Keyboard is hidden after adding a new word

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

@@ -11,6 +11,10 @@ import com.google.firebase.firestore.FirebaseFirestore
 import com.paktalin.vocabularynotebook.R
 import kotlinx.android.synthetic.main.activity_main.*
 import android.view.WindowManager
+import android.app.Activity
+import android.view.View
+import android.view.inputmethod.InputMethodManager
+
 
 class MainActivity : AppCompatActivity() {
 
@@ -60,6 +64,15 @@ class MainActivity : AppCompatActivity() {
         window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
     }
 
+    fun hideKeyboard(activity: Activity) {
+        val imm = activity.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
+        var view = activity.currentFocus
+        if (view == null) {
+            view = View(activity)
+        }
+        imm.hideSoftInputFromWindow(view.windowToken, 0)
+    }
+
     companion object {
         private val TAG = "VN/" + MainActivity::class.simpleName
     }

app/src/main/java/com/paktalin/vocabularynotebook/ui/NewWordFragment.kt

@@ -8,6 +8,7 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.FrameLayout
 import android.widget.ImageButton
 import android.widget.Toast
 import com.google.firebase.firestore.FirebaseFirestore
@@ -62,17 +63,18 @@ class NewWordFragment : Fragment() {
     }
 
     private fun showAddWordButton() {
-        activity!!.findViewById<ImageButton>(R.id.btnAddWord).visibility = View.VISIBLE }
+        activity!!.findViewById<FrameLayout>(R.id.btnAddWordLayout).visibility = View.VISIBLE }
 
     private fun hideAddWordButton() {
-        activity!!.findViewById<ImageButton>(R.id.btnAddWord).visibility = View.GONE }
+        activity!!.findViewById<FrameLayout>(R.id.btnAddWordLayout).visibility = View.GONE }
 
     private fun hideClearButton() { btnClear.visibility = View.GONE }
 
     private fun showClearButton() { btnClear.visibility = View.VISIBLE }
 
     private fun addWord() {
-        //todo get word data from edit texts and save it
+        (activity as MainActivity).hideKeyboard(activity as MainActivity)
+
         val word = etWord.text.toString()
         val translation = etTranslation.text.toString()
         val vocabularyId = (activity as MainActivity).vocabularyId

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

@@ -41,6 +41,14 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/fragment_new_word" />
 
+        <FrameLayout
+            android:id="@+id/btnAddWordLayout"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:layout_constraintBottom_toBottomOf="parent"
+            android:background="@color/colorPrimary"
+            android:visibility="invisible">
+
             <ImageButton
                 android:id="@+id/btnAddWord"
                 android:layout_width="wrap_content"
@@ -49,11 +57,11 @@
                 android:layout_marginEnd="8dp"
                 android:layout_marginRight="8dp"
                 android:background="@android:color/transparent"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintEnd_toEndOf="parent"
-            android:visibility="invisible"
+                android:layout_gravity="end"
                 app:srcCompat="@drawable/ic_done_icon" />
 
+        </FrameLayout>
+
     </android.support.constraint.ConstraintLayout>
 
     <android.support.design.widget.NavigationView