in kotlin why is my recyclerview not scrolling

Question

I am new to recycler views and beginning with Room databases. I am working on this app that lets the user enter records into Room database. The user enters the info and it gets stored. The top part of the screen is the data entry and the bottom is the recycler view where the records are displayed. Everything is fine until there are enough records to fill the available space. Then the new records just disappear below the screen. There is animation when the user tries to scroll, but the items don't move. I tried to make the items bigger by adding a padding, and strangely enough there is scrolling now, but just to the same item that displayed before.

This is the main.xml

<?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"
                                                   xmlns:tools="http://schemas.android.com/tools"
                                                   android:layout_width="match_parent"
                                                   android:layout_height="match_parent"
                                                   android:padding="10dp"
                                                   tools:context=".MainActivity">

    <TextView
            android:id="@+id/tvNameLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Name"
            app:layout_constraintBottom_toBottomOf="@id/etName"
            app:layout_constraintTop_toTopOf="@+id/etName"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/etName"

    />

    <EditText
            android:id="@+id/etName"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:hint="Enter Name"
            android:layout_marginStart="16dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toEndOf="@+id/tvNameLabel"/>

    <TextView
            android:id="@+id/tvEmailLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Email Id"
            app:layout_constraintBottom_toBottomOf="@+id/etMailId"
            app:layout_constraintEnd_toStartOf="@+id/etMailId"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etName"/>

    <EditText
            android:id="@+id/etMailId"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:hint="Enter Email Id"
            android:layout_marginStart="8dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/tvEmailLabel"
            app:layout_constraintTop_toBottomOf="@+id/etName"/>

    <Button
            android:id="@+id/btnAdd"
            android:layout_width="match_parent"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="20dp"
            android:layout_height="80dp"
            android:text="ADD RECORD"
            app:layout_constraintTop_toBottomOf="@+id/etMailId"/>

    <TextView
            android:id="@+id/tvName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:gravity="center"
            android:text="All The Inserted Records"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold"
            app:layout_constraintTop_toBottomOf="@+id/btnAdd"/>

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rvItemsList"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toBottomOf="@id/tvName"
            android:visibility="visible"
            tools:visibility="visible"
    />

    <TextView
            android:id="@+id/tvNoRecordsAvailable"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/btnAdd"
            android:gravity="center"
            android:textSize="18sp"
            android:textColor="#997b66"
            android:text="There Are No records"
            tools:visibility="visible"/>


</androidx.constraintlayout.widget.ConstraintLayout>

and this is the items xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/llMain"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="horizontal"
              android:gravity="center_vertical"
              android:padding="20dp">

    <TextView
            android:id="@+id/tvName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/black"
            android:textSize="16sp"
            android:text="Name"/>

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="5dp"
            android:layout_marginEnd="5dp"
            android:textSize="18sp"
            android:textStyle="bold"
            android:text=":"/>

    <TextView
            android:id="@+id/tvEmail"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textColor="@color/black"
            android:textSize="16sp"
            android:text="Email"/>

    <ImageView
            android:id="@+id/ivEdit"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:contentDescription="image"
            android:foreground="?attr/selectableItemBackgroundBorderless"
            android:scaleType="center"
            android:src="@drawable/ic_action_edit"/>

    <ImageView
            android:id="@+id/ivDelete"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:contentDescription="image"
            android:foreground="?attr/selectableItemBackgroundBorderless"
            android:scaleType="center"
            android:src="@drawable/ic_action_delete"/>

</LinearLayout>

I don't know if any of the other files could be the culprits; but I can add them.

Any help would be greatly appreciated.

Answer 1

I think you need to two things.

1. Try making the Recycler View in the main.xml file as big vertically as possible. For example android:layout_height="0dp"
2. I think you should add constraints to the Recycler View. Something like app:layout_constraintStart_toStartOf="parent" and app:layout_constraintEnd_toEndOf="parent"