<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true" android:color="@android:color/black"></item>    <item android:color="#fff"></item></selector>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/button_red_pressed" android:state_pressed="true"></item>    <item android:drawable="@drawable/button_red_normal"></item></selector>

<Button        android:id="@+id/btn_start"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="60dp"        android:background="@drawable/btn_guide_selector"        android:paddingLeft="5dp"        android:paddingRight="5dp"        android:text="开始体验"        android:textColor="@color/txt_guide_selector"        android:visibility="gone" >    </Button>