【问题标题】:Firebase List Adapter Constructor errorFirebase 列表适配器构造函数错误
【发布时间】:2018-04-24 22:23:09
【问题描述】:

我创建了一个显示聊天消息的函数,我按照教程进行操作,还查看了 Firebase 列表适配器的文档,但无论我做什么,我都会收到此错误:

Error:(98, 19) error: constructor FirebaseListAdapter in class 
FirebaseListAdapter<T> cannot be applied to given types; 
required: FirebaseListOptions<ChatMessage>
found: Chat,Class<ChatMessage>,int,DatabaseReference
reason: actual and formal argument lists differ in length
where T is a type-variable:
T extends Object declared in class FirebaseListAdapter

这是我的代码:

private void displayChatMessage() {

    ListView listOfMessage = (ListView)findViewById(R.id.list_of_messages);

    FirebaseRecyclerOptions<ChatMessage> options =
            new FirebaseRecyclerOptions.Builder<ChatMessage>()
                    .setQuery(query, ChatMessage.class)
                    .build();
    adapter = new FirebaseListAdapter<ChatMessage, Holder>(options){
        @Override
        protected void populateView(View v, ChatMessage model, int position) {

            //Get references to the views of list_item.xml
            TextView messageText, messageUser, messageTime;
            messageText = (TextView) v.findViewById(R.id.message_text);
            messageUser = (TextView) v.findViewById(R.id.message_user);
            messageTime = (TextView) v.findViewById(R.id.message_time);

            messageText.setText(model.getMessageText());
            messageUser.setText(model.getMessageUser());
            messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));

        }
    };
    listOfMessage.setAdapter(adapter);
}

【问题讨论】:

    标签: java android firebase firebase-realtime-database firebaseui


    【解决方案1】:

    FirebaseUI 3.0+ 版本隐含以下内容

    删除这个:

       adapter = new FirebaseListAdapter<ChatMessage>(this,ChatMessage.class,R.layout.list_item,FirebaseDatabase.getInstance().getReference())
    

    你需要添加这个:

    FirebaseListOptions<ChatMessage> options =
                new FirebaseListOptions.Builder<ChatMessage>()
                        .setQuery(query, ChatMessage.class)
                         .setLayout(android.R.layout.simple_list_item_1)
                        .build();
     adapter = new FirebaseListAdapter<ChatMessage>(options){
    

    query 是您为列表适配器示例所做的查询:

    Query query = FirebaseDatabase.getInstance().getReference().child("chats");
    

    更多信息在这里:

    Using FirebaseUI to populate a ListView

    【讨论】:

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