some refactor, renaming, started working with product on shelf

app/build.gradle.kts

@@ -46,6 +46,8 @@ dependencies {
     implementation(libs.firebase.crashlytics.buildtools)
     implementation(libs.androidx.gridlayout)
     implementation(libs.androidx.activity)
+    implementation(libs.androidx.legacy.support.v4)
+    implementation(libs.androidx.fragment)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

app/src/main/AndroidManifest.xml

@@ -31,6 +31,10 @@
                 android:name=".activities.AddProductActivity"
                 android:exported="false"
                 android:theme="@style/Theme.BarcodeScannerForEmployees"/>
+        <activity
+                android:name=".activities.AddAbstractProductActivity"
+                android:exported="false"
+                android:theme="@style/Theme.BarcodeScannerForEmployees"/>
         <activity
                 android:name=".activities.FullscreenActivity"
                 android:configChanges="orientation|keyboardHidden|screenSize"
@@ -40,7 +44,7 @@
 
         <provider
                 android:name="androidx.core.content.FileProvider"
-                android:authorities="com.google.firebase.components.activities.MainActivity.provider;com.google.firebase.components.activities.FullscreenActivity.provider;com.google.firebase.components.activities.AddProductActivity.provider"
+                android:authorities="com.google.firebase.components.activities.MainActivity.provider;com.google.firebase.components.activities.FullscreenActivity.provider;com.google.firebase.components.activities.AddAbstractProductActivity.provider"
                 android:exported="false"
                 android:grantUriPermissions="true">
             <meta-data

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

@@ -1,8 +0,0 @@
-package org.foxarmy.barcodescannerforemployees
-
-class Category(
-    public var id: Int,
-    public var name: String,
-) {
-
-}

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

@@ -5,11 +5,12 @@ import android.database.DatabaseUtils
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.provider.BaseColumns
+import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
 import java.io.File
 
-object ProductContract {
+object AbstractProductContract {
-    object ProductEntry : BaseColumns {
+    object AbstractProductEntry : BaseColumns {
-        const val TABLE_NAME = "products"
+        const val TABLE_NAME = "abstract_products"
         const val PRODUCT_NAME = "name"
         const val PRODUCT_NET_WEIGHT = "net_weight"
         const val IMAGE_FILENAME = "image_filename"
@@ -17,14 +18,6 @@ object ProductContract {
     }
 }
 
-object ShelfContract {
-    object ShelfEntry : BaseColumns {
-        const val TABLE_NAME = "shelf"
-        const val PRODUCT_ID = "product_id"
-        const val EXPIRE_DATE = "expire_date"
-    }
-}
-
 object CategoriesContract {
     object CategoryEntry : BaseColumns {
         const val TABLE_NAME = "categories"
@@ -32,19 +25,31 @@ object CategoriesContract {
     }
 }
 
-const val SQL_CREATE_PRODUCT_TABLE =
+object ProductContract {
+    object ProductEntry : BaseColumns {
+        const val TABLE_NAME = "products"
+        const val ABSTRACT_PRODUCT_ID = "abstract_product_id"
+        const val AMOUNT = "amount"
+        const val DATE_OF_PRODUCTION = "date_of_production"
+        const val EXPIRY_DATE = "expiry_date"
+    }
+}
+
+const val SQL_CREATE_ABSTRACT_PRODUCTS_TABLE =
+    "CREATE TABLE ${AbstractProductContract.AbstractProductEntry.TABLE_NAME} (" +
+            "${BaseColumns._ID} INTEGER PRIMARY KEY," +
+            "${AbstractProductContract.AbstractProductEntry.PRODUCT_NAME} TEXT," +
+            "${AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT} REAL," +
+            "${AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME} TEXT," +
+            "${AbstractProductContract.AbstractProductEntry.CATEGORY} INTEGER)"
+
+const val SQL_CREATE_PRODUCTS_TABLE =
     "CREATE TABLE ${ProductContract.ProductEntry.TABLE_NAME} (" +
         "${BaseColumns._ID} INTEGER PRIMARY KEY," +
-            "${ProductContract.ProductEntry.PRODUCT_NAME} TEXT," +
+        "${ProductContract.ProductEntry.ABSTRACT_PRODUCT_ID} INTEGER," +
-            "${ProductContract.ProductEntry.PRODUCT_NET_WEIGHT} REAL," +
+        "${ProductContract.ProductEntry.AMOUNT} INTEGER," +
-            "${ProductContract.ProductEntry.IMAGE_FILENAME} TEXT," +
+        "${ProductContract.ProductEntry.DATE_OF_PRODUCTION} DATE," +
-            "${ProductContract.ProductEntry.CATEGORY} INTEGER)"
+        "${ProductContract.ProductEntry.EXPIRY_DATE} DATE)"
-
-const val SQL_CREATE_SHELF_TABLE =
-    "CREATE TABLE ${ShelfContract.ShelfEntry.TABLE_NAME} (" +
-        "${BaseColumns._ID} INTEGER PRIMARY KEY," +
-        "${ShelfContract.ShelfEntry.PRODUCT_ID} INTEGER," +
-        "${ShelfContract.ShelfEntry.EXPIRE_DATE} DATE)"
 
 const val SQL_CREATE_CATEGORIES_TABLE =
     "CREATE TABLE ${CategoriesContract.CategoryEntry.TABLE_NAME} (" +
@@ -54,8 +59,8 @@ const val SQL_CREATE_CATEGORIES_TABLE =
 class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {
 
     override fun onCreate(db: SQLiteDatabase) {
-        db.execSQL(SQL_CREATE_PRODUCT_TABLE)
+        db.execSQL(SQL_CREATE_ABSTRACT_PRODUCTS_TABLE)
-        db.execSQL(SQL_CREATE_SHELF_TABLE)
+        db.execSQL(SQL_CREATE_PRODUCTS_TABLE)
         db.execSQL(SQL_CREATE_CATEGORIES_TABLE)
     }
 
