Equal column spacing for android recyclerview gridlayoutmanager

In your source code, add ItemOffsetDecoration to your recyclerview. Item offset value should be half size of the actual value you want to add as space between items. Thanks, I need some help on other problem. I want to make items equally spaced in a RecyclerView.

Asymmetrical grid layout using RecyclerView

Items are not displayed in Grid but are displayed Linearly. Suppose screen can hold 5 items. Now if list contains less than 5 items then they should take up the whole screen by equally increasing space between them. And if no of items are greater than 5 then user can scroll and the minimum space is maintained between 2 items. How can I achieve this. It is working fine but I am calling new Activity from the recyclerview and when I am coming back to my previous activity the space automatically becomes 2 times every time.

Any solution for that? Thank you very much! I used 4dp! This worked like a charm! God bless u! Perfect solution We might be able to customize it then according to our needs. Thanks a million! Skip to content.

Instantly share code, notes, and snippets. Code Revisions 2 Stars Forks Posted by: admin November 18, Leave a comment. RecyclerViews support the concept of ItemDecoration : special offsets and drawing around each element.

As seen in this answeryou can use. The following is the step-by-step simple solution if you want the equal spacing around items and equal item sizes. Item offset value should be half size of the actual value you want to add as space between items. Try this. Works both with List, Grid, and StaggeredGrid. The updated code should handle most of the corner cases with spans, orientation, etc. It should be the problem about IndexOfSpan. There is a very simple and yet flexible solution for this problem using only XML which works on every LayoutManager.

In the code below I set a 4dp space between every item 2dp around every single item and 2dp padding around the whole recyclerview. You can do like this. There is only one easy solution, that you can remember and implement wherever needed.

No bugs, no crazy calculations. Tags: androidlayoutview. February 20, Android Leave a comment. Questions: I want to intent to another fragment but I got an error java. ClassCastException: android.

GridLayoutManager.SpanSizeLookup

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Save my name, email, and website in this browser for the next time I comment. Add menu. Following code works well, and each column has same width: public class GridSpacingItemDecoration extends RecyclerView. Edited The updated code should handle most of the corner cases with spans, orientation, etc. It is better to move this constant to static constant on top, but we need context to convert it to dp, so can't really do so.SpanSizeLookup extends Object.

A helper class to provide the number of spans each item occupies. Default implementation sets each item to occupy exactly 1 span. Returns the number of span occupied by the item at position. Returns whether results of getSpanGroupIndex int, int method are cached or not. Returns whether results of getSpanIndex int, int method are cached or not. Sets whether the results of getSpanGroupIndex int, int method should be cached or not. Sets whether the results of getSpanIndex int, int method should be cached or not.

Returns the index of the group this position belongs. For example, if grid has 3 columns and each item occupies 1 span, span group index for item 1 will be 0, item 5 will be 1.

Returns the final span index of the provided position. If you have a faster way to calculate span index for your items, you should override this method. Otherwise, you should enable span index cache setSpanIndexCacheEnabled boolean for better performance. When caching is disabled, default implementation traverses all items from 0 to position. When caching is enabled, it calculates from the closest cached value before the position. If you override this method, you need to make sure it is consistent with getSpanSize int.

GridLayoutManager does not call this method for each item. It is called only for the reference item and rest of the items are assigned to spans based on the reference item.

GridLayoutManager.SpanSizeLookup

For example, you cannot assign a position to span 2 while span 1 is empty. Note that span offsets always start with 0 and are not affected by RTL. Clears the span group index cache. GridLayoutManager automatically calls this method when adapter changes occur. Clears the span index cache. By default these values are not cached. If you are not overriding getSpanGroupIndex int, int with something highly performant, and you are using spans to calculate scrollbar offset and range, you should set this to true for better performance.

If you are not overriding getSpanIndex int, int with something highly performant, you should set this to true for better performance.

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Content and code samples on this page are subject to the licenses described in the Content License. The second Android 11 Developer Preview is now available, test it out and share your feedback. Android Developers. Summary: Ctors Methods Inherited Methods. SpanSizeLookup Kotlin Java. Known direct subclasses GridLayoutManager. See also: GridLayoutManager. From class java. Default implementation for GridLayoutManager.SpanSizeLookup extends Object. A helper class to provide the number of spans each item occupies.

Default implementation sets each item to occupy exactly 1 span. Returns the number of span occupied by the item at position. Returns whether results of getSpanIndex int, int method are cached or not. Sets whether the results of getSpanIndex int, int method should be cached or not.

Returns the index of the group this position belongs.

67 Advanced Grid Layout -

For example, if grid has 3 columns and each item occupies 1 span, span group index for item 1 will be 0, item 5 will be 1. Returns the final span index of the provided position. If you have a faster way to calculate span index for your items, you should override this method. Otherwise, you should enable span index cache setSpanIndexCacheEnabled boolean for better performance. When caching is disabled, default implementation traverses all items from 0 to position.

When caching is enabled, it calculates from the closest cached value before the position. If you override this method, you need to make sure it is consistent with getSpanSize int. GridLayoutManager does not call this method for each item. It is called only for the reference item and rest of the items are assigned to spans based on the reference item. For example, you cannot assign a position to span 2 while span 1 is empty.

