introduced TagFragment

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

@@ -19,7 +19,6 @@ import com.paktalin.vocabularynotebook.vocabulary.Sort
 import com.paktalin.vocabularynotebook.vocabulary.VocabSet
 import kotlinx.android.synthetic.main.activity_main.*
 import kotlinx.android.synthetic.main.content_main.*
-import kotlinx.android.synthetic.main.tag.*
 
 class MainActivity : AppCompatActivity() {
 
@@ -129,10 +128,10 @@ class MainActivity : AppCompatActivity() {
         if (!selection.isEmpty) {
             vocabularyAdapter.showPopupMenu = false
             Log.d(TAG, "selection ${selection.toList()}")
-            visible(tagLayout)
+            addTagFragment(supportFragmentManager, R.id.main_activity_container)
         } else {
             vocabularyAdapter.showPopupMenu = true
-            gone(tagLayout)
+            removeTagFragment(supportFragmentManager)
         }
     }
 

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

+package com.paktalin.vocabularynotebook.ui.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.paktalin.vocabularynotebook.R
+
+class TagFragment : Fragment() {
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_tag, container, false)
+    }
+}
\ No newline at end of file

app/src/main/java/com/paktalin/vocabularynotebook/utils/ActivityUtil.kt

@@ -3,15 +3,17 @@ package com.paktalin.vocabularynotebook.utils
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
-import androidx.fragment.app.Fragment
-import androidx.fragment.app.FragmentManager
 import android.view.View
 import android.widget.Toast
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
 import com.paktalin.vocabularynotebook.R
 import com.paktalin.vocabularynotebook.ui.fragments.ProgressFragment
+import com.paktalin.vocabularynotebook.ui.fragments.TagFragment
 import org.apache.commons.lang3.StringUtils
 
-val progressFragment: Fragment = ProgressFragment()
+val progressFragment = ProgressFragment()
+val tagFragment = TagFragment()
 
 fun addFragment(fragmentManager: FragmentManager, fragment: Fragment, containerId: Int, arguments: Bundle? = null, tag: String? = null) {
     fragment.arguments = arguments
@@ -26,7 +28,16 @@ fun removeFragment(fragmentManager: FragmentManager, fragment: Fragment) {
 }
 
 fun addProgressBar(fragmentManager: FragmentManager, containerId: Int) {
-    addFragment(fragmentManager, progressFragment, containerId, null)
+    addFragment(fragmentManager, progressFragment, containerId)
+}
+
+fun addTagFragment(fragmentManager: FragmentManager, containerId: Int) {
+    if (fragmentManager.findFragmentById(tagFragment.id) == null)
+        addFragment(fragmentManager, tagFragment, containerId)
+}
+
+fun removeTagFragment(fragmentManager: FragmentManager) {
+    removeFragment(fragmentManager, tagFragment)
 }
 
 fun removeProgressBar(fragmentManager: FragmentManager) {

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

@@ -2,6 +2,7 @@
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
+    android:id="@+id/main_activity_container"
     android:layout_height="match_parent">
 
     <LinearLayout
@@ -43,6 +44,4 @@
 
     <include layout="@layout/submit" />
 
-    <include layout="@layout/tag" />
-
 </RelativeLayout>
\ No newline at end of file

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

@@ -7,8 +7,7 @@
     android:layout_height="wrap_content"
     android:layout_alignParentBottom="true"
     android:background="@color/colorPrimary"
-    android:orientation="horizontal"
-    android:visibility="gone">
+    android:orientation="horizontal">
 
     <ImageButton
         android:id="@+id/btnCancelTag"