LoopBar Infinite Scrolling for Android

Navigation part is also a important role for user point of view and now a days navigation panel is pretty boring and trivial. Thats why i introduce you our new component named LoopBar in which idea was to make the navigation menu right at fingerprints, in a tab bar. What's more the view has a few specific features that make it stand out from the crowd of similar ones. So, try out the LoopBar library in your app and you’ll see the difference.

Previous article : Add Material Intro Screen in Android
Customers comfort should be priority that is why they provided the ability to place the bar either horizontally or vertically. Thus, it is possible to not only customize the application look but also choose the most efficient user experience.
Cool library : Use Facebook emoji like button in Android


by gradle :
dependencies {
    compile "com.cleveroad:loopbar:1.1.3"
or just download source code given below and import module "LoopBar-widget" to be able to modify the sources


View consist from two parts:
  • A list of your selectable groups
  • Selected view
View can work in three scroll modes: infinite, finite and auto mode. Names of first two speak for itself. In auto mode the list of groups will be infinite if all adapter items didn't fit on screen in other case it will be a static list. Selected view by request could overlay layout on screen on which it placed. Widget has horizontal and vertical layouts and also start or end gravity of selected view.
Compile Android app fast : JRebel for Android

You are allowed to use any RecyclerView adapter, which you want. Concrete infinite scroll logic is fully encapsulated.
Android Studio layouts preview is supported.


android:id="@+id/endlessView" android:layout_width="match_parent" android:layout_height="wrap_content" app:enls_placeholderId="@id/placeHolder" app:enls_orientation="horizontal" app:enls_selectionGravity="start" app:enls_selectionMargin="10dp" app:enls_overlaySize="5dp" app:enls_selectionInAnimation="@animator/enls_scale_restore" app:enls_selectionOutAnimation="@animator/enls_scale_small" app:enls_selectionBackground="@android:color/holo_blue_dark" app:enls_menu="@menu/loopbar" app:enls_scrollMode="auto" />
enls_overlaySize & enls_placeholderId are used for overlay feature. Placeholder must be the view lying under the LoopBar. And it's used for setting bounds In layout when selected view has overlay. LoopBar will set width or height for this view by itself (depending of LoopBar orientation), it will be the same as LoopBar has.
Without this placeholder the bounds of LoopBar will be limited by selected view (with overlay). And thanks to placeholder the bounds will be limited only by list of groups. You can see an example of overlay usage in sample.
attribute namedescription
enls_overlaySizea size of selected view overlaying
enls_placeholderIdan id of view on which you should use layout:above or other attributes of RelativeLayouts, because LoopBarView will have increased height in this case. See more in sample
enls_selectionGravitya gravity of selection view. Can be vertical or horizontal. Default horizontal
enls_selectionMargina margin of selectionView from bounds of view. Default 5dp
enls_selectionInAnimationan animation of appearing an icon inside selection view
enls_selectionOutAnimationan animation of hiding an icon inside selection view
enls_selectionBackgroundselection background. Default #ff0099cc
enls_menuan id of menu which will be used for getting title and icon items
enls_scrollModeScrolling mode. Can be infinitefiniteauto. Default infinite
android:backgroundView have yellow background by default. Use standart android:background attribute to change it. Default #ffc829
To initialize items in widget and work with it you should setup adapter to it and add item click mListener:
LoopBarView loopBarView = findViewById(...);
categoriesAdapter = new SimpleCategoriesAdapter(MockedItemsFactory.getCategoryItems(getContext()));
Here SimpleCategoriesAdapter is used which required collection of ICategoryItem objects (to draw default view with icon and text).
Also you can setup adapter through:


Java code (see example MenuLoopBarFragment):

//or Menu menu = ...; loopBarView.setCategoriesAdapterFromMenu(menu);

or via XML:

... app:enls_menu="@menu/loopbar" />


Just set a viewPager into your LoopBar. If you want to show category icons, your ViewPager adapter must implement ILoopBarPagerAdapter interface (see example ViewPagerLoopBarFragment), otherwise the icons will not be shown:

To customize wrapped RecyclerView (control animations, decorators or add RecyclerView.OnScrollListener) you are able to use following methods:
method namedescription
setItemAnimator(RecyclerView.ItemAnimator animator)Sets the ItemAnimator to wrapped RecyclerView
isAnimating()Returns true if wrapped RecyclerView is currently running some animations
addItemDecoration(RecyclerView.ItemDecoration decor)Add an ItemDecoration to wrapped RecyclerView
addItemDecoration(RecyclerView.ItemDecoration decor, int index)Add an ItemDecoration to wrapped RecyclerView
removeItemDecoration(RecyclerView.ItemDecoration decor)Remove an ItemDecoration from wrapped RecyclerView
invalidateItemDecorations()Invalidates all ItemDecorations in wrapped RecyclerView
addOnScrollListener(RecyclerView.OnScrollListener listener)Add a OnScrollListener to wrapped RecyclerView
removeOnScrollListener(RecyclerView.OnScrollListener listener)Remove a OnScrollListener from wrapped RecyclerView
clearOnScrollListeners()Remove all secondary OnScrollListener from wrapped RecyclerView

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