create databse with callback

app/src/main/java/com/developer/kulloveth/expandablelistsamplewithroom/data/Repository.kt

@@ -1,4 +1,5 @@
 package com.developer.kulloveth.expandablelistsamplewithroom.data.model
 
 class Repository {
+
 }

app/src/main/java/com/developer/kulloveth/expandablelistsamplewithroom/data/db/ContinentDao.kt

@@ -14,5 +14,5 @@ interface ContinentDao {
     fun getAlphabetizedWords(): LiveData<List<Continents>>
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
-    suspend fun insert(continent: Continents)
+    fun insert(continent: Continents)
 }

app/src/main/java/com/developer/kulloveth/expandablelistsamplewithroom/data/db/CountryDao.kt

@@ -15,5 +15,5 @@ interface CountryDao {
     fun getAlphabetizedWords(): LiveData<List<Countrys>>
 
     @Insert(onConflict = OnConflictStrategy.IGNORE)
-    suspend fun insert(country: Countrys)
+    fun insert(country: Countrys)
 }

app/src/main/java/com/developer/kulloveth/expandablelistsamplewithroom/data/db/PlaceDatabase.kt

@@ -0,0 +1,52 @@
+package com.developer.kulloveth.expandablelistsamplewithroom.data.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.sqlite.db.SupportSQLiteDatabase
+import com.developer.kulloveth.expandablelistsamplewithroom.data.model.Continents
+import com.developer.kulloveth.expandablelistsamplewithroom.data.model.Countrys
+import java.util.concurrent.Executors
+
+@Database(entities = arrayOf(Continents::class, Countrys::class), version = 1, exportSchema = false)
+public abstract class PlaceDatabase : RoomDatabase() {
+
+    abstract fun continentDao(): ContinentDao
+    abstract fun countryDao(): CountryDao
+    private var mContext: Context? = null
+
+    companion object {
+        @Volatile
+        private var INSTANCE: PlaceDatabase? = null
+
+        fun getDatabase(context: Context): PlaceDatabase {
+
+            return INSTANCE ?: synchronized(this) {
+                INSTANCE ?: buildDatabase(context).also {
+                    INSTANCE = it
+                }
+            }
+        }
+
+        private fun buildDatabase(context: Context): PlaceDatabase {
+            return Room.databaseBuilder(context, PlaceDatabase::class.java, "place_db")
+                .addCallback(object : RoomDatabase.Callback() {
+                    override fun onCreate(db: SupportSQLiteDatabase) {
+                        super.onCreate(db)
+
+                        Executors.newSingleThreadExecutor().execute {
+                            INSTANCE?.let {
+
+                                // it.continentDao().insert()
+                            }
+                        }
+
+                    }
+                }).build()
+
+
+        }
+    }
+
+    }