Add conferences (#1004)

app/src/main/java/io/github/wulkanowy/data/RepositoryModule.kt

@@ -154,4 +154,8 @@ internal class RepositoryModule {
     @Singleton
     @Provides
     fun provideSchoolInfoDao(database: AppDatabase) = database.schoolDao
+
+    @Singleton
+    @Provides
+    fun provideConferenceDao(database: AppDatabase) = database.conferenceDao
 }

app/src/main/java/io/github/wulkanowy/data/db/AppDatabase.kt

@@ -10,6 +10,7 @@ import androidx.room.migration.Migration
 import io.github.wulkanowy.data.db.dao.AttendanceDao
 import io.github.wulkanowy.data.db.dao.AttendanceSummaryDao
 import io.github.wulkanowy.data.db.dao.CompletedLessonsDao
+import io.github.wulkanowy.data.db.dao.ConferenceDao
 import io.github.wulkanowy.data.db.dao.ExamDao
 import io.github.wulkanowy.data.db.dao.GradeDao
 import io.github.wulkanowy.data.db.dao.GradePointsStatisticsDao
@@ -32,6 +33,7 @@ import io.github.wulkanowy.data.db.dao.TimetableDao
 import io.github.wulkanowy.data.db.entities.Attendance
 import io.github.wulkanowy.data.db.entities.AttendanceSummary
 import io.github.wulkanowy.data.db.entities.CompletedLesson
+import io.github.wulkanowy.data.db.entities.Conference
 import io.github.wulkanowy.data.db.entities.Exam
 import io.github.wulkanowy.data.db.entities.Grade
 import io.github.wulkanowy.data.db.entities.GradePointsStatistics
@@ -70,6 +72,7 @@ import io.github.wulkanowy.data.db.migrations.Migration24
 import io.github.wulkanowy.data.db.migrations.Migration25
 import io.github.wulkanowy.data.db.migrations.Migration26
 import io.github.wulkanowy.data.db.migrations.Migration27
+import io.github.wulkanowy.data.db.migrations.Migration28
 import io.github.wulkanowy.data.db.migrations.Migration3
 import io.github.wulkanowy.data.db.migrations.Migration4
 import io.github.wulkanowy.data.db.migrations.Migration5
@@ -103,7 +106,8 @@ import javax.inject.Singleton
         Recipient::class,
         MobileDevice::class,
         Teacher::class,
-        School::class
+        School::class,
+        Conference::class,
     ],
     version = AppDatabase.VERSION_SCHEMA,
     exportSchema = true
@@ -112,7 +116,7 @@ import javax.inject.Singleton
 abstract class AppDatabase : RoomDatabase() {
 
     companion object {
-        const val VERSION_SCHEMA = 27
+        const val VERSION_SCHEMA = 28
 
         fun getMigrations(sharedPrefProvider: SharedPrefProvider): Array<Migration> {
             return arrayOf(
@@ -142,6 +146,7 @@ abstract class AppDatabase : RoomDatabase() {
                 Migration25(),
                 Migration26(),
                 Migration27(),
+                Migration28(),
             )
         }
 
@@ -198,4 +203,6 @@ abstract class AppDatabase : RoomDatabase() {
     abstract val teacherDao: TeacherDao
 
     abstract val schoolDao: SchoolDao
+
+    abstract val conferenceDao: ConferenceDao
 }

app/src/main/java/io/github/wulkanowy/data/db/dao/ConferenceDao.kt

@@ -0,0 +1,15 @@
+package io.github.wulkanowy.data.db.dao
+
+import androidx.room.Dao
+import androidx.room.Query
+import io.github.wulkanowy.data.db.entities.Conference
+import kotlinx.coroutines.flow.Flow
+import javax.inject.Singleton
+
+@Dao
+@Singleton
+interface ConferenceDao : BaseDao<Conference> {
+
+    @Query("SELECT * FROM Conferences WHERE diary_id = :diaryId AND student_id = :studentId")
+    fun loadAll(diaryId: Int, studentId: Int): Flow<List<Conference>>
+}

