One ViewModel or (Equivalent) per RecyclerView.ViewHolder
There are tons of tutorials on how to get a simple RecyclerView going, but now my ViewHolder logic becomes less and less simple.
Ideally I would have one instance of MyItemViewModel per ViewHolder, so I can separate UI related helpers. Is this at all possible?
I tried inflating and passing a binding like this:
(in RecyclerView.Adapter.onCreateViewHolder)
val binding = MyViewBinding.inflate(
LayoutInflater.from(parent.context), parent, false)
return MyViewHolder(binding)
But when I access binding.viewModel in MyViewHolder.setItem(item: Item) called via RecyclerView.Adapter.onBindViewHolder later, it is always null.
Any help? Can/should I instatiate one Fragment(Activity) per Item/ViewHolder so I can use ViewModelProviders? Is there sth similar to ViewModel that I should rather use?
android android-recyclerview kotlin android-lifecycle edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
add a comment |
There are tons of tutorials on how to get a simple RecyclerView going, but now my ViewHolder logic becomes less and less simple.
Ideally I would have one instance of MyItemViewModel per ViewHolder, so I can separate UI related helpers. Is this at all possible?
I tried inflating and passing a binding like this:
(in RecyclerView.Adapter.onCreateViewHolder)
val binding = MyViewBinding.inflate(
LayoutInflater.from(parent.context), parent, false)
return MyViewHolder(binding)
But when I access binding.viewModel in MyViewHolder.setItem(item: Item) called via RecyclerView.Adapter.onBindViewHolder later, it is always null.
Any help? Can/should I instatiate one Fragment(Activity) per Item/ViewHolder so I can use ViewModelProviders? Is there sth similar to ViewModel that I should rather use?
android android-recyclerview kotlin android-lifecycle edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
1
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08
add a comment |
There are tons of tutorials on how to get a simple RecyclerView going, but now my ViewHolder logic becomes less and less simple.
Ideally I would have one instance of MyItemViewModel per ViewHolder, so I can separate UI related helpers. Is this at all possible?
I tried inflating and passing a binding like this:
(in RecyclerView.Adapter.onCreateViewHolder)
val binding = MyViewBinding.inflate(
LayoutInflater.from(parent.context), parent, false)
return MyViewHolder(binding)
But when I access binding.viewModel in MyViewHolder.setItem(item: Item) called via RecyclerView.Adapter.onBindViewHolder later, it is always null.
Any help? Can/should I instatiate one Fragment(Activity) per Item/ViewHolder so I can use ViewModelProviders? Is there sth similar to ViewModel that I should rather use?
android android-recyclerview kotlin android-lifecycle edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
There are tons of tutorials on how to get a simple RecyclerView going, but now my ViewHolder logic becomes less and less simple.
Ideally I would have one instance of MyItemViewModel per ViewHolder, so I can separate UI related helpers. Is this at all possible?
I tried inflating and passing a binding like this:
(in RecyclerView.Adapter.onCreateViewHolder)
val binding = MyViewBinding.inflate(
LayoutInflater.from(parent.context), parent, false)
return MyViewHolder(binding)
But when I access binding.viewModel in MyViewHolder.setItem(item: Item) called via RecyclerView.Adapter.onBindViewHolder later, it is always null.
Any help? Can/should I instatiate one Fragment(Activity) per Item/ViewHolder so I can use ViewModelProviders? Is there sth similar to ViewModel that I should rather use?
android android-recyclerview kotlin android-lifecycle android android-recyclerview kotlin android-lifecycle edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
edited Nov 19 '18 at 9:08
Ümañg ßürmån
3,0883930
3,0883930
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
asked Nov 19 '18 at 9:07
JasperJasper
1,4771429
1,4771429
1
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08
add a comment |
1
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08
1
1
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08
add a comment |
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1
Its possible to create a RecyclerView with multiple ViewHolder . This might help you stackoverflow.com/questions/26245139/…
– Rohit Singh
Nov 19 '18 at 9:10
this might help android.jlelse.eu/…
– saiedmomen
Nov 19 '18 at 9:25
@RohitSingh thanks! It seems the trade-off of RecyclerView is the inability of declaring content in the view.
– Jasper
Nov 19 '18 at 9:29
I did not understand the trade-off ? What are you exactly suggesting? Was the suggested link helpful ?
– Rohit Singh
Nov 19 '18 at 11:54
Yes, very helpful! That's why I upvoted. I would still prefer to declare bindings in the view, not in the Adapter/ViewHolder, that is what I mean with trade-off: it seems you can not use declarative binding with RecyclerView.
– Jasper
Nov 19 '18 at 12:08