1.Android?settings源碼的source code路徑為：

kikat_4.4_CTS\packages\apps\Settings

?

2.settings主界面UI布局

Settings的啟動(dòng)類為：

[java]?view plaincopy

/**?

?*?Top-level?settings?activity?to?handle?single?pane?and?double?pane?UI?layout.?

?*/??

public?class?Settings?extends?PreferenceActivity??

????????implements?ButtonBarHandler,?OnAccountsUpdateListener??

從繼承關(guān)系可以看出，Settings類繼承于PreferenceActivity，因此具有Preference的一些屬性和結(jié)構(gòu)。

?

從Google? settings的UI看出，左邊是一些tab，右邊是tab對(duì)應(yīng)的內(nèi)容，那么這些tab以及tab對(duì)應(yīng)的內(nèi)容主要是什么，以及如何顯示的呢？

?

對(duì)于tab的顯示，對(duì)應(yīng)的code為：

[java]?view plaincopy

/**?

????*?Populate?the?activity?with?the?top-level?headers.?

????*/??

???@Override??

???public?void?onBuildHeaders(List<Header>?headers)?{??

???????if?(!onIsHidingHeaders())?{??

???????????loadHeadersFromResource(R.xml.settings_headers,?headers);??

???????????updateHeaderList(headers);??

???????}??

???}??

可以看出，左邊的tab實(shí)際是一些Header，從settings_headers.xml中獲取這些header。settings_header.xml對(duì)應(yīng)的code為：

[html]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<!--?Copyright?(C)?2010?The?Android?Open?Source?Project??

??

?????Licensed?under?the?Apache?License,?Version?2.0?(the?"License");??

?????you?may?not?use?this?file?except?in?compliance?with?the?License.??

?????You?may?obtain?a?copy?of?the?License?at??

??

??????????http://www.apache.org/licenses/LICENSE-2.0??

??

?????Unless?required?by?applicable?law?or?agreed?to?in?writing,?software??

?????distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS,??

?????WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied.??

?????See?the?License?for?the?specific?language?governing?permissions?and??

?????limitations?under?the?License.??

-->??

??

<preference-headers??

????????xmlns:android="http://schemas.android.com/apk/res/android">??

??

??

????<!--?WIRELESS?and?NETWORKS?-->??

????<header?android:id="@+id/wireless_section"??

????????android:title="@string/header_category_wireless_networks"?/>??

??

????<!--?Wifi?-->??

????<!--?MStar?Android?Patch?Begin?-->??

????<header??

????????android:id="@+id/wifi_settings"??

????????android:fragment="com.android.settings.wifi.TvWifiSettings"??

????????android:title="@string/wifi_settings_title"??

????????android:icon="@drawable/ic_settings_wireless"?/>??

????<!--?MStar?Android?Patch?End?-->??

??

????<!--?Ethernet?-->??

????<header??

????????android:id="@+id/ethernet_settings"??

????????android:fragment="com.android.settings.ethernet.EthernetSettings"??

????????android:title="@string/ethernet_status_title"??

????????android:icon="@drawable/ic_settings_ethernet"?/>??

??

????<!--?Bluetooth?-->??

????<header??

????????android:id="@+id/bluetooth_settings"??

????????android:fragment="com.android.settings.bluetooth.TvBluetoothSettings"??

????????android:title="@string/bluetooth_settings_title"??

????????android:icon="@drawable/ic_settings_bluetooth2"?/>??

??

????<!--?Data?Usage?-->??

????<header??

????????android:id="@+id/data_usage_settings"??

????????android:fragment="com.android.settings.DataUsageSummary"??

????????android:title="@string/data_usage_summary_title"??

????????android:icon="@drawable/ic_settings_data_usage"?/>??

??

????<!--?Operator?hook?-->??

????<header??

????????android:fragment="com.android.settings.WirelessSettings"??

????????android:id="@+id/operator_settings">??

