1. Your card view contains multiple child elements without containing viewGroup(Relative or constraint layout) in the cardview first you take one view group and inside place all whatever you want.

2. It maybe because of your android:background="@drawable/custom_text" check it this properly it once what it is doing.

3. Remove backgroundTint for the card it maybe confict with the cardview

4. And try to apply the visiblity for the edittext at run time edittext.setVisibility(View.VISIBLE);

let me know still if you face any issue