/frameworks/base/core/res/res/values
1. themes.xml 找到:
<item name="textAppearanceSmall">@android:style/TextAppearance.Small</item>
2. styles.xml 找到
<style name="TextAppearance.Small">
<item name="android:textSize">14sp</item>
<item name="android:textColor">?textColorSecondary</item>
</style>
3. themes.xml 找到
<item name="textColorSecondary">@android:color/secondary_text_light</item>
4. 程序中就可以直接引用 android.R.color.secondary_text_light 这个值，而这个是在
/frameworks/base/core/res/res/color 下定义好复杂啊
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_window_focused="false" android:state_enabled="false" android:color="@android:color/dim_foreground_light_disabled"/>
<item android:state_window_focused="false" android:color="@android:color/dim_foreground_light"/>
<!-- Since there is only one selector (for both light and dark), the light's selected state shouldn't be inversed like the dark's. -->
<item android:state_pressed="true" android:state_enabled="false" android:color="@android:color/dim_foreground_light_disabled"/>
<item android:state_selected="true" android:state_enabled="false" android:color="@android:color/dim_foreground_light_disabled"/>
<item android:state_pressed="true" android:color="@android:color/dim_foreground_light"/>
<item android:state_selected="true" android:color="@android:color/dim_foreground_light"/>
<item android:state_activated="true" android:color="@android:color/bright_foreground_light"/>
<item android:state_enabled="false" android:color="@android:color/dim_foreground_light_disabled"/>
<item android:color="@android:color/dim_foreground_light"/> <!-- not selected -->
</selector>
即，android.R.attr.textAppearanceSmall定义了一个文本的大小和一个文本的颜色。