按钮的多样话 selector的使用

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

XML file in your project res/drawable/ folder

引用 ImageButton ( android:src attribute).

http://developer.android.com/intl/de/reference/android/widget/ImageButton.html

http://developer.android.com/intl/fr/reference/android/graphics/drawable/StateListDrawable.html

styles 不能代码修改 theme可以动态修改

http://developer.android.com/intl/fr/guide/topics/ui/themes.html

res/drawable/my_button.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/btn_pressed" />
<item
android:state_pressed="false"
android:drawable="@drawable/btn_normal" />
</selector>
Button如此设置android:background="@drawable/my_button".

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