@@ -96,22 +101,22 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
         var result = mutableListOf<AbstractProduct>()
         val projection = arrayOf(
             BaseColumns._ID,
-            ProductContract.ProductEntry.PRODUCT_NAME,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NAME,
-            ProductContract.ProductEntry.IMAGE_FILENAME,
+            AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME,
-            ProductContract.ProductEntry.PRODUCT_NET_WEIGHT,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT,
         )
 
-        val selection = "${ProductContract.ProductEntry.CATEGORY} = ?"
+        val selection = "${AbstractProductContract.AbstractProductEntry.CATEGORY} = ?"
         val selectionArgs = arrayOf(id.toString())
 
-        val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
+        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, null)
 
         with(cursor) {
             while (moveToNext()) {
                 val abstractProductId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val abstractProductName = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NAME))
+                val abstractProductName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                val abstractProductNetWeight = getDouble(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NET_WEIGHT))
+                val abstractProductNetWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
-                val abstractProductImageHash = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.IMAGE_FILENAME))
+                val abstractProductImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
 
                 val abstractProduct = AbstractProduct(abstractProductId, abstractProductName, abstractProductNetWeight, abstractProductImageHash, category = id)
 
@@ -123,17 +128,17 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
     }
 
     fun getAmountOfAbstractProductsInCategory(db:SQLiteDatabase, id: Int) : Int {
-        return DatabaseUtils.longForQuery(db, "SELECT COUNT(*) FROM ${ProductContract.ProductEntry.TABLE_NAME} WHERE ${ProductContract.ProductEntry.CATEGORY} = ?", arrayOf(id.toString())).toInt()
+        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(
-            ProductContract.ProductEntry.IMAGE_FILENAME
+            AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME
         )
 
         val selection = "${BaseColumns._ID} = ?"
         val selectionArgs = arrayOf(id.toString())
         val cursor = db.query(
-            ProductContract.ProductEntry.TABLE_NAME,
+            AbstractProductContract.AbstractProductEntry.TABLE_NAME,
             projection,
             selection,
             selectionArgs,
@@ -145,7 +150,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
 
         with (cursor) {
             while(moveToNext()) {
-                val productImageHash = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.IMAGE_FILENAME))
+                val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
                 imageHash = productImageHash
             }
         }
@@ -154,7 +159,7 @@ class DBStorageController(context: Context) : SQLiteOpenHelper(context, DATABASE
 
         File(picturesDir, "$imageHash.png").delete()
         File(thumbnailsDir, "$imageHash.webp").delete()
-        db.delete(ProductContract.ProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
+        db.delete(AbstractProductContract.AbstractProductEntry.TABLE_NAME, BaseColumns._ID + "=" + id, null)
     }
 
     companion object {

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

@@ -1,5 +1,7 @@
 package org.foxarmy.barcodescannerforemployees
 
+import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
+
 class Parser constructor(payloadStartRegex: String, payloadEndRegex: String, payloadRegex: String){
     val payloadStartRegex: String = payloadStartRegex
     val payloadEndRegex: String = payloadEndRegex

