How to change my search bar to be transparent background?

I use fragment to set up search of my view. I want to set my icons to be white, set search bar to be transparent color. When it comes to execution, the search bar is still white. Would you please tell me what to do ?

Here is my code :

```
override fun onCreateView(inflater: LayoutInflater , container: ViewGroup? , savedInstanceState: Bundle?): View? {

val rootView = inflater.inflate(R.layout.fragment_main , container , false)
val topSearchBar = rootView.findViewById(R.id.searchBar) as MaterialSearchBar
topSearchBar.placeHolderView.setBackgroundColor(Color.TRANSPARENT)
topSearchBar.searchEditText.setBackgroundColor(Color.TRANSPARENT)
topSearchBar.setPlaceHolderColor(Color.TRANSPARENT)
//topSearchBar.searchBar
return rootView
}

```

Start with the onCreateView code in the issue and the MaterialSearchBar API, focusing on which view controls the rendered search-bar background and icons. Confirm the relevant behavior on an Android screen; done means the search bar background is transparent and its icons are white.

Written by the indexing model from the issue text.