android 控件在不同状态下的内容样式与背景样式

1 控件内容（如字体颜色）在不同状态下有不同的表现色
ref:http://developer.android.com/guide/topics/resources/color-list-resource.html
res/color/radio_state.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:color="hex_color"        android:state_pressed=["true" | "false"]        android:state_focused=["true" | "false"]        android:state_selected=["true" | "false"]        android:state_checkable=["true" | "false"]        android:state_checked=["true" | "false"]        android:state_enabled=["true" | "false"]        android:state_window_focused=["true" | "false"] /></selector>

2. 控件背景（背景样式与颜色）在不同状态下的不同表现结果：
ref：http://developer.android.com/guide/topics/resources/drawable-resource.html
res/drawable/radio_state.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"    android:constantSize=["true" | "false"]    android:dither=["true" | "false"]    android:variablePadding=["true" | "false"] >    <item        android:drawable="@[package:]drawable/drawable_resource"        android:state_pressed=["true" | "false"]        android:state_focused=["true" | "false"]        android:state_hovered=["true" | "false"]        android:state_selected=["true" | "false"]        android:state_checkable=["true" | "false"]        android:state_checked=["true" | "false"]        android:state_enabled=["true" | "false"]        android:state_activated=["true" | "false"]        android:state_window_focused=["true" | "false"] /></selector>

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