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

@@ -0,0 +1,194 @@
+package org.foxarmy.barcodescannerforemployees.activities
+
+import android.Manifest
+import android.content.ContentValues
+import android.os.Build
+import android.os.Bundle
+import android.provider.BaseColumns
+import android.util.Log
+import android.widget.*
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.annotation.RequiresApi
+import androidx.appcompat.app.AppCompatActivity
+import com.google.mlkit.vision.barcode.common.Barcode
+import com.google.mlkit.vision.codescanner.GmsBarcodeScannerOptions
+import com.google.mlkit.vision.codescanner.GmsBarcodeScanning
+import org.foxarmy.barcodescannerforemployees.*
+import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
+import java.io.File
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+
+class AddAbstractProductActivity : AppCompatActivity() {
+    private lateinit var imageView: ImageView
+
+    private lateinit var saveButton: Button
+    private lateinit var takePictureButton: Button
+    private lateinit var scanButton: Button
+
+    private lateinit var productNameText: TextView
+    private lateinit var netWeightText: TextView
+
+    private lateinit var categorySpinner: Spinner
+
+    private var abstractProduct: AbstractProduct? = null
+    private lateinit var pictureFile: File
+    private lateinit var picturesPath: File
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        setContentView(R.layout.fragment_add_abstract_product)
+
+        val extras = intent.extras
+        abstractProduct = extras!!.get("abstractProduct") as AbstractProduct?
+
+        picturesPath = File(filesDir, "pictures")
+        val thumbnailsDir = File(cacheDir, "thumbnails")
+        thumbnailsDir.mkdirs()
+        picturesPath.mkdirs()
+        imageView = findViewById(R.id.imageView)
+
+        saveButton = findViewById(R.id.saveButton)
+        takePictureButton = findViewById(R.id.takePictureButton)
+        scanButton = findViewById(R.id.scan_button)
+
+        productNameText = findViewById(R.id.productName)
+        netWeightText = findViewById(R.id.netWeight)
+
+        categorySpinner = findViewById(R.id.categorySpinner)
+
+        fillupCategorySpinner()
+
+        if (abstractProduct != null) {
+            val imageThumbnailUri = getImageUri(this, File(thumbnailsDir, "${abstractProduct!!.imageHash}.webp"))
+            pictureFile = File(picturesPath, "${abstractProduct!!.imageHash}.png]")
+            imageView.setImageURI(imageThumbnailUri)
+            imageView.rotation = 90f
+            productNameText.text = abstractProduct!!.name
+            netWeightText.text = abstractProduct!!.netWeight.toString()
+            categorySpinner.setSelection(abstractProduct!!.category)
+        }
+
+        saveButton.setOnClickListener {
+            val productName = productNameText.text.toString()
+            val netWeight = netWeightText.text
+            if (!this::pictureFile.isInitialized && !pictureFile.exists()) {
+
+                Toast.makeText(this, "Please, make a picture of a product!", Toast.LENGTH_SHORT).show()
+                return@setOnClickListener
+            }
+
+            if (productName == "") {
+                Toast.makeText(this, "Please, write a name of a product!", Toast.LENGTH_SHORT).show()
+                return@setOnClickListener
+            }
+            if (netWeight.toString() == "" || netWeight.toString().toDoubleOrNull() == null) {
+                Toast.makeText(this, "Please, write a valid net weight of a product!", Toast.LENGTH_SHORT).show()
+            }
+
+            val db = DBStorageController(this).writableDatabase
+            val values = ContentValues().apply {
+                put(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME, productName)
+                put(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT, netWeight.toString())
+                put(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME, pictureFile.nameWithoutExtension)
+                put(AbstractProductContract.AbstractProductEntry.CATEGORY, categorySpinner.selectedItemPosition)
+            }
+
+            if (abstractProduct == null) {
+                db.insert(AbstractProductContract.AbstractProductEntry.TABLE_NAME, null, values)
+            } else {
+                db.update(AbstractProductContract.AbstractProductEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(abstractProduct!!.id.toString()))
+            }
+
+            finish()
+        }
+
+        takePictureButton.setOnClickListener {
+            requestPermissionLauncher.launch(Manifest.permission.CAMERA)
+        }
+
+        scanButton.setOnClickListener {
+            val options = GmsBarcodeScannerOptions.Builder()
+                .setBarcodeFormats(
+                    Barcode.FORMAT_EAN_13
+                )
+                .build()
+            val scanner = GmsBarcodeScanning.getClient(this)
+            scanner.startScan()
+                .addOnSuccessListener { barcode ->
+                    productNameText.setText(barcode.rawValue)
+                }
+                .addOnFailureListener { e ->
+                    Toast.makeText(
+                        this,
+                        "Failed to scan barcode. Please, try again or enter data manually",
+                        Toast.LENGTH_LONG
+                    ).show()
+                }
+        }
+    }
+
+    fun fillupCategorySpinner() {
+        val db = DBStorageController(this).readableDatabase
+
+        val categories = mutableListOf("")
+
+        val projection = arrayOf(
+            CategoriesContract.CategoryEntry.CATEGORY_NAME
+        )
+
+        val cursor = db.query(CategoriesContract.CategoryEntry.TABLE_NAME, projection, null, null, null, null, BaseColumns._ID+" ASC")
+
+        with (cursor) {
+            while (moveToNext()) {
+                categories.add(getString(getColumnIndexOrThrow(CategoriesContract.CategoryEntry.CATEGORY_NAME)))
+            }
+        }
+
+        val arrayAdapter = ArrayAdapter<String>(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, categories)
+        arrayAdapter.setDropDownViewResource(androidx.appcompat.R.layout.support_simple_spinner_dropdown_item)
+        categorySpinner.adapter = arrayAdapter
+    }
+
+    @RequiresApi(Build.VERSION_CODES.R)
+    val takePicture = registerForActivityResult(ActivityResultContracts.TakePicture()) { success: Boolean ->
+        if (success) {
+            //Move picture to a proper directory according to its calculated hash
+            val tempfile = File(filesDir, "image.png")
+            val imageContent = tempfile.inputStream().readBytes()
+            val imageHash = imageContent.toString(Charsets.UTF_8).md5()
+
+            pictureFile = File(picturesPath, "$imageHash.png")
+            Files.move(tempfile.toPath(), pictureFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+            tempfile.delete()
+            generateThumbnailForImage(this, imageHash)
+
+            imageView.setImageURI(getImageUri(this, pictureFile))
+        } else {
+            Log.e("QWERTYUIOP", "Cannot save a picture")
+        }
+    }
+
+    @RequiresApi(Build.VERSION_CODES.R)
+    fun getPicture () {
+        //Saving picture to a temp file for further hash calculation and moving to a proper directory
+        val imageFile = File(this.filesDir, "image.png")
+        val imageUri = getImageUri(this, imageFile)
+        if (imageUri != null) {
+            takePicture.launch(imageUri)
+        }
+    }
+
+    @RequiresApi(Build.VERSION_CODES.R)
+    val requestPermissionLauncher =
+        registerForActivityResult(
+            ActivityResultContracts.RequestPermission()
+        ) { isGranted: Boolean ->
+            if (isGranted) {
+                getPicture()
+            } else {
+                Toast.makeText(this, "I need permission in order to take a picture", Toast.LENGTH_LONG).show()
+            }
+        }
+}

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

@@ -7,6 +7,7 @@ import android.provider.BaseColumns
 import android.widget.Button
 import android.widget.EditText
 import org.foxarmy.barcodescannerforemployees.CategoriesContract
+import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 
@@ -17,17 +18,16 @@ class AddCategoryActivity : Activity() {
         setContentView(R.layout.activity_add_category)
 
         val extras = intent.extras
-        val categoryId = extras!!.get("categoryid") as Int?
+        val category = extras!!.get("category") as Category?
-        val categoryName = extras.get("categoryname") as String?
 
         val categoryNameTextEdit: EditText = findViewById(R.id.newCategoryName)
 
-        categoryNameTextEdit.setText(categoryName)
+        categoryNameTextEdit.setText(category!!.name)
 
         findViewById<Button>(R.id.saveButton).setOnClickListener {
             val db = DBStorageController(this).writableDatabase
 
-            if (categoryId == 0) { // Inserting new category
+            if (category.id == 0) { // Inserting new category
                 val values = ContentValues().apply {
                     put(CategoriesContract.CategoryEntry.CATEGORY_NAME, categoryNameTextEdit.text.toString())
                 }
@@ -37,7 +37,7 @@ class AddCategoryActivity : Activity() {
                 val values = ContentValues().apply {
                     put(CategoriesContract.CategoryEntry.CATEGORY_NAME, categoryNameTextEdit.text.toString())
                 }
-                db.update(CategoriesContract.CategoryEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(categoryId.toString()))
+                db.update(CategoriesContract.CategoryEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(category.id.toString()))
             }
 
             finish()

