As kwasi wrote and golu edited, you can use transparent, instead of white:
File drawable/transparent.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="@android:color/transparent"/>
</shape>
Inside an activity, view, etc:
view.setImageResource(R.drawable.transparent);