From a03206c3f72bd907920031e3d62a1a6d0abf7e0a Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Wed, 29 Jan 2020 12:15:39 +0000 Subject: [PATCH 01/20] Having the list backed by network only --- .../java/com/example/android/codelabs/paging/model/Repo.kt | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt b/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt index bb42ab69..db16cd61 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt @@ -33,4 +33,9 @@ data class Repo( @field:SerializedName("stargazers_count") val stars: Int, @field:SerializedName("forks_count") val forks: Int, @field:SerializedName("language") val language: String? -) +){ + + override fun toString(): String { + return "Repo(name='$name', stars=$stars)" + } +} From ede976b5c56e645644e0aadf4345947f8ffce966 Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Wed, 29 Jan 2020 18:49:23 +0000 Subject: [PATCH 02/20] Showing an infinite scrolling list, from network, with Flow --- .../java/com/example/android/codelabs/paging/model/Repo.kt | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt b/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt index db16cd61..bb42ab69 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/model/Repo.kt @@ -33,9 +33,4 @@ data class Repo( @field:SerializedName("stargazers_count") val stars: Int, @field:SerializedName("forks_count") val forks: Int, @field:SerializedName("language") val language: String? -){ - - override fun toString(): String { - return "Repo(name='$name', stars=$stars)" - } -} +) From b9a0c42ff807ff571f733ebf8a69cdd996bce08b Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Mon, 24 Feb 2020 15:30:38 +0000 Subject: [PATCH 03/20] Adding ViewBinding --- app/build.gradle | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/app/build.gradle b/app/build.gradle index a2f57917..2be4272b 100644 --- a/app/build.gradle +++ b/app/build.gradle @@ -49,6 +49,10 @@ android { viewBinding { enabled = true } + + buildFeatures { + viewBinding = true + } } dependencies { From 38dfd9c1f0a41d0048e73c2c1244c3ff948242f6 Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Tue, 10 Mar 2020 14:29:02 +0000 Subject: [PATCH 04/20] Making the project compatible with Android Studio 3.6 --- app/build.gradle | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/app/build.gradle b/app/build.gradle index 2be4272b..1e79a494 100644 --- a/app/build.gradle +++ b/app/build.gradle @@ -50,8 +50,8 @@ android { enabled = true } - buildFeatures { - viewBinding = true + viewBinding { + enabled = true } } From faaa6d0bf7e104f6aacb2cebbc2a950fd0580354 Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Mon, 4 May 2020 11:01:00 +0100 Subject: [PATCH 05/20] Steps 5-9 Migrating to Paging 3.0 --- .../paging/data/GithubPagingSource.kt | 50 ++++++++ .../codelabs/paging/data/GithubRepository.kt | 83 ++----------- .../codelabs/paging/ui/ReposAdapter.kt | 9 +- .../paging/ui/SearchRepositoriesActivity.kt | 110 +++++++----------- .../paging/ui/SearchRepositoriesViewModel.kt | 40 +++---- 5 files changed, 121 insertions(+), 171 deletions(-) create mode 100644 app/src/main/java/com/example/android/codelabs/paging/data/GithubPagingSource.kt diff --git a/app/src/main/java/com/example/android/codelabs/paging/data/GithubPagingSource.kt b/app/src/main/java/com/example/android/codelabs/paging/data/GithubPagingSource.kt new file mode 100644 index 00000000..5e7dda97 --- /dev/null +++ b/app/src/main/java/com/example/android/codelabs/paging/data/GithubPagingSource.kt @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2018 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.example.android.codelabs.paging.data + +import androidx.paging.PagingSource +import com.example.android.codelabs.paging.api.GithubService +import com.example.android.codelabs.paging.api.IN_QUALIFIER +import com.example.android.codelabs.paging.model.Repo +import retrofit2.HttpException +import java.io.IOException + +// GitHub page API is 1 based: https://developer.github.com/v3/#pagination +private const val GITHUB_STARTING_PAGE_INDEX = 1 + +class GithubPagingSource( + private val service: GithubService, + private val query: String +) : PagingSource() { + override suspend fun load(params: LoadParams): LoadResult { + val position = params.key ?: GITHUB_STARTING_PAGE_INDEX + val apiQuery = query + IN_QUALIFIER + return try { + val response = service.searchRepos(apiQuery, position, params.loadSize) + val repos = response.items + LoadResult.Page( + data = repos, + prevKey = if (position == GITHUB_STARTING_PAGE_INDEX) null else position - 1, + nextKey = if (repos.isEmpty()) null else position + 1 + ) + } catch (exception: IOException) { + LoadResult.Error(exception) + } catch (exception: HttpException) { + LoadResult.Error(exception) + } + } +} diff --git a/app/src/main/java/com/example/android/codelabs/paging/data/GithubRepository.kt b/app/src/main/java/com/example/android/codelabs/paging/data/GithubRepository.kt index 77000d4f..1b18eb34 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/data/GithubRepository.