通过选择器更改按钮的背景

Question

我有一个按钮，我想单击按钮时，按钮更改图像。我认为一切正常，但当点击按钮，背景按钮改变了一会儿（当我选择这个），然后背景按钮是第一背景颜色:(我的问题是什么？

contact_selector.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/contactpress"></item> 
<item 
    android:state_focused="true" 
    android:drawable="@drawable/contactpress"></item> 
<item 
    android:drawable="@drawable/contact"></item> 
</selector> 

activity_test.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent"> 
<FrameLayout 
    android:id="@+id/frame" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@color/white" 
    android:layout_above="@id/btn"></FrameLayout> 
<Button 
    android:id="@+id/btn" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:background="@drawable/contact_selector" 
    android:layout_alignParentBottom="true"/> 
</RelativeLayout> 

谢谢...

Answer 1

// try this 
<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 

    <item android:drawable="@drawable/contactpress" android:state_pressed="true"></item> 
    <item android:drawable="@drawable/contactpress" android:state_focused="true"></item> 
    <item android:drawable="@drawable/contact" android:state_enabled="true" android:state_focused="false" android:state_pressed="false"></item> 
    <item android:drawable="@drawable/contactpress" android:state_enabled="false"></item> 

</selector>