Develop Reference

How to create a horizontal list view or recycler view with fixed size by changing the width of its items

I'm beginner in Android Development and trying to create a display of items in such a way that the size of these varieties according to the quantity, as they have done in this app. Any suggestions?
Screenshot 1
Screenshot 2

LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager​.​HORIZONTAL​, false);
RecyclerView myList = (RecyclerView) findViewById​(​R​.​id​.​my_recycler_view​);
myList​.​setLayoutManager​(​layoutManager​);

So according to your question you have to add weight to the child elements which you can be given from parent layout like ex: recyclerview weight 3, and its item weight 1 each(if you have 3 items and fit in the width with margins on either sides) and consider to assign 3 to 6 elements in the width of the screen with horizontal scrolling
mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, true));
check here how to set weights for the views How to set layout_weight attribute dynamically from code?

scroll recyclerview item to top inside of scroll view

I'm trying to scroll recycler view item to top of screen when user clicks on an item.
My layout is set as following
- <FrameLayout>
-- <ScrollView>
--- <LinearLayout /> // static content
--- <RecyclerView /> // dynamic content
--- <LinearLayout /> // static content
-- </ScrollView>
-- </FrameLayout>
What I want to achieve is when i click on an item of recyclerview. It should scroll up to top of the screen.
I have tried following so far but no luck.
->
// use recycler view's layout manager to scroll.
recyclerView.layoutManager.scrollToPositionWithOffset(position)
->
// use smooth scroll to scroll
recyclerView.smoothScrollToPosition(ItemPos)
->
// use main scroll view to scroll on the screen. This kind of works but does not move item to top of the page.
val y = recyclerView.y + recyclerView.getChildAt(position).y
activity.binding.mainScrollview?.smoothScrollTo(0, y.toInt())
Any help is appreciated. Thank you

Looks like in your case you don't have enough items.
You can't get recyclerView scroll lower than the last Item So it's either you make your own implementation of recyclerView by extending it,get add scroll amounts and when got to the last item you'll add up the translationY of the recyclerView.
Or you can add a few dummy Items.So they can be View with width and height of your normal Items.That should do it.

Have you tried layoutManager's scrollToPositionWithOffset function:
thirdItem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
layoutManager.scrollToPositionWithOffset(0, 0);
}
});

scroll only next card view in Recyclerview even howmuch scroll amount applied

Scroll in Recyclerview list of card view default when scroll faster than scroll more than one card.I need only shows next of current card when scrolling even user how much scroll amount is applied in android.I Googled but not getting a solution. thanks for helping
my code contained MyRecyclerView and LinearLayoutManager looks following lines
MyRecyclerView = (RecyclerView) view.findViewById(R.id.cardView);
MyRecyclerView.setHasFixedSize(true);
LinearLayoutManager MyLayoutManager = new LinearLayoutManager(getActivity());
MyLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
if (listitems.size() > 0 & MyRecyclerView != null) {
MyRecyclerView.setAdapter(new MyAdapter(listitems));
}
MyRecyclerView.setLayoutManager(MyLayoutManager);

1. You should use smoothScrollToPosition(int position)
Starts a smooth scroll to an adapter position.
recyclerview.smoothScrollToPosition(position);
2. Use scrollToPosition()
void scrollToPosition (int position)
Convenience method to scroll to a certain position. RecyclerView does not implement scrolling logic, rather forwards the call to
RecyclerView.scrollToPosition(postion)
3. rv.getLayoutManager().scrollToPosition(youPositionInTheAdapter).
4. scrollToPositionWithOffset()
void scrollToPositionWithOffset (int position,int offset)
Scroll to the specified adapter position with the given offset from resolved layout start. Resolved layout start depends on getReverseLayout(), getLayoutDirection(android.view.View) and getStackFromEnd().
linearLayoutManager.scrollToPositionWithOffset(1, 10);

You can achieve this by using object of linearLayoutManager.Use this line to move the selected item to show on top of recycler screen.
linearLayoutManager.scrollToPositionWithOffset(YOUR_ITEM_POSITION,OFFSET_YOU_WANT);
For more information on how to use scrollToPositionWithOffset check this link .
https://developer.android.com/reference/android/support/v7/widget/LinearLayoutManager.html#scrollToPositionWithOffset(int,%20int)

Set Custom layout inside ListView as non-scrollable in android

I have a ListView which contains a custom layout.
Each row of the list View look like this:
The row contains 2 LinearLayouts, one for Date and one for Progress details. The progress Details Layout consits of 2 TextViews(Heading and data below it) and 1 Button (View More).
When the user clicks 'View More' button the data below the heading expands to 10-12 lines.
My problem is that when the TextView expands, a scrollbar comes at the edge and the user has to scroll to read. The width of the row does not change i.e the row does not expand.
I want the row width to expand so that the user does not have to scroll to read the text.
I did read a lot and have already tried the following options but they did not work
1. android:scrollbar="none"
2. View.setOverScrollMode(View.OVER_SCROLL_NEVER);
3. View.setScrollContainer(false);
Please help me with this.

