<Button
    android:id="@+id/btn_start"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="立即体验"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="80dp"
    android:textSize="25sp"
    android:textColor="@drawable/guide_btntext_selector"
    android:background="@drawable/guide_btn_selector"
    android:paddingTop="5dp"
    android:paddingBottom="5dp"
    android:paddingRight="20dp"
    android:paddingLeft="20dp"
    android:visibility="gone"
    />

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
  >
  <item android:state_pressed="true" android:color="#000"/>
  <item android:state_pressed="false" android:color="#fff"/>
</selector>

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