05_02e

app/src/main/java/com/example/plainolnotes4/MainFragment.kt

@@ -39,7 +39,7 @@ class MainFragment : Fragment(),
             addItemDecoration(divider)
         }
 
-        viewModel.notesList.observe(viewLifecycleOwner, Observer {
+        viewModel.notesList?.observe(viewLifecycleOwner, Observer {
             Log.i("noteLogging", it.toString())
             adapter = NotesListAdapter(it, this@MainFragment)
             binding.recyclerView.adapter = adapter
@@ -62,7 +62,8 @@ class MainFragment : Fragment(),
     }
 
     private fun addSampleData(): Boolean {
-        TODO("Not yet implemented")
+        viewModel.addSampleData()
+        return true
     }
 
     override fun onItemClick(noteId: Int) {

app/src/main/java/com/example/plainolnotes4/MainViewModel.kt

@@ -1,15 +1,29 @@
 package com.example.plainolnotes4
 
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.plainolnotes4.data.AppDatabase
 import com.example.plainolnotes4.data.NoteEntity
 import com.example.plainolnotes4.data.SampleDataProvider
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
-class MainViewModel : ViewModel() {
+class MainViewModel(app: Application) : AndroidViewModel(app) {
 
-    val notesList = MutableLiveData<List<NoteEntity>>()
+    private val database = AppDatabase.getInstance(app)
+    val notesList = database?.noteDao()?.getAll()
 
-    init {
-        notesList.value = SampleDataProvider.getNotes()
+    fun addSampleData() {
+        viewModelScope.launch {
+            withContext(Dispatchers.IO) {
+                val sampleNotes = SampleDataProvider.getNotes()
+                database?.noteDao()?.insertAll(sampleNotes)
+            }
+        }
     }
+
 }

app/src/main/java/com/example/plainolnotes4/data/SampleDataProvider.kt

@@ -18,9 +18,9 @@ class SampleDataProvider {
         }
 
         fun getNotes() = arrayListOf(
-            NoteEntity(1, getDate(0), sampleText1),
-            NoteEntity(2, getDate(1), sampleText2),
-            NoteEntity(3, getDate(2), sampleText3)
+            NoteEntity(getDate(0), sampleText1),
+            NoteEntity(getDate(1), sampleText2),
+            NoteEntity(getDate(2), sampleText3)
         )
 
     }