Note that span offsets always start with 0 and are not affected by RTL. Clears the span index cache.

equal column spacing for android recyclerview gridlayoutmanager

GridLayoutManager automatically calls this method when adapter changes occur. By default these values are not cached. If you are not overriding getSpanIndex int, intyou should set this to true for better performance.

Content and code samples on this page are subject to the licenses described in the Content License. The second Android 11 Developer Preview is now available, test it out and share your feedback.

Android Developers. SpanSizeLookup added in version Annotations RecyclerView. EdgeDirection RecyclerView. OnDismissListener PopupMenu. LayoutPrefetchRegistry RecyclerView. RecyclerListener RecyclerView. ScrollVectorProvider SearchView.

OnCloseListener SearchView. Alignment GridLayout. LayoutParams GridLayout. LayoutParams GridLayoutManager. Adapter RecyclerView.LayoutParams extends RecyclerView.

LayoutParams used by GridLayoutManager. Note that if the orientation is LinearLayoutManager. Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to in the RecyclerView. Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to with respect to the RecyclerView. Adapter that bound this View. This method is deprecated. This method is confusing when nested adapters are used.

If you are calling from the context of an RecyclerView. Adapteruse getBindingAdapterPosition. Returns the adapter position that the view this LayoutParams is attached to corresponds to as of latest layout calculation. Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been changed in the data set.

Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been removed from the data set. Returns true if the view this LayoutParams is attached to is now representing potentially invalid data. Returns true if the view this LayoutParams is attached to needs to have its content updated from the corresponding adapter. LayoutParams public GridLayoutManager.

LayoutParams Context c, AttributeSet attrs. Returns the current span index of this View. If the View is not laid out yet, the return value is undefined. Starting with RecyclerView Prior to If the View occupies multiple spans, span with the minimum index is returned.

Returns the number of spans occupied by this View. If the View not laid out yet, the return value is undefined. Content and code samples on this page are subject to the licenses described in the Content License.

The second Android 11 Developer Preview is now available, test it out and share your feedback. Android Developers.

LayoutParams Kotlin Java. From class android. LayoutParams public int height public LayoutAnimationController. AnimationParameters layoutAnimationParameters public int width. From class androidx. From class java.

equal column spacing for android recyclerview gridlayoutmanager

LayoutParams int. MarginLayoutParams public int. LayoutParams public int. LayoutParams int width, int height. LayoutParams ViewGroup. MarginLayoutParams source. LayoutParams source.Back at Twitter, I worked with the search team to introduce image results in the Android app.

The designer came up with a wonderful layout that at that time, was challenging, but we managed to launch it. During that time, there was no RecyclerView, no abstract layout managers that can be extended to easily build an asymmetrical grid view. Today, however, the Android ecosystem has a lot of abstractions that can be leveraged to build a similar gallery. In fact, it can be just built with the basic features available in the RecyclerView library and as before some math to handle the edge cases.

The source code for the standard grid gallery can be found here. Just to recap, the adapter is simply going to show the image and the accompanied title. Starting with the standard grid layout, we need some small changes to allow support for items that span different column width. GridLayoutManager allows the user to provide a lookup callback to get the column widths for different positions.

For example, to use double width for all items in even position we can use the following code:. We can extend this to build a more asymmetrical columns, by essentially performing a similar calculation to the weight distribution in LinearLayout. To ensure that the image calculations only happen once we can save the column width in the model objects.

Since we are working to build an asymmetrical look, we need to find a grid that allows for that flexibility. In our case we are going to use a 15 column grid. Next these 15 columns will be distributed among the row items based on the image aspect ratio. Now that we have our column calculations, we can update maxColumns to be 15, and update the span lookup to read from the item. Fully working example mimicking the original Twitter gallery is available in this public repository.

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RecyclerViews support the concept of ItemDecoration : special offsets and drawing around each element. As seen in this answeryou can use. The following is the step-by-step simple solution if you want the equal spacing around items and equal item sizes. Item offset value should be half size of the actual value you want to add as space between items. Try this.

equal column spacing for android recyclerview gridlayoutmanager

It'll take care of equal spacing all around. Works both with List, Grid, and StaggeredGrid. The updated code should handle most of the corner cases with spans, orientation, etc.

Note, it seems that with StaggeredGrid, there's seems to be a bug where the index of the children gets wacky and hard to track so the code below might not work very well with StaggeredGridLayoutManager.

Here is a solution that doesn't require "spanCount" number of columns I use it because I use GridAutofitLayoutManager calculates the number of columns according to the required cell size. There is only one easy solution, that you can remember and implement wherever needed.

No bugs, no crazy calculations. You can do like this. It should be the problem about IndexOfSpan. The selected answer is almost perfect, but depending on the space, items width can be not equal.

equal column spacing for android recyclerview gridlayoutmanager

In my case it was critical. So i've ended up with this code which increases space a little bit, so items are all the same width. There is a very simple and yet flexible solution for this problem using only XML which works on every LayoutManager. Here is my modification of SpacesItemDecoration which can take numOfColums and space equally on top, bottom, left and right. My solution is to override deprecated ItemDecoration's method:.

I was using Kotlin however so here is the equivalent of that. In the code below I set a 4dp space between every item 2dp around every single item and 2dp padding around the whole recyclerview.


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