SamueldaCostaAraujoNunes

@ExperimentalPagingApi
class CharacterRemoteMediador (
    private val name: String,
    private val dao: CharacterDao,
    private val service: CharacterService
) : RemoteMediator<Int, java.lang.Character>() {

    override suspend fun load(
        loadType: LoadType,
        state: PagingState<Int, java.lang.Character>

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 fun getCharacters(query: String): Flow<PagingData<java.lang.Character>> = Pager(
        config = PagingConfig(
            pageSize = 20,
            enablePlaceholders = false
        ),
        pagingSourceFactory = { dao.getPagingSource("%$query%") },
        remoteMediator = CharacterRemoteMediador(query, dao, service)
    ).flow

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fun characters(query: String): LiveData<PagingData<Character>> =
        characterRepository.getCharacters(query).cachedIn(viewModelScope).asLiveData()

SamueldaCostaAraujoNunes

package br.com.samuelnunes.rickandmortyapp.ui.characters

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.fragment.app.activityViewModels
import androidx.fragment.app.viewModels
import androidx.paging.ExperimentalPagingApi

SamueldaCostaAraujoNunes

class MainViewModel : ViewModel() {

    private val _query = MutableLiveData<String>()
    val query: LiveData<String> = _query

    val onQueryTextListener = object : SearchView.OnQueryTextListener {
        override fun onQueryTextSubmit(query: String?): Boolean {
            if (query != null) {
                _query.postValue(query.lowercase())
            }

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private val viewModel by viewModels<MainViewModel>()

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override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.menu_main_activity, menu)
        val item = menu?.findItem(R.id.search)
        val searchView = item?.actionView as SearchView
        searchView.setOnQueryTextListener(viewModel.onQueryTextListener)
        return super.onCreateOptionsMenu(menu)
    }

SamueldaCostaAraujoNunes

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/search"
        android:icon="@drawable/ic_search"
        android:title="Pesquise o personagem"
        app:actionViewClass="androidx.appcompat.widget.SearchView"
        app:showAsAction="collapseActionView|ifRoom" />
</menu>

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viewModel.characters().observe(viewLifecycleOwner) {
            adapter.submitData(lifecycle, it)
        }

SamueldaCostaAraujoNunes

class CharacterAdapter : PagingDataAdapter<Character, CharacterAdapter.CharacterViewHolder>(CharacterAdapter)