菜鸟学Android源码——Setting(1)

在上一篇中，我简单介绍了Android源码的下载和编译，还没有下载编译源码的小伙伴请看这里：Android源码分析之——下载并编译源码

关于系统设置App的源码位于：/packages/apps/Settings中，我们可以通过AndroidManifest.xml查看整个Setting应用的入口Activity，从而理清整个应用的脉络，Setting应用的AndroidManifest.xml部分代码如下：

<!-- Settings --><activity android:name="Settings"android:taskAffinity="com.android.settings"android:label="@string/settings_label_launcher"android:launchMode="singleTask"><intent-filter><action android:name="android.settings.SETTINGS" /><category android:name="android.intent.category.DEFAULT" /></intent-filter><meta-data android:name="com.android.settings.PRIMARY_PROFILE_CONTROLLED"android:value="true" /></activity><!-- Alias for launcher activity only, as this belongs to each profile. --><activity-alias android:name="Settings"android:taskAffinity="com.android.settings"android:label="@string/settings_label_launcher"android:launchMode="singleTask"android:targetActivity="Settings"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.DEFAULT" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity-alias><receiver android:name="ManagedProfileSetup"><intent-filter><action android:name="android.intent.action.USER_INITIALIZE"/><action android:name="android.intent.action.PRE_BOOT_COMPLETED"/></intent-filter></receiver>

从上述部分可以看出，整个应用的入口是SettingActivity.java，我们通过分析SettingActivity的onCreate()函数，我们得到如下流程图：

从上图我们可以看到，在SettingActivity.java初始化时其最终进入的是DashboardSummary Fragment，通过查看布局文件，我们最终确定了如下的UI界面对应图：

