now deleting product together with abstract product

app/src/main/java/org/foxarmy/barcodescannerforemployees/DBStorageController.kt

@@ -137,24 +137,24 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         return DatabaseUtils.longForQuery(db, "SELECT COUNT(*) FROM ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} WHERE ${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?", arrayOf(id.toString())).toInt()
     }
     fun eraseAbstractProduct(db: SQLiteDatabase, id: Int, context: Context) {
-        val projection = arrayOf(
+        val projectionForAbstractProduct = arrayOf(
             AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME
         )
 
-        val selection = "${BaseColumns._ID} = ?"
-        val selectionArgs = arrayOf(id.toString())
-        val cursor = db.query(
+        val selectionForAbstractProduct = "${BaseColumns._ID} = ?"
+        val selectionArgsForAbstractProduct = arrayOf(id.toString())
+        val cursorForAbstractProduct = db.query(
             AbstractProductContract.AbstractProductEntry.TABLE_NAME,
-            projection,
-            selection,
-            selectionArgs,
+            projectionForAbstractProduct,
+            selectionForAbstractProduct,
+            selectionArgsForAbstractProduct,
             null,
             null,
             null
         )
         var imageHash: String = ""
 
-        with (cursor) {
+        with (cursorForAbstractProduct) {
             while(moveToNext()) {
                 val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
                 imageHash = productImageHash
@@ -165,9 +165,26 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
 
         File(picturesDir, "$imageHash.png").delete()
         File(thumbnailsDir, "$imageHash.webp").delete()
+
+        val projectionForProducts = arrayOf(BaseColumns._ID)
+        val selectionForProducts = "${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID} = ?"
+        val selectionArgsForProducts = arrayOf(id.toString())
+
+        val cursorForProducts = db.query(ProductContract.ProductEntry.TABLE_NAME, projectionForProducts, selectionForProducts, selectionArgsForProducts, null, null, null)
+
+        with (cursorForProducts) {
+            while(moveToNext()) {
+                eraseProduct(db, getInt(getColumnIndexOrThrow(BaseColumns._ID)))
+            }
+        }
+
         db.delete(AbstractProductContract.AbstractProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
     }
 
+    fun eraseProduct(db:SQLiteDatabase, id: Int) {
+        db.delete(ProductContract.ProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
+    }
+
     fun insertNewProduct(db: SQLiteDatabase, product: Product) {
         val values = ContentValues().apply {
             put(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID, product.abstractProductId)

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt

@@ -101,9 +101,16 @@ class MainActivity : AppCompatActivity() {
 
                 when (fragment::class.simpleName.toString()) {
                     "StorageFragment" -> {
+                        AlertDialog.Builder(this)
+                            .setMessage("Deleting an abstract product will also delete ALL the products, that belong to it. Do you want to proceed?")
+                            .setPositiveButton("Yes") { _: DialogInterface, _: Int ->
                                 val storageFragment = fragment as StorageFragment
                                 storageFragment.removeSelected()
                             }
+                            .setNegativeButton("No") { _: DialogInterface, _: Int ->
+
+                            }.show()
+                    }
 
                     "CategoriesFragment" -> {
                         AlertDialog.Builder(this)

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/ShelfFragment.kt

@@ -12,6 +12,7 @@ import org.foxarmy.barcodescannerforemployees.ProductContract
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.dataclasses.Product
 import org.foxarmy.barcodescannerforemployees.views.ProductView
+import kotlin.concurrent.thread
 
 class ShelfFragment : Fragment() {
     override fun onCreateView(
@@ -35,8 +36,11 @@ class ShelfFragment : Fragment() {
     }
 
     fun updateContent() {
+        thread {
             val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
+            activity!!.runOnUiThread {
                 grv?.removeAllViews()
+            }
 
