我正在尝试构建一个演示聊天App.I想要显示带有节标题的消息，如“今天”，“昨天”，“2015年5月21日”等日期。我已经成功实现了这一目标但是新的每当我滚动列表时都会调用View方法。标题和消息会混淆。
为简单起见，我已将标题保留在布局中，并在日期更改时更改其可见性（已消失且可见）。
你可以帮我解决这个问题吗？如果有人需要在问题中发布更多信息，请告诉我。public class ChatssAdapter extends CursorAdapter {
private Context mContext;
private LayoutInflater mInflater;
private Cursor mCursor;
private String mMyName, mMyColor, mMyImage, mMyPhone;
// private List<Contact> mContactsList;
private FragmentActivity mActivity;
private boolean mIsGroupChat;
public ChatssAdapter(Context context, Cursor c, boolean groupChat) {
super(context, c, false);
mContext = context;
mMyColor = Constants.getMyColor(context);
mMyName = Constants.getMyName(context);
mMyImage = Constants.getMyImageUrl(context);
mMyPhone = Constants.getMyPhone(context);
mIsGroupChat = groupChat;
mCursor = c;
// mActivity = fragmentActivity;
/*try {
mContactsList = PinchDb.getHelper(mContext).getContactDao().queryForAll();
} catch (SQLException e) {
e.printStackTrace();
}*/
}
@Override
public int getItemViewType(int position) {
Cursor cursor = (Cursor) getItem(position);
return getItemViewType(cursor);
}
private int getItemViewType(Cursor cursor) {
boolean type;
if (mIsGroupChat)
type = cursor.getString(cursor.getColumnIndex(Chat.COLMN_CHAT_USER)).compareTo(mMyPhone) == 0;
else type = cursor.getInt(cursor.getColumnIndex(Chat.COLMN_FROM_ME)) > 0;
if (type) {
return 0;
} else {
return 1;
}
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v = null;
int itemViewType = getItemViewType(cursor);
if (v == null) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (itemViewType == 0) {
v = mInflater.inflate(R.layout.row_chat_outgoing, parent, false);
} else {
v = mInflater.inflate(R.layout.row_chat_incoming, parent, false);
}
}
return v;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
ViewHolder holder = new ViewHolder();
View v = view;
final Chat chat = new Chat(cursor);
boolean fromMe = mIsGroupChat ? chat.getUser().compareTo(mMyPhone) == 0 : chat.isFrom_me();
if (fromMe) {
// LOGGED IN USER'S DATA SETTING....
holder.chat_name = (StyleableTextView) v
.findViewById(R.id.chat_user_name);
holder.chat_time = (StyleableTextView) v
.findViewById(R.id.chat_time);
holder.chat_tag = (StyleableTextView) v
.findViewById(R.id.chat_tag);
int color = Color.parseColor("#FFFFFF");
v.setBackgroundColor(color);
holder.chat_name.setText("#You");
holder.chat_time.setText(AppUtil.getEventTime(chat.getTimestampLong()));
// header text setting and process..
holder.chat_header_text = (TextView) v.findViewById(R.id.header_text);
String str_date = AppUtil.covertToDate(chat.getTimestampLong());
String pref_date = SharePreferencesUtil.getSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, "");
if (!str_date.equalsIgnoreCase(pref_date)) {
holder.chat_header_text.setVisibility(View.VISIBLE);
SharePreferencesUtil.putSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, str_date);
holder.chat_header_text.setText(str_date);
} else {
holder.chat_header_text.setVisibility(View.GONE);
}
String firstWord, theRest;
String mystring = chat.getText();
String arr[] = mystring.split(" ", 2);
if (arr.length > 1) {
firstWord = arr[0]; // the word with hash..
theRest = arr[1]; // rest of the body..
holder.chat_tag.setText(Html.fromHtml("<font color=\"#999999\"><b>" + firstWord + "</b></font>" + " " + "<font color=\"#000000\">" + theRest + "</font>"));
// holder.chat_text.setText(theRest);
// holder.chat_text.setClickable(false);
} else {
String msg = arr[0]; // the word with hash..
holder.chat_tag.setText(Html.fromHtml("<font color=\"#999999\"><b>" + msg + "</b></font>"));
//holder.chat_text.setText("");
}
updateTimeTextColorAsPerStatus(holder.chat_time, chat.getStatus());
v.setTag(holder);
} else {
// OTHER USER'S DATA SETTING....