app/src/main/java/io/github/wulkanowy/data/db/entities/Conference.kt

@@ -0,0 +1,35 @@
+package io.github.wulkanowy.data.db.entities
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import java.io.Serializable
+import java.time.LocalDateTime
+
+@Entity(tableName = "Conferences")
+data class Conference(
+
+    @ColumnInfo(name = "student_id")
+    val studentId: Int,
+
+    @ColumnInfo(name = "diary_id")
+    val diaryId: Int,
+
+    val title: String,
+
+    val subject: String,
+
+    val agenda: String,
+
+    @ColumnInfo(name = "present_on_conference")
+    val presentOnConference: String,
+
+    @ColumnInfo(name = "conference_id")
+    val conferenceId: Int,
+
+    val date: LocalDateTime
+) : Serializable {
+
+    @PrimaryKey(autoGenerate = true)
+    var id: Long = 0
+}

app/src/main/java/io/github/wulkanowy/data/db/migrations/Migration28.kt

@@ -0,0 +1,23 @@
+package io.github.wulkanowy.data.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration28 : Migration(27, 28) {
+
+    override fun migrate(database: SupportSQLiteDatabase) {
+        database.execSQL("""
+            CREATE TABLE IF NOT EXISTS Conferences (
+                id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                student_id INTEGER NOT NULL,
+                diary_id INTEGER NOT NULL,
+                title TEXT NOT NULL,
+                subject TEXT NOT NULL,
+                agenda TEXT NOT NULL,
+                present_on_conference TEXT NOT NULL,
+                conference_id INTEGER NOT NULL,
+                date INTEGER NOT NULL
+            )
+        """)
+    }
+}

app/src/main/java/io/github/wulkanowy/data/repositories/conference/ConferenceLocal.kt

@@ -0,0 +1,25 @@
+package io.github.wulkanowy.data.repositories.conference
+
+import io.github.wulkanowy.data.db.dao.ConferenceDao
+import io.github.wulkanowy.data.db.entities.Conference
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.db.entities.Student
+import kotlinx.coroutines.flow.Flow
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class ConferenceLocal @Inject constructor(private val conferenceDb: ConferenceDao) {
+
+    fun getConferences(student: Student, semester: Semester): Flow<List<Conference>> {
+        return conferenceDb.loadAll(semester.diaryId, student.studentId)
+    }
+
+    suspend fun saveConferences(items: List<Conference>) {
+        conferenceDb.insertAll(items)
+    }
+
+    suspend fun deleteConferences(items: List<Conference>) {
+        conferenceDb.deleteAll(items)
+    }
+}

app/src/main/java/io/github/wulkanowy/data/repositories/conference/ConferenceRemote.kt

@@ -0,0 +1,31 @@
+package io.github.wulkanowy.data.repositories.conference
+
+import io.github.wulkanowy.data.db.entities.Conference
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.sdk.Sdk
+import io.github.wulkanowy.utils.init
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class ConferenceRemote @Inject constructor(private val sdk: Sdk) {
+
+    suspend fun getConferences(student: Student, semester: Semester): List<Conference> {
+        return sdk.init(student).switchDiary(semester.diaryId, semester.schoolYear)
+            .getConferences()
+            .map {
+                it.agenda
+                Conference(
+                    studentId = student.studentId,
+                    diaryId = semester.diaryId,
+                    agenda = it.agenda,
+                    conferenceId = it.id,
+                    date = it.date,
+                    presentOnConference = it.presentOnConference,
+                    subject = it.subject,
+                    title = it.title
+                )
+            }
+    }
+}

app/src/main/java/io/github/wulkanowy/data/repositories/conference/ConferenceRepository.kt