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

@@ -1,200 +1,18 @@
 package org.foxarmy.barcodescannerforemployees.activities
 
-import android.Manifest
-import android.content.ContentValues
-import android.os.Build
 import android.os.Bundle
-import android.provider.BaseColumns
-import android.util.Log
-import android.widget.*
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AppCompatActivity
-import com.google.mlkit.vision.barcode.common.Barcode
+import org.foxarmy.barcodescannerforemployees.R
-import com.google.mlkit.vision.codescanner.GmsBarcodeScannerOptions
+import org.foxarmy.barcodescannerforemployees.dataclasses.Product
-import com.google.mlkit.vision.codescanner.GmsBarcodeScanning
-import org.foxarmy.barcodescannerforemployees.*
-import org.foxarmy.barcodescannerforemployees.databinding.ActivityAddProductBinding
-import java.io.File
-import java.nio.file.Files
-import java.nio.file.StandardCopyOption
 
 class AddProductActivity : AppCompatActivity() {
-    private lateinit var imageView: ImageView
-
-    private lateinit var saveButton: Button
-    private lateinit var takePictureButton: Button
-    private lateinit var scanButton: Button
-
-    private lateinit var productNameText: TextView
-    private lateinit var netWeightText: TextView
-
-    private lateinit var categorySpinner: Spinner
-
-    private var product: AbstractProduct? = null
-    private lateinit var pictureFile: File
-    private lateinit var picturesPath: File
-    private lateinit var binding: ActivityAddProductBinding
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        setContentView(R.layout.fragment_add_product)
+        setContentView(R.layout.activity_add_product)
 
         val extras = intent.extras
-        product = extras!!.get("updatingObject") as AbstractProduct?
+        val product = extras!!.get("product") as Product?
 
-        picturesPath = File(filesDir, "pictures")
-        val thumbnailsDir = File(cacheDir, "thumbnails")
-        thumbnailsDir.mkdirs()
-        picturesPath.mkdirs()
-        imageView = findViewById(R.id.imageView)
-
-        saveButton = findViewById(R.id.saveButton)
-        takePictureButton = findViewById(R.id.takePictureButton)
-        scanButton = findViewById(R.id.scan_button)
-
-        productNameText = findViewById(R.id.productName)
-        netWeightText = findViewById(R.id.netWeight)
-
-        categorySpinner = findViewById(R.id.categorySpinner)
-
-        fillupCategorySpinner()
-
-        if (product != null) {
-            val imageThumbnailUri = getImageUri(this, File(thumbnailsDir, "${product!!.imageHash}.webp"))
-            pictureFile = File(picturesPath, "${product!!.imageHash}.png]")
-            imageView.setImageURI(imageThumbnailUri)
-            imageView.rotation = 90f
-            productNameText.text = product!!.name
-            netWeightText.text = product!!.netWeight.toString()
-            categorySpinner.setSelection(product!!.category)
-        }
-
-        saveButton.setOnClickListener {
-            val productName = productNameText.text.toString()
-            val netWeight = netWeightText.text
-            if (!this::pictureFile.isInitialized && !pictureFile.exists()) {
-
-                Toast.makeText(this, "Please, make a picture of a product!", Toast.LENGTH_SHORT).show()
-                return@setOnClickListener
-            }
-
-            if (productName == "") {
-                Toast.makeText(this, "Please, write a name of a product!", Toast.LENGTH_SHORT).show()
-                return@setOnClickListener
-            }
-            if (netWeight.toString() == "" || netWeight.toString().toDoubleOrNull() == null) {
-                Toast.makeText(this, "Please, write a valid net weight of a product!", Toast.LENGTH_SHORT).show()
-            }
-
-            val db = DBStorageController(this).writableDatabase
-            val values = ContentValues().apply {
-                put(ProductContract.ProductEntry.PRODUCT_NAME, productName)
-                put(ProductContract.ProductEntry.PRODUCT_NET_WEIGHT, netWeight.toString())
-                put(ProductContract.ProductEntry.IMAGE_FILENAME, pictureFile.nameWithoutExtension)
-                put(ProductContract.ProductEntry.CATEGORY, categorySpinner.selectedItemPosition)
-            }
-
-            if (product == null) {
-                db.insert(ProductContract.ProductEntry.TABLE_NAME, null, values)
-            } else {
-                db.update(ProductContract.ProductEntry.TABLE_NAME, values, "${BaseColumns._ID} = ?", arrayOf(product!!.id.toString()))
-            }
-
-            finish()
-        }
-
-        takePictureButton.setOnClickListener {
-            requestPermissionLauncher.launch(Manifest.permission.CAMERA)
-        }
-
-        scanButton.setOnClickListener {
-            val options = GmsBarcodeScannerOptions.Builder()
-                .setBarcodeFormats(
-                    Barcode.FORMAT_EAN_13
-                )
-                .build()
-            val scanner = GmsBarcodeScanning.getClient(this)
-            scanner.startScan()
-                .addOnSuccessListener { barcode ->
-                    productNameText.setText(barcode.rawValue)
-                }
-                .addOnFailureListener { e ->
-                    Toast.makeText(
-                        this,
-                        "Failed to scan barcode. Please, try again or enter data manually",
-                        Toast.LENGTH_LONG
-                    ).show()
-                }
-        }
-
-//        binding = ActivityAddProductBinding.inflate(layoutInflater)
-
-//        setContentView(binding.root)
-
-    }
-
-    fun fillupCategorySpinner() {
-        val db = DBStorageController(this).readableDatabase
-
-        val categories = mutableListOf("")
-
-        val projection = arrayOf(
-            CategoriesContract.CategoryEntry.CATEGORY_NAME
-        )
-
-        val cursor = db.query(CategoriesContract.CategoryEntry.TABLE_NAME, projection, null, null, null, null, BaseColumns._ID+" ASC")
-
-        with (cursor) {
-            while (moveToNext()) {
-                categories.add(getString(getColumnIndexOrThrow(CategoriesContract.CategoryEntry.CATEGORY_NAME)))
-            }
-        }
-
-        val arrayAdapter = ArrayAdapter<String>(this, androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, categories)
-        arrayAdapter.setDropDownViewResource(androidx.appcompat.R.layout.support_simple_spinner_dropdown_item)
-        categorySpinner.adapter = arrayAdapter
-    }
-
-    @RequiresApi(Build.VERSION_CODES.R)
-    val takePicture = registerForActivityResult(ActivityResultContracts.TakePicture()) { success: Boolean ->
-        if (success) {
-            //Move picture to a proper directory according to its calculated hash
-            val tempfile = File(filesDir, "image.png")
-            val imageContent = tempfile.inputStream().readBytes()
-            val imageHash = imageContent.toString(Charsets.UTF_8).md5()
-
-            pictureFile = File(picturesPath, "$imageHash.png")
-            Files.move(tempfile.toPath(), pictureFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
-            tempfile.delete()
-            generateThumbnailForImage(this, imageHash)
-
-            imageView.setImageURI(getImageUri(this, pictureFile))
-        } else {
-            Log.e("QWERTYUIOP", "Cannot save a picture")
-        }
-    }
-
-    @RequiresApi(Build.VERSION_CODES.R)
-    fun getPicture () {
-        //Saving picture to a temp file for further hash calculation and moving to a proper directory
-        val imageFile = File(this.filesDir, "image.png")
-        val imageUri = getImageUri(this, imageFile)
-        if (imageUri != null) {
-            takePicture.launch(imageUri)
-        }
-    }
-
-    @RequiresApi(Build.VERSION_CODES.R)
-    val requestPermissionLauncher =
-        registerForActivityResult(
-            ActivityResultContracts.RequestPermission()
-        ) { isGranted: Boolean ->
-            if (isGranted) {
-                getPicture()
-            } else {
-                Toast.makeText(this, "I need permission in order to take a picture", Toast.LENGTH_LONG).show()
-            }
     }
 }