holder.chat_name = (StyleableTextView) v
.findViewById(R.id.chat_user_name);
holder.chat_time = (StyleableTextView) v
.findViewById(R.id.chat_time);
holder.chat_tag = (StyleableTextView) v
.findViewById(R.id.chat_tag);
holder.chat_image = (ImageView) v
.findViewById(R.id.chat_profile_image);
String image = cursor.getString(cursor.getColumnIndex("image"));
String name = cursor.getString(cursor.getColumnIndex("name"));
String color = cursor.getString(cursor.getColumnIndex("color"));
// set the values...
if (holder.chat_image != null) {
MImageLoader.displayImage(context, image, holder.chat_image, R.drawable.round_user_place_holder);
}
int back_color = Color.parseColor("#FFFFFF");
v.setBackgroundColor(back_color);
holder.chat_name.setText(name);
holder.chat_time.setText(AppUtil.getEventTime(chat.getTimestampLong()));
// header text setting and process..
holder.chat_header_text = (TextView) v.findViewById(R.id.header_text);
String str_date = AppUtil.covertToDate(chat.getTimestampLong());
String pref_date = SharePreferencesUtil.getSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, "");
Log.d("eywa", "str date is ::::: " + str_date + " pref date is :::::: " + pref_date);
/*if (!TextUtils.isEmpty(pref_date)) {
if (!pref_date.contains(str_date)) {
holder.chat_header_text.setVisibility(View.VISIBLE);
SharePreferencesUtil.putSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, pref_date + str_date);
holder.chat_header_text.setText(str_date);
} else {
holder.chat_header_text.setVisibility(View.GONE);
}
} else {
holder.chat_header_text.setVisibility(View.VISIBLE);
SharePreferencesUtil.putSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, pref_date + str_date);
holder.chat_header_text.setText(str_date);
}*/
if (!str_date.equalsIgnoreCase(pref_date)) {
holder.chat_header_text.setVisibility(View.VISIBLE);
SharePreferencesUtil.putSharedPreferencesString(mContext, Constants.CHAT_TIMESTAMP, str_date);
holder.chat_header_text.setText(str_date);
} else {
holder.chat_header_text.setVisibility(View.GONE);
}
String firstWord, theRest;
String mystring = chat.getText();
String arr[] = mystring.split(" ", 2);
if (arr.length > 1) {
firstWord = arr[0]; // the word with hash..
theRest = arr[1]; // rest of the body..
holder.chat_tag.setText(Html.fromHtml("<font color=\"#999999\"><b>" + firstWord + "</b></font>" + " " + "<font color=\"#000000\">" + theRest + "</font>"));
// holder.chat_text.setClickable(false);
} else {
String msg = arr[0]; // the word with hash..
holder.chat_tag.setText(Html.fromHtml("<font color=\"#999999\"><b>" + msg + "</b></font>"));
// holder.chat_text.setText("");
}
String phone = cursor.getString(cursor.getColumnIndex("user"));
final Contact contact = new Contact(name, phone, "", color, image);
if (holder.chat_image != null) {
holder.chat_image.setTag(contact);
// holder.chat_name.setTag(contact);
holder.chat_image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Contact con = (Contact) v.getTag();
Intent intent = new Intent(mContext, OtherProfileActivity.class);
intent.putExtra(Constants.EXTRA_CONTACT, con);
mContext.startActivity(intent);
}
});
}
v.setTag(holder);
}
/*else
{
view=
}*/
}
private void updateTimeTextColorAsPerStatus(TextView chat_time, int status) {
if (status == 0) chat_time.setVisibility(View.INVISIBLE);
else {
chat_time.setVisibility(View.VISIBLE);
/* if (status == 1)
chat_time.setTextColor(mContext.getResources().getColor(android.R.color.white));*/
if (status == 2)
chat_time.setTextColor(mContext.getResources().getColor(android.R.color.darker_gray));
else if (status == 3)
chat_time.setTextColor(mContext.getResources().getColor(android.R.color.black));
}
}
@Override
public int getViewTypeCount() {
return 2;
}
public class ViewHolder {
public StyleableTextView chat_name;
public StyleableTextView chat_time;
public StyleableTextView chat_tag;
public ImageView chat_image;
public TextView chat_header_text;
}
@Override
public int getCount() {
if (getCursor() == null) {
return 0;
} else {
return getCursor().getCount();
}
}
}