RecyclerView with 3 by 3 item Horizontal scroll

Question

In my project, I need to show the list of item in 3 by 3 on the horizontal scroll view with left and right arrow. If I click on the right arrow next 3 item should display like below image

I am confused that I need to go with ViewPager or RecyclerView with SnapHelper or PagerSnapHelper. Is there any other suggestions on how I can achieve it

Answer 1

For answer this qustion you should use viewpager and in any page use recycler and sending data 3 by 3 in page and set data to recycler.

1. The first Step you should add Viewpager in parent xml :
   
   activity_main.xml

    <ImageView android:id="@+id/left_arrow" android:layout_width="wrap_content" android:layout_alignParentLeft="true" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_alignTop="@+id/view_pager" android:rotation="180" android:padding="8dp" android:layout_alignBottom="@id/view_pager" android:src="@drawable/ic_arrow"/> <android.support.v4.view.ViewPager android:layout_width="match_parent" android:id="@+id/view_pager" android:layout_toLeftOf="@id/right_arrow" android:layout_toRightOf="@id/left_arrow" android:layout_height="150dp"/> <com.rd.PageIndicatorView android:id="@+id/pageIndicatorView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/view_pager" app:piv_animationType="worm" app:piv_dynamicCount="true" android:layout_marginTop="10dp" android:layout_centerHorizontal="true" app:piv_interactiveAnimation="true" app:piv_radius="3dp" app:piv_unselectedColor="#999999" app:piv_selectedColor="#000000" app:piv_viewPager="@id/view_pager" attrs:piv_padding="8dp" /> <ImageView android:id="@+id/right_arrow" android:padding="8dp" android:layout_alignTop="@+id/view_pager" android:layout_alignBottom="@id/view_pager" android:layout_alignParentRight="true" android:layout_width="wrap_content" android:layout_centerVertical="true" android:layout_height="wrap_content" android:src="@drawable/ic_arrow"/> 

2. In this step you should create Viewpager adapter :
   
   pageAdapter.kt

    override fun getItem(position: Int): Fragment { val firstItem = ((position + 1) * 3) - 2 val lastItem = ((position + 1) * 3) val itemSet = arrayListOf<String>() for (i in firstItem..lastItem) { if (i <= items.size) itemSet.add(items[i - 1]) } return ItemFragment.newInstance(itemSet) } override fun getCount(): Int { return size } 

3. In the third step, you should create a fragment to show each page of viewPager and just in Oncreate set recycler adapter and send data to adapter :
   
   ItemFragment

    // Creates the view controlled by the fragment val view = inflater.inflate(R.layout.page, container, false) val recycler = view.findViewById<RecyclerView>(R.id.recycler) // Retrieve and display the movie data from the Bundle val args = arguments recycler.layoutManager = GridLayoutManager(activity,3) recycler.adapter = ItemAdapter(args?.getStringArrayList("items")!!, this.activity!!) 

4. And The Last Just create RecyclerAdapter and show data to each item in list:
   
   ItemAdapter.kt

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder { return ViewHolder(LayoutInflater.from(context).inflate(R.layout.item, parent, false)) } override fun onBindViewHolder(holder: ViewHolder, position: Int) { holder?.title?.text = items.get(position) } override fun getItemCount(): Int { return items.size } 

   Result :
   
   

if you want to see the full source, just go to this link

Answer 2

What about scroll through smoothScrollToPosition? Something like this

int offset = 3;
int size = objectsList.size()-1;
@OnClick{
recyclerView.smoothScrollToPosition(offset);
if((offset+3)<size) {
   offset = offset + 3;
} else 
    offset = size;
}