Listview 显示错误的数据

Question

我在 Android Studio + Firebase 中有一个简单的聊天应用程序，我正在显示用户电子邮件、消息以及日期和时间。问题是即使聊天室是空的，没有消息，列表视图项目的日期仍然显示，并且出于某种奇怪的原因显示 01-01-1970。

问题截图

chatMessage.setText(model.getChatMessage());
author.setText(model.getAuthor());
chatTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",model.getChatTime()));

public class chatAppGetter {

private String chatMessage;
private String author;
private String username;
private long chatTime;



public chatAppGetter(String chatMessage, String author) {
    this.chatMessage = chatMessage;
    this.author = author;

    chatTime = new Date().getTime();
}

public chatAppGetter() {
}

public String getChatMessage() {
    return chatMessage;
}

public void setChatMessage(String chatMessage) {
    this.chatMessage = chatMessage;
}

public long getChatTime() {
    return chatTime;
}

public void setChatTime(long chatTime) {
    this.chatTime = chatTime;
}

public String getAuthor() {
    return author;
}

public void setAuthor(String author) {
    this.author = author;
}
}


ListView messageList = (ListView)findViewById(R.id.listview);
    mAdapter = new FirebaseListAdapter<chatAppGetter>(this,    chatAppGetter.class, R.layout.chat_items, FirebaseDatabase.getInstance().getReference()) {
        @Override
        protected void populateView(View v, chatAppGetter model, int position) {

            TextView chatMessage, author, chatTime;
            chatMessage = (TextView)v.findViewById(R.id.chat_message);
            author = (TextView)v.findViewById(R.id.chat_user);
            chatTime = (TextView)v.findViewById(R.id.chat_time);

编辑：

问题解决了。我必须为消息创建一个单独的数据库分支。

Answer 1

  final Calendar c = Calendar.getInstance();       
  int  hour = c.get(Calendar.HOUR_OF_DAY);
  int minute = c.get(Calendar.MINUTE);    
  if (c.get(Calendar.AM_PM) == Calendar.AM){
     am_pm = "AM";
  }else if (c.get(Calendar.AM_PM) == Calendar.PM) 
     am_pm = "PM"; 

    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a");
    String formattedDate = df.format(c.getTime());        
    Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();

//现在使用 formattedDate 并将其传递给您的 setText。 //去JodaTime，让生活更轻松