Wrong custom-dialog size

I got a problem with a custom dialog in an android application.

I got a Custom Dialog with a ListView inside it. The Dialog itself is 600dp width and the ListView is 600dp as well.

The problem is that the dialog is more than that width value:

http://ift.tt/16IoiWW

http://ift.tt/1AWYejQ [Same image with the "Show layout limits" option enabled]

This is the Dialog layout:

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="600dp"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <ListView
        android:id="@+id/promotionListView"
        android:layout_width="600dp"
        android:layout_height="400dp"
        android:scrollbarStyle="insideOverlay"
        android:dividerHeight="1dp" />

    <LinearLayout
        android:layout_width="600dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/promotion_dialog_abort"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/annulla"/>

        <Button
            android:id="@+id/promotion_dialog_apply"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/applica"/>

    </LinearLayout>
</LinearLayout>

This is the layout of the single row: (note that both the width of the layout and the sum of single views is 600dp)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:orientation="horizontal"
    android:layout_width="600dp"    <-- I tried "wrap_content" and "match_parent" with the same result
    android:layout_height="wrap_content">

    <CheckBox
        android:id="@+id/promotionCheck"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:gravity="center"
        android:layout_gravity="center" />

    <TextView
        android:id="@+id/promotionText"
        android:layout_width="350dp"
        android:layout_height="50dp"
        android:gravity="center_vertical"
        android:layout_gravity="center"
        android:textColor="@android:color/white"
        android:textSize="@dimen/customerdetail_headertextsize" />

    <TextView
        android:id="@+id/promotionFactor"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:gravity="center_vertical|right"
        android:layout_gravity="center"
        android:textColor="@android:color/white"
        android:textSize="@dimen/customerdetail_headertextsize" />

    <TextView
        android:id="@+id/promotionPrice"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:gravity="center_vertical|right"
        android:layout_gravity="center"
        android:textColor="@android:color/white"
        android:textSize="@dimen/customerdetail_headertextsize" />

</LinearLayout>

And finally the Custom Dialog Class

public class PromotionDialog extends Dialog {

private boolean authCode;
private Set<OrderDetailDiscount> promotions;
private List<OrderDetailDiscount> selectedPromotions;

private ListView mainListView;

public Response response = Response.CANCEL;

private Button buttonAbort;
private Button buttonAccept;

public PromotionDialog(Context context, boolean authCode, Set<OrderDetailDiscount> promotions) {
    super(context);

    this.authCode = authCode;
    this.promotions = promotions;

    selectedPromotions = new ArrayList<>();

    setTitle("Promozioni");
    setContentView(R.layout.isfa_promotiondialog);

    buttonAbort = (Button) findViewById(R.id.promotion_dialog_abort);
    buttonAccept = (Button) findViewById(R.id.promotion_dialog_apply);
}

}

I really can't understand what the problem is, I tried to manually resize the titlebar with no success... what could I possibbly try?