Question

我尝试使用Firebase进行聊天活动。我遇到了以下错误。任何帮助赞赏。这也是我的第一篇文章。如果我没有在正确的部分发布这个，我道歉。

错误

Process: com.synthetech.synergyeventmanager, PID: 650
              com.google.firebase.database.DatabaseException: Can't convert 
object of type java.lang.String to type 
com.synthetech.synergyeventmanager.MessageTemplate

CODE

ChatActivity.java

DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("Event/" + event_uid + "/Chat");

    FirebaseListAdapter<MessageTemplate> firebaseListAdapter = new FirebaseListAdapter<MessageTemplate>(
            this,
            MessageTemplate.class,
            R.layout.message_template,
            databaseReference.orderByKey()) {
        @Override
        protected void populateView(View v, MessageTemplate msg, int position) {

            TextView message = (TextView) findViewById(R.id.chatMessage);
            TextView user = (TextView) findViewById(R.id.chatUser);

            String chatMessageFetcher;
            String chatUserFetcher;

            chatMessageFetcher = msg.getMessage();
            chatUserFetcher = msg.getUser();

            message.setText(chatMessageFetcher);
            user.setText(chatUserFetcher);

        }
    };

    chatList.setAdapter(firebaseListAdapter);

MessageTemplate.java

public class MessageTemplate {

String message;
String user;


public MessageTemplate() {
}

public MessageTemplate(String message, String user) {
    this.message = message;
    this.user = user;
}

public String getMessage() {
    return message;
}


public String getUser() {
    return user;
  }
}

点按推送消息的方法

 @Override
 public void onClick(View v) {
    if (v == sendButton){
        String event_uid;
        String chat;
        event_uid = eventuid_txt.getText().toString();
        chat = message.getText().toString();
        FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
        MessageTemplate msg = new MessageTemplate(chat, 
firebaseAuth.getCurrentUser().getEmail());
        DatabaseReference chatRef= FirebaseDatabase.getInstance().getReference().child("Event/"+event_uid+"/Chat");
        chatRef.push().setValue(msg);
        message.setText("");
    }
}

JSON文件结构

{
  "Event" : {
    "Aseem_SDp3G2wfbBOGXsfPFWQBfVvj7wo2" : {
      "Chat" : {
         "
        "message" : "Hey there! ",
        "time" : 1492502099191,
        "user" : "aseem@synergy.io"
               }
   }
}

请注意：我已更改了代码。你在那里看到的消息是之前添加的。我现在添加了 .push（）方法。因此，一旦代码启动并运行，结构就会改变。目前的结构将是这样的 -

Event
    -Event_uid
        -Chat
            -Chat_uid
                -message
                -time
                -user

Firebase Android Chat Activity会在我访问它时立即崩溃

0 个答案: