本文深入剖析了SettingsActivity类，包括其继承的接口与类的作用、关键字段的用途、仪表板加载逻辑及配置文件等内容。
5.0的Settings模块的分析２
一、继续上篇，来整体分析一个类：SettingsActivity.java
public class SettingsActivity extends Activity
implements PreferenceManager.OnPreferenceTreeClickListener,
PreferenceFragment.OnPreferenceStartFragmentCallback,
ButtonBarHandler, FragmentManager.OnBackStackChangedListener,
SearchView.OnQueryTextListener, SearchView.OnCloseListener,
MenuItem.OnActionExpandListener {
private static final String LOG_TAG = "Settings";
///M: change backup reset title
private ISettingsMiscExt mExt;
１、首先来看看继承了哪些接口和类，这些接口和类有什么作用，这是首先要知道的！
２、PreferenceManager.OnPreferenceTreeClickListener接口，是设置中选项的点击监听事件接口，
３、PreferenceFragment.OnPreferenceStartFragmentCallback接口，是启动一个fragment之后的回调接口
４、ButtonBarHandler接口，是判断是否有下一个按钮和获取下一个按钮控件的接口；
５、FragmentManager.OnBackStackChangedListener接口，是按返回堆栈改变的接口；
６、SearchView.OnQueryTextListener接口，是用在搜索界面输入字符时激发该接口的；
７、SearchView.OnCloseListener接口，是在搜索界面关闭时，需要执行的接口；
８、MenuItem.OnActionExpandListener接口，是在右上方菜单展开和隐藏时需要执行的接口；
９、 private ISettingsMiscExt mExt该对象是扩展对象；
// Constants for state save/restore
private static final String SAVE_KEY_CATEGORIES = ":settings:categories";
private static final String SAVE_KEY_SEARCH_MENU_EXPANDED = ":settings:search_menu_expanded";
private static final String SAVE_KEY_SEARCH_QUERY = ":settings:search_query";
private static final String SAVE_KEY_SHOW_HOME_AS_UP = ":settings:show_home_as_up";
private static final String SAVE_KEY_SHOW_SEARCH = ":settings:show_search";
private static final String SAVE_KEY_HOME_ACTIVITIES_COUNT = ":settings:home_activities_count";
10、以上的常量是用来保存和恢复状态的，在onSaveInstanceState(Bundle outState)函数中保存，onCreate(Bundle savedState) 方法中使用；
１１、":settings:categories"是用于存储类别，也就是显示的条目的；
":settings:search_menu_expanded"用于存储搜索展开的菜单字段；
":settings:search_query"，存储查询的字段；
”:settings:show_home_as_up“，存储左上角是否有小图标的字段；
":settings:show_search"，显示搜索的结果；
":settings:home_activities_count"，显示launcher home activity的个数;一般只有一个，也可能有多个
/**
* When starting this activity, the invoking Intent can contain this extra
* string to specify which fragment should be initially displayed.
* <p/>Starting from Key Lime Pie, when this argument is passed in, the activity
* will call isValidFragment() to confirm that the fragment class name is valid for this
* activity.
*/
public static final String EXTRA_SHOW_FRAGMENT = ":settings:show_fragment";
/**
* When starting this activity and using {@link #EXTRA_SHOW_FRAGMENT},
* this extra can also be specified to supply a Bundle of arguments to pass
* to that fragment when it is instantiated during the initial creation
* of the activity.
*/
public static final String EXTRA_SHOW_FRAGMENT_ARGUMENTS = ":settings:show_fragment_args";
12、上面两个一个存储fragment，一个是存储传递给fragment的参数args；
// extras that allow any preference activity to be launched as part of a wizard
// show Back and Next buttons? takes boolean parameter
// Back will then return RESULT_CANCELED and Next RESULT_OK
protected static final String EXTRA_PREFS_SHOW_BUTTON_BAR = "extra_prefs_show_button_bar";
// add a Skip button?
private static final String EXTRA_PREFS_SHOW_SKIP = "extra_prefs_show_skip";
// specify custom text for the Back or Next buttons, or cause a button to not appear
// at all by setting it to null
protected static final String EXTRA_PREFS_SET_NEXT_TEXT = "extra_prefs_set_next_text";
protected static final String EXTRA_PREFS_SET_BACK_TEXT = "extra_prefs_set_back_text";
13、这是在第一次开机之后，授权机器进入设置界面wifi界面，传来的字段；
"extra_prefs_show_button_bar"：是否显示按钮条，
"extra_prefs_show_skip"：是否显示跳过
"extra_prefs_set_next_text"：是否显示下一步
"extra_prefs_set_back_text"：是否显示返回
/**
* When starting this activity and using {@link #EXTRA_SHOW_FRAGMENT},
* those extra can also be specify to supply the title or title res id to be shown for
* that fragment.
*/
public static final String EXTRA_SHOW_FRAGMENT_TITLE = ":settings:show_fragment_title";
/**
* The package name used to resolve the title resource id.
*/
public static final String EXTRA_SHOW_FRAGMENT_TITLE_RES_PACKAGE_NAME =
":settings:show_fragment_title_res_package_name";
public static final String EXTRA_SHOW_FRAGMENT_TITLE_RESID =
":settings:show_fragment_title_resid";
public static final String EXTRA_SHOW_FRAGMENT_AS_SHORTCUT =
":settings:show_fragment_as_shortcut";
public static final String EXTRA_SHOW_FRAGMENT_AS_SUBSETTING =
":settings:show_fragment_as_subsetting";
private static final String META_DATA_KEY_FRAGMENT_CLASS =
"com.android.settings.FRAGMENT_CLASS";
private static final String EXTRA_UI_OPTIONS = "settings:ui_options";
private static final String EMPTY_QUERY = "";/**
* When starting this activity and using {@link #EXTRA_SHOW_FRAGMENT},
* those extra can also be specify to supply the title or title res id to be shown for
* that fragment.
*/
public static final String EXTRA_SHOW_FRAGMENT_TITLE = ":settings:show_fragment_title";
/**
* The package name used to resolve the title resource id.
*/
public static final String EXTRA_SHOW_FRAGMENT_TITLE_RES_PACKAGE_NAME =
":settings:show_fragment_title_res_package_name";
public static final String EXTRA_SHOW_FRAGMENT_TITLE_RESID =
":settings:show_fragment_title_resid";
public static final String EXTRA_SHOW_FRAGMENT_AS_SHORTCUT =
":settings:show_fragment_as_shortcut";
public static final String EXTRA_SHOW_FRAGMENT_AS_SUBSETTING =
":settings:show_fragment_as_subsetting";
private static final String META_DATA_KEY_FRAGMENT_CLASS =
"com.android.settings.FRAGMENT_CLASS";
private static final String EXTRA_UI_OPTIONS = "settings:ui_options";
private static final String EMPTY_QUERY = "";
14、 ":settings:show_fragment_title"：表示从外部传过来的fragment标题字段；
":settings:show_fragment_title_res_package_name"：表示显示fragment的包名名称
":settings:show_fragment_title_resid"：表示获取fragment的标题资源id
":settings:show_fragment_as_shortcut"：表示从shortcut中传过来的字段，也就是launcher界面的快捷方式
":settings:show_fragment_as_subsetting"：表示子设置
"com.android.settings.FRAGMENT_CLASS"：表示fragment的类名
"settings:ui_options"：表示ui的选择选项，应该不对，真是不知道是什么，getWindow会用到；
// Show only these settings for restricted users
private int[] SETTINGS_FOR_RESTRICTED = {
R.id.wireless_section,
R.id.wifi_settings,
R.id.bluetooth_settings,
......
R.id.home_settings,
R.id.dashboard,
R.id.power_settings,
R.id.hotknot_settings
};
private static final String[] ENTRY_FRAGMENTS = {
WirelessSettings.class.getName(),
WifiSettings.class.getName(),
AdvancedWifiSettings.class.getName(),
......
HotKnotSettings.class.getName(),
AudioProfileSettings.class.getName(),
WfdSinkSurfaceFragment.class.getName(),
WifiGprsSelector.class.getName(),
SoundEnhancement.class.getName(),
};
15、宏SETTINGS_FOR_RESTRICTED是显示板上的资源id，ENTRY_FRAGMENTS是保存的fragment的名称，对外公布的名称；
private static final String[] LIKE_SHORTCUT_INTENT_ACTION_ARRAY = {
"android.settings.APPLICATION_DETAILS_SETTINGS"
};
16、是从launcher界面传过来的数组字段；
二、继续一，来分析一个类：SettingsActivity.java中的onCreate方法；
@Override
protected void onCreate(Bundle savedState) {
super.onCreate(savedState);
mExt = UtilsExt.getMiscPlugin(this);//通过插件获取ISettingsMiscExt对象
mIsWifiOnly = Utils.isWifiOnly(this);//判断是否只支持wifi;
// Should happen before any call to getIntent()
getMetaData();//获取mFragmentClass的名称，也就是需要显示的fragment名称
final Intent intent = getIntent();//获取intent对象，
if (intent.hasExtra(EXTRA_UI_OPTIONS)) {//判断是否需要设置uiOptions值
getWindow().setUiOptions(intent.getIntExtra(EXTRA_UI_OPTIONS, 0));
}
mDevelopmentPreferences = getSharedPreferences(DevelopmentSettings.PREF_FILE,
Context.MODE_PRIVATE);
//初始化的fragment的名称
// Getting Intent properties can only be done after the super.onCreate(...)
final String initialFragmentName = intent.getStringExtra(EXTRA_SHOW_FRAGMENT);
//获取是否有从launcher快捷方式传过来的字段属性值
mIsShortcut = isShortCutIntent(intent) || isLikeShortCutIntent(intent)
|| intent.getBooleanExtra(EXTRA_SHOW_FRAGMENT_AS_SHORTCUT, false);
//组装获取className
final ComponentName cn = intent.getComponent();
final String className = cn.getClassName();
//是否需要显示仪表板，也就是设置中的选项主界面；
mIsShowingDashboard = className.equals(Settings.class.getName());
１、上面这一段，基本上都是初始化的一些信息；
// This is a "Sub Settings" when:
// - this is a real SubSettings
// - or :settings:show_fragment_as_subsetting is passed to the Intent
//获取是否有子设置的fragment传递过来
final boolean isSubSettings = className.equals(SubSettings.class.getName()) ||
intent.getBooleanExtra(EXTRA_SHOW_FRAGMENT_AS_SUBSETTING, false);
// If this is a sub settings, then apply the SubSettings Theme for the ActionBar content insets
//如果有显示子设置，则获取主题资源id,并设置子设置的主题资源
if (isSubSettings) {
// Check also that we are not a Theme Dialog as we don't want to override the
final int themeResId = getThemeResId();
if (themeResId != R.style.Theme_DialogWhenLarge &&
themeResId != R.style.Theme_SubSettingsDialogWhenLarge) {
setTheme(R.style.Theme_SubSettings);
}
}
//是显示仪表板选项界面，还是加载的fragment界面
setContentView(mIsShowingDashboard ? R.layout.settings_main_dashboard :
R.layout.settings_main_prefs);
//此视图是加载
fragment的 mContent = (ViewGroup) findViewById(R.id.main_content);
getFragmentManager().addOnBackStackChangedListener(this);
//更新index
if (mIsShowingDashboard) {
Index.getInstance(getApplicationContext()).update();
}
２、代码加载布局资源；
if (savedState != null) {
// We are restarting from a previous saved state; used that to initialize, instead
// of starting fresh.