????????<intent?android:action="com.android.settings.OPERATOR_APPLICATION_SETTING"?/>??

????</header>??

??

????<!--?Other?wireless?and?network?controls?-->??

????<header??

????????android:id="@+id/wireless_settings"??

????????android:title="@string/radio_controls_title"??

????????android:breadCrumbTitle="@string/wireless_networks_settings_title"??

????????android:fragment="com.android.settings.WirelessSettings"??

????????android:icon="@drawable/empty_icon"?/>??

??

????<!--?DEVICE?-->??

????<header?android:id="@+id/device_section"??

????????android:title="@string/header_category_device"?/>??

??

????<!--?Home?-->??

????<header??

????????android:id="@+id/home_settings"??

????????android:icon="@drawable/ic_settings_home"??

????????android:fragment="com.android.settings.HomeSettings"??

????????android:title="@string/home_settings"?/>??

??

????<!--?Sound?-->??

????<header??

????????android:id="@+id/sound_settings"??

????????android:icon="@drawable/ic_settings_sound"??

????????android:fragment="com.android.settings.SoundSettings"??

????????android:title="@string/sound_settings"?/>??

??

????<!--?Display?-->??

????<header??

????????android:id="@+id/display_settings"??

????????android:icon="@drawable/ic_settings_display"??

????????android:fragment="com.android.settings.DisplaySettings"??

????????android:title="@string/display_settings"?/>??

??

????<!--?Storage?-->??

????<header??

????????android:id="@+id/storage_settings"??

????????android:fragment="com.android.settings.deviceinfo.Memory"??

????????android:icon="@drawable/ic_settings_storage"??

????????android:title="@string/storage_settings"?/>??

??

????<!--?Battery?-->??

????<header??

????????android:id="@+id/battery_settings"??

????????android:fragment="com.android.settings.fuelgauge.PowerUsageSummary"??

????????android:icon="@drawable/ic_settings_battery"??

????????android:title="@string/power_usage_summary_title"?/>??

??

????<!--?Application?Settings?-->??

????<header??

????????android:fragment="com.android.settings.applications.ManageApplications"??

????????android:icon="@drawable/ic_settings_applications"??

????????android:title="@string/applications_settings"??

????????android:id="@+id/application_settings"?/>??

??

????<!--?Manage?users?-->??

????<header??

????????android:fragment="com.android.settings.users.UserSettings"??

????????android:icon="@drawable/ic_settings_multiuser"??

????????android:title="@string/user_settings_title"??

????????android:id="@+id/user_settings"?/>??

??

????<!--?Manage?NFC?payment?apps?-->??

????<header??

????????android:fragment="com.android.settings.nfc.PaymentSettings"??

????????android:icon="@drawable/ic_settings_nfc_payment"??

????????android:title="@string/nfc_payment_settings_title"??

????????android:id="@+id/nfc_payment_settings"?/>??

??

????<!--?Manufacturer?hook?-->??

????<header??

????????android:fragment="com.android.settings.WirelessSettings"??

????????android:id="@+id/manufacturer_settings">??

????????<intent?android:action="com.android.settings.MANUFACTURER_APPLICATION_SETTING"?/>??

????</header>??

??

????<!--?PERSONAL?-->??

????<header?android:id="@+id/personal_section"??

????????android:title="@string/header_category_personal"?/>??

??

????<!--?Location?-->??

????<header??

????????android:fragment="com.android.settings.location.LocationSettings"??

????????android:icon="@drawable/ic_settings_location"??

????????android:title="@string/location_settings_title"??

????????android:id="@+id/location_settings"?/>??

??

????<!--?Security?-->??

????<header??

????????android:fragment="com.android.settings.SecuritySettings"??

????????android:icon="@drawable/ic_settings_security"??

????????android:title="@string/security_settings_title"??

????????android:id="@+id/security_settings"?/>??

??

????<!--?Language?-->??

????<header??

????????android:id="@+id/language_settings"??