             val db = DBStorageController(requireContext()).readableDatabase
             val projection = arrayOf(
@@ -52,9 +56,11 @@ class ShelfFragment : Fragment() {
             with(cursor) {
                 while (moveToNext()) {
                     val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val abstractProductId = getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID))
+                    val abstractProductId =
+                        getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID))
                     val amount = getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.AMOUNT))
-                val dateOfProduction = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.DATE_OF_PRODUCTION))
+                    val dateOfProduction =
+                        getString(getColumnIndexOrThrow(ProductContract.ProductEntry.DATE_OF_PRODUCTION))
                     val dateOfExpiry = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.EXPIRY_DATE))
 
                     val product = Product(productId, abstractProductId, amount, dateOfProduction, dateOfExpiry)
@@ -64,8 +70,11 @@ class ShelfFragment : Fragment() {
                         requireContext(),
                         product
                     )
+                    activity!!.runOnUiThread {
                         grv?.addView(productView)
                     }
                 }
             }
         }
+    }
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/fragments/StorageFragment.kt

@@ -19,6 +19,7 @@ import org.foxarmy.barcodescannerforemployees.activities.AddAbstractProductActiv
 import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
 import org.foxarmy.barcodescannerforemployees.generateThumbnailForImage
 import org.foxarmy.barcodescannerforemployees.views.AbstractProductView
+import kotlin.concurrent.thread
 
 class StorageFragment : Fragment() {
 
@@ -36,12 +37,15 @@ class StorageFragment : Fragment() {
     }
 
     fun removeSelected() {
+        thread {
             val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
 
             val db = DBStorageController(requireContext())
             var deleted = false
             for (view: AbstractProductView in grv?.children!!.iterator() as Iterator<AbstractProductView>) {
+                activity!!.runOnUiThread {
                     view.findViewById<ImageView>(R.id.productPicture).setImageURI(null)
+                }
                 if (view.isProductSelected) {
                     db.eraseAbstractProduct(db.writableDatabase, view.abstractProduct.id, requireContext())
                     deleted = true
@@ -49,10 +53,13 @@ class StorageFragment : Fragment() {
             }
 
             if (!deleted) {
+                activity!!.runOnUiThread {
                     Toast.makeText(requireContext(), "Nothing to delete", Toast.LENGTH_SHORT).show()
                 }
+            }
             updateContent()
         }
+    }
 
     fun updateSelected() {
         val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
@@ -66,16 +73,18 @@ class StorageFragment : Fragment() {
                 ContextCompat.startActivity(requireContext(), addProductIntent, extras)
             }
         }
-
     }
 
     fun updateContent() {
-
+        thread {
             val grv = view?.findViewById<GridLayout>(R.id.contentGridLayout)
+            activity!!.runOnUiThread{
                 grv?.removeAllViews()
+            }
 
             val db = DBStorageController(requireContext()).readableDatabase
-        val projection = arrayOf(BaseColumns._ID,
+            val projection = arrayOf(
+                BaseColumns._ID,
                 AbstractProductContract.AbstractProductEntry.BARCODE,
                 AbstractProductContract.AbstractProductEntry.PRODUCT_NAME,
                 AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT,
@@ -103,10 +112,13 @@ class StorageFragment : Fragment() {
                         requireContext(),
                         product
                     )
+                    activity!!.runOnUiThread{
                         grv?.addView(abstractProduct)
                     }
                 }
             }
+        }
+    }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)

app/src/main/java/org/foxarmy/barcodescannerforemployees/views/ProductView.kt

@@ -68,7 +68,6 @@ class ProductView: LinearLayout {
 
         this.background = ContextCompat.getDrawable(context, if (isProductSelected) R.drawable.outline_selected else R.drawable.outline)
 
-
         findViewById<ConstraintLayout>(R.id.productLayout).setOnLongClickListener {
             isProductSelected = !isProductSelected
             this.background = ContextCompat.getDrawable(context, if (isProductSelected) R.drawable.outline_selected else R.drawable.outline)