(#2) Add attendance vote feature.

app/src/main/java/com/mashup/api/notice/NoticeService.kt

@@ -1,9 +1,10 @@
 package com.mashup.api.notice
 
 import com.mashup.model.Notice
+import com.mashup.model.VoteStatus
+import io.reactivex.Completable
 import io.reactivex.Flowable
-import retrofit2.http.GET
-import retrofit2.http.Query
+import retrofit2.http.*
 
 interface NoticeService {
 
@@ -16,4 +17,8 @@ interface NoticeService {
 
     @GET("api/notices/")
     fun getNoticeList(): Flowable<List<Notice>>
+
+    @PATCH("api/notices/attendances/{id}/")
+    fun updateNoticeAttendance(@Path("id") userId: Int, @Body voteStatus: VoteStatus): Completable
+
 }

app/src/main/java/com/mashup/app/notices/NoticesFragment.kt

@@ -6,6 +6,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import com.mashup.databinding.NoticesFragmentBinding
+import com.mashup.util.EventObserver
 import org.koin.androidx.viewmodel.ext.android.viewModel
 
 class NoticesFragment : Fragment() {
@@ -33,6 +34,7 @@ class NoticesFragment : Fragment() {
         super.onActivityCreated(savedInstanceState)
         viewDataBinding.setLifecycleOwner(this.viewLifecycleOwner)
         setupListAdapter()
+        setupObserver()
     }
 
     private fun setupListAdapter() {
@@ -43,4 +45,10 @@ class NoticesFragment : Fragment() {
         }
     }
 
+    private fun setupObserver() {
+        viewModel.itemChangedEvent.observe(this, EventObserver { position ->
+            listAdapter.notifyItemChanged(position)
+        })
+    }
+
 }

app/src/main/java/com/mashup/app/notices/NoticesViewModel.kt

@@ -4,7 +4,9 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import com.mashup.model.Notice
+import com.mashup.model.VoteStatus
 import com.mashup.repository.NoticesRepository
+import com.mashup.util.Event
 import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.disposables.CompositeDisposable
 import io.reactivex.schedulers.Schedulers
@@ -14,14 +16,18 @@ class NoticesViewModel(
 ) : ViewModel() {
     private val _items = MutableLiveData<List<Notice>>().apply { value = emptyList() }
     val items: LiveData<List<Notice>> = _items
+
+    private val _itemChangedEvent = MutableLiveData<Event<Int>>()
+    val itemChangedEvent: LiveData<Event<Int>> = _itemChangedEvent
+
     private val compositeDisposable = CompositeDisposable()
+    private val dummyUserId = 1
 
     init {
         getNotice()
     }
 
     private fun getNotice() {
-        val dummyUserId = 1
         compositeDisposable.add(
                 noticesRepository
                         .getNoticeList()
@@ -35,10 +41,44 @@ class NoticesViewModel(
                             }
                         }, {
                             it.printStackTrace()
+                            /* TODO 에러 발생 분기 처리 */
                         })
         )
     }
 
+    fun onClickAttendButton(noticeId: Int) {
+        compositeDisposable.add(
+                noticesRepository.updateNoticeAttendance(dummyUserId, VoteStatus.ATTEND)
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe({ updateList(noticeId, VoteStatus.ATTEND) },{ /* TODO 에러 발생 분기 처리 */ })
+        )
+    }
+
+    fun onClickAbsentButton(noticeId: Int) {
+        compositeDisposable.add(
+                noticesRepository.updateNoticeAttendance(dummyUserId, VoteStatus.ABSENT)
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe({ updateList(noticeId, VoteStatus.ABSENT) }, { /* TODO 에러 발생 분기 처리 */ })
+        )
+    }
+
+    private fun updateList(noticeId: Int, voteStatus: VoteStatus) {
+        var position = 0
+        _items.value?.apply {
+            map {
+                position++
+                if (it.pk == noticeId) {
+                    _itemChangedEvent.value = Event(position - 1)
+                    it.userAttendance = voteStatus
+                } else {
+                    it
+                }
+            }
+        }
+    }
+
     override fun onCleared() {
         compositeDisposable.clear()
         super.onCleared()