@@ -0,0 +1,25 @@
+package io.github.wulkanowy.data.repositories.conference
+
+import io.github.wulkanowy.data.db.entities.Semester
+import io.github.wulkanowy.data.db.entities.Student
+import io.github.wulkanowy.utils.networkBoundResource
+import io.github.wulkanowy.utils.uniqueSubtract
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class ConferenceRepository @Inject constructor(
+    private val local: ConferenceLocal,
+    private val remote: ConferenceRemote
+) {
+
+    fun getConferences(student: Student, semester: Semester, forceRefresh: Boolean) = networkBoundResource(
+        shouldFetch = { it.isEmpty() || forceRefresh },
+        query = { local.getConferences(student, semester) },
+        fetch = { remote.getConferences(student, semester) },
+        saveFetchResult = { old, new ->
+            local.deleteConferences(old uniqueSubtract new)
+            local.saveConferences(new uniqueSubtract old)
+        }
+    )
+}

app/src/main/java/io/github/wulkanowy/ui/modules/conference/ConferenceAdapter.kt

@@ -0,0 +1,36 @@
+package io.github.wulkanowy.ui.modules.conference
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import io.github.wulkanowy.data.db.entities.Conference
+import io.github.wulkanowy.databinding.ItemConferenceBinding
+import io.github.wulkanowy.utils.toFormattedString
+import javax.inject.Inject
+
+class ConferenceAdapter @Inject constructor() :
+    RecyclerView.Adapter<ConferenceAdapter.ItemViewHolder>() {
+
+    var items = emptyList<Conference>()
+
+    override fun getItemCount() = items.size
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = ItemViewHolder(
+        ItemConferenceBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+    )
+
+    override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
+        val item = items[position]
+        with(holder.binding) {
+            conferenceItemDate.text = item.date.toFormattedString("dd.MM.yyyy HH:mm")
+            conferenceItemName.text = item.presentOnConference
+            conferenceItemTitle.text = item.title
+            conferenceItemSubject.text = item.subject
+            conferenceItemContent.text = item.agenda
+            conferenceItemContent.visibility = if (item.agenda.isBlank()) View.GONE else View.VISIBLE
+        }
+    }
+
+    class ItemViewHolder(val binding: ItemConferenceBinding) : RecyclerView.ViewHolder(binding.root)
+}

app/src/main/java/io/github/wulkanowy/ui/modules/conference/ConferenceFragment.kt

