<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:aapt="http://schemas.android.com/aapt"> <item android:state_focused="true" android:drawable="@drawable/abc_btn_default_mtrl_shape"/> <item android:state_pressed="true" android:drawable="@drawable/abc_btn_default_mtrl_shape"/> <item android:drawable="@android:color/transparent"/> </selector>Download file