app/src/main/java/com/mashup/di/NetworkModule.kt

@@ -2,6 +2,7 @@ package com.mashup.di
 
 import com.google.gson.GsonBuilder
 import com.mashup.BuildConfig
+import com.mashup.util.EnumConverterFactory
 import okhttp3.Cache
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
@@ -36,6 +37,7 @@ val NetworkModule = module {
     single {
         Retrofit.Builder()
                 .baseUrl(BASE_URL)
+                .addConverterFactory(EnumConverterFactory())
                 .addConverterFactory(GsonConverterFactory.create(get()))
                 .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                 .client(get())

app/src/main/java/com/mashup/repository/DefaultNoticesRepository.kt

@@ -1,12 +1,15 @@
 package com.mashup.repository
 
 import com.mashup.model.Notice
+import com.mashup.model.VoteStatus
 import com.mashup.repository.source.remote.RepositoriesRemoteDataSource
+import io.reactivex.Completable
 import io.reactivex.Flowable
 
 class DefaultNoticesRepository(
         private val noticesRemoteDataSource: RepositoriesRemoteDataSource
 ) : NoticesRepository {
+
     private var cachedNotices = emptyList<Notice>()
     private var mCacheIsDirty = false
 
@@ -26,4 +29,7 @@ class DefaultNoticesRepository(
                 .doOnComplete({ mCacheIsDirty = false })
     }
 
-}
+    override fun updateNoticeAttendance(userId: Int, voteStatus: VoteStatus): Completable {
+        return noticesRemoteDataSource.updateNoticeAttendance(userId, voteStatus)
+    }
+}

app/src/main/java/com/mashup/repository/NoticesRepository.kt

@@ -1,9 +1,13 @@
 package com.mashup.repository
 
 import com.mashup.model.Notice
+import com.mashup.model.VoteStatus
+import io.reactivex.Completable
 import io.reactivex.Flowable
 
 interface NoticesRepository {
 
     fun getNoticeList(): Flowable<List<Notice>>
+
+    fun updateNoticeAttendance(userId: Int, voteStatus: VoteStatus): Completable
 }

app/src/main/java/com/mashup/repository/source/remote/NoticesRemoteDataSource.kt

@@ -2,6 +2,8 @@ package com.mashup.repository.source.remote
 
 import com.mashup.api.notice.NoticeService
 import com.mashup.model.Notice
+import com.mashup.model.VoteStatus
+import io.reactivex.Completable
 import io.reactivex.Flowable
 import io.reactivex.schedulers.Schedulers
 
@@ -10,4 +12,7 @@ class RepositoriesRemoteDataSource internal constructor(
 ) {
     fun getNoticeList(): Flowable<List<Notice>> =
             noticeService.getNoticeList().subscribeOn(Schedulers.io())
+
+    fun updateNoticeAttendance(userId: Int, voteStatus: VoteStatus): Completable =
+            noticeService.updateNoticeAttendance(userId, voteStatus).subscribeOn(Schedulers.io())
 }

app/src/main/java/com/mashup/util/EnumConverterFactory.kt

@@ -0,0 +1,27 @@
+package com.mashup.util
+
+import com.google.gson.annotations.SerializedName
+import retrofit2.Converter
+import retrofit2.Retrofit
+import java.lang.reflect.Type
+
+class EnumConverterFactory : Converter.Factory() {
+
+    override fun stringConverter(
+            type: Type,
+            annotations: Array<Annotation>,
+            retrofit: Retrofit
+    ): Converter<Enum<*>, String>? =
+        if (type is Class<*> && type.isEnum) {
+            Converter { enum ->
+                try {
+                    enum.javaClass.getField(enum.name)
+                        .getAnnotation(SerializedName::class.java)?.value
+                } catch (exception: Exception) {
+                    null
+                } ?: enum.toString()
+            }
+        } else {
+            null
+        }
+}

