出自 ：http://blog.csdn.net/abc137508277/article/details/8878885
Setting分析
Setting的啓動要從setting.java中分析。爲topactivity extends PreferenceActivity
PreferenceActivity英語文檔
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.
以上意思翻譯過來就是說，preferrenceActivity可以顯示1個或者多個header。每個header都是以PreferenceFragment顯示。
PreferenceActivity顯示也分兩種，
一種是在小的屏幕上，或者低分辨率設備上，只顯示header部分。點擊header進入fragment。
另外一種是在大的屏幕上或者高分辨率設備上，header和fragment同時顯示，左側是header，右側是fragment.
在onBuildHeaders加載主界面
loadHeadersFromResource(R.xml.settings_headers,headers);
其中addPreferencesFromResource methodwas deprecated in API level 11
各個fragment是依附於subsetting的，由subsetting統一管理各個fragment。相當於一個activity在多個UI界面之間的切換。其設置裏面的Google Account有個location setting,這個東西是在GoogleServicesFramework.apk中添加的。沒有源碼，這個是google服務框架。
轉載請註明出處，thanks!