You have to use exapanding listview animation for that you can use this lib for that
https://github.com/nhaarman/ListViewAnimations

Use a expandable List View such that the normal view of your list will have the image that you provided and on clicking that view it will expand to reveal the details that you wanted to show by clicking the view more option(in your image)
Here is a tut link for more info.

Try to use LayoutParams and change the height programatically inside the listener for you Button.
LayoutParams should derive from the type of layout containing your LinearLayout. If for instance it is a RelativeLayout, it will look something like that:
int heightForRow = 100;
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
params.height = heightForRow;
yourLinearLayout.setLayoutParams(params);
Please note that your LinearLayout must then be inside another layout (RelativeLayout in the example)

Scroll multiple horizontal RecyclerView together

I'm creating an EPG like view for which I have multiple horizontal RecyclerViews (as tv programs) encapsulated inside a LinearLayout. When I scroll one of the RecyclerView, I want the rest of the views to be scrolled together.
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
layoutContent.setWeightSum(epg.getChannels().size());
//prepare recycler views and add into layoutContent based on epg channels
for(EPG.Channel ch : epg.getChannels()){
AppLog.error(TAG, "Creating RecyclerView for: " + ch.getDisplayName());
//create new recycler view
final RecyclerView rv = new RecyclerView(layoutContent.getContext());
lstRecyclerViews.add(rv);
//set layout manager
rv.setLayoutManager(new LinearLayoutManager(layoutContent.getContext(), LinearLayoutManager.HORIZONTAL, false));
//create adapter
rv.setAdapter(new MyAdapter(ch.getPrograms()));
rv.setItemAnimator(new DefaultItemAnimator());
//add into parent layout
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
lp.weight = 1;
layoutContent.addView(rv, lp);
}
}
I've tried adding a scroll listener to my views but I'm confused with RecyclerView.OnScrollListener's onScrolled method as i can't figure out how to scroll other views.
Any help/suggestion would be helpful.

HorizontelScrollView
{
Linear Layout
{
Vertical list of horizontal recycler views ,
override horizontal recycler view's LayoutManager's
canScroolhorizontally() method to return false ,so that they
all scroll together according to the Grand Parent ScrollView.
}
Our main focus is to scroll that vertical list of horizontal recycler views horizontally ,
first i tried to keep all of them on a horizontal scroll view ,but that is something ,which the android system clearly rejects ,
so i kept one linear layout (in my case vertically oriented ) as a mediator.
so the epg grid now can scroll in vertically as they are inside one vertical recycler view as well as in horizontally because of the Horizontal scroll view.
and we should not allow horizontal list to scroll independentaly ,so I extended layoutmanager and disallow horizontal scrolling ,now they only scroll under grandParent scroll .

You need to always re-calculate position of current items in horizontal recycler views(next h.r.v.)
After scrolling in one h.r.v. re-calculate positions of others based on small amount of scroll movement occured in touched h.r.v.
Then override onViewAttachedToWindow in adapter and use method scrollToPositionWithOffset from LinearLayoutManager of particularly h.r.v to set it to right position.
Also when calculating movement dx, don't forget to disable onScrolled method when finger is down to avoid multiple handling of the same event.

FlexboxLayout (made by Google) lets you make something like this with a RecyclerView and a FlexboxLayoutManager. Since its version 3.0(June 28th 2017) you can drag horizontally through it.
For your example use it like this:
FlexboxLayoutManager layoutManager = new FlexboxLayoutManager(getActivity());
layoutManager.setFlexDirection(FlexDirection.ROW);
layoutManager.setFlexWrap(FlexWrap.WRAP);
recyclerView.setLayoutManager(layoutManager);
And don't forget to set the width of your RecyclerView to a bigger number than the screen size, in order to scroll, do not use match_parent:
<android.support.v7.widget.RecyclerView
android:layout_width="3600dp"
android:layout_height="match_parent"/>
Note: the ViewHolders are recycled by rows, not by columns, so be careful if you have too heavy items on a very long RecyclerView

You need to add textviews in horizontal rows. The length of the textview depends on the duration of the program. I have hosted a sample project on Github. Feel free to clone. https://github.com/xardox69/android_EPG