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

@@ -12,7 +12,9 @@ import androidx.viewpager.widget.ViewPager
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.ViewPagerAdapter
 import org.foxarmy.barcodescannerforemployees.databinding.ActivityMainBinding
+import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.fragments.CategoriesFragment
+import org.foxarmy.barcodescannerforemployees.fragments.ShelfFragment
 import org.foxarmy.barcodescannerforemployees.fragments.StorageFragment
 
 class MainActivity : AppCompatActivity() {
@@ -36,25 +38,34 @@ class MainActivity : AppCompatActivity() {
 
             when (fragment::class.simpleName.toString()) {
                 "StorageFragment" -> {
-                    val addProductIntent = Intent(this, AddProductActivity::class.java)
+                    val addAbstractProductIntent = Intent(this, AddAbstractProductActivity::class.java)
                     val extras = Bundle()
                     // I reuse the same stuff for editing and adding new product.
-                    // if updatingObject == null, it means that we need to create new object
+                    // if abstractProduct == null, it means that we need to create new object
-                    extras.putParcelable("updatingObject", null)
+                    extras.putParcelable("abstractProduct", null)
-                    addProductIntent.putExtras(extras)
+                    addAbstractProductIntent.putExtras(extras)
-                    ContextCompat.startActivity(this, addProductIntent, extras)
+                    ContextCompat.startActivity(this, addAbstractProductIntent, extras)
                 }
 
                 "CategoriesFragment" -> {
                     val addCategoryIntent = Intent(this, AddCategoryActivity::class.java)
                     val extras = Bundle()
-                    extras.putInt("categoryid", 0)
+                    //TODO: Implement parcellable for Category class to simplify this
-                    extras.putString("categoryname", "New category")
+//                    extras.putInt("categoryid", 0)
+//                    extras.putString("categoryname", "New category")
+                    extras.putParcelable("category", Category(0, "New category"))
                     addCategoryIntent.putExtras(extras)
                     ContextCompat.startActivity(this, addCategoryIntent, extras)
                 }
-            }
 
+                "ShelfFragment" -> {
+                    val addProductIntent = Intent(this, AddProductActivity::class.java)
+                    val extras = Bundle()
+                    extras.putParcelable("product", null)
+                    addProductIntent.putExtras(extras)
+                    ContextCompat.startActivity(this, addProductIntent, extras)
+                }
+            }
         }
     }
 
@@ -63,7 +74,8 @@ class MainActivity : AppCompatActivity() {
 
         adapter.addFragment(CategoriesFragment(), "Categories")
         adapter.addFragment(StorageFragment(), "Storage")
-        //TODO: shelf and settings fragments
+        adapter.addFragment(ShelfFragment(), "Shelf")
+        //TODO: settings fragments
 
         // setting adapter to view pager.
         viewpager.setAdapter(adapter)

app/src/main/java/org/foxarmy/barcodescannerforemployees/dataclasses/AbstractProduct.kt

@@ -1,4 +1,4 @@
-package org.foxarmy.barcodescannerforemployees
+package org.foxarmy.barcodescannerforemployees.dataclasses
 
 import android.os.Parcel
 import android.os.Parcelable

app/src/main/java/org/foxarmy/barcodescannerforemployees/dataclasses/Category.kt

@@ -0,0 +1,39 @@
+package org.foxarmy.barcodescannerforemployees.dataclasses
+
+import android.os.Parcel
+import android.os.Parcelable
+
+class Category() : Parcelable {
+    var id = 0
+    var name = ""
+
+
+    constructor(id: Int, name: String) : this() {
+        this.id = id
+        this.name = name
+    }
+
+    constructor(parcel: Parcel) : this() {
+        id = parcel.readInt()
+        name = parcel.readString()!!
+    }
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) {
+        parcel.writeInt(id)
+        parcel.writeString(name)
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    companion object CREATOR : Parcelable.Creator<Category> {
+        override fun createFromParcel(parcel: Parcel): Category {
+            return Category(parcel)
+        }
+
+        override fun newArray(size: Int): Array<Category?> {
+            return arrayOfNulls(size)
+        }
+    }
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/dataclasses/Product.kt

@@ -0,0 +1,40 @@
+package org.foxarmy.barcodescannerforemployees.dataclasses
+
+import android.os.Parcel
+import android.os.Parcelable
+
+class Product() : Parcelable {
+    var abstractProductId = 0
+    var amount = 0
+
+
+    constructor(abstractProductId: Int, amount: Int) : this() {
+        this.abstractProductId = abstractProductId
+        this.amount = amount
+    }
+
+    constructor(parcel: Parcel) : this() {
+        abstractProductId = parcel.readInt()
+        amount = parcel.readInt()
+    }
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) {
+        parcel.writeInt(abstractProductId)
+        parcel.writeInt(amount)
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    companion object CREATOR : Parcelable.Creator<Product> {
+        override fun createFromParcel(parcel: Parcel): Product {
+            return Product(parcel)
+        }
+
+        override fun newArray(size: Int): Array<Product?> {
+            return arrayOfNulls(size)
+        }
+    }
+
+}

