<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="@dimen/menu_padding"
android:background="@color/customBlue"
android:divider="@drawable/list_divider"
android:dividerHeight="2px" />

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal"
tools:ignore="contentDescription"
android:background="@color/strongBlue" >

    <ImageView
        android:id="@+id/row_icon"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:padding="10dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/row_title"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center_vertical"
        android:padding="10dp"
        android:textColor="@color/white"
        android:textAppearance="@android:style/TextAppearance.Medium" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:bottom="1px">
        <shape android:shape="line">
            <stroke
                    android:color="#0C0832"
                    android:width="2dp"
                    />
            <size
                    android:height="1px"
                    />
        </shape>
    </item>
    <item android:top="1px">
        <shape android:shape="line">
            <stroke
                    android:color="#2D2E57"
                    android:width="2dp"
                    />
            <size
                    android:height="1px"
                    />
        </shape>
    </item>
</layer-list>

Instead of pixel you can provide dp

 android:dividerHeight="10dp"
        android:divider="#ffffff"

Instead of making custom drawable for divider you can directly give color to  divider.