How to bring imageView in front of cardview ? When both are of Relative Layout childs

CardView has default elevation which is greater than ImageView, So we have to add greater elevation in ImageView than CardView's elevation.

e.g. imageView.setElevation(10); and cardView.setElevation(5);

Now, its working fine on all devices.

Do it like this,

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/myCardView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    card_view:cardBackgroundColor="@android:color/transparent"
    card_view:cardElevation="0dp">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_edit"
            android:background="@android:color/transparent"/>

</android.support.v7.widget.CardView>

It will bring the ImageView to front.

Write this line in your java code after initializing the ImageView.

imageView.bringToFront();