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

@@ -0,0 +1,21 @@
+package org.foxarmy.barcodescannerforemployees.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import org.foxarmy.barcodescannerforemployees.R
+import org.foxarmy.barcodescannerforemployees.databinding.FragmentAddAbstractProductBinding
+
+class AddAbstractProductFragment : Fragment() {
+    private lateinit var binding: FragmentAddAbstractProductBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        binding = FragmentAddAbstractProductBinding.inflate(layoutInflater)
+        return inflater.inflate(R.layout.fragment_add_abstract_product, container, false)
+    }
+}

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

@@ -12,7 +12,7 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.children
 import androidx.fragment.app.Fragment
 import org.foxarmy.barcodescannerforemployees.CategoriesContract
-import org.foxarmy.barcodescannerforemployees.Category
+import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.AddCategoryActivity
@@ -56,8 +56,7 @@ class CategoriesFragment : Fragment() {
             if (view.isCategorySelected) {
                 val addCategoryIntent = Intent(context, AddCategoryActivity::class.java)
                 val extras = Bundle()
-                extras.putInt("categoryid", view.category.id)
+                extras.putParcelable("category", view.category)
-                extras.putString("categoryname", view.category.name)
                 addCategoryIntent.putExtras(extras)
                 ContextCompat.startActivity(context!!, addCategoryIntent, extras)
             }

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

@@ -0,0 +1,17 @@
+package org.foxarmy.barcodescannerforemployees.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import org.foxarmy.barcodescannerforemployees.R
+
+class ShelfFragment : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_shelf, container, false)
+    }
+}

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

@@ -12,8 +12,12 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.children
 import androidx.fragment.app.Fragment
 import androidx.gridlayout.widget.GridLayout
-import org.foxarmy.barcodescannerforemployees.*
+import org.foxarmy.barcodescannerforemployees.AbstractProductContract
-import org.foxarmy.barcodescannerforemployees.activities.AddProductActivity
+import org.foxarmy.barcodescannerforemployees.DBStorageController
+import org.foxarmy.barcodescannerforemployees.R
+import org.foxarmy.barcodescannerforemployees.activities.AddAbstractProductActivity
+import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
+import org.foxarmy.barcodescannerforemployees.generateThumbnailForImage
 import org.foxarmy.barcodescannerforemployees.views.AbstractProductView
 
 class StorageFragment : Fragment() {
@@ -39,7 +43,7 @@ class StorageFragment : Fragment() {
         for (view: AbstractProductView in grv?.children!!.iterator() as Iterator<AbstractProductView>) {
             view.findViewById<ImageView>(R.id.productPicture).setImageURI(null)
             if (view.isProductSelected) {
-                db.eraseAbstractProduct(db.writableDatabase, view.product.id, requireContext())
+                db.eraseAbstractProduct(db.writableDatabase, view.abstractProduct.id, requireContext())
                 deleted = true
             }
         }
@@ -55,9 +59,9 @@ class StorageFragment : Fragment() {
 
         for (view: AbstractProductView in grv?.children!!.iterator() as Iterator<AbstractProductView>) {
             if (view.isProductSelected) {
-                val addProductIntent = Intent(requireContext(), AddProductActivity::class.java)
+                val addProductIntent = Intent(requireContext(), AddAbstractProductActivity::class.java)
                 val extras = Bundle()
-                extras.putParcelable("updatingObject", view.product)
+                extras.putParcelable("abstractProduct", view.abstractProduct)
                 addProductIntent.putExtras(extras)
                 ContextCompat.startActivity(requireContext(), addProductIntent, extras)
             }
@@ -72,21 +76,21 @@ class StorageFragment : Fragment() {
 
         val db = DBStorageController(requireContext()).readableDatabase
         val projection = arrayOf(BaseColumns._ID,
-            ProductContract.ProductEntry.PRODUCT_NAME,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NAME,
-            ProductContract.ProductEntry.PRODUCT_NET_WEIGHT,
+            AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT,
-            ProductContract.ProductEntry.IMAGE_FILENAME,
+            AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME,
-            ProductContract.ProductEntry.CATEGORY
+            AbstractProductContract.AbstractProductEntry.CATEGORY
         )
 
-        val cursor = db.query(ProductContract.ProductEntry.TABLE_NAME, projection, null, null, null, null, null)
+        val cursor = db.query(AbstractProductContract.AbstractProductEntry.TABLE_NAME, projection, null, null, null, null, null)
 
         with (cursor) {
             while(moveToNext()) {
                 val productId = getInt(getColumnIndexOrThrow(BaseColumns._ID))
-                val productName = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NAME))
+                val productName = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NAME))
-                val netWeight = getDouble(getColumnIndexOrThrow(ProductContract.ProductEntry.PRODUCT_NET_WEIGHT))
+                val netWeight = getDouble(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.PRODUCT_NET_WEIGHT))
-                val productImageHash = getString(getColumnIndexOrThrow(ProductContract.ProductEntry.IMAGE_FILENAME))
+                val productImageHash = getString(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.IMAGE_FILENAME))
-                val category = getInt(getColumnIndexOrThrow(ProductContract.ProductEntry.CATEGORY))
+                val category = getInt(getColumnIndexOrThrow(AbstractProductContract.AbstractProductEntry.CATEGORY))
 
                 val product = AbstractProduct(productId, productName, netWeight, productImageHash, category)
 

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

@@ -11,7 +11,7 @@ import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.content.ContextCompat
 import androidx.core.content.ContextCompat.startActivity
-import org.foxarmy.barcodescannerforemployees.AbstractProduct
+import org.foxarmy.barcodescannerforemployees.dataclasses.AbstractProduct
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.activities.FullscreenActivity
@@ -25,12 +25,12 @@ class AbstractProductView: LinearLayout {
     private var netWeightField: TextView
     private var categoryField: TextView
     private var unitField: TextView
-    var product: AbstractProduct
+    var abstractProduct: AbstractProduct
     var isProductSelected = false
 