mSearchMenuItemExpanded = savedState.getBoolean(SAVE_KEY_SEARCH_MENU_EXPANDED);
mSearchQuery = savedState.getString(SAVE_KEY_SEARCH_QUERY);
setTitleFromIntent(intent);
ArrayList<DashboardCategory> categories =
savedState.getParcelableArrayList(SAVE_KEY_CATEGORIES);
if (categories != null) {
mCategories.clear();
mCategories.addAll(categories);
setTitleFromBackStack();
}
mDisplayHomeAsUpEnabled = savedState.getBoolean(SAVE_KEY_SHOW_HOME_AS_UP);
mDisplaySearch = savedState.getBoolean(SAVE_KEY_SHOW_SEARCH);
mHomeActivitiesCount = savedState.getInt(SAVE_KEY_HOME_ACTIVITIES_COUNT,
1 /* one home activity by default */);
}
３、以上是比较简单的，获取从intent获取值；如果savestate不为null的情况下；
} else {
if (!mIsShowingDashboard) {//是否显示仪表板，也就是选项板，否：进入if
// Search is shown we are launched thru a Settings "shortcut". UP will be shown
// only if it is a sub settings
if (mIsShortcut) {
mDisplayHomeAsUpEnabled = isSubSettings;
mDisplaySearch = false;
} else if (isSubSettings) {
mDisplayHomeAsUpEnabled = true;
mDisplaySearch = true;
} else {
mDisplayHomeAsUpEnabled = false;
mDisplaySearch = false;
}
setTitleFromIntent(intent);
//获取fragment并设置它
Bundle initialArguments = intent.getBundleExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS);
switchToFragment(initialFragmentName, initialArguments, true, false,
mInitialTitleResId, mInitialTitle, false);
} else {
// No UP affordance if we are displaying the main Dashboard
mDisplayHomeAsUpEnabled = false;
// Show Search affordance
mDisplaySearch = true;
mInitialTitleResId = R.string.dashboard_title;//显示仪表板
switchToFragment(DashboardSummary.class.getName(), null, false, false,
mInitialTitleResId, mInitialTitle, false);
}
} } else {
if (!mIsShowingDashboard) {//是否显示仪表板，也就是选项板，否：进入if
// Search is shown we are launched thru a Settings "shortcut". UP will be shown
// only if it is a sub settings
if (mIsShortcut) {
mDisplayHomeAsUpEnabled = isSubSettings;
mDisplaySearch = false;
} else if (isSubSettings) {
mDisplayHomeAsUpEnabled = true;
mDisplaySearch = true;
} else {
mDisplayHomeAsUpEnabled = false;
mDisplaySearch = false;
}
setTitleFromIntent(intent);
//获取fragment并设置它
Bundle initialArguments = intent.getBundleExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS);
switchToFragment(initialFragmentName, initialArguments, true, false,
mInitialTitleResId, mInitialTitle, false);
} else {
// No UP affordance if we are displaying the main Dashboard
mDisplayHomeAsUpEnabled = false;
// Show Search affordance
mDisplaySearch = true;
mInitialTitleResId = R.string.dashboard_title;//显示仪表板
switchToFragment(DashboardSummary.class.getName(), null, false, false,
mInitialTitleResId, mInitialTitle, false);
}
}
４、上面就是做了一件事情，显示相应的fragment；默认显示DashboardSummary.java类；
mActionBar = getActionBar();
if (mActionBar != null) {
mActionBar.setDisplayHomeAsUpEnabled(mDisplayHomeAsUpEnabled);
mActionBar.setHomeButtonEnabled(mDisplayHomeAsUpEnabled);
}
mSwitchBar = (SwitchBar) findViewById(R.id.switch_bar);
５、初始化上面的actionBar,也就是设置中的状态栏；
// see if we should show Back/Next buttons，这是第一次开机需要联网进入的设置界面，由外部传入的
if (intent.getBooleanExtra(EXTRA_PREFS_SHOW_BUTTON_BAR, false)) {
View buttonBar = findViewById(R.id.button_bar);
if (buttonBar != null) {
buttonBar.setVisibility(View.VISIBLE);
Button backButton = (Button)findViewById(R.id.back_button);
backButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
setResult(RESULT_CANCELED, getResultIntentData());
finish();
}
});
Button skipButton = (Button)findViewById(R.id.skip_button);
skipButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
setResult(RESULT_OK, getResultIntentData());
finish();
}
});
mNextButton = (Button)findViewById(R.id.next_button);
mNextButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
setResult(RESULT_OK, getResultIntentData());
finish();
}
});
// set our various button parameters
if (intent.hasExtra(EXTRA_PREFS_SET_NEXT_TEXT)) {
String buttonText = intent.getStringExtra(EXTRA_PREFS_SET_NEXT_TEXT);
if (TextUtils.isEmpty(buttonText)) {
mNextButton.setVisibility(View.GONE);
}
else {
mNextButton.setText(buttonText);
}
}
if (intent.hasExtra(EXTRA_PREFS_SET_BACK_TEXT)) {
String buttonText = intent.getStringExtra(EXTRA_PREFS_SET_BACK_TEXT);
if (TextUtils.isEmpty(buttonText)) {
backButton.setVisibility(View.GONE);
}
else {
backButton.setText(buttonText);
}
}
if (intent.getBooleanExtra(EXTRA_PREFS_SHOW_SKIP, false)) {
skipButton.setVisibility(View.VISIBLE);
}
}
}
//获取HomeActivity的个数
mHomeActivitiesCount = getHomeActivitiesCount();
}
６、显示上一步、下一步的代码多，这里不做讨论；
/**
* Called when the activity needs its list of categories/tiles built.