@@ -0,0 +1,102 @@
+package io.github.wulkanowy.ui.modules.conference
+
+import android.os.Bundle
+import android.view.View
+import androidx.recyclerview.widget.LinearLayoutManager
+import dagger.hilt.android.AndroidEntryPoint
+import io.github.wulkanowy.R
+import io.github.wulkanowy.data.db.entities.Conference
+import io.github.wulkanowy.databinding.FragmentConferenceBinding
+import io.github.wulkanowy.ui.base.BaseFragment
+import io.github.wulkanowy.ui.modules.main.MainView
+import io.github.wulkanowy.ui.widgets.DividerItemDecoration
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class ConferenceFragment : BaseFragment<FragmentConferenceBinding>(R.layout.fragment_conference),
+    ConferenceView, MainView.TitledView {
+
+    @Inject
+    lateinit var presenter: ConferencePresenter
+
+    @Inject
+    lateinit var conferencesAdapter: ConferenceAdapter
+
+    companion object {
+        fun newInstance() = ConferenceFragment()
+    }
+
+    override val isViewEmpty: Boolean
+        get() = conferencesAdapter.items.isEmpty()
+
+    override val titleStringId: Int
+        get() = R.string.conferences_title
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        binding = FragmentConferenceBinding.bind(view)
+        messageContainer = binding.conferenceRecycler
+        presenter.onAttachView(this)
+    }
+
+    override fun initView() {
+        with(binding.conferenceRecycler) {
+            layoutManager = LinearLayoutManager(context)
+            adapter = conferencesAdapter
+            addItemDecoration(DividerItemDecoration(context))
+        }
+
+        with(binding) {
+            conferenceSwipe.setOnRefreshListener { presenter.onSwipeRefresh() }
+            conferenceErrorRetry.setOnClickListener { presenter.onRetry() }
+            conferenceErrorDetails.setOnClickListener { presenter.onDetailsClick() }
+        }
+    }
+
+    override fun updateData(data: List<Conference>) {
+        with(conferencesAdapter) {
+            items = data
+            notifyDataSetChanged()
+        }
+    }
+
+    override fun clearData() {
+        with(conferencesAdapter) {
+            items = emptyList()
+            notifyDataSetChanged()
+        }
+    }
+
+    override fun hideRefresh() {
+        binding.conferenceSwipe.isRefreshing = false
+    }
+
+    override fun showProgress(show: Boolean) {
+        binding.conferenceProgress.visibility = if (show) View.VISIBLE else View.GONE
+    }
+
+    override fun showEmpty(show: Boolean) {
+        binding.conferenceEmpty.visibility = if (show) View.VISIBLE else View.GONE
+    }
+
+    override fun showErrorView(show: Boolean) {
+        binding.conferenceError.visibility = if (show) View.VISIBLE else View.GONE
+    }
+
+    override fun setErrorDetails(message: String) {
+        binding.conferenceErrorMessage.text = message
+    }
+
+    override fun enableSwipe(enable: Boolean) {
+        binding.conferenceSwipe.isEnabled = enable
+    }
+
+    override fun showContent(show: Boolean) {
+        binding.conferenceRecycler.visibility = if (show) View.VISIBLE else View.GONE
+    }
+
+    override fun onDestroyView() {
+        presenter.onDetachView()
+        super.onDestroyView()
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/conference/ConferencePresenter.kt

@@ -0,0 +1,96 @@
+package io.github.wulkanowy.ui.modules.conference
+
+import io.github.wulkanowy.data.Status
+import io.github.wulkanowy.data.repositories.conference.ConferenceRepository
+import io.github.wulkanowy.data.repositories.semester.SemesterRepository
+import io.github.wulkanowy.data.repositories.student.StudentRepository
+import io.github.wulkanowy.ui.base.BasePresenter
+import io.github.wulkanowy.ui.base.ErrorHandler
+import io.github.wulkanowy.utils.AnalyticsHelper
+import io.github.wulkanowy.utils.afterLoading
+import io.github.wulkanowy.utils.flowWithResourceIn
+import kotlinx.coroutines.flow.onEach
+import timber.log.Timber
+import javax.inject.Inject
+
+class ConferencePresenter @Inject constructor(
+    errorHandler: ErrorHandler,
+    studentRepository: StudentRepository,
+    private val semesterRepository: SemesterRepository,
+    private val conferenceRepository: ConferenceRepository,
+    private val analytics: AnalyticsHelper
+) : BasePresenter<ConferenceView>(errorHandler, studentRepository) {
+
+    private lateinit var lastError: Throwable
+
+    override fun onAttachView(view: ConferenceView) {
+        super.onAttachView(view)
+        view.initView()
+        Timber.i("Conferences view was initialized")
+        errorHandler.showErrorMessage = ::showErrorViewOnError
+        loadData()
+    }
+
+    fun onSwipeRefresh() {
+        loadData(true)
+    }
+
+    fun onRetry() {
+        view?.run {
+            showErrorView(false)
+            showProgress(true)
+        }
+        loadData(true)
+    }
+
+    fun onDetailsClick() {
+        view?.showErrorDetailsDialog(lastError)
+    }
+
+    private fun showErrorViewOnError(message: String, error: Throwable) {
+        view?.run {
+            if (isViewEmpty) {
+                lastError = error
+                setErrorDetails(message)
+                showErrorView(true)
+                showEmpty(false)
+            } else showError(message, error)
+        }
+    }
+
+    private fun loadData(forceRefresh: Boolean = false) {
+        flowWithResourceIn {
+            val student = studentRepository.getCurrentStudent()
+            val semester = semesterRepository.getCurrentSemester(student)
+            conferenceRepository.getConferences(student, semester, forceRefresh)
+        }.onEach {
+            when (it.status) {
+                Status.LOADING -> Timber.i("Loading conference data started")
+                Status.SUCCESS -> {
+                    Timber.i("Loading conference result: Success")
+                    view?.run {
+                        updateData(it.data!!.sortedByDescending { conference -> conference.date })
+                        showContent(it.data.isNotEmpty())
+                        showEmpty(it.data.isEmpty())
+                        showErrorView(false)
+                    }
+                    analytics.logEvent(
+                        "load_data",
+                        "type" to "conferences",
+                        "items" to it.data!!.size
+                    )
+                }
+                Status.ERROR -> {
+                    Timber.i("Loading conference result: An exception occurred")
+                    errorHandler.dispatch(it.error!!)
+                }
+            }
+        }.afterLoading {
+            view?.run {
+                hideRefresh()
+                showProgress(false)
+                enableSwipe(true)
+            }
+        }.launch()
+    }
+}

