Button按钮点击变颜色

Button布局,背景设为btn_bg

<Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登陆" android:onClick="login" android:background="@drawable/btn_bg" />

btn_bg的xml

<?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/btn1"></item> <item android:drawable="@drawable/btn2"></item> </selector>