I am trying to implement Paging 3, Binding, and Room, but it does not show any data on the RecyclerView. Following some code snipped of the different components of the code.
AssetEntity.kt
@Entity(tableName = "tbl_assets")
data class AssetEntity(
@PrimaryKey(autoGenerate = true)
var id: Int = 0,
var barcode: String = String(),
var description: String = String(),
var brand: String = String(),
var lastUpdate: String = String(),
...
)
AssetDao.kt
@Dao
interface AssetDao {
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertAssetList(assetEntityList: List<AssetEntity>): List<Long>
@Query("DELETE FROM tbl_assets")
suspend fun deleteAssets(): Int
@Query("SELECT * FROM tbl_assets ORDER BY page_key ASC ")
fun getPagedAssetList(): PagingSource<Int,AssetEntity>
}
AssetRepositoryImpl.kt
class AssetRepositoryImpl(
private val context: Context,
private val networkService: NetworkService,
private val dao: AssetDao,
private val mapper: ItemDtoMapper,
): AssetRepository {
private val preferenceManager = PreferenceManager(context)
override suspend fun getAssetList(token: String): List<AssetEntity> {
val response = networkService.getItemList(token)
return mapper.toDomainList(response.data)
}
override fun getPagedAssetsDb(): PagingSource<Int,AssetEntity> {
return dao.getPagedAssetList()
}
...
}
AssetListViewModel.kt
@HiltViewModel
class AssetListViewModel
@Inject
constructor(repository: AssetRepository) : ViewModel() {
val allAssets = Pager(
config = PagingConfig(
pageSize = 60,
enablePlaceholders = true,
maxSize = 200
)
) {
repository.getPagedAssetsDb()
}.flow.cachedIn(viewModelScope)
}
AssetPageAdapter.kt
class AssetPageAdapter(private val interaction: Interaction? = null):
PagingDataAdapter<AssetEntity, AssetPageAdapter.AssetViewHolder>(DIFF_CALLBACK) {
private lateinit var binding: RecyclerviewAssetBinding
companion object{
val DIFF_CALLBACK : DiffUtil.ItemCallback<AssetEntity> = object : DiffUtil.ItemCallback<AssetEntity>(){
override fun areItemsTheSame(oldItem: AssetEntity, newItem: AssetEntity): Boolean {
return oldItem.id== newItem.id
}
override fun areContentsTheSame(oldItem: AssetEntity, newItem: AssetEntity): Boolean {
return oldItem == newItem
}
}
}
private val differ: AsyncListDiffer<AssetEntity> = AsyncListDiffer(this, DIFF_CALLBACK)
fun submitList(assets: List<AssetEntity>){
differ.submitList(assets)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) : AssetViewHolder {
binding = RecyclerviewAssetBinding.inflate(LayoutInflater.from(parent.context),parent,false)
return AssetViewHolder(binding,interaction)
}
override fun onBindViewHolder(holder: AssetViewHolder, position: Int) {
holder.bind(differ.currentList[position])
}
override fun getItemCount() = differ.currentList.size
inner class AssetViewHolder
constructor(
val view: RecyclerviewAssetBinding,
private val interaction: Interaction?
): RecyclerView.ViewHolder(view.root){
fun bind(item: AssetEntity) {
view.root.setOnClickListener {
interaction?.onItemSelected(absoluteAdapterPosition,item)
}
view.assetDescription.text = item.description
view.assetBarcode.text = item.barcode
}
}
interface Interaction{
fun onItemSelected(position: Int, item: AssetEntity)
}
}
AssetListFragment.kt
@AndroidEntryPoint
class AssetListFragment : Fragment(), AssetPageAdapter.Interaction{
private val viewModel: AssetListViewModel by viewModels()
lateinit var assetPageAdapter: AssetPageAdapter
private lateinit var navController: NavController
private var _binding: FragmentAssetListBinding? = null
private val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentAssetListBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
navController = Navigation.findNavController(view)
//binding.assetsRecyclerview.layoutManager = LinearLayoutManager(activity)
assetPageAdapter = AssetPageAdapter(this)
binding.assetsRecyclerview.adapter = assetPageAdapter
lifecycleScope.launch {
viewModel.allAssets.collectLatest {
println("Item: {$it}")
assetPageAdapter.submitData(it)
}
}
}
...
}
fragment_asset_list.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".framework.presentation.ui.AssetListFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/assets_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/new_asset_floating_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:contentDescription="@string/new_asset"
app:srcCompat="@drawable/ic_add_white_24"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
recyclerview_asset.xml
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/assets_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
app:cardCornerRadius="10dp"
app:cardElevation="10dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/asset_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/asset_white_72"
android:contentDescription="@string/app_name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toStartOf="@id/asset_description"/>
<TextView
android:id="@+id/asset_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:text=""
android:textSize="16sp"
android:textColor="@color/blue_900"
app:layout_constraintStart_toEndOf="@+id/asset_image"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="@id/asset_barcode"/>
<TextView
android:id="@+id/asset_barcode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="@color/blue_500"
app:layout_constraintStart_toStartOf="@+id/asset_description"
app:layout_constraintTop_toBottomOf="@+id/asset_description" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
any help is appreciated, it should be a silly error somewhere, but I have been 3 days working on it and I haven't been able to find the error. I don't get any error on the log, so I am a bit lost at this point. Help anyone?