app/src/main/java/io/github/wulkanowy/ui/modules/conference/ConferenceView.kt

@@ -0,0 +1,29 @@
+package io.github.wulkanowy.ui.modules.conference
+
+import io.github.wulkanowy.data.db.entities.Conference
+import io.github.wulkanowy.ui.base.BaseView
+
+interface ConferenceView : BaseView {
+
+    val isViewEmpty: Boolean
+
+    fun initView()
+
+    fun updateData(data: List<Conference>)
+
+    fun clearData()
+
+    fun hideRefresh()
+
+    fun showEmpty(show: Boolean)
+
+    fun showErrorView(show: Boolean)
+
+    fun setErrorDetails(message: String)
+
+    fun showProgress(show: Boolean)
+
+    fun enableSwipe(enable: Boolean)
+
+    fun showContent(show: Boolean)
+}

app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreFragment.kt

@@ -9,6 +9,7 @@ import io.github.wulkanowy.R
 import io.github.wulkanowy.databinding.FragmentMoreBinding
 import io.github.wulkanowy.ui.base.BaseFragment
 import io.github.wulkanowy.ui.modules.about.AboutFragment
+import io.github.wulkanowy.ui.modules.conference.ConferenceFragment
 import io.github.wulkanowy.ui.modules.homework.HomeworkFragment
 import io.github.wulkanowy.ui.modules.luckynumber.LuckyNumberFragment
 import io.github.wulkanowy.ui.modules.main.MainActivity
@@ -53,6 +54,9 @@ class MoreFragment : BaseFragment<FragmentMoreBinding>(R.layout.fragment_more),
     override val mobileDevicesRes: Pair<String, Drawable?>?
         get() = context?.run { getString(R.string.mobile_devices_title) to getCompatDrawable(R.drawable.ic_more_mobile_devices) }
 
+    override val conferencesRes: Pair<String, Drawable?>?
+        get() = context?.run { getString(R.string.conferences_title) to getCompatDrawable(R.drawable.ic_more_conferences) }
+
     override val schoolAndTeachersRes: Pair<String, Drawable?>?
         get() = context?.run { getString(R.string.schoolandteachers_title) to getCompatDrawable((R.drawable.ic_more_schoolandteachers)) }
 
@@ -108,6 +112,10 @@ class MoreFragment : BaseFragment<FragmentMoreBinding>(R.layout.fragment_more),
         (activity as? MainActivity)?.pushView(MobileDeviceFragment.newInstance())
     }
 