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/data/GithubRepository.kt @@ -17,95 +17,28 @@ package com.example.android.codelabs.paging.data import android.util.Log +import androidx.paging.Pager +import androidx.paging.PagingConfig +import androidx.paging.PagingData import com.example.android.codelabs.paging.api.GithubService -import com.example.android.codelabs.paging.api.IN_QUALIFIER import com.example.android.codelabs.paging.model.Repo -import com.example.android.codelabs.paging.model.RepoSearchResult -import kotlinx.coroutines.ExperimentalCoroutinesApi -import kotlinx.coroutines.FlowPreview -import kotlinx.coroutines.channels.ConflatedBroadcastChannel import kotlinx.coroutines.flow.Flow -import kotlinx.coroutines.flow.asFlow -import retrofit2.HttpException -import java.io.IOException - -// GitHub page API is 1 based: https://developer.github.com/v3/#pagination -private const val GITHUB_STARTING_PAGE_INDEX = 1 /** * Repository class that works with local and remote data sources. */ -@ExperimentalCoroutinesApi class GithubRepository(private val service: GithubService) { - // keep the list of all results received - private val inMemoryCache = mutableListOf() - - // keep channel of results. The channel allows us to broadcast updates so - // the subscriber will have the latest data - private val searchResults = ConflatedBroadcastChannel() - - // keep the last requested page. When the request is successful, increment the page number. - private var lastRequestedPage = GITHUB_STARTING_PAGE_INDEX - - // avoid triggering multiple requests in the same time - private var isRequestInProgress = false - /** * Search repositories whose names match the query, exposed as a stream of data that will emit * every time we get more data from the network. */ - suspend fun getSearchResultStream(query: String): Flow { + fun getSearchResultStream(query: String): Flow> { Log.d("GithubRepository", "New query: $query") - lastRequestedPage = 1 - inMemoryCache.clear() - requestAndSaveData(query) - - return searchResults.asFlow() - } - - suspend fun requestMore(query: String) { - if (isRequestInProgress) return - val successful = requestAndSaveData(query) - if (successful) { - lastRequestedPage++ - } - } - - suspend fun retry(query: String) { - if (isRequestInProgress) return - requestAndSaveData(query) - } - - private suspend fun requestAndSaveData(query: String): Boolean { - isRequestInProgress = true - var successful = false - - val apiQuery = query + IN_QUALIFIER - try { - val response = service.searchRepos(apiQuery, lastRequestedPage, NETWORK_PAGE_SIZE) - Log.d("GithubRepository", "response $response") - val repos = response.items ?: emptyList() - inMemoryCache.addAll(repos) - val reposByName = reposByName(query) - searchResults.offer(RepoSearchResult.Success(reposByName)) - successful = true - } catch (exception: IOException) { - searchResults.offer(RepoSearchResult.Error(exception)) - } catch (exception: HttpException) { - searchResults.offer(RepoSearchResult.Error(exception)) - } - isRequestInProgress = false - return successful - } - - private fun reposByName(query: String): List { - // from the in memory cache select only the repos whose name or description matches - // the query. Then order the results. - return inMemoryCache.filter { - it.name.contains(query, true) || - (it.description != null && it.description.contains(query, true)) - }.sortedWith(compareByDescending { it.stars }.thenBy { it.name }) + return Pager( + config = PagingConfig(pageSize = NETWORK_PAGE_SIZE), + pagingSourceFactory = { GithubPagingSource(service, query) } + ).flow } companion object { diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/ReposAdapter.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposAdapter.kt index d959d265..3a5a4e73 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/ui/ReposAdapter.