????????android:fragment="com.android.settings.inputmethod.InputMethodAndLanguageSettings"??

????????android:icon="@drawable/ic_settings_language"??

????????android:title="@string/language_settings"?/>??

??

????<!--?Backup?and?reset?-->??

????<header??

????????android:fragment="com.android.settings.PrivacySettings"??

????????android:icon="@drawable/ic_settings_backup"??

????????android:title="@string/privacy_settings"??

????????android:id="@+id/privacy_settings"?/>??

??

????<!--?@Patch:?GTV?specific?changes?-->??

????<!--?MStar?Android?Patch?Begin?-->??

????<!--?Update?-->??

????<header??

????????android:id="@+id/update_settings"??

????????android:fragment="com.android.settings.update.UpdateSettings"??

????????android:title="@string/update_settings"?/>??

????<!--?MStar?Android?Patch?End?-->??

??

????<!--??ACCOUNTS?section?-->??

????<header??

????????????android:id="@+id/account_settings"??

????????????android:title="@string/account_settings"?/>??

??

????<header??

????????????android:id="@+id/account_add"??

????????????android:title="@string/add_account_label"??

????????????android:icon="@drawable/ic_menu_add_dark">??

????????<intent??

????????????android:action="android.settings.ADD_ACCOUNT_SETTINGS"/>??

????</header>??

??

????<!--?SYSTEM?-->??

????<header?android:id="@+id/system_section"??

????????android:title="@string/header_category_system"?/>??

??

????<!--?Date?&?Time?-->??

????<header??

????????android:id="@+id/date_time_settings"??

????????android:fragment="com.android.settings.DateTimeSettings"??

????????android:icon="@drawable/ic_settings_date_time"??

????????android:title="@string/date_and_time_settings_title"?/>??

??

????<!--?Accessibility?feedback?-->??

????<header??

????????android:id="@+id/accessibility_settings"??

????????android:fragment="com.android.settings.accessibility.AccessibilitySettings"??

????????android:icon="@drawable/ic_settings_accessibility"??

????????android:title="@string/accessibility_settings"?/>??

??

????<!--?Print?-->??

????<header??

????????android:id="@+id/print_settings"??

????????android:fragment="com.android.settings.print.PrintSettingsFragment"??

????????android:icon="@*android:drawable/ic_print"??

????????android:title="@string/print_settings"?/>??

??

????<!--?Development?-->??

????<header??

????????android:id="@+id/development_settings"??

????????android:fragment="com.android.settings.DevelopmentSettings"??

????????android:icon="@drawable/ic_settings_development"??

????????android:title="@string/development_settings_title"?/>??

??

????<!--?About?Device?-->??

????<header??

????????android:id="@+id/about_settings"??

????????android:fragment="com.android.settings.DeviceInfoSettings"??

????????android:icon="@drawable/ic_settings_about"??

????????android:title="@string/about_settings"?/>??

??

</preference-headers>??

從上述xml可以看出，header的內(nèi)容是通過(guò)fragment來(lái)顯示，定義了每一個(gè)header對(duì)應(yīng)的fragment。

?

在private void updateHeaderList(List<Header> target)函數(shù)中，會(huì)根據(jù)當(dāng)前平臺(tái)是否支持某項(xiàng)feature，決定是否顯示對(duì)應(yīng)的header：

[java]?view plaincopy

else?if?(id?==?R.id.wifi_settings)?{??

???????????????//?Remove?WiFi?Settings?if?WiFi?service?is?not?available.??

???????????????if?(!getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI))?{??

???????????????????target.remove(i);??

???????????????}??

???????????}?else?if?(id?==?R.id.bluetooth_settings)?{??

???????????????//?Remove?Bluetooth?Settings?if?Bluetooth?service?is?not?available.??

???????????????if?(!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH))?{??

???????????????????target.remove(i);??

???????????????}??

???????????}???

?原文地址：http://blog.csdn.net/zhudaozhuan/article/details/40618837

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