Android Paging RecylerView as ViewPager (Horizontal Swipe of Fragment Pages)
May 4, 2019Setup
- Set RecyclerView to horizontal scrolling
- Use
PagerSnapHelper
to make sure each page/fragment is shown fully (no partial scroll) - Use CirclePagerIndicatorDecoration to display current page indicator
- Use LayoutContainer to enable Kotlin Android Extensions ViewBinding for ViewHolder in RecyclerView
class TestPagerActivity : AppCompatActivity() {
private lateinit var adapter: LocalAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// optional: hide title/actionbar
supportActionBar?.hide()
setContentView(R.layout.testpager)
initUi()
}
private fun initUi() {
adapter = LocalAdapter()
list.adapter = adapter
val snapHelper = PagerSnapHelper()
snapHelper.attachToRecyclerView(list)
list.addItemDecoration(CirclePagerIndicatorDecoration())
}
class LocalAdapter: RecyclerView.Adapter<LocalAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LocalAdapter.ViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.testpager_page, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: LocalAdapter.ViewHolder, position: Int) {
when(position) {
0 -> {
holder.textView.text = "Page #1"
}
1 -> {
holder.textView.text = "Page #2"
}
2 -> {
holder.textView.text = "Page #3"
}
}
}
override fun getItemCount(): Int = 3
inner class ViewHolder(override val containerView: View) : RecyclerView.ViewHolder(containerView),
LayoutContainer
}
}
Layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
/>
</RelativeLayout>
Modify adapter to support multiple layout.
class LocalAdapter(val viewModel: QuoteSetupViewModel, val fragmentManager: FragmentManager): RecyclerView.Adapter<LocalAdapter.ViewHolder>() {
override fun getItemViewType(position: Int): Int {
return when(position) {
0 -> {
R.layout.quotesetup_language
}
1 -> {
R.layout.quotesetup_time
}
else -> {
R.layout.testpager_page
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LocalAdapter.ViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(viewType, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: LocalAdapter.ViewHolder, position: Int) {
when(position) {
0 -> {
// update holder view
}
1 -> {
// update holder view
}
3 -> {
// update holder view
}
}
}
override fun getItemCount(): Int = 3
inner class ViewHolder(override val containerView: View) : RecyclerView.ViewHolder(containerView),
LayoutContainer
}
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