+    override fun openConferencesView() {
+        (activity as? MainActivity)?.pushView(ConferenceFragment.newInstance())
+    }
+
     override fun openSchoolAndTeachersView() {
         (activity as? MainActivity)?.pushView(SchoolAndTeachersFragment.newInstance())
     }

app/src/main/java/io/github/wulkanowy/ui/modules/more/MorePresenter.kt

@@ -27,6 +27,7 @@ class MorePresenter @Inject constructor(
                 noteRes?.first -> openNoteView()
                 luckyNumberRes?.first -> openLuckyNumberView()
                 mobileDevicesRes?.first -> openMobileDevicesView()
+                conferencesRes?.first -> openConferencesView()
                 schoolAndTeachersRes?.first -> openSchoolAndTeachersView()
                 settingsRes?.first -> openSettingsView()
                 aboutRes?.first -> openAboutView()
@@ -48,6 +49,7 @@ class MorePresenter @Inject constructor(
                 noteRes,
                 luckyNumberRes,
                 mobileDevicesRes,
+                conferencesRes,
                 schoolAndTeachersRes,
                 settingsRes,
                 aboutRes

app/src/main/java/io/github/wulkanowy/ui/modules/more/MoreView.kt

@@ -15,6 +15,8 @@ interface MoreView : BaseView {
 
     val mobileDevicesRes: Pair<String, Drawable?>?
 
+    val conferencesRes: Pair<String, Drawable?>?
+
     val schoolAndTeachersRes: Pair<String, Drawable?>?
 
     val settingsRes: Pair<String, Drawable?>?
@@ -41,5 +43,7 @@ interface MoreView : BaseView {
 
     fun openMobileDevicesView()
 
+    fun openConferencesView()
+
     fun openSchoolAndTeachersView()
 }

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

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M9,13.75c-2.34,0 -7,1.17 -7,3.5L2,19h14v-1.75c0,-2.33 -4.66,-3.5 -7,-3.5zM4.34,17c0.84,-0.58 2.87,-1.25 4.66,-1.25s3.82,0.67 4.66,1.25L4.34,17zM9,12c1.93,0 3.5,-1.57 3.5,-3.5S10.93,5 9,5 5.5,6.57 5.5,8.5 7.07,12 9,12zM9,7c0.83,0 1.5,0.67 1.5,1.5S9.83,10 9,10s-1.5,-0.67 -1.5,-1.5S8.17,7 9,7zM16.04,13.81c1.16,0.84 1.96,1.96 1.96,3.44L18,19h4v-1.75c0,-2.02 -3.5,-3.17 -5.96,-3.44zM15,12c1.93,0 3.5,-1.57 3.5,-3.5S16.93,5 15,5c-0.54,0 -1.04,0.13 -1.5,0.35 0.63,0.89 1,1.98 1,3.15s-0.37,2.26 -1,3.15c0.46,0.22 0.96,0.35 1.5,0.35z" />
+</vector>