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposAdapter.kt @@ -17,20 +17,21 @@ package com.example.android.codelabs.paging.ui import android.view.ViewGroup +import androidx.paging.PagingDataAdapter import androidx.recyclerview.widget.DiffUtil -import androidx.recyclerview.widget.ListAdapter +import androidx.recyclerview.widget.RecyclerView.ViewHolder import com.example.android.codelabs.paging.model.Repo /** * Adapter for the list of repositories. */ -class ReposAdapter : ListAdapter(REPO_COMPARATOR) { +class ReposAdapter : PagingDataAdapter(REPO_COMPARATOR) { - override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): androidx.recyclerview.widget.RecyclerView.ViewHolder { + override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder { return RepoViewHolder.create(parent) } - override fun onBindViewHolder(holder: androidx.recyclerview.widget.RecyclerView.ViewHolder, position: Int) { + override fun onBindViewHolder(holder: ViewHolder, position: Int) { val repoItem = getItem(position) if (repoItem != null) { (holder as RepoViewHolder).bind(repoItem) diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt index 64cad7ae..2ac79b48 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt @@ -20,18 +20,18 @@ import android.os.Bundle import android.view.KeyEvent import android.view.View import android.view.inputmethod.EditorInfo -import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import androidx.lifecycle.ViewModelProvider -import androidx.lifecycle.observe +import androidx.lifecycle.lifecycleScope +import androidx.paging.ExperimentalPagingApi import androidx.recyclerview.widget.DividerItemDecoration -import androidx.recyclerview.widget.LinearLayoutManager -import androidx.recyclerview.widget.RecyclerView -import androidx.recyclerview.widget.RecyclerView.OnScrollListener import com.example.android.codelabs.paging.Injection import com.example.android.codelabs.paging.databinding.ActivitySearchRepositoriesBinding -import com.example.android.codelabs.paging.model.RepoSearchResult import kotlinx.coroutines.ExperimentalCoroutinesApi +import kotlinx.coroutines.Job +import kotlinx.coroutines.flow.collect +import kotlinx.coroutines.flow.collectLatest +import kotlinx.coroutines.launch @ExperimentalCoroutinesApi class SearchRepositoriesActivity : AppCompatActivity() { @@ -40,6 +40,18 @@ class SearchRepositoriesActivity : AppCompatActivity() { private lateinit var viewModel: SearchRepositoriesViewModel private val adapter = ReposAdapter() + private var searchJob: Job? = null + + private fun search(query: String) { + // Make sure we cancel the previous job before creating a new one + searchJob?.cancel() + searchJob = lifecycleScope.launch { + viewModel.searchRepo(query).collectLatest { + adapter.submitData(it) + } + } + } + override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivitySearchRepositoriesBinding.inflate(layoutInflater) @@ -53,13 +65,10 @@ class SearchRepositoriesActivity : AppCompatActivity() { // add dividers between RecyclerView's row items val decoration = DividerItemDecoration(this, DividerItemDecoration.VERTICAL) binding.list.addItemDecoration(decoration) - setupScrollListener() initAdapter() val query = savedInstanceState?.getString(LAST_SEARCH_QUERY) ?: DEFAULT_QUERY - if (viewModel.repoResult.value == null) { - viewModel.searchRepo(query) - } + search(query) initSearch(query) } @@ -70,75 +79,42 @@ class SearchRepositoriesActivity : AppCompatActivity() { private fun initAdapter() { binding.list.adapter = adapter - viewModel.repoResult.observe(this) { result -> - when (result) { - is RepoSearchResult.Success -> { - showEmptyList(result.data.isEmpty()) - adapter.submitList(result.data) - } - is RepoSearchResult.Error -> { - Toast.makeText( - this, - "\uD83D\uDE28 Wooops $result.message}", - Toast.LENGTH_LONG - ).show() - } - } - } } - private fun initSearch(query: String) { - binding.searchRepo.setText(query) +private fun initSearch(query: String) { + binding.searchRepo.setText(query) - binding.searchRepo.setOnEditorActionListener { _, actionId, _ -> - if (actionId == EditorInfo.IME_ACTION_GO) { - updateRepoListFromInput() - true - } else { - false - } - } - binding.searchRepo.setOnKeyListener { _, keyCode, event -> - if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) { - updateRepoListFromInput() - true - } else { - false - } + binding.searchRepo.setOnEditorActionListener { _, actionId, _ -> + if (actionId == EditorInfo.IME_ACTION_GO) { + updateRepoListFromInput() + true + } else { + false } } - - private fun updateRepoListFromInput() { - binding.searchRepo.text.trim().let { - if (it.isNotEmpty()) { - binding.list.scrollToPosition(0) - viewModel.searchRepo(it.toString()) - } + binding.searchRepo.setOnKeyListener { _, keyCode, event -> + if (event.action == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) { + updateRepoListFromInput() + true + } else { + false } } - private fun showEmptyList(show: Boolean) { - if (show) { - binding.emptyList.visibility = View.VISIBLE - binding.list.visibility = View.GONE - } else { - binding.emptyList.visibility = View.GONE - binding.list.visibility = View.VISIBLE + lifecycleScope.launch { + @OptIn(ExperimentalPagingApi::class) + adapter.dataRefreshFlow.collect { + binding.list.scrollToPosition(0) } } +} - private fun setupScrollListener() { - val layoutManager = binding.list.layoutManager as LinearLayoutManager - binding.list.addOnScrollListener(object : OnScrollListener() { - override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { - super.onScrolled(recyclerView, dx, dy) - val totalItemCount = layoutManager.itemCount - val visibleItemCount = layoutManager.childCount - val lastVisibleItem = layoutManager.findLastVisibleItemPosition() - - viewModel.listScrolled(visibleItemCount, lastVisibleItem, totalItemCount) + private fun updateRepoListFromInput() { + binding.searchRepo.text.trim().let { + if (it.isNotEmpty()) { + search(it.toString()) } - }) + } } companion object { diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesViewModel.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesViewModel.kt index e7748559..cdb849b0 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesViewModel.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesViewModel.kt @@ -17,11 +17,15 @@ package com.example.android.codelabs.paging.ui import androidx.lifecycle.* +import androidx.paging.PagingData +import androidx.paging.cachedIn import com.example.android.codelabs.paging.data.GithubRepository +import com.example.android.codelabs.paging.model.Repo import com.example.android.codelabs.paging.model.RepoSearchResult import kotlinx.coroutines.Dispatchers import kotlinx.coroutines.ExperimentalCoroutinesApi import kotlinx.coroutines.FlowPreview +import kotlinx.coroutines.flow.Flow import kotlinx.coroutines.launch /** @@ -30,34 +34,20 @@ import kotlinx.coroutines.launch */ @ExperimentalCoroutinesApi class SearchRepositoriesViewModel(private val repository: GithubRepository) : ViewModel() { + private var currentQueryValue: String? = null - companion object { - private const val VISIBLE_THRESHOLD = 5 - } + private var currentSearchResult: Flow>? = null - private val queryLiveData = MutableLiveData() - val repoResult: LiveData = queryLiveData.switchMap { queryString -> - liveData { - val repos = repository.getSearchResultStream(queryString).asLiveData(Dispatchers.Main) - emitSource(repos) + fun searchRepo(queryString: String): Flow> { + val lastResult = currentSearchResult + if (queryString == currentQueryValue && lastResult != null) { + return lastResult } + currentQueryValue = queryString + val newResult: Flow> = repository.getSearchResultStream(queryString) + .cachedIn(viewModelScope) + currentSearchResult = newResult + return newResult } - /** - * Search a repository based on a query string. - */ - fun searchRepo(queryString: String) { - queryLiveData.postValue(queryString) - } - - fun listScrolled(visibleItemCount: Int, lastVisibleItemPosition: Int, totalItemCount: Int) { - if (visibleItemCount + lastVisibleItemPosition + VISIBLE_THRESHOLD >= totalItemCount) { - val immutableQuery = queryLiveData.value - if (immutableQuery != null) { - viewModelScope.launch { - repository.requestMore(immutableQuery) - } - } - } - } } \ No newline at end of file From 5a07d19ccede46f0ad94c10b2e8b14e4277f7a71 Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Mon, 4 May 2020 11:01:00 +0100 Subject: [PATCH 06/20] Steps 5-9 Migrating to Paging 3.0 --- .../android/codelabs/paging/ui/SearchRepositoriesActivity.kt | 1 - 1 file changed, 1 deletion(-) diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt index 2ac79b48..edfb52dc 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt @@ -29,7 +29,6 @@ import com.example.android.codelabs.paging.Injection import com.example.android.codelabs.paging.databinding.ActivitySearchRepositoriesBinding import kotlinx.coroutines.ExperimentalCoroutinesApi import kotlinx.coroutines.Job -import kotlinx.coroutines.flow.collect import kotlinx.coroutines.flow.collectLatest import kotlinx.coroutines.launch From cfdb89d76c4c6eb5e0991285a8ba01f80e409b3b Mon Sep 17 00:00:00 2001 From: Florina Muntenescu Date: Mon, 4 May 2020 11:25:29 +0100 Subject: [PATCH 07/20] Adding a loading state footer --- .../paging/ui/ReposLoadStateAdapter.kt | 33 +++++++++++ .../paging/ui/ReposLoadStateViewHolder.kt | 56 +++++++++++++++++++ .../paging/ui/SearchRepositoriesActivity.kt | 7 ++- .../repos_load_state_footer_view_item.xml | 45 +++++++++++++++ 4 files changed, 139 insertions(+), 2 deletions(-) create mode 100644 app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateAdapter.kt create mode 100644 app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateViewHolder.kt create mode 100644 app/src/main/res/layout/repos_load_state_footer_view_item.xml diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateAdapter.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateAdapter.kt new file mode 100644 index 00000000..1350bd66 --- /dev/null +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateAdapter.kt @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2020 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.example.android.codelabs.paging.ui + +import android.view.ViewGroup +import androidx.paging.LoadState +import androidx.paging.LoadStateAdapter + +class ReposLoadStateAdapter( + private val retry: () -> Unit +) : LoadStateAdapter() { + override fun onBindViewHolder(holder: ReposLoadStateViewHolder, loadState: LoadState) { + holder.bind(loadState) + } + + override fun onCreateViewHolder(parent: ViewGroup, loadState: LoadState): ReposLoadStateViewHolder { + return ReposLoadStateViewHolder.create(parent, retry) + } +} diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateViewHolder.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateViewHolder.kt new file mode 100644 index 00000000..c2ff3942 --- /dev/null +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/ReposLoadStateViewHolder.kt @@ -0,0 +1,56 @@ +/* + * Copyright (C) 2020 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.example.android.codelabs.paging.ui + +import android.view.LayoutInflater +import android.view.View +import android.view.ViewGroup +import androidx.core.view.isVisible +import androidx.paging.LoadState +import androidx.recyclerview.widget.RecyclerView +import com.example.android.codelabs.paging.R +import com.example.android.codelabs.paging.databinding.ReposLoadStateFooterViewItemBinding + +class ReposLoadStateViewHolder( + private val binding: ReposLoadStateFooterViewItemBinding, + retry: () -> Unit +) : RecyclerView.ViewHolder(binding.root) { + + init { + binding.retryButton.also { + it.setOnClickListener { retry.invoke() } + } + } + + fun bind(loadState: LoadState) { + if (loadState is LoadState.Error) { + binding.errorMsg.text = loadState.error.localizedMessage + } + binding.progressBar.isVisible = loadState is LoadState.Loading + binding.retryButton.isVisible = loadState !is LoadState.Loading + binding.errorMsg.isVisible = loadState !is LoadState.Loading + } + + companion object { + fun create(parent: ViewGroup, retry: () -> Unit): ReposLoadStateViewHolder { + val view = LayoutInflater.from(parent.context) + .inflate(R.layout.repos_load_state_footer_view_item, parent, false) + val binding = ReposLoadStateFooterViewItemBinding.bind(view) + return ReposLoadStateViewHolder(binding, retry) + } + } +} diff --git a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt index edfb52dc..a6dd1b9c 100644 --- a/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt +++ b/app/src/main/java/com/example/android/codelabs/paging/ui/SearchRepositoriesActivity.kt @@ -18,7 +18,6 @@ package com.example.android.codelabs.paging.ui import android.os.Bundle import android.view.KeyEvent -import android.view.View import android.view.inputmethod.EditorInfo import androidx.appcompat.app.AppCompatActivity import androidx.lifecycle.ViewModelProvider @@ -29,6 +28,7 @@ import com.example.android.codelabs.paging.Injection import com.example.android.codelabs.paging.databinding.ActivitySearchRepositoriesBinding import kotlinx.coroutines.ExperimentalCoroutinesApi import kotlinx.coroutines.Job +import kotlinx.coroutines.flow.collect import kotlinx.coroutines.flow.collectLatest import kotlinx.coroutines.launch @@ -77,7 +77,10 @@ class SearchRepositoriesActivity : AppCompatActivity() { } private fun initAdapter() { - binding.list.adapter = adapter + binding.list.adapter = adapter.withLoadStateHeaderAndFooter( + header = ReposLoadStateAdapter { adapter.retry() }, + footer = ReposLoadStateAdapter { adapter.retry() } + ) } private fun initSearch(query: String) { diff --git a/app/src/main/res/layout/repos_load_state_footer_view_item.xml b/app/src/main/res/layout/repos_load_state_footer_view_item.xml new file mode 100644 index 00000000..2183cd29 --- /dev/null +++ b/app/src/main/res/layout/repos_load_state_footer_view_item.xml @@ -0,0 +1,45 @@ + + + + + + +