在Setting中，上图的所有设置选项都是通过res/xml/dashboard_categories.xml配置的，完整的源代码文件如下所示：

<dashboard-categories
        xmlns:android="http://schemas.android.com/apk/res/android"><!-- WIRELESS and NETWORKS --><dashboard-category
            android:id="@+id/wireless_section"android:title="@string/header_category_wireless_networks" ><!-- Wifi --><dashboard-tile
                android:id="@+id/wifi_settings"android:title="@string/wifi_settings_title"android:fragment="com.android.settings.wifi.WifiSettings"android:icon="@drawable/ic_settings_wireless"/><!-- Bluetooth --><dashboard-tile
                android:id="@+id/bluetooth_settings"android:title="@string/bluetooth_settings_title"android:fragment="com.android.settings.bluetooth.BluetoothSettings"android:icon="@drawable/ic_settings_bluetooth2"/><!-- SIM Cards --><dashboard-tile
                android:id="@+id/sim_settings"android:title="@string/sim_settings_title"android:fragment="com.android.settings.sim.SimSettings"android:icon="@drawable/ic_sim_sd"/><!-- Data Usage --><dashboard-tile
                android:id="@+id/data_usage_settings"android:title="@string/data_usage_summary_title"android:fragment="com.android.settings.DataUsageSummary"android:icon="@drawable/ic_settings_data_usage"/><!-- Operator hook --><dashboard-tile
                android:id="@+id/operator_settings"android:fragment="com.android.settings.WirelessSettings" ><intent android:action="com.android.settings.OPERATOR_APPLICATION_SETTING" /></dashboard-tile><!-- Other wireless and network controls --><dashboard-tile
                android:id="@+id/wireless_settings"android:title="@string/radio_controls_title"android:fragment="com.android.settings.WirelessSettings"android:icon="@drawable/ic_settings_more"/></dashboard-category><!-- DEVICE --><dashboard-category
            android:id="@+id/device_section"android:title="@string/header_category_device" ><!-- Home --><dashboard-tile
                android:id="@+id/home_settings"android:title="@string/home_settings"android:fragment="com.android.settings.HomeSettings"android:icon="@drawable/ic_settings_home"/><!-- Display --><dashboard-tile
                android:id="@+id/display_settings"android:title="@string/display_settings"android:fragment="com.android.settings.DisplaySettings"android:icon="@drawable/ic_settings_display"/><!-- Notifications --><dashboard-tile
                android:id="@+id/notification_settings"android:title="@string/notification_settings"android:fragment="com.android.settings.notification.NotificationSettings"android:icon="@drawable/ic_settings_notifications"/><!-- Storage --><dashboard-tile
                android:id="@+id/storage_settings"android:title="@string/storage_settings"android:fragment="com.android.settings.deviceinfo.Memory"android:icon="@drawable/ic_settings_storage"/><!-- Battery --><dashboard-tile
                android:id="@+id/battery_settings"android:title="@string/power_usage_summary_title"android:fragment="com.android.settings.fuelgauge.PowerUsageSummary"android:icon="@drawable/ic_settings_battery"/><!-- Application Settings --><dashboard-tile
                android:id="@+id/application_settings"android:title="@string/applications_settings"android:fragment="com.android.settings.applications.ManageApplications"android:icon="@drawable/ic_settings_applications"/><!-- Manage users --><dashboard-tile
                android:id="@+id/user_settings"android:title="@string/user_settings_title"android:fragment="com.android.settings.users.UserSettings"android:icon="@drawable/ic_settings_multiuser"/><!-- Manage NFC payment apps --><dashboard-tile
                android:id="@+id/nfc_payment_settings"android:title="@string/nfc_payment_settings_title"android:fragment="com.android.settings.nfc.PaymentSettings"android:icon="@drawable/ic_settings_nfc_payment"/><!-- Manufacturer hook --><dashboard-tile
                android:id="@+id/manufacturer_settings"android:fragment="com.android.settings.WirelessSettings"><intent android:action="com.android.settings.MANUFACTURER_APPLICATION_SETTING" /></dashboard-tile></dashboard-category><!-- PERSONAL --><dashboard-category
            android:id="@+id/personal_section"android:title="@string/header_category_personal" ><!-- Location --><dashboard-tile
                android:id="@+id/location_settings"android:title="@string/location_settings_title"android:fragment="com.android.settings.location.LocationSettings"android:icon="@drawable/ic_settings_location"/><!-- Security --><dashboard-tile
                android:id="@+id/security_settings"android:title="@string/security_settings_title"android:fragment="com.android.settings.SecuritySettings"android:icon="@drawable/ic_settings_security"/><!-- Account --><dashboard-tile
                android:id="@+id/account_settings"android:title="@string/account_settings_title"android:fragment="com.android.settings.accounts.AccountSettings"android:icon="@drawable/ic_settings_accounts"/><!-- Language --><dashboard-tile
                android:id="@+id/language_settings"android:title="@string/language_settings"android:fragment="com.android.settings.inputmethod.InputMethodAndLanguageSettings"android:icon="@drawable/ic_settings_language"/><!-- Backup and reset --><dashboard-tile
                android:id="@+id/privacy_settings"android:title="@string/privacy_settings"android:fragment="com.android.settings.PrivacySettings"android:icon="@drawable/ic_settings_backup"/></dashboard-category><!-- SYSTEM --><dashboard-category
        android:id="@+id/system_section"android:title="@string/header_category_system" ><!-- Date & Time --><dashboard-tile
                android:id="@+id/date_time_settings"android:title="@string/date_and_time_settings_title"android:fragment="com.android.settings.DateTimeSettings"android:icon="@drawable/ic_settings_date_time"/><!-- Accessibility feedback --><dashboard-tile
                android:id="@+id/accessibility_settings"android:title="@string/accessibility_settings"android:fragment="com.android.settings.accessibility.AccessibilitySettings"android:icon="@drawable/ic_settings_accessibility"/><!-- Print --><dashboard-tile
                android:id="@+id/print_settings"android:title="@string/print_settings"android:fragment="com.android.settings.print.PrintSettingsFragment"android:icon="@drawable/ic_settings_print"/><!-- Development --><dashboard-tile
                android:id="@+id/development_settings"android:title="@string/development_settings_title"android:fragment="com.android.settings.DevelopmentSettings"android:icon="@drawable/ic_settings_development"/><!-- About Device --><dashboard-tile
                android:id="@+id/about_settings"android:title="@string/about_settings"android:fragment="com.android.settings.DeviceInfoSettings"android:icon="@drawable/ic_settings_about"/></dashboard-category></dashboard-categories>

下一篇中我们将重点介绍在Setting中的自定义ViewGroup的应用。

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