Added database persistence ability

app/build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id 'kotlin-kapt'
 }
 
 android {
@@ -47,4 +48,7 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+    implementation "androidx.room:room-runtime:2.5.1"
+    kapt "androidx.room:room-compiler:2.5.1"
 }

app/src/main/java/com/denizk0461/studip/activity/MainActivity.kt

@@ -11,7 +11,9 @@ import androidx.navigation.ui.setupActionBarWithNavController
 import android.view.Menu
 import android.view.MenuItem
 import com.denizk0461.studip.R
+import com.denizk0461.studip.data.Dependencies
 import com.denizk0461.studip.databinding.ActivityMainBinding
+import com.denizk0461.studip.db.EventRepository
 
 class MainActivity : AppCompatActivity() {
 
@@ -22,9 +24,12 @@ class MainActivity : AppCompatActivity() {
         WindowCompat.setDecorFitsSystemWindows(window, false)
         super.onCreate(savedInstanceState)
 
+        Dependencies.repo = EventRepository(application)
+
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
+
         setSupportActionBar(binding.toolbar)
 
         val navController = findNavController(R.id.nav_host_fragment_content_main)

app/src/main/java/com/denizk0461/studip/adapter/StudIPEventAdapter.kt

@@ -1,12 +1,10 @@
 package com.denizk0461.studip.adapter
 
-import android.util.Log
 import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import com.denizk0461.studip.data.StudIPEvent
 import com.denizk0461.studip.databinding.ItemEventBinding
-import com.denizk0461.studip.databinding.ItemEventPageBinding
 
 class StudIPEventAdapter(private val events: List<StudIPEvent>) : RecyclerView.Adapter<StudIPEventAdapter.EventViewHolder>() {
 
@@ -24,24 +22,13 @@ class StudIPEventAdapter(private val events: List<StudIPEvent>) : RecyclerView.A
 
     override fun onBindViewHolder(holder: EventViewHolder, position: Int) {
         val currentItem = events[position]
-//        var itemCount = 0
-//        events.filter { it.day == position }.forEach { event ->
-//            val newView = ItemEventBinding.inflate(
-//                LayoutInflater.from(holder.binding.root.context),
-//                holder.binding.root,
-//                false
-//            ).also { item ->
-//                Log.d("HELLO", "generating ${event.title}...2")
-//                itemCount += 1
+
         holder.binding.textTitle.text = currentItem.title
-        holder.binding.textLecturers.text = currentItem.lecturer.joinToString(", ")
+        holder.binding.textLecturers.text = currentItem.lecturer
         holder.binding.textRoom.text = currentItem.room
         holder.binding.textTimeslot.text = currentItem.timeslot
-//            }
-//            holder.binding.pageLayout.addView(newView.root)
-//        }
-//        if (itemCount == 0) {
-//            // TODO inflate view saying "no events!" or sth
-//        }
+
+        // TODO inflate view saying "no events!" or sth
+
     }
 }

app/src/main/java/com/denizk0461/studip/adapter/StudIPEventPageAdapter.kt

@@ -1,13 +1,10 @@
 package com.denizk0461.studip.adapter
 
-import android.util.Log
 import android.view.LayoutInflater
 import android.view.ViewGroup
-import android.widget.LinearLayout
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.denizk0461.studip.data.StudIPEvent
-import com.denizk0461.studip.databinding.ItemEventBinding
 import com.denizk0461.studip.databinding.ItemEventPageBinding
 
