alertBox来做到这一点。

Answer 1

在on long pressed listener中，使用listener将消息对象传递给父activity / adapter，然后从parent打开一个将对象传递给它的对话框，现在删除数据时只需删除{{1并通知适配器

List<Datum2> data

父母的粗略实现将是

public class SingleChatAdapter extends RecyclerView.Adapter {
 // ...
 //... 
 @Override
 public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
   Datum2 message = (Datum2) data.get(position);
   switch (holder.getItemViewType()) {
    case VIEW_TYPE_MESSAGE_SENT:
     ((SentMessageHolder) holder).bind(message);
     break;
    case VIEW_TYPE_MESSAGE_RECEIVED:
     ((ReceivedMessageHolder) holder).bind(message);
   }
   holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(final View view) {
     mListener.onMessageLongPressed(message);
     return false;
    }
   });
  }
  // ....
  // ...

 // here is the listener interface parent need to implement
 public interface OnChildInteraction {
  public void onMessageLongPressed(Datum2 message);
 }
}

如何使用AdapterDialogBox从Adapter类中的api响应中删除消息

1 个答案: