Added MyItemKeyProvider and moved submit layout to a separate xml file

.idea/misc.xml

@@ -35,7 +35,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/java/com/paktalin/vocabularynotebook/ui/activities/MainActivity.kt

@@ -11,10 +11,10 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
 import androidx.recyclerview.selection.SelectionPredicates
 import androidx.recyclerview.selection.SelectionTracker
-import androidx.recyclerview.selection.StableIdKeyProvider
 import androidx.recyclerview.selection.StorageStrategy
 import com.paktalin.vocabularynotebook.R
 import com.paktalin.vocabularynotebook.ui.recycler_view.MyItemDetailsLookup
+import com.paktalin.vocabularynotebook.ui.recycler_view.MyItemKeyProvider
 import com.paktalin.vocabularynotebook.ui.recycler_view.VocabularyAdapter
 import com.paktalin.vocabularynotebook.ui.views.LockableLayoutManager
 import com.paktalin.vocabularynotebook.utils.*
@@ -33,6 +33,7 @@ class MainActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         FirestoreManager.vocabularyId = getSavedVocabularyIdFromPreferences(this@MainActivity)
+        recyclerView.adapter = VocabularyAdapter(VocabSet(mutableListOf()), this@MainActivity)
         setUpSwipeRefresh()
         setUpNavigationView()
         hideKeyboard()
@@ -85,6 +86,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun setUpVocabularyAdapter() {
+
         addProgressBar(supportFragmentManager, R.id.container_main)
         FirestoreManager().extractVocabularyId({
             recyclerView.layoutManager = LockableLayoutManager(this@MainActivity)
@@ -123,7 +125,7 @@ class MainActivity : AppCompatActivity() {
         tracker = SelectionTracker.Builder<Long>(
                 "mySelection",
                 recyclerView,
-                StableIdKeyProvider(recyclerView),
+                MyItemKeyProvider(recyclerView),
                 MyItemDetailsLookup(recyclerView),
                 StorageStrategy.createLongStorage()
         ).withSelectionPredicate(

app/src/main/java/com/paktalin/vocabularynotebook/ui/fragments/AddWordFragment.kt

@@ -4,9 +4,11 @@ import android.os.Bundle
 import android.text.Editable
 import android.text.TextWatcher
 import com.paktalin.vocabularynotebook.firestoreitems.WordPojo
-import com.paktalin.vocabularynotebook.utils.*
-import kotlinx.android.synthetic.main.content_main.*
+import com.paktalin.vocabularynotebook.utils.gone
+import com.paktalin.vocabularynotebook.utils.invisible
+import com.paktalin.vocabularynotebook.utils.visible
 import kotlinx.android.synthetic.main.fragment_editable_word.*
+import kotlinx.android.synthetic.main.submit.*
 
 class AddWordFragment : WordFragment() {
     private var wordEmpty: Boolean = true

app/src/main/java/com/paktalin/vocabularynotebook/ui/fragments/EditWordFragment.kt

@@ -13,6 +13,7 @@ import com.paktalin.vocabularynotebook.utils.removeFragment
 import com.paktalin.vocabularynotebook.utils.visible
 import kotlinx.android.synthetic.main.content_main.*
 import kotlinx.android.synthetic.main.fragment_editable_word.*
+import kotlinx.android.synthetic.main.submit.*
 import kotlinx.android.synthetic.main.word_item.view.*
 
 class EditWordFragment : WordFragment() {

app/src/main/java/com/paktalin/vocabularynotebook/ui/fragments/WordFragment.kt

 package com.paktalin.vocabularynotebook.ui.fragments
 
 import android.os.Bundle
-import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.fragment.app.Fragment
 import com.paktalin.vocabularynotebook.R
 import com.paktalin.vocabularynotebook.ui.activities.MainActivity
-import com.paktalin.vocabularynotebook.utils.FirestoreManager
 import com.paktalin.vocabularynotebook.utils.gone
 import kotlinx.android.synthetic.main.fragment_editable_word.*
-import kotlinx.android.synthetic.main.content_main.*
+import kotlinx.android.synthetic.main.submit.*
 
 abstract class WordFragment : Fragment() {
     protected lateinit var mainActivity: MainActivity

app/src/main/java/com/paktalin/vocabularynotebook/ui/recycler_view/MyItemKeyProvider.kt

