Place ImageView over Button android

Question

I am trying to place an ImageView over a Button using RelativeLayout. Here is my xml:

Answer 1

I found a solution: simply android:elevation="2dp"

<Button
        android:id="@+id/btnAccess"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_gravity="right|center"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"/>

<ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView4"
        android:background="@drawable/or"
        android:layout_alignBottom="@+id/btnRegister"
        android:layout_centerHorizontal="true"
        android:layout_margin="5dp"
        android:elevation="2dp" />

Answer 2

Actually it's much easier to just set the StateListAnimator to @null

<Button
    ...
    android:stateListAnimator="@null" />

Source Android 5.0 android:elevation Works for View, but not Button?

Answer 3

Button is just a TextView with a certain style applied to it, so if you replace Button with TextView you can display an ImageView on top of it. This also works on API < 21.