I am trying to create full screen image slider with viewpager2. But when I am running the code, first page is not showing any image, but when I swipe to another page and revisit first page, then image is showing. I tried everything but could not find the problem. Please help. Here's my code.
PS - I changed the images to color to see the layout on screen easily. The same thing is happening even when I am passing images list instead of color list to my adapter.
My Adapter :
class FullScreenImageAdapter(val context: Context, val sliderItems: MutableList<Int>, val viewPager2: ViewPager2) : RecyclerView.Adapter<FullScreenImageAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.fullscreen_image_container,
parent, false))
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.imageView.setBackgroundResource(sliderItems[position])
}
override fun getItemCount(): Int {
return sliderItems.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: ImageView= itemView.findViewById(R.id.fullImageId)
}
}
fullscreen_image_container.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fullImageId"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="centerCrop">
</ImageView>
Code in my fragment :
class FullScreenImageFragment : Fragment() {
lateinit var viewPager2: ViewPager2
lateinit var navController: NavController
lateinit var sliderAdapter: FullScreenImageAdapter
var sliderImages: MutableList<Int> = mutableListOf()
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_full_screen_image, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
navController = view.findNavController()
sliderImages.add(R.color.Green)
sliderImages.add(R.color.Orange)
sliderImages.add(R.color.black)
sliderImages.add(R.color.colorchery)
header_layout_fullscreen.app_name_header.visibility = View.GONE
header_layout_fullscreen.image_back_btn.setOnClickListener {
navController.navigateUp()
}
viewPager2 = view.findViewById(R.id.full_image_viewpager) as ViewPager2
sliderAdapter = FullScreenImageAdapter(requireContext(), sliderImages, viewPager2)
viewPager2.adapter = sliderAdapter
}
}
fragment_full_screen_image.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".ui.FullScreenImageFragment">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/full_image_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Thanks
EDIT :- I created a new activity and shifted all my code from fragment to activity, and it is working completely fine there. I still don't know what is the problem with fragment. I would still like to know the issue with fragment if anyone of you can find it. I prefer to use single activity in an application but I will use this workaround for now.