Add Chapters query

Author: lorensr

app/src/main/graphql/guide/graphql/toc/Chapters.graphql

@@ -0,0 +1,7 @@
+queryChapters{
+chapters{
+id
+number
+title
+ }
+}

app/src/main/java/guide/graphql/toc/data/Apollo.kt

@@ -0,0 +1,11 @@
+packageguide.graphql.toc.data
+
+importcom.apollographql.apollo.ApolloClient
+
+object Apollo{
+val client:ApolloClient by lazy{
+ApolloClient.builder()
+ .serverUrl("https://api.graphql.guide/graphql")
+ .build()
+ }
+}

app/src/main/java/guide/graphql/toc/ui/chapters/ChaptersAdapter.kt

@@ -2,19 +2,22 @@ package guide.graphql.toc.ui.chapters
 
 importandroid.content.Context
 importandroid.view.LayoutInflater
+importandroid.view.View
 importandroid.view.ViewGroup
 importandroidx.recyclerview.widget.RecyclerView
+importguide.graphql.toc.ChaptersQuery
+importguide.graphql.toc.R
 importguide.graphql.toc.databinding.ChapterBinding
 
 classChaptersAdapter(
 privatevalcontext:Context,
-privatevarchapters:List<String> = listOf(),
-privatevalonItemClicked: ((String) ->Unit)
+privatevarchapters:List<ChaptersQuery.Chapter> = listOf(),
+privatevalonItemClicked: ((ChaptersQuery.Chapter) ->Unit)
 ) : RecyclerView.Adapter<ChaptersAdapter.ViewHolder>(){
 
 classViewHolder(valbinding:ChapterBinding) : RecyclerView.ViewHolder(binding.root)
 
-funupdateChapters(chapters:List<String>){
+funupdateChapters(chapters:List<ChaptersQuery.Chapter>){
 this.chapters = chapters
  notifyDataSetChanged()
  }
@@ -30,8 +33,20 @@ class ChaptersAdapter(
 
 overridefunonBindViewHolder(holder:ViewHolder, position:Int){
 val chapter = chapters[position]
-
- holder.binding.chapterHeader.text = chapter
+val header =
+if (chapter.number ==null) chapter.title else context.getString(
+R.string.chapter_number,
+ chapter.number.toInt().toString()
+ )
+
+ holder.binding.chapterHeader.text = header
+if (chapter.number ==null){
+ holder.binding.chapterSubheader.visibility =View.GONE
+
+ } else{
+ holder.binding.chapterSubheader.text = chapter.title
+ holder.binding.chapterSubheader.visibility =View.VISIBLE
+ }
 
  holder.binding.root.setOnClickListener{
  onItemClicked.invoke(chapter)

app/src/main/java/guide/graphql/toc/ui/chapters/ChaptersFragment.kt

@@ -6,11 +6,16 @@ import android.view.View
 importandroid.view.ViewGroup
 importandroid.widget.Toast
 importandroidx.fragment.app.Fragment
+importandroidx.lifecycle.lifecycleScope
 importandroidx.navigation.fragment.findNavController
 importandroidx.recyclerview.widget.DividerItemDecoration
 importandroidx.recyclerview.widget.LinearLayoutManager
+importcom.apollographql.apollo.coroutines.toDeferred
+importcom.apollographql.apollo.exception.ApolloException
 importcom.google.android.material.transition.MaterialSharedAxis
+importguide.graphql.toc.ChaptersQuery
 importguide.graphql.toc.R
+importguide.graphql.toc.data.Apollo
 importguide.graphql.toc.databinding.ChaptersFragmentBinding
 
 classChaptersFragment : Fragment(){
@@ -45,25 +50,42 @@ class ChaptersFragment : Fragment(){
  ){chapter ->
  findNavController().navigate(
 ChaptersFragmentDirections.viewSections(
- chapterId =10,
- chapterNumber =10,
- chapterTitle = getString(
+ chapterId =chapter.id,
+ chapterNumber =chapter.number?.toInt() ?:-1,
+ chapterTitle =if (chapter.number ==null) chapter.title elsegetString(
 R.string.chapter_title,
-"10",
-"Android Dev"
+chapter.number.toInt().toString(),
+chapter.title
  )
  )
  )
  }
 
 val layoutManager =LinearLayoutManager(requireContext())
  binding.chapters.layoutManager = layoutManager
-
+
 val itemDivider =DividerItemDecoration(requireContext(), layoutManager.orientation)
  binding.chapters.addItemDecoration(itemDivider)
  binding.chapters.adapter = adapter
 
- adapter.updateChapters(listOf("Android Dev"))
+ lifecycleScope.launchWhenStarted{
+try{
+val response =Apollo.client.query(
+ChaptersQuery()
+ ).toDeferred().await()
+
+if (response.hasErrors()){
+throwException(response.errors?.get(0)?.message)
+ }
+
+val chapters = response.data?.chapters ?:throwException("Data is null")
+ adapter.updateChapters(chapters)
+ } catch (e:ApolloException){
+ showErrorMessage("GraphQL request failed")
+ } catch (e:Exception){
+ showErrorMessage(e.message.orEmpty())
+ }
+ }
  }
 
 overridefunonDestroyView(){