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

@@ -0,0 +1,104 @@
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.modules.conference.ConferenceFragment">
+
+    <me.zhanghai.android.materialprogressbar.MaterialProgressBar
+        android:id="@+id/conferenceProgress"
+        style="@style/Widget.MaterialProgressBar.ProgressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:indeterminate="true" />
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/conferenceSwipe"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/conferenceRecycler"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            tools:listitem="@layout/item_conference" />
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+    <LinearLayout
+        android:id="@+id/conferenceEmpty"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:padding="10dp"
+        android:visibility="gone"
+        tools:ignore="UseCompoundDrawables">
+
+        <ImageView
+            android:layout_width="100dp"
+            android:layout_height="100dp"
+            app:srcCompat="@drawable/ic_more_conferences"
+            app:tint="?colorOnBackground"
+            tools:ignore="contentDescription" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:gravity="center"
+            android:text="@string/conference_no_items"
+            android:textSize="20sp" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/conferenceError"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:visibility="invisible"
+        tools:ignore="UseCompoundDrawables"
+        tools:visibility="invisible">
+
+        <ImageView
+            android:layout_width="100dp"
+            android:layout_height="100dp"
+            app:srcCompat="@drawable/ic_error"
+            app:tint="?colorOnBackground"
+            tools:ignore="contentDescription" />
+
+        <TextView
+            android:id="@+id/conferenceErrorMessage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:gravity="center"
+            android:padding="8dp"
+            android:text="@string/error_unknown"
+            android:textSize="20sp" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:gravity="center"
+            android:orientation="horizontal">
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/conferenceErrorDetails"
+                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginEnd="8dp"
+                android:layout_marginRight="8dp"
+                android:text="@string/all_details" />
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/conferenceErrorRetry"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/all_retry" />
+        </LinearLayout>
+    </LinearLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -0,0 +1,87 @@
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/conference_item_container"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?selectableItemBackground"
+    tools:context=".ui.modules.conference.ConferenceAdapter">
+
+    <TextView
+        android:id="@+id/conferenceItemDate"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="15dp"
+        android:layout_marginTop="10dp"
+        android:textColor="?android:textColorSecondary"
+        android:textSize="15sp"
+        app:layout_constraintRight_toLeftOf="@+id/conferenceItemName"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="@tools:sample/date/ddmmyy" />
+
+    <TextView
+        android:id="@+id/conferenceItemName"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="10dp"
+        android:layout_marginTop="10dp"
+        android:layout_marginEnd="15dp"
+        android:ellipsize="end"
+        android:gravity="end"
+        android:singleLine="true"
+        android:textSize="13sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/conferenceItemDate"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="@tools:sample/full_names" />
+
+    <TextView
+        android:id="@+id/conferenceItemTitle"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="5dp"
+        android:layout_marginBottom="5dp"
+        android:ellipsize="end"
+        android:maxLines="2"
+        android:textSize="16sp"
+        app:layout_constraintEnd_toEndOf="@id/conferenceItemName"
+        app:layout_constraintStart_toStartOf="@id/conferenceItemDate"
+        app:layout_constraintTop_toBottomOf="@id/conferenceItemDate"
+        app:layout_goneMarginEnd="0dp"
+        tools:text="@tools:sample/lorem" />
+
+    <TextView
+        android:id="@+id/conferenceItemSubject"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="5dp"
+        android:layout_marginBottom="5dp"
+        android:ellipsize="end"
+        android:maxLines="2"
+        android:textSize="16sp"
+        app:layout_constraintBottom_toTopOf="@id/conferenceItemContent"
+        app:layout_constraintEnd_toEndOf="@id/conferenceItemTitle"
+        app:layout_constraintStart_toStartOf="@id/conferenceItemTitle"
+        app:layout_constraintTop_toBottomOf="@id/conferenceItemTitle"
+        app:layout_goneMarginBottom="15dp"
+        app:layout_goneMarginEnd="0dp"
+        tools:text="@tools:sample/lorem" />
+
+    <TextView
+        android:id="@+id/conferenceItemContent"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="5dp"
+        android:layout_marginBottom="15dp"
+        android:ellipsize="end"
+        android:lineSpacingMultiplier="1.2"
+        android:maxLines="2"
+        android:textSize="14sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/conferenceItemName"
+        app:layout_constraintStart_toStartOf="@id/conferenceItemDate"
+        app:layout_constraintTop_toBottomOf="@id/conferenceItemSubject"
+        tools:text="@tools:sample/lorem/random"
+        tools:visibility="visible" />
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -325,6 +325,11 @@
     <string name="teacher_no_subject">No subject</string>
 
 
+    <!--Conference-->
+    <string name="conferences_title">Conferences</string>
+    <string name="conference_no_items">No info about conferences</string>
+
+
     <!--Account-->
     <string name="account_add_new">Add account</string>
     <string name="account_logout">Logout</string>