-    constructor(activity: Activity, context: Context, product: AbstractProduct) : super(context) {
+    constructor(activity: Activity, context: Context, abstractProduct: AbstractProduct) : super(context) {
 
-        this.product = product
+        this.abstractProduct = abstractProduct
 
         val inflater:LayoutInflater = activity.layoutInflater
         inflater.inflate(R.layout.abstract_product_view, this)
@@ -44,13 +44,13 @@ class AbstractProductView: LinearLayout {
 
         val thumbnailsDir = File(context.cacheDir, "thumbnails")
         thumbnailsDir.mkdirs()
-        val imageUri = getImageUri(activity, File(thumbnailsDir, "${product.imageHash}.webp"))
+        val imageUri = getImageUri(activity, File(thumbnailsDir, "${abstractProduct.imageHash}.webp"))
         productPicture.setImageURI(imageUri)
         productPicture.rotation = 90f
         productPicture.setOnClickListener {
             val fullscreenIntent = Intent(activity, FullscreenActivity::class.java)
             val extras = Bundle()
-            extras.putString("imagehash", product.imageHash)
+            extras.putString("imagehash", abstractProduct.imageHash)
             fullscreenIntent.putExtras(extras)
             startActivity(context, fullscreenIntent, extras)
         }
@@ -61,9 +61,9 @@ class AbstractProductView: LinearLayout {
 
 
 
-        productNameField.text = product.name
+        productNameField.text = abstractProduct.name
-        netWeightField.text = product.netWeight.toString()
+        netWeightField.text = abstractProduct.netWeight.toString()
-        categoryField.text = DBStorageController(context).getCategoryNameById(DBStorageController(context).readableDatabase, product.category)
+        categoryField.text = DBStorageController(context).getCategoryNameById(DBStorageController(context).readableDatabase, abstractProduct.category)
 
         //TODO: units
 

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

@@ -6,7 +6,7 @@ import android.view.LayoutInflater
 import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.core.content.ContextCompat
-import org.foxarmy.barcodescannerforemployees.Category
+import org.foxarmy.barcodescannerforemployees.dataclasses.Category
 import org.foxarmy.barcodescannerforemployees.DBStorageController
 import org.foxarmy.barcodescannerforemployees.R
 

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

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.core.widget.NestedScrollView
+        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=".fragments.AddAbstractProductFragment">
+    <include layout="@layout/content_add_abstract_product" android:id="@+id/include_content"/>
+</androidx.core.widget.NestedScrollView>

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

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior" android:id="@+id/addAbstractProductLayout">
+
+        <androidx.fragment.app.FragmentContainerView
+                android:name="androidx.navigation.fragment.NavHostFragment"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" app:navGraph="@navigation/nav_graph_add_abstract_product"
+                app:defaultNavHost="true" android:id="@+id/fragmentContainerView"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.core.widget.NestedScrollView
+        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=".fragments.AddAbstractProductFragment">
+    <androidx.constraintlayout.widget.ConstraintLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:padding="16dp">
+        <Button
+                android:id="@+id/scan_button"
+                android:layout_width="100dp"
+                android:layout_height="50dp"
+                android:text="@string/scan_label"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
+                android:layout_marginTop="15dp"/>
+        <ImageView
+                android:src="@android:drawable/ic_menu_camera"
+                android:layout_width="356dp"
+                android:layout_height="303dp" android:id="@+id/imageView"
+                android:layout_marginBottom="25dp"
+                app:layout_constraintBottom_toTopOf="@+id/productName" app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="parent"
+                android:layout_marginTop="15dp"/>
+        <EditText
+                android:layout_width="350dp"
+                android:layout_height="50dp"
+                android:inputType="text"
+                android:ems="10"
+                android:id="@+id/productName"
+                app:layout_constraintStart_toStartOf="parent"
+                android:layout_marginStart="8dp" android:layout_marginEnd="8dp"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintBottom_toTopOf="@+id/netWeight"
+                app:layout_constraintHorizontal_bias="0.5"
+                android:visibility="visible" android:hint="@string/product_name_label" android:textColorHint="#737373"
+                app:layout_constraintTop_toBottomOf="@+id/imageView"/>
+        <EditText
+                android:layout_width="350dp"
+                android:layout_height="50dp"
+                android:inputType="text"
+                android:ems="10"
+                android:id="@+id/netWeight"
+                app:layout_constraintStart_toStartOf="parent"
+                android:layout_marginStart="8dp"
+                android:layout_marginEnd="8dp"
+                app:layout_constraintEnd_toEndOf="parent"
+                android:visibility="visible" android:hint="@string/netWeight" android:textColorHint="#737373"
+                app:layout_constraintTop_toBottomOf="@+id/productName"/>
+        <TextView
+                android:text="@string/category"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content" android:id="@+id/categoryTextView"
+                app:layout_constraintTop_toBottomOf="@+id/netWeight"
+                android:layout_marginTop="20dp" app:layout_constraintStart_toStartOf="parent"
+                android:layout_marginStart="8dp"/>
+        <Spinner
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" android:id="@+id/categorySpinner"
+                app:layout_constraintStart_toEndOf="@+id/categoryTextView"
+                app:layout_constraintTop_toBottomOf="@+id/netWeight" android:layout_marginStart="8dp"
+                android:layout_marginTop="20dp"/>
+        <Button
+                android:text="@string/saveButton"
+                android:layout_width="100dp"
+                android:layout_height="50dp" android:id="@+id/saveButton"
+                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
+                android:layout_marginTop="15dp" app:layout_constraintEnd_toEndOf="parent"/>
+        <Button
+                android:text="@string/takePicture"
+                android:layout_width="100dp"
+                android:layout_height="55dp" android:id="@+id/takePictureButton"
+                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
+                android:layout_marginTop="15dp" app:layout_constraintStart_toEndOf="@+id/scan_button"
+                android:layout_marginStart="33dp" app:layout_constraintEnd_toStartOf="@+id/saveButton"
+                android:layout_marginEnd="6dp" app:layout_constraintHorizontal_bias="0.0"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.core.widget.NestedScrollView>

