android4.2.2 Settings

 

出自 ：http://blog.youkuaiyun.com/abc137508277/article/details/8878885

Setting分析

Setting的启动要从setting.java中分析。为topactivity extends PreferenceActivity

PreferenceActivity英语文档

This activityshows one or more headers of preferences, each of which is associated with a PreferenceFragment to display the preferences of that header. The actuallayout and display of these associations can however vary; currently there aretwo major approaches it may take:

·        On a small screen it may display only the headers as asingle list when first launched. Selecting one of the header items willre-launch the activity with it only showing the PreferenceFragment of thatheader.

·        On a large screen in may display both the headers andcurrent PreferenceFragment together as panes. Selecting a header item switchesto showing the correct PreferenceFragment for that item.

以上意思翻译过来就是说，preferrenceActivity可以显示1个或者多个header。每个header都是以PreferenceFragment显示。

PreferenceActivity显示也分两种，

一种是在小的屏幕上，或者低分辨率设备上，只显示header部分。点击header进入fragment。

另外一种是在大的屏幕上或者高分辨率设备上，header和fragment同时显示，左侧是header，右侧是fragment.

在onBuildHeaders加载主界面

loadHeadersFromResource(R.xml.settings_headers,headers);

其中addPreferencesFromResource methodwas deprecated in API level 11

各个fragment是依附于subsetting的，由subsetting统一管理各个fragment。相当于一个activity在多个UI界面之间的切换。

其设置里面的Google Account有个location setting,这个东西是在GoogleServicesFramework.apk中添加的。没有源码，这个是google服务框架。

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