Problems with ListView and layout

i'm using android studio and i'm trying to follow this guide: http://ift.tt/1B5j7LV that implements database but i have problems with " R.layout.listactivity_row.

This guide not explain nowhere how and where to insert "listactiviry_row" Can you help me ?

`@Override public View newView(Context ctx, Cursor arg1, ViewGroup arg2) { View v=getLayoutInflater().inflate(R.layout.listactivity_row, null);

            return v;
        }`   
 

this is main_activiry.xml

<RelativeLayout
android:layout_height="wrap_content"
android:layout_width="400dp"
xmlns:android="http://ift.tt/nIICcg">


<EditText
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:id="@+id/oggetto"
    android:hint="Oggetto"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_marginRight="53dp"
    android:layout_marginTop="20dp" />

<EditText
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:id="@+id/testo"
    android:hint="testo"
    android:layout_below="@+id/oggetto"
    android:layout_alignLeft="@+id/oggetto"
    android:layout_alignStart="@+id/oggetto"
    android:layout_marginRight="53dp" />

<EditText
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:id="@+id/data"
    android:hint="data"
    android:layout_below="@+id/testo"
    android:layout_alignLeft="@+id/testo"
    android:layout_alignStart="@+id/testo" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="salva"
    android:id="@+id/button"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="150dp"
    android:layout_marginLeft="150dp" />

<LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="200dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:weightSum="1">

    <TextView
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:id="@+id/txt_subject"
        android:hint="subject" />

    <TextView
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:id="@+id/txt_date"
        android:layout_marginLeft="110dp"
        android:layout_marginTop="-16dp"
        android:hint="data" />


    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:src="@android:drawable/ic_menu_delete"
        android:id="@+id/btn_delete"
        android:layout_gravity="right"
        android:layout_marginRight="50dp"
        android:layout_marginTop="-10dp" />

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView" />
</LinearLayout>