 class StudIPEventPageAdapter(private val events: List<StudIPEvent>) : RecyclerView.Adapter<StudIPEventPageAdapter.EventPageViewHolder>() {
@@ -29,26 +26,7 @@ class StudIPEventPageAdapter(private val events: List<StudIPEvent>) : RecyclerVi
         holder.binding.pageRecyclerView.apply {
             layoutManager = LinearLayoutManager(holder.binding.root.context, LinearLayoutManager.VERTICAL, false)
             adapter = StudIPEventAdapter(events.filter { it.day == position }) // TODO check if empty
+            scheduleLayoutAnimation()
         }
-
-//        var itemCount = 0
-//        events.filter { it.day == position }.forEach { event ->
-//            val newView = ItemEventBinding.inflate(
-//                LayoutInflater.from(holder.binding.root.context),
-//                holder.binding.root,
-//                false
-//            ).also { item ->
-//                Log.d("HELLO", "generating ${event.title}...2")
-//                itemCount += 1
-//                item.textTitle.text = event.title
-//                item.textLecturers.text = event.lecturer.joinToString(", ")
-//                item.textRoom.text = event.room
-//                item.textTimeslot.text = event.timeslot
-//            }
-//            holder.binding.pageLayout.addView(newView.root)
-//        }
-//        if (itemCount == 0) {
-//            // TODO inflate view saying "no events!" or sth
-//        }
     }
 }

app/src/main/java/com/denizk0461/studip/data/Dependencies.kt

@@ -0,0 +1,7 @@
+package com.denizk0461.studip.data
+
+import com.denizk0461.studip.db.EventRepository
+
+object Dependencies {
+    lateinit var repo: EventRepository
+}

app/src/main/java/com/denizk0461/studip/data/DummyData.kt

@@ -3,12 +3,12 @@ package com.denizk0461.studip.data
 object DummyData {
 
     val events: Array<StudIPEvent> = arrayOf(
-        StudIPEvent("Literatures", arrayOf("Nittel"), "MZH 1380/1400", 0, 3, 1),
-        StudIPEvent("Linguistics", arrayOf("Du Bois"), "SFG 1020", 1, 1, 1),
-        StudIPEvent("System Erde", arrayOf("Zolitschka", "Labuhn-Deroubaix"), "GW2 B1410", 1, 3, 1),
-        StudIPEvent("Key Moments", arrayOf("Esders-Angermund"), "GW2 B2890", 2, 2, 1),
-        StudIPEvent("ULS-1", arrayOf("Herrmann"), "GW2 B2890", 2, 3, 1),
-        StudIPEvent("Gesellschaft und Raum", arrayOf("Lossau", "Mossig"), "GW2 B1820", 3, 1, 1),
-        StudIPEvent("Gesellschaft und Raum2", arrayOf("Lossau", "Mossig"), "GW2 B1820", 4, 4, 2),
+        StudIPEvent(1, "Literatures", "Nittel", "MZH 1380/1400", 0, 3, 1),
+        StudIPEvent(2, "Linguistics", "Du Bois", "SFG 1020", 1, 1, 1),
+        StudIPEvent(3, "System Erde", "Zolitschka, Labuhn-Deroubaix", "GW2 B1410", 1, 3, 1),
+        StudIPEvent(4, "Key Moments", "Esders-Angermund", "GW2 B2890", 2, 2, 1),
+        StudIPEvent(5, "ULS-1", "Herrmann", "GW2 B2890", 2, 3, 1),
+        StudIPEvent(6, "Gesellschaft und Raum", "Lossau, Mossig", "GW2 B1820", 3, 1, 1),
+        StudIPEvent(7, "Gesellschaft und Raum2", "Lossau, Mossig", "GW2 B1820", 4, 4, 2),
     )
 }

app/src/main/java/com/denizk0461/studip/data/StudIPEvent.kt

@@ -1,18 +1,24 @@
 package com.denizk0461.studip.data
 
+import androidx.room.Entity
+import androidx.room.Ignore
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "events")
 data class StudIPEvent(
+    @PrimaryKey val id: Int,
     val title: String, // the name of the event
-    val lecturer: Array<String>, // the lecturer(s)
-    val room: String, // the room the event takes place in; assumes that the room doesn't change
+    val lecturer: String, // the lecturer(s)
+    val room: String, // the room the event takes place in
     val day: Int, // 0 = Monday, 1 = Tuesday, 2 = Wednesday, 3 = Thursday, 4 = Friday
     val timeslotStart: Int, // 0 = 08:15, 1 = 10:15, 2 = 12:15, 3 = 14:15, 4 = 16:15, 5 = 18:15
     val timeslots: Int, // the amount of timeslots the course takes place over (1 timeslot = 90min)
 ) {
 
