一、新建按钮样式button_styles.xml

项目上点击右键->New->Android XML File

<?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/wallet_base_pwdpay_submit_bg_pressed" /> 
    <item android:state_focused="true" android:drawable="@drawable/wallet_base_pwdpay_submit_bg_pressed" /> 
    <item android:drawable="@drawable/wallet_base_pwdpay_submit_bg_normal" />
</selector>

二、设置Button的android:background属性

<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.test.androidtest.MainActivity$PlaceholderFragment" >

    <Button android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/button_styles"
        android:text="Button"
        android:padding="10dp"
        android:onClick="onClick" />

</LinearLayout >

运行测试