How can I add semi-transparent overlay on imageview? 

[![enter image description here](https://i.stack.imgur.com/fpxY9.png)](https://i.stack.imgur.com/fpxY9.png)

change it to

[![enter image description here](https://i.stack.imgur.com/1rB3n.png)](https://i.stack.imgur.com/1rB3n.png)