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

@@ -10,74 +10,11 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:padding="16dp">
-        <Button
-                android:id="@+id/scan_button"
-                android:layout_width="100dp"
-                android:layout_height="50dp"
-                android:text="@string/scan_label"
-                app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
-                android:layout_marginTop="15dp"/>
-        <ImageView
-                android:src="@android:drawable/ic_menu_camera"
-                android:layout_width="356dp"
-                android:layout_height="303dp" android:id="@+id/imageView"
-                android:layout_marginBottom="25dp"
-                app:layout_constraintBottom_toTopOf="@+id/productName" app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="parent"
-                android:layout_marginTop="15dp"/>
-        <EditText
-                android:layout_width="350dp"
-                android:layout_height="50dp"
-                android:inputType="text"
-                android:ems="10"
-                android:id="@+id/productName"
-                app:layout_constraintStart_toStartOf="parent"
-                android:layout_marginStart="8dp" android:layout_marginEnd="8dp"
-                app:layout_constraintEnd_toEndOf="parent"
-                app:layout_constraintBottom_toTopOf="@+id/netWeight"
-                app:layout_constraintHorizontal_bias="0.5"
-                android:visibility="visible" android:hint="@string/product_name_label" android:textColorHint="#737373"
-                app:layout_constraintTop_toBottomOf="@+id/imageView"/>
-        <EditText
-                android:layout_width="350dp"
-                android:layout_height="50dp"
-                android:inputType="text"
-                android:ems="10"
-                android:id="@+id/netWeight"
-                app:layout_constraintStart_toStartOf="parent"
-                android:layout_marginStart="8dp"
-                android:layout_marginEnd="8dp"
-                app:layout_constraintEnd_toEndOf="parent"
-                android:visibility="visible" android:hint="@string/netWeight" android:textColorHint="#737373"
-                app:layout_constraintTop_toBottomOf="@+id/productName"/>
-        <TextView
-                android:text="@string/category"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content" android:id="@+id/categoryTextView"
-                app:layout_constraintTop_toBottomOf="@+id/netWeight"
-                android:layout_marginTop="20dp" app:layout_constraintStart_toStartOf="parent"
-                android:layout_marginStart="8dp"/>
         <Spinner
-                android:layout_width="match_parent"
+            android:layout_width="400dp"
-                android:layout_height="wrap_content" android:id="@+id/categorySpinner"
+            android:layout_height="50dp" android:id="@+id/abstractProductSelect"
-                app:layout_constraintStart_toEndOf="@+id/categoryTextView"
+            app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="12dp"
-                app:layout_constraintTop_toBottomOf="@+id/netWeight" android:layout_marginStart="8dp"
+            app:layout_constraintStart_toStartOf="parent"
-                android:layout_marginTop="20dp"/>
+            app:layout_constraintEnd_toEndOf="parent"/>
-        <Button
-                android:text="@string/saveButton"
-                android:layout_width="100dp"
-                android:layout_height="50dp" android:id="@+id/saveButton"
-                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
-                android:layout_marginTop="15dp" app:layout_constraintEnd_toEndOf="parent"/>
-        <Button
-                android:text="@string/takePicture"
-                android:layout_width="100dp"
-                android:layout_height="55dp" android:id="@+id/takePictureButton"
-                app:layout_constraintTop_toBottomOf="@+id/categoryTextView"
-                android:layout_marginTop="15dp" app:layout_constraintStart_toEndOf="@+id/scan_button"
-                android:layout_marginStart="33dp" app:layout_constraintEnd_toStartOf="@+id/saveButton"
-                android:layout_marginEnd="6dp" app:layout_constraintHorizontal_bias="0.0"/>
-
     </androidx.constraintlayout.widget.ConstraintLayout>
 </androidx.core.widget.NestedScrollView>

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent">
+
+</FrameLayout>

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+</LinearLayout>

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation 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/nav_graph_add_abstract_product"
+            app:startDestination="@id/addAbstractProductFragment">
+
+    <fragment android:id="@+id/addAbstractProductFragment"
+              android:name="org.foxarmy.barcodescannerforemployees.fragments.AddAbstractProductFragment"
+              android:label="activity_add_abstract_product" tools:layout="@layout/fragment_add_abstract_product"/>
+</navigation>

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

@@ -5,6 +5,7 @@
             android:id="@+id/nav_graph_add_product"
             app:startDestination="@id/addProductFragment">
 
-    <fragment android:id="@+id/addProductFragment" android:name="org.foxarmy.barcodescannerforemployees.fragments.AddProductFragment"
+    <fragment android:id="@+id/addProductFragment"
-              android:label="add_product_fragment" tools:layout="@layout/fragment_add_product"/>
+              android:name="org.foxarmy.barcodescannerforemployees.fragments.AddProductFragment"
+              android:label="activity_add_product" tools:layout="@layout/fragment_add_product"/>
 </navigation>

gradle/libs.versions.toml

@@ -15,6 +15,8 @@ navigationUiKtx = "2.8.0"
 firebaseCrashlyticsBuildtools = "3.0.2"
 gridlayout = "1.0.0"
 activity = "1.9.2"
+legacySupportV4 = "1.0.0"
+fragment = "1.8.4"
 
 [libraries]
 androidx-camera-view = { module = "androidx.camera:camera-view", version.ref = "cameraView" }
@@ -31,6 +33,8 @@ androidx-navigation-ui-ktx = { group = "androidx.navigation", name = "navigation
 firebase-crashlytics-buildtools = { group = "com.google.firebase", name = "firebase-crashlytics-buildtools", version.ref = "firebaseCrashlyticsBuildtools" }
 androidx-gridlayout = { group = "androidx.gridlayout", name = "gridlayout", version.ref = "gridlayout" }
 androidx-activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
+androidx-legacy-support-v4 = { group = "androidx.legacy", name = "legacy-support-v4", version.ref = "legacySupportV4" }
+androidx-fragment = { group = "androidx.fragment", name = "fragment", version.ref = "fragment" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }