本文介绍了FirebaseListAdapter<>无法运作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在关注此教程,以创建聊天应用.这是我的displayChatMessages()
方法:
I am following this tutorial to create a chat app. This is my displayChatMessages()
method:
ListView listOfMessages = (ListView)findViewById(R.id.list_of_messages);
adapter = new FirebaseListAdapter<ChatMessages>(this, ChatMessages.class, R.layout.message, FirebaseDatabase.getInstance().getReference()) {
@Override
protected void populateView(View v, ChatMessages model, int position) {
// Get references to the views of message.xml
TextView messageText = (TextView)v.findViewById(R.id.message_text);
TextView messageTime = (TextView)v.findViewById(R.id.message_time);
// Set their text
messageText.setText(model.getMessageBody());
// Format the date before showing it
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));
}
};
listOfMessages.setAdapter(adapter);
但是我在这部分上有一个红色下划线:
But I get a red underline at this part:
(this, ChatMessages.class, R.layout.message, FirebaseDatabase.getInstance().getReference())
Android Studio说
Android Studio says
更新:这是错误消息:
推荐答案
感谢完整的错误消息-这很有帮助.基于此,我认为这是您需要做的.
Thanks for complete error message - this helps greatly.Based on that, I think this is what you need to do.
//Suppose you want to retrieve "chats" in your Firebase DB:
Query query = FirebaseDatabase.getInstance().getReference().child("chats");
//The error said the constructor expected FirebaseListOptions - here you create them:
FirebaseListOptions<ChatMessage> options = new FirebaseListOptions.Builder<ChatMessage>()
.setQuery(query, ChatMessages.class)
.setLayout(android.R.layout.message)
.build();
//Finally you pass them to the constructor here:
adapter = new FirebaseListAdapter<ChatMessages>(options){
@Override
protected void populateView(View v, ChatMessages model, int position) {
// Get references to the views of message.xml
TextView messageText = (TextView)v.findViewById(R.id.message_text);
TextView messageTime = (TextView)v.findViewById(R.id.message_time);
// Set their text
messageText.setText(model.getMessageBody());
// Format the date before showing it
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));
}
};
这是文章,其中存在相同的问题
Here is an article where the same issue was encountered.
这篇关于FirebaseListAdapter<>无法运作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!