Mixing
Set DataSource size in PageKeyedDataSource to get placeholder effect
I am using the Paging Library from Android Architecture Component. I am trying to load data through server, without any local database.
My DataSource class extends PageKeyedDataSource.
Below is my Paging.Config customisation,
PagedList.Config pageConfig = (new PagedList.Config.Builder())
.setPageSize(20)
.setInitialLoadSizeHint(30)
.setPrefetchDistance(5)
.setEnablePlaceholders(true)
.build();
I have enabled placeholders & that lands me to managing null in
PagedListAdapter class. I have done that something like below,
@Override
public void onBindViewHolder(@NonNull MyEventViewHolder holder, int position) {
Article mArticle = getItem(position);
if (mArticle != null) {
holder.txtTitle.setText(mArticle.getTitle());
holder.txtAuthor.setText(mArticle.getAuthor());
holder.txtDesc.setText(mArticle.getDescription());
} else {
holder.txtTitle.setText("...");
holder.txtAuthor.setText("......");
holder.txtDesc.setText(".........");
}
}
I am unable to see placeholders at the end of a list before next API call.
My question is, Is there a way that I can specify the size of list after first API call? As my API is returning total number of items to be expected from the query. If not possible that what else I can do to see placeholders for my list.
Note : I cannot switch to ItemKeyedDataSource or PositionalDataSource because my API is set to respond on page basis.
android 
android-layout android-recyclerview 
android-jetpack android-paging asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
add a comment |
I am using the Paging Library from Android Architecture Component. I am trying to load data through server, without any local database.
My DataSource class extends PageKeyedDataSource.
Below is my Paging.Config customisation,
PagedList.Config pageConfig = (new PagedList.Config.Builder())
.setPageSize(20)
.setInitialLoadSizeHint(30)
.setPrefetchDistance(5)
.setEnablePlaceholders(true)
.build();
I have enabled placeholders & that lands me to managing null in
PagedListAdapter class. I have done that something like below,
@Override
public void onBindViewHolder(@NonNull MyEventViewHolder holder, int position) {
Article mArticle = getItem(position);
if (mArticle != null) {
holder.txtTitle.setText(mArticle.getTitle());
holder.txtAuthor.setText(mArticle.getAuthor());
holder.txtDesc.setText(mArticle.getDescription());
} else {
holder.txtTitle.setText("...");
holder.txtAuthor.setText("......");
holder.txtDesc.setText(".........");
}
}
I am unable to see placeholders at the end of a list before next API call.
My question is, Is there a way that I can specify the size of list after first API call? As my API is returning total number of items to be expected from the query. If not possible that what else I can do to see placeholders for my list.
Note : I cannot switch to ItemKeyedDataSource or PositionalDataSource because my API is set to respond on page basis.
android android-layout android-recyclerview android-jetpack android-paging asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
add a comment |
I am using the Paging Library from Android Architecture Component. I am trying to load data through server, without any local database.
My DataSource class extends PageKeyedDataSource.
Below is my Paging.Config customisation,
PagedList.Config pageConfig = (new PagedList.Config.Builder())
.setPageSize(20)
.setInitialLoadSizeHint(30)
.setPrefetchDistance(5)
.setEnablePlaceholders(true)
.build();
I have enabled placeholders & that lands me to managing null in
PagedListAdapter class. I have done that something like below,
@Override
public void onBindViewHolder(@NonNull MyEventViewHolder holder, int position) {
Article mArticle = getItem(position);
if (mArticle != null) {
holder.txtTitle.setText(mArticle.getTitle());
holder.txtAuthor.setText(mArticle.getAuthor());
holder.txtDesc.setText(mArticle.getDescription());
} else {
holder.txtTitle.setText("...");
holder.txtAuthor.setText("......");
holder.txtDesc.setText(".........");
}
}
I am unable to see placeholders at the end of a list before next API call.
My question is, Is there a way that I can specify the size of list after first API call? As my API is returning total number of items to be expected from the query. If not possible that what else I can do to see placeholders for my list.
Note : I cannot switch to ItemKeyedDataSource or PositionalDataSource because my API is set to respond on page basis.
android android-layout android-recyclerview android-jetpack android-paging asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
I am using the Paging Library from Android Architecture Component. I am trying to load data through server, without any local database.
My DataSource class extends PageKeyedDataSource.
Below is my Paging.Config customisation,
PagedList.Config pageConfig = (new PagedList.Config.Builder())
.setPageSize(20)
.setInitialLoadSizeHint(30)
.setPrefetchDistance(5)
.setEnablePlaceholders(true)
.build();
I have enabled placeholders & that lands me to managing null in
PagedListAdapter class. I have done that something like below,
@Override
public void onBindViewHolder(@NonNull MyEventViewHolder holder, int position) {
Article mArticle = getItem(position);
if (mArticle != null) {
holder.txtTitle.setText(mArticle.getTitle());
holder.txtAuthor.setText(mArticle.getAuthor());
holder.txtDesc.setText(mArticle.getDescription());
} else {
holder.txtTitle.setText("...");
holder.txtAuthor.setText("......");
holder.txtDesc.setText(".........");
}
}
I am unable to see placeholders at the end of a list before next API call.
My question is, Is there a way that I can specify the size of list after first API call? As my API is returning total number of items to be expected from the query. If not possible that what else I can do to see placeholders for my list.
Note : I cannot switch to ItemKeyedDataSource or PositionalDataSource because my API is set to respond on page basis.
android android-layout android-recyclerview android-jetpack android-paging android android-layout android-recyclerview android-jetpack android-paging asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
asked Jan 2 at 10:06
buzzingsilentlybuzzingsilently
865516
865516
add a comment |
add a comment |
1 Answer
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For this I think you need to do loadInitial inside
callback.onResult(mArticles, 0, SIZE_OF_TOTAL_ITEMS, null, 2L);
loadBefore
callback.onResult(mArticles, params.key - 1);
loadAfter
callback.onResult(mArticles, params.key + 1);
And there is SIZE_OF_TOTAL_ITEMS must be known at initial load time.
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
For this I think you need to do loadInitial inside
callback.onResult(mArticles, 0, SIZE_OF_TOTAL_ITEMS, null, 2L);
loadBefore
callback.onResult(mArticles, params.key - 1);
loadAfter
callback.onResult(mArticles, params.key + 1);
And there is SIZE_OF_TOTAL_ITEMS must be known at initial load time.
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
add a comment |
For this I think you need to do loadInitial inside
callback.onResult(mArticles, 0, SIZE_OF_TOTAL_ITEMS, null, 2L);
loadBefore
callback.onResult(mArticles, params.key - 1);
loadAfter
callback.onResult(mArticles, params.key + 1);
And there is SIZE_OF_TOTAL_ITEMS must be known at initial load time.
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
add a comment |
For this I think you need to do loadInitial inside
callback.onResult(mArticles, 0, SIZE_OF_TOTAL_ITEMS, null, 2L);
loadBefore
callback.onResult(mArticles, params.key - 1);
loadAfter
callback.onResult(mArticles, params.key + 1);
And there is SIZE_OF_TOTAL_ITEMS must be known at initial load time.
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
For this I think you need to do loadInitial inside
callback.onResult(mArticles, 0, SIZE_OF_TOTAL_ITEMS, null, 2L);
loadBefore
callback.onResult(mArticles, params.key - 1);
loadAfter
callback.onResult(mArticles, params.key + 1);
And there is SIZE_OF_TOTAL_ITEMS must be known at initial load time.
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
answered Jan 2 at 12:42
Sameer JaniSameer Jani
696210
696210
add a comment |
add a comment |
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