我正在尝试创建聊天气泡，我需要在每个气泡中插入时间戳，我有适配器来插入消息，但是我不知道如何添加时间戳，有人可以告诉我怎么做。
以下是MainActivity代码：
public class MainActivity extends AppCompatActivity {
private ListView listView;
private View btnSend;
private EditText editText;
boolean myMessage = true;
private List<ChatBubble> ChatBubbles;
private ArrayAdapter<ChatBubble> adapter;
private TextView dateTimeTx;
private TextView dateTimeRx;
private String dateTime;
private String timestamp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ChatBubbles = new ArrayList<>();
listView = (ListView) findViewById(R.id.list_msg);
btnSend = findViewById(R.id.btn_chat_send);
editText = (EditText) findViewById(R.id.msg_type);
//set ListView adapter first
adapter = new MessageAdapter(this, R.layout.tx_chat_bubble, ChatBubbles);
listView.setAdapter(adapter);
//event for button SEND
btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (editText.getText().toString().trim().equals("")) {
Toast.makeText(MainActivity.this, "Please input some text...", Toast.LENGTH_SHORT).show();
} else {
//add message to list
ChatBubble ChatBubble = new ChatBubble(editText.getText().toString(), myMessage, timestamp.toString() );
ChatBubbles.add(ChatBubble);
adapter.notifyDataSetChanged();
editText.setText("");
if (myMessage) {
myMessage = false;
} else {
myMessage = true;
}
}
}
});
}
}
但是我有一个错误：
ChatBubble ChatBubble = new ChatBubble(editText.getText().toString(), myMessage, timestamp.toString() );
这是mi适配器代码：
public class MessageAdapter extends ArrayAdapter<ChatBubble> {
private Activity activity;
private List<ChatBubble> messages;
private String dateTime;
private SimpleDateFormat simpleDateFormat ;
public MessageAdapter(Activity context, int resource, List<ChatBubble> objects) {
super(context, resource, objects);
this.activity = context;
this.messages = objects;
String isoDatePattern = "dd/MM/yyyy HH:mm";
simpleDateFormat = new SimpleDateFormat(isoDatePattern);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
int layoutResource = 0; // determined by view type
ChatBubble ChatBubble = getItem(position);
int viewType = getItemViewType(position);
if (ChatBubble.myMessage()) {
layoutResource = R.layout.tx_chat_bubble;
} else {
layoutResource = R.layout.rx_chat_bubble;
}
if (convertView != null) {
holder = (ViewHolder) convertView.getTag();
} else {
convertView = inflater.inflate(layoutResource, parent, false);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
//set message content
holder.msg.setText(ChatBubble.getContent());
holder.dateTimeTx.setText(ChatBubble.getTimestamp());
return convertView;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
return position % 2;
}
private class ViewHolder {
private TextView msg;
private TextView dateTimeTx;
public ViewHolder(View v) {
msg = (TextView) v.findViewById(R.id.txt_msg);
dateTimeTx = (TextView) v.findViewById(R.id.time_msg);
}
}
private String readFechaActual(long timestamp){
return simpleDateFormat.format(new Date(timestamp));
}
}
但是我还有另一个错误：
holder.dateTimeTx.setText(ChatBubble.getTimestamp());
这是ChatBubble类：
public class ChatBubble {
private String content;
private boolean myMessage;
private long timestamp;
public ChatBubble(String content, boolean myMessage, long timestamp) {
this.content = content;
this.myMessage = myMessage;
this.timestamp = timestamp;
}
public String getContent() {
return content;
}
public boolean myMessage() {
return myMessage;
}
public long getTimestamp() {
return timestamp;
}
}
答案 0 :(得分：2)
SimpleDateFormat：private SimpleDateFormat simpleDateFormat ;
public MessageAdapter(Activity context, int resource, List<ChatBubble> objects) {
super(context, resource, objects);
this.activity = context;
this.messages = objects;
String isoDatePattern = "dd/MM/yyyy HH:mm";
simpleDateFormat = new SimpleDateFormat(isoDatePattern);
}
private String readFechaActual(long timestamp){
return simpleDateFormat.format(new Date(timestamp));
}
}
getView中使用它： //set message content
holder.msg.setText(ChatBubble.getContent());
holder.dateTimeTx.setText("" + ChatBubble.getTimestamp()); // <--- ADD HERE
BubbleChat类并添加timestamp字段：public class ChatBubble {
private String content;
private boolean myMessage;
private long timestamp;
public ChatBubble(String content, boolean myMessage, long timestamp) {
this.content = content;
this.myMessage = myMessage;
this.timestamp = timestamp;
}
public String getContent() {
