Final commit

app/src/main/java/com/example/h_mal/messengerapp/application/AppClass.kt

@@ -19,6 +19,7 @@ import org.kodein.di.generic.singleton
 class AppClass: Application(), KodeinAware{
 
     // Kodein aware to initialise the classes used for DI
+    // Simple DI module creation where @instance() automatically becomes required class (eg. context or singleton)
     @ExperimentalCoroutinesApi
     override val kodein = Kodein.lazy {
         import(androidXModule(this@AppClass))

app/src/main/java/com/example/h_mal/messengerapp/ui/main/MainFragment.kt

@@ -8,6 +8,7 @@ import android.view.ViewGroup
 import android.view.inputmethod.EditorInfo
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
+import androidx.recyclerview.widget.DefaultItemAnimator
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.example.h_mal.messengerapp.R
@@ -64,11 +65,11 @@ class MainFragment : Fragment(), KodeinAware {
                     }
                 })
             }
-
         }
 
         message_box_et.apply {
             setOnEditorActionListener { _, actionId, _ ->
+                // Press enter to send message
                 when (actionId) {
                     EditorInfo.IME_ACTION_DONE ->{
                         viewModel.submitMessage(text.toString())
@@ -79,6 +80,7 @@ class MainFragment : Fragment(), KodeinAware {
             }
 
             submit.setOnClickListener {
+                // send message on submit
                 viewModel.submitMessage(text.toString())
                 text.clear()
             }

app/src/main/java/com/example/h_mal/messengerapp/ui/main/MessageRecyclerAdapter.kt

@@ -18,7 +18,7 @@ const val SENT_CONST = 101
 const val RECEIVED_CONST = 102
 const val TIMESTAMP_CONST = 103
 class MessageRecyclerAdapter(
-    val messageLiveData: LiveData<List<MessageEntity>>
+    messageLiveData: LiveData<List<MessageEntity>>
 ) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
     var messages: List<MessageEntity>? = null