【发布时间】：2018-03-28 03:19:02
【问题描述】：
我正在开发一个聊天应用程序。当您进入聊天时，您将所有收到的消息设置为所见。但在另一台设备中，如果我也在聊天中，则每条消息的布尔“看到”不会更新。我的意思是当看到发送消息时，会出现一个“看到”的文本视图。但是我必须出去回到聊天活动才能看到那个文本视图。
这里是 onBindViewHolder 无效：
@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) {
}
});
}
我尝试在 onChildChanged 中添加“刷新”，但它只是添加了消息的项目副本...
期待您的来信！
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);
}
}
}
【问题讨论】：
-
使用 recyclerview 显示用于设置适配器的代码
-
我把整个适配器放在那里！
-
我认为您应该使用 FirebaseRecyclerAdapter 进行实施，这样子数据的任何更改都将得到处理，而无需任何额外的努力。我在实施时遇到了同样的问题，我选择了 FirebaseRecyclerAdapter，我的聊天应用现在运行顺利。
-
如果您愿意，只需更换适配器即可。
-
同时添加 ELSE 条件。
标签： android firebase android-recyclerview