return content;
}
public boolean myMessage() {
return myMessage;
}
public long getTimestamp() {
return timestamp;
}
}
答案 1 :(得分：0)
您应该在using Prism.Navigation.TabbedPages;
async void SelectTab(object parameters)
{
var result = await _navigationService.SelectTabAsync("Tab3");
}
中设置时间，就像设置气泡消息一样。
您已经在getView中有了该字段。
此外，ViewHolder应该是ChatBubble ChatBubble = getItem(position);
请使用RecyclerView
答案 2 :(得分：0)
创建模型
public class TimeDifference {
int years;
int months;
int days;
int hours;
int minutes;
int seconds;
String differenceString;
public TimeDifference(Context mContext, Date curdate, Date olddate) {
String y = " "+mContext.getString(R.string.year);
String ys = " "+mContext.getString(R.string.years);
String m = " "+mContext.getString(R.string.month);
String ms = " "+mContext.getString(R.string.months);
String d = " "+mContext.getString(R.string.day);
String ds = " "+mContext.getString(R.string.days);
String h = " "+mContext.getString(R.string.hour);
String hs = " "+mContext.getString(R.string.hours);
String mm = " "+mContext.getString(R.string.minute);
String mms= " "+mContext.getString(R.string.minutes);
String s = " "+mContext.getString(R.string.second);
String ss = " "+mContext.getString(R.string.seconds);
String a = " "+mContext.getString(R.string.ago);
float diff=curdate.getTime() - olddate.getTime();
if (diff >= 0) {
int yearDiff = Math.round( ( diff/ (365l*2592000000f))>=1?( diff/ (365l*2592000000f)):0);
if (yearDiff > 0) {
years = yearDiff;
setDifferenceString(years + (years == 1 ? y : ys) + a);
} else {
int monthDiff = Math.round((diff / 2592000000f)>=1?(diff / 2592000000f):0);
if (monthDiff > 0) {
if (monthDiff > 11)
monthDiff = 11;
months = monthDiff;
setDifferenceString(months + (months == 1 ? m : ms) + a);
} else {
int dayDiff = Math.round((diff / (86400000f))>=1?(diff / (86400000f)):0);
if (dayDiff > 0) {
days = dayDiff;
if(days==30)
days=29;
setDifferenceString(days + (days == 1 ? d : ds) + a);
} else {
int hourDiff = Math.round((diff / (3600000f))>=1?(diff / (3600000f)):0);
if (hourDiff > 0) {
hours = hourDiff;
setDifferenceString( hours + (hours == 1 ? h : hs) + a);
} else {
int minuteDiff = Math.round((diff / (60000f))>=1?(diff / (60000f)):0);
if (minuteDiff > 0) {
minutes = minuteDiff;
setDifferenceString(minutes + (minutes == 1 ? mm : mms) + a);
} else {
int secondDiff =Math.round((diff / (1000f))>=1?(diff / (1000f)):0);
if (secondDiff > 0)
seconds = secondDiff;
else
seconds = 1;
setDifferenceString(seconds + (seconds == 1 ? s : ss) + a);
}
}
}
}
}
}
}
public String getDifferenceString() {
return differenceString;
}
public void setDifferenceString(String differenceString) {
this.differenceString = differenceString;
}
public int getYears() {
return years;
}
public void setYears(int years) {
this.years = years;
}
public int getMonths() {
return months;
}
public void setMonths(int months) {
this.months = months;
}
public int getDays() {
return days;
}
public void setDays(int days) {
this.days = days;
}
public int getHours() {
return hours;
}
public void setHours(int hours) {
this.hours = hours;
}
public int getMinutes() {
return minutes;
}
public void setMinutes(int minutes) {
this.minutes = minutes;
}
public int getSeconds() {
return seconds;
}
public void setSeconds(int seconds) {
this.seconds = seconds;
}
}
创建Utils.java并将其添加
public static Date getDefaultDate(){
SimpleDateFormat f = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
SimpleDateFormat dateFormatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
f.setTimeZone(TimeZone.getDefault());
Date nowDate = new Date();
try {
nowDate = dateFormatter.parse(f.format(new Date()));
}catch (ParseException e){
e.printStackTrace();
}
return nowDate;
}
public static Date newDate(String timeStamp){
Date OurDate = null;
try{
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
Date value = formatter.parse(timeStamp);
SimpleDateFormat dateFormatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
dateFormatter.setTimeZone(TimeZone.getDefault());
String n = dateFormatter.format(value);
OurDate = dateFormatter.parse(n);
}catch (ParseException e){
e.printStackTrace();
}
return OurDate;
}
将日期传递到适配器
TimeDifference now = new TimeDifference(mContext,Utils.getDefaultDate(),Utils.newDate("Your current time");
Toast.makeText(context, "Posted by "+now.getDifferenceString(), Toast.LENGTH_SHORT).show();