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I am attempting to add spacing between views in the RecyclerView. Using the RecyclerView I have a repeating list of constraint views using a view adapter. On each constraint view I have set the layout margin to equal 15dp like so android:layout_margin="15dp". When previewing the layout in design view I can see that the margin is being applied however when the app is compiled the RecyclerView.

The XML for the view being used inside the RecyclerView is as follows:

<android.support.constraint.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="wrap_content"

android:layout_margin="15dp"

android:background="@drawable/gradient"

android:clipToPadding="true"

android:minHeight="0dp">



<TextView

    android:id="@+id/moment_timestamp"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginStart="20dp"

    android:layout_marginTop="16dp"

    android:text="28 MAR @ 2:45pm"

    android:textColor="@android:color/white"

    app:layout_constraintEnd_toStartOf="@+id/moment_text"

    app:layout_constraintHorizontal_bias="0.0"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toTopOf="parent" />



<TextView

    android:id="@+id/moment_text"

    android:layout_width="0dp"

    android:layout_height="wrap_content"

    android:layout_marginBottom="20dp"

    android:layout_marginEnd="20dp"

    android:layout_marginStart="20dp"

    android:layout_marginTop="40dp"

    android:background="@android:color/transparent"

    android:includeFontPadding="false"

    android:paddingVertical="0dp"

    android:text="A kind man held the door  open for me today"

    android:textAlignment="viewStart"

    android:textColor="@android:color/white"

    android:textSize="25sp"

    android:textStyle="bold"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toBottomOf="@+id/moment_timestamp" />



</android.support.constraint.ConstraintLayout>

In design view, the component I am designing looks like this:

However, when compiled and being used in the RecyclerView, the margins are not applied:

This is my code where I inflate the layout. Originally the width of the view was not being applied so as shown in this answer I changed my code.

View view = inflater.inflate(R.layout.text_moment, null, false);

RecyclerView.LayoutParams lp = new 

RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

view.setLayoutParams(lp);

return new MomentViewHolder(view);

Searched around quite extensively now and can't seem to find a solution.

Try to to this:

<android.support.constraint.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="wrap_content"

android:layout_marginBottom="15dp" //This line is the important one

android:background="@drawable/gradient"

android:clipToPadding="true"

android:minHeight="0dp">

Or what i always do:

<android.support.constraint.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="wrap_content"

android:padding="16dp" //This line is the important one

android:background="@drawable/gradient"

android:clipToPadding="true"

android:minHeight="0dp">

I've managed to figure out the solution. It turns out the answer that I followed to try and resolve the width issue was causing the margin issue. Instead of setting null as the ViewGroup parameter on the inflate function, I have now passed ViewGroup into the inflate function like so:

View view = inflater.inflate(R.layout.text_moment, viewGroup, false);