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Android Paging Library: how to show related item if it's not in local database yet and don't break paging?

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0

I'm writing chat app. Messages are load by pages (item keyed - message_id) using Android Paging Library. Also there is "reply" feature, which mean users can reply to any message in chat. In RecyclerView it should looks like that:

Part of message which was replied...
------------------------------------
Main message text

It is simple, when related message is already in local database. I can fetch all data from database and show it in app. But there can be situations when replied message is NOT in local database (for example, this is old message and we just installed app - database is empty). And message looks bad, until replied message won't be stored in local database:

------------------------------------
Main message text

What I've tried: if message's property reply_to is not null I load replied message from remote server by this id and store it in local database. Room react to changes and display all content fine. But this replied message become last in my messages array and BoundaryCallback load messages after that replied message skipping messages between REAL last message and that replied message.

For example, I have messages with ids 1..100.

(boundary callback makes initialLoad, say 20 items)
1 message
2 message
..
10 message with reply to 50 message (load message 50 and store it in db)
11 message
..
(early loaded messages)
..
20 message
(this should be end, but this is not because of 50 message which is stored in local database now)
50 message
(bounary callback makes loadAfter new items by key - message id)
51 message
..

So, we lost part of messages from 21 to 49.

Message room entity has following properties:

@Entity
class Message 
 var id: Int
 var text: String
 var reply_to: Int?

MessageModel is returned by Room by relation and used in PagedAdapter

class MessageModel 
 var message: Message
 var repliedMessage: Message

How can I show replied message and don't break paging?
How it should be done in right way?

android kotlin android-room android-paging

share|improve this question

edited Mar 27 at 3:51

LIFED

asked Mar 26 at 10:30

LIFEDLIFED

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add a comment | 

0

I'm writing chat app. Messages are load by pages (item keyed - message_id) using Android Paging Library. Also there is "reply" feature, which mean users can reply to any message in chat. In RecyclerView it should looks like that:

Part of message which was replied...
------------------------------------
Main message text

It is simple, when related message is already in local database. I can fetch all data from database and show it in app. But there can be situations when replied message is NOT in local database (for example, this is old message and we just installed app - database is empty). And message looks bad, until replied message won't be stored in local database:

------------------------------------
Main message text

What I've tried: if message's property reply_to is not null I load replied message from remote server by this id and store it in local database. Room react to changes and display all content fine. But this replied message become last in my messages array and BoundaryCallback load messages after that replied message skipping messages between REAL last message and that replied message.

For example, I have messages with ids 1..100.

(boundary callback makes initialLoad, say 20 items)
1 message
2 message
..
10 message with reply to 50 message (load message 50 and store it in db)
11 message
..
(early loaded messages)
..
20 message
(this should be end, but this is not because of 50 message which is stored in local database now)
50 message
(bounary callback makes loadAfter new items by key - message id)
51 message
..

So, we lost part of messages from 21 to 49.

Message room entity has following properties:

@Entity
class Message 
 var id: Int
 var text: String
 var reply_to: Int?

MessageModel is returned by Room by relation and used in PagedAdapter

class MessageModel 
 var message: Message
 var repliedMessage: Message

How can I show replied message and don't break paging?
How it should be done in right way?

android kotlin android-room android-paging

share|improve this question

edited Mar 27 at 3:51

LIFED

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

add a comment | 

I'm writing chat app. Messages are load by pages (item keyed - message_id) using Android Paging Library. Also there is "reply" feature, which mean users can reply to any message in chat. In RecyclerView it should looks like that:

Part of message which was replied...
------------------------------------
Main message text

It is simple, when related message is already in local database. I can fetch all data from database and show it in app. But there can be situations when replied message is NOT in local database (for example, this is old message and we just installed app - database is empty). And message looks bad, until replied message won't be stored in local database:

------------------------------------
Main message text

What I've tried: if message's property reply_to is not null I load replied message from remote server by this id and store it in local database. Room react to changes and display all content fine. But this replied message become last in my messages array and BoundaryCallback load messages after that replied message skipping messages between REAL last message and that replied message.

For example, I have messages with ids 1..100.

(boundary callback makes initialLoad, say 20 items)
1 message
2 message
..
10 message with reply to 50 message (load message 50 and store it in db)
11 message
..
(early loaded messages)
..
20 message
(this should be end, but this is not because of 50 message which is stored in local database now)
50 message
(bounary callback makes loadAfter new items by key - message id)
51 message
..

So, we lost part of messages from 21 to 49.

Message room entity has following properties:

@Entity
class Message 
 var id: Int
 var text: String
 var reply_to: Int?

MessageModel is returned by Room by relation and used in PagedAdapter

class MessageModel 
 var message: Message
 var repliedMessage: Message

How can I show replied message and don't break paging?
How it should be done in right way?

android kotlin android-room android-paging

share|improve this question

edited Mar 27 at 3:51

LIFED

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

Part of message which was replied...
------------------------------------
Main message text

------------------------------------
Main message text

(boundary callback makes initialLoad, say 20 items)
1 message
2 message
..
10 message with reply to 50 message (load message 50 and store it in db)
11 message
..
(early loaded messages)
..
20 message
(this should be end, but this is not because of 50 message which is stored in local database now)
50 message
(bounary callback makes loadAfter new items by key - message id)
51 message
..

@Entity
class Message 
 var id: Int
 var text: String
 var reply_to: Int?

class MessageModel 
 var message: Message
 var repliedMessage: Message

android kotlin android-room android-paging

android kotlin android-room android-paging

share|improve this question

edited Mar 27 at 3:51

LIFED

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

share|improve this question

edited Mar 27 at 3:51

LIFED

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

asked Mar 26 at 10:30

LIFEDLIFED

10911 silver badge1010 bronze badges

1 Answer
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1

I found a solution. In my case I have created additional table RepliedMessage (which is an absolute copy of Message) and I store replied messages in that table. Pagination works perfectly. We only need to keep RepliedMessages up to date.

share|improve this answer

answered Mar 29 at 5:22

LIFEDLIFED

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1

I found a solution. In my case I have created additional table RepliedMessage (which is an absolute copy of Message) and I store replied messages in that table. Pagination works perfectly. We only need to keep RepliedMessages up to date.

share|improve this answer

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges

add a comment | 

1

I found a solution. In my case I have created additional table RepliedMessage (which is an absolute copy of Message) and I store replied messages in that table. Pagination works perfectly. We only need to keep RepliedMessages up to date.

share|improve this answer

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges

add a comment | 

I found a solution. In my case I have created additional table RepliedMessage (which is an absolute copy of Message) and I store replied messages in that table. Pagination works perfectly. We only need to keep RepliedMessages up to date.

share|improve this answer

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges

share|improve this answer

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges

answered Mar 29 at 5:22

LIFEDLIFED

10911 silver badge1010 bronze badges