Support for 'RecyclerView'

[ApmeM]

Add support for RecyclerView LayoutManager.

[douglasjunior]

Continuing the discussion of #39.

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The RecyclerView is a component created to replace the "ListView" and "GridLayout". It works with Adapters and also LayoutManagers.

The Adapters is designed to provide the data source, as well as in the ListView.

The LayoutManagers are responsible for organizing the items on the screen. Standards implementations are: LinearLayoutManager, GridLayoutManager, and StaggeredGridLayoutManager.

See examples here: https://guides.codepath.com/android/Using-the-RecyclerView

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One problem that has been found to apply the function "FlowLayout", ie making the number of columns is dynamic, according to the screen size.

To solve, I applied this workaround: http://stackoverflow.com/questions/26666143/recyclerview-gridlayoutmanager-how-to-auto-detect-span-count

Then I had the idea of ​​creating a "FlowLayoutManager", so you can use the RecyclerView and all the advantages it provides. So I asked you if you had plans, because I believe that you can leverage the knowledge applied to FlowLayout.

This would also solve the question #14.

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If I can help with anything else, I have little free time, but I am available.

[ApmeM]

Hi,

You may try to use recycler view now.
The example is available in FlowLayoutManagerActivity.
Because of code restrucutization there can be some breaking changes (not sure what exactly can be broken, but if you were using layout parameters values - they are no longer available)

It is still not using all power of recycler view like scrolling or actual view recycling, but all original FlowLayuot functionality is there.

Thanks.

[douglasjunior]

Yes, I did tests with RecyclerView and it worked great!

The next step really is scrolling and recycling of views.

For example, I have cases in my list has 48 items, but only 2 are displayed at a time. When this runs notifyDataChanged it needs to update the 48 items. It is very slow.

Thanks for your time, it's getting very good, I believe that with that the library will cover a lot of users!

[dadino]

Even with view recycling notifyDataSetChanged() will redraw all 48 items. You should use notifyItemChanged(int position) or similar to update just the needed views.

[douglasjunior]

In FlowLayoutManager it makes no difference, it will always be updated every item.

In my case, using the FlowLayoutManager is used 40% of CPU to notifyDatasetChanged. Using GridLayoutManager only 10%.

For the GidLayoutManager updates only the items that appear on the screen.

[niqo01]

@ApmeM just tried master FlowLayoutManager and I am getting:

java.lang.IllegalArgumentException: Called attach on a child which is not detached: ViewHolder{10f1f7e9 position=0 id=0, oldPos=-1, pLpos:-1 no parent}
at android.support.v7.widget.RecyclerView$4.attachViewToParent(RecyclerView.java:587)
at android.support.v7.widget.ChildHelper.attachViewToParent(ChildHelper.java:239)
at android.support.v7.widget.RecyclerView$LayoutManager.attachView(RecyclerView.java:6492)
at android.support.v7.widget.RecyclerView$LayoutManager.attachView(RecyclerView.java:6507)
at android.support.v7.widget.RecyclerView$LayoutManager.attachView(RecyclerView.java:6518)
at org.apmem.tools.layouts.FlowLayoutManager.onLayoutChildren(FlowLayoutManager.java:63)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2847)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3145)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1043)
...

[niqo01]

Rolling back to commit 922fcc9e821d838f219c4a5fe5c11bfa0ce70313 fixes the issue

[niqo01]

Also I am having an issue where all the cells width are correct but for two of them, half of the text is not visible due to the text being moved to a new line (Cell 3 and 4 on the screenshot). The cell width look correct though.

[eshkoliGilad]

Any updates on FlowLayoutManager ?

When I use notifyDataSetChanges() or notifyItemChanged() is scrolled back to the top.

@ApmeM

[douglasjunior]

@eshkoliGilad Please, create a new issue for a new question.

Tip: dont mention a user in your question to get attention.

[eshkoliGilad]

This is somewhat related to the issue.

onLayoutChildren is called again when updating the data set and I can't for my life seem to be able to get recycling to work with scroll like in other LayoutManagers.

Any solution for this issue ?

@douglasjunior

Edited: Why not mention user if what I'm writing is referring to him ?

[pzhangleo]

@niqo01 hi, do you find reason for problem with cell3 and cell4?
I find same problem too.

[icodeyou]

@eshkoliGilad hi. Have you fixed this issue ?