-    private val timeSlotStartTimes: List<String> = listOf("08:15", "10:15", "12:15", "14:15", "16:15", "18:15")
-    private val timeSlotEndTimes: List<String> = listOf("09:45", "11:45", "13:45", "15:45", "17:45", "19:45")
+    @Ignore private val timeSlotStartTimes: List<String> = listOf("08:15", "10:15", "12:15", "14:15", "16:15", "18:15")
+    @Ignore private val timeSlotEndTimes: List<String> = listOf("09:45", "11:45", "13:45", "15:45", "17:45", "19:45")
 
-    val timeslot: String =
+    @Ignore val timeslot: String =
         "${timeSlotStartTimes[timeslotStart]} – ${timeSlotEndTimes[timeslotStart + timeslots - 1]}"
 
     override fun equals(other: Any?): Boolean {
@@ -26,9 +32,18 @@ data class StudIPEvent(
 
         return true
     }
+
     override fun hashCode(): Int {
-        var result = title.hashCode()
-        result = 31 * result + lecturer.contentHashCode()
+        var result = id
+        result = 31 * result + title.hashCode()
+        result = 31 * result + lecturer.hashCode()
+        result = 31 * result + room.hashCode()
+        result = 31 * result + day
+        result = 31 * result + timeslotStart
+        result = 31 * result + timeslots
+        result = 31 * result + timeSlotStartTimes.hashCode()
+        result = 31 * result + timeSlotEndTimes.hashCode()
+        result = 31 * result + timeslot.hashCode()
         return result
     }
 }

app/src/main/java/com/denizk0461/studip/db/EventDAO.kt

@@ -0,0 +1,20 @@
+package com.denizk0461.studip.db
+
+import androidx.lifecycle.LiveData
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.denizk0461.studip.data.StudIPEvent
+
+@Dao
+interface EventDAO {
+
+    @get:Query("SELECT * FROM events ORDER BY id")
+    val allEvents: LiveData<List<StudIPEvent>>
+
+    @Insert
+    fun insertEvent(event: StudIPEvent)
+
+    @Query("DELETE FROM events")
+    fun nukeEvents()
+}

app/src/main/java/com/denizk0461/studip/db/EventDatabase.kt

@@ -0,0 +1,30 @@
+package com.denizk0461.studip.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import com.denizk0461.studip.data.StudIPEvent
+
+@Database(entities = [StudIPEvent::class], version = 1)
+abstract class EventDatabase : RoomDatabase() {
+
+    abstract fun dao(): EventDAO
+
+    companion object {
+        private var instance: EventDatabase? = null
+
+        fun getInstance(context: Context): EventDatabase {
+            if (instance == null) {
+                synchronized(EventDatabase::class) {
+                    instance = Room.databaseBuilder(
+                        context.applicationContext,
+                        EventDatabase::class.java,
+                        "event_db"
+                    ).build()
+                }
+            }
+            return instance!!
+        }
+    }
+}

app/src/main/java/com/denizk0461/studip/db/EventRepository.kt

@@ -0,0 +1,15 @@
+package com.denizk0461.studip.db
+
+import android.app.Application
+import androidx.lifecycle.LiveData
+import com.denizk0461.studip.data.StudIPEvent
+
+class EventRepository(app: Application) {
+
+    private val dao: EventDAO = EventDatabase.getInstance(app.applicationContext).dao()
+
+    val allEvents: LiveData<List<StudIPEvent>> = dao.allEvents
+
+    fun nukeEvents() { dao.nukeEvents() }
+    fun insertEvent(event: StudIPEvent) { dao.insertEvent(event) }
+}

app/src/main/java/com/denizk0461/studip/fragment/EventFragment.kt

@@ -5,18 +5,21 @@ import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.PagerSnapHelper
 import com.denizk0461.studip.adapter.StudIPEventPageAdapter
 import com.denizk0461.studip.data.DummyData
-import com.denizk0461.studip.databinding.FragmentFirstBinding
+import com.denizk0461.studip.databinding.FragmentEventBinding
+import com.denizk0461.studip.viewmodel.EventViewModel
 