+package com.paktalin.vocabularynotebook.ui.recycler_view
+
+import androidx.recyclerview.selection.ItemKeyProvider
+import androidx.recyclerview.widget.RecyclerView
+
+class MyItemKeyProvider(private val recyclerView: RecyclerView) : ItemKeyProvider<Long>(ItemKeyProvider.SCOPE_MAPPED) {
+
+    override fun getKey(position: Int): Long? {
+        return recyclerView.adapter?.getItemId(position)
+    }
+
+    override fun getPosition(key: Long): Int {
+        val viewHolder = recyclerView.findViewHolderForItemId(key)
+        return viewHolder?.layoutPosition ?: RecyclerView.NO_POSITION
+    }
+}
\ No newline at end of file

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

 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<RelativeLayout 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">
 
@@ -43,39 +41,6 @@
         </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
     </LinearLayout>
 
-    <LinearLayout
-        android:id="@+id/btnSubmitLayout"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="@color/colorPrimary"
-        android:orientation="horizontal"
-        android:visibility="gone"
-        android:layout_alignParentBottom="true">
-
-        <ImageButton
-            android:id="@+id/btnCancel"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
-            android:layout_margin="@dimen/small_margin"
-            android:background="@android:color/transparent"
-            app:srcCompat="@drawable/ic_close_brown"
-            tools:ignore="ContentDescription" />
-
-        <View
-            android:layout_width="0dp"
-            android:layout_height="0dp"
-            android:layout_weight="1" />
-
-        <ImageButton
-            android:id="@+id/btnSubmit"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
-            android:layout_margin="@dimen/small_margin"
-            android:background="@android:color/transparent"
-            app:srcCompat="@drawable/ic_done_brown"
-            tools:ignore="ContentDescription" />
-    </LinearLayout>
+    <include layout="@layout/submit" />
 
 </RelativeLayout>
\ No newline at end of file

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

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout 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/btnSubmitLayout"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_alignParentBottom="true"
+    android:background="@color/colorPrimary"
+    android:orientation="horizontal"
+    android:visibility="gone">
+
+    <ImageButton
+        android:id="@+id/btnCancel"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:layout_margin="@dimen/small_margin"
+        android:background="@android:color/transparent"
+        app:srcCompat="@drawable/ic_close_brown"
+        tools:ignore="ContentDescription" />
+
+    <View
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_weight="1" />
+
+    <ImageButton
+        android:id="@+id/btnSubmit"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:layout_margin="@dimen/small_margin"
+        android:background="@android:color/transparent"
+        app:srcCompat="@drawable/ic_done_brown"
+        tools:ignore="ContentDescription" />
+</LinearLayout>
\ No newline at end of file

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

@@ -6,18 +6,17 @@
     android:background="@color/colorPrimary"
     android:orientation="vertical">
 
-    <Spinner
-        android:id="@+id/spinner2"
-        android:layout_width="match_parent"
+    <AutoCompleteTextView
+        android:id="@+id/brand"
+        android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:layout_marginStart="8dp"
         android:layout_marginLeft="8dp"
         android:layout_marginTop="8dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
         android:layout_marginBottom="8dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
+        android:hint="@string/enter_tag"
         app:layout_constraintTop_toTopOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/values/strings.xml

@@ -22,4 +22,5 @@
     <string name="toast_enter_username_password">Please, enter username and password</string>
     <string name="toast_invalid_username">Please, create a username using letters a–z, numbers 0–9 and characters -_.</string>
     <string name="toast_select_words_to_tag">Select words to tag</string>
+    <string name="enter_tag">Enter tag</string>
 </resources>