A Library for make an easy and faster RecyclerView without adapter

implementation "com.utsman.recycling:recycling:${latest}"

implementation "com.utsman.recycling-paged:recycling:${latest}"

implementation "com.utsman.recycling-android:recycling:${latest}"

implementation "com.utsman.recycling-paged-android:recycling:${latest}"

recyclerView.setupAdapter<Item>(R.layout.item_view) { adapter, context, list ->
    ...
}

recyclerView.setupAdapterPaged<Item>(R.layout.item_view) { adapter, context, list ->
    ...
}

recyclerView.setupAdapterPaged<Item>(R.layout.item_view) { adapter, context, list ->
    
    // recycling your holder
    bind { itemView, position, item ->
        // bind view
        itemView.img_view.load(item?.url)
        itemView.setOnClickListener {
            toast("Click on $position")
        }
    }

}

recyclerView.setupAdapterPaged<Item>(R.layout.item_view) { adapter, context, list ->
    
    // recycling your layout manager
    setLayoutManager(GridLayoutManager(context))

}

recyclerView.setupAdapterPaged<Item>(R.layout.item_view) { adapter, context, list ->
    ...
    
    submitList(yourList)
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical">

    <ProgressBar
        android:id="@+id/progress_circular"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="30dp"
        tools:ignore="UnusedAttribute"
        android:indeterminateTint="@color/colorPrimary"
        android:indeterminateTintMode="src_atop" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Error"
        android:textColor="@android:color/holo_red_light"
        android:id="@+id/error_text_view"
        android:layout_margin="12dp"
        tools:ignore="HardcodedText" />

</LinearLayout>

addLoader(R.layout.item_loader) {
    idLoader = R.id.progress_circular
    idTextError = R.id.error_text_view
}

// define network state with mutable livedata
val networkState: MutableLiveData<NetworkState> = MutableLiveData()

// for error state
networkState.postValue(NetworkState.error("error network: ${t.message}"))

// for loading state
networkState.postValue(NetworkState.LOADING)

// for loaded state
networkState.postValue(NetworkState.LOADED)

// and submit in your recycling
submitNetworkState(networkState)

recyclerView.setupAdapterPaged<Item>(R.layout.item_view) { adapter, context, list ->

    ...
    
    val layoutManager = GridLayoutManager(context, 2)
    setLayoutManager(layoutManager)
    fixGridSpan(2)

}

recyclerView.setupAdapter<Item>(R.layout.item_view) { adapter, context, list ->

    ...
   
    onPagingListener(layoutManager) { page, itemCount ->
        // recycling data with page + 1
    }

}

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val listData = listOf("satu", "dua", "tiga", "empat")

        main_recycler_view.setupAdapter<String>(R.layout.simple_item_view) { adapter, context, list ->
            bind { itemView, position, item ->
                itemView.name_item.text = item
            }

            submitList(listData)
        }
    }
}

// View Model
class SampleViewModel : ViewModel() {

    private val instance = RetrofitInstance.create()
    private val networkState: MutableLiveData<NetworkState> = MutableLiveData()

    // get list
    fun getCuratedPhoto(perPage: Int, page: Int): LiveData<List<Pexel>?> {
        val newList: MutableLiveData<List<Pexel>?> = MutableLiveData()

        // network state is loading
        networkState.postValue(NetworkState.LOADING)

        // call api
        instance.getCuratedPhoto(perPage, page)
            .enqueue(object : Callback<Responses> {
                override fun onFailure(call: Call<Responses>, t: Throwable) {

                    // network state error with error message
                    networkState.postValue(NetworkState.error("error network: ${t.message}"))
                }

                override fun onResponse(call: Call<Responses>, response: Response<Responses>) {
                    val listResponse = response.body()?.photos
                    newList.postValue(listResponse)

                    // network state loaded
                    networkState.postValue(NetworkState.LOADED)
                }

            })

        return newList
    }

    // get network state
    fun getNetworkState(): LiveData<NetworkState> = networkState

}

// Activity
class MainActivity : AppCompatActivity() {

    private val viewModel by lazy {
        ViewModelProviders.of(this)[PexelViewModel::class.java]
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // setup recycling
        main_recycler_view.setupAdapter<Pexel>(R.layout.item_view) { adapter, context, list ->

            // bind is viewholder function
            bind { itemView, position, item ->

                itemView.img_view.load(item?.src?.small)
                itemView.setOnClickListener {
                    Toast.makeText(context, "wee ${adapter.itemCount} - ${list.size} - $position", Toast.LENGTH_SHORT).show()
                }
            }

            // add loader state
            addLoader(R.layout.item_loader) {
                idLoader = R.id.progress_circular
                idTextError = R.id.error_text_view
            }

            // using grid layout manager
            val layoutManager = GridLayoutManager(this@MainActivity, 2)
            setLayoutManager(layoutManager)
            
            // for grid layout manager, loader by default is ugly, to fix use fixGridSpan
            fixGridSpan(2)

            // call function setupData with page 1
            setupData(this, 1)

            // use paging listener for endless recycler view and loaded data
            onPagingListener(layoutManager) { page, itemCount ->
            
                // call function setup data with page +1
                setupData(this@setupAdapter, page+1)
            }
        }
    }

    // function for setup data
    private fun setupData(recycling: Recycling<Pexel>, page: Int) {
        viewModel.getCuratedPhoto(20, page).observe(this, Observer {
            
            // submit list from viewmodel into recycling
            recycling.submitList(it)
        })

        viewModel.getNetworkState().observe(this, Observer {
        
            // submit network state from viewmodel into recycling
            recycling.submitNetworkState(it)
        })
    }
}