Child views added dynamically without calculated margin values inside RelativeLayout as holder

Question

I tried adding views to RelativeLayout holder with assigning left margin to layout params.

The views got added but margin was not given while adding, resulting in overlapping views .

My Java method to dynamically add Card (child view):

public void addCard(LinearLayout card)
{
    LayoutParams params = new LayoutParams(card.getLayoutParams());
    params.leftMargin = (this.mainHolder.getChildCount() * ((int) pxToDp(this.mContext.getResources().getDimension(R.dimen.card_margin)))) + 10;

    this.mainHolder.addView(card, params);
    this.mainHolder.setGravity(RelativeLayout.END_OF);
    card.setOnTouchListener(new MyTouchListener());
}

Main holder layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clipChildren="false"
    android:padding="4dp" />

Desired output