 /**
  * A simple [Fragment] subclass as the default destination in the navigation.
  */
-class FirstFragment : Fragment() {
+class EventFragment : Fragment() {
 
-    private var _binding: FragmentFirstBinding? = null
+    private var _binding: FragmentEventBinding? = null
 
     // This property is only valid between onCreateView and
     // onDestroyView.
@@ -24,19 +27,25 @@ class FirstFragment : Fragment() {
     private lateinit var recyclerViewAdapter: StudIPEventPageAdapter
     private lateinit var recyclerViewLayoutManager: LinearLayoutManager
 
-    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
-        _binding = FragmentFirstBinding.inflate(inflater, container, false)
+    private val viewModel: EventViewModel by viewModels()
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+        _binding = FragmentEventBinding.inflate(inflater, container, false)
         return binding.root
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        recyclerViewAdapter = StudIPEventPageAdapter(DummyData.events.toList())
-        binding.recyclerView.adapter = recyclerViewAdapter
-        recyclerViewLayoutManager = LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false)
-        binding.recyclerView.layoutManager = recyclerViewLayoutManager
-        PagerSnapHelper().attachToRecyclerView(binding.recyclerView)
+        viewModel.allEvents.observe(viewLifecycleOwner) { events ->
+            recyclerViewAdapter = StudIPEventPageAdapter(DummyData.events.toList())
+            binding.recyclerView.adapter = recyclerViewAdapter
+            recyclerViewLayoutManager =
+                LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false)
+            binding.recyclerView.layoutManager = recyclerViewLayoutManager
+            PagerSnapHelper().attachToRecyclerView(binding.recyclerView)
+            binding.recyclerView.scheduleLayoutAnimation()
+        }
 
 //        binding.buttonFirst.setOnClickListener {
 //            findNavController().navigate(R.id.action_FirstFragment_to_SecondFragment)

app/src/main/java/com/denizk0461/studip/viewmodel/EventViewModel.kt

@@ -0,0 +1,13 @@
+package com.denizk0461.studip.viewmodel
+
+import android.app.Application
+import androidx.lifecycle.LiveData
+import com.denizk0461.studip.data.StudIPEvent
+
+class EventViewModel(app: Application) : TemplateViewModel(app) {
+
+    val allEvents: LiveData<List<StudIPEvent>> = repo.allEvents
+
+    fun insertEvent(event: StudIPEvent) { repo.insertEvent(event) }
+    fun nukeEvents() { repo.nukeEvents() }
+}

app/src/main/java/com/denizk0461/studip/viewmodel/TemplateViewModel.kt

@@ -0,0 +1,25 @@
+package com.denizk0461.studip.viewmodel
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.denizk0461.studip.data.Dependencies
+import com.denizk0461.studip.db.EventRepository
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
+
+open class TemplateViewModel(app: Application) : AndroidViewModel(app) {
+
+    protected val repo: EventRepository = Dependencies.repo
+
+    fun doAsync(function: () -> Unit) {
+        viewModelScope.launch(Dispatchers.IO) {
+            function()
+        }
+    }
+
+    fun <T> returnBlocking(function: () -> T): T = runBlocking(Dispatchers.IO) {
+        function()
+    }
+}

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

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".fragment.FirstFragment">
+    tools:context=".fragment.EventFragment">
 
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/recycler_view"

app/src/main/res/navigation/nav_graph.xml

@@ -7,9 +7,9 @@
 
     <fragment
         android:id="@+id/FirstFragment"
-        android:name="com.denizk0461.studip.fragment.FirstFragment"
+        android:name="com.denizk0461.studip.fragment.EventFragment"
         android:label="@string/first_fragment_label"
-        tools:layout="@layout/fragment_first">
+        tools:layout="@layout/fragment_event">
 
         <action
             android:id="@+id/action_FirstFragment_to_SecondFragment"