app/src/main/java/com/mashup/util/Event.kt

@@ -0,0 +1,44 @@
+package com.mashup.util
+
+import androidx.lifecycle.Observer
+
+/**
+ * Used as a wrapper for data that is exposed via a LiveData that represents an event.
+ */
+open class Event<out T>(private val content: T) {
+
+    @Suppress("MemberVisibilityCanBePrivate")
+    var hasBeenHandled = false
+        private set // Allow external read but not write
+
+    /**
+     * Returns the content and prevents its use again.
+     */
+    fun getContentIfNotHandled(): T? {
+        return if (hasBeenHandled) {
+            null
+        } else {
+            hasBeenHandled = true
+            content
+        }
+    }
+
+    /**
+     * Returns the content, even if it's already been handled.
+     */
+    fun peekContent(): T = content
+}
+
+/**
+ * An [Observer] for [Event]s, simplifying the pattern of checking if the [Event]'s content has
+ * already been handled.
+ *
+ * [onEventUnhandledContent] is *only* called if the [Event]'s contents has not been handled.
+ */
+class EventObserver<T>(private val onEventUnhandledContent: (T) -> Unit) : Observer<Event<T>> {
+    override fun onChanged(event: Event<T>?) {
+        event?.getContentIfNotHandled()?.let {
+            onEventUnhandledContent(it)
+        }
+    }
+}

app/src/main/res/drawable/notice_attendance_button_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="@color/author" />
+</shape>

app/src/main/res/drawable/notice_attendance_button_ripple.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/author">
+    <item android:drawable="@android:color/white" />
+</ripple>

app/src/main/res/layout/notice_item.xml

@@ -5,7 +5,9 @@
     <data>
 
         <import type="android.widget.CompoundButton" />
+
         <import type="com.mashup.R" />
+
         <import type="com.mashup.model.VoteStatus" />
 
         <variable
@@ -83,9 +85,9 @@
                 android:drawableStart="@drawable/icon_date"
                 android:drawablePadding="4dp"
                 android:gravity="center_vertical"
-                app:noticeTime="@{notice.startAt}"
                 android:textColor="@color/text"
                 android:textSize="@dimen/text_normal"
+                app:noticeTime="@{notice.startAt}"
                 tools:text="MASH-UP" />
 
 
@@ -97,10 +99,10 @@
                 android:drawableStart="@drawable/icon_clock"
                 android:drawablePadding="4dp"
                 android:gravity="center_vertical"
-                app:startAt="@{notice.startAt}"
-                app:duration="@{notice.duration}"
                 android:textColor="@color/text"
                 android:textSize="@dimen/text_normal"
+                app:duration="@{notice.duration}"
+                app:startAt="@{notice.startAt}"
                 tools:text="MASH-UP" />
 
             <TextView
@@ -169,12 +171,14 @@
                     android:layout_height="wrap_content"
                     android:layout_gravity="center"
                     android:layout_weight="1"
+                    android:background="@{notice.userAttendance == VoteStatus.ATTEND ? @drawable/notice_attendance_button_background : @drawable/notice_attendance_button_ripple}"
+                    android:clickable="@{notice.userAttendance != VoteStatus.ATTEND}"
                     android:drawablePadding="6dp"
                     android:gravity="center"
+                    android:onClick="@{() -> viewmodel.onClickAttendButton(notice.pk)}"
                     android:paddingTop="8dp"
                     android:paddingBottom="8dp"
                     android:textSize="@dimen/text_small"
-                    app:backgroundResource="@{notice.userAttendance == VoteStatus.ATTEND ? R.color.author : R.color.colorWhite}"
                     tools:text="MASH-UP" />
 
                 <View
@@ -187,12 +191,14 @@
                     android:layout_height="wrap_content"
                     android:layout_gravity="center"
                     android:layout_weight="1"
+                    android:background="@{notice.userAttendance == VoteStatus.ABSENT ? @drawable/notice_attendance_button_background : @drawable/notice_attendance_button_ripple}"
+                    android:clickable="@{notice.userAttendance != VoteStatus.ABSENT}"
                     android:drawablePadding="6dp"
                     android:gravity="center"
+                    android:onClick="@{() -> viewmodel.onClickAbsentButton(notice.pk)}"
                     android:paddingTop="8dp"
                     android:paddingBottom="8dp"
                     android:textSize="@dimen/text_small"
-                    app:backgroundResource="@{notice.userAttendance == VoteStatus.ABSENT ? R.color.author : R.color.colorWhite}"
                     tools:text="MASH-UP" />
             </LinearLayout>
         </LinearLayout>