*
* @param categories The list in which to place the tiles categories.
*/
private void buildDashboardCategories(List<DashboardCategory> categories) {
categories.clear()；//清空仪表板上的选项
//加载dashboard_categories.xml文件中的选项
loadCategoriesFromResource(R.xml.dashboard_categories, categories);
//根据判断加载list选项
updateTilesList(categories);
}
７、这个方法就是加载仪表板上的显示内容；
三、下面来分析配置文件：dashboard_categories.xml
<!-- WIRELESS and NETWORKS 无线和网络-->
<dashboard-category
android:id="@+id/wireless_section"
android:title="@string/header_category_wireless_networks" >
<!-- Wifi Wi-Fi-->
<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"
/>
<!--HetComm 涡轮下载-->
<dashboard-tile
android:id="@+id/hetcomm_settings"
android:icon="@drawable/ic_settings_hetcomm"
android:title="@string/hetcom_setting_title">
<intent android:action="com.android.settings.HETCOMM_SETTINGS" />
</dashboard-tile>
<!-- Bluetooth 蓝牙-->
<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"
/>
<!-- Hotknot 热点-->
<dashboard-tile
android:id="@+id/hotknot_settings"
android:title="@string/hotknot_settings_title"
android:fragment="com.mediatek.settings.hotknot.HotKnotSettings"
android:icon="@drawable/ic_settings_hotknot"
/>
<!-- SIM Cards SIM卡-->
<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 流量使用情况-->
<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 更多-->
<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>
１、设置“无线与网络的”选项的仪表板；
<!-- DEVICE 设备-->
<dashboard-category
android:id="@+id/device_section"
android:title="@string/header_category_device" >
<!-- Home 主屏幕-->
<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 显示-->
<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 提示音和通知-->
<dashboard-tile
android:id="@+id/notification_settings"
android:title="@string/notification_settings"
android:fragment="com.mediatek.audioprofile.AudioProfileSettings"
android:icon="@drawable/ic_settings_notifications"
/>
<!-- Storage 存储-->
<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 电池-->
<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 应用-->
<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 用户-->
<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 触碰付款-->
<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 个人-->
<dashboard-category
android:id="@+id/personal_section"
android:title="@string/header_category_personal" >
<!-- Location 位置信息-->
<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 安全-->
<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 账户-->
<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 语言和输入法-->
<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 备份和重置-->
<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 系统-->
<dashboard-category
android:id="@+id/system_section"
android:title="@string/header_category_system" >
<!-- Date & Time 日期与时间-->
<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"
/>
<!--Scheduled power on&off 定时开关机-->
<dashboard-tile
android:id="@+id/power_settings"
android:icon="@drawable/ic_settings_schpwronoff"
android:title="@string/schedule_power_on_off_settings_title">
<intent android:action="com.android.settings.SCHEDULE_POWER_ON_OFF_SETTING" />
</dashboard-tile>
<!-- Accessibility feedback 无障碍-->
<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 打印-->
<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 开发者选项-->
<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 关于手机-->
<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>
２、以上就是dashboard_categories.xml文件的列举＋刷文字，在res/xml/dashboard_categories.xml；
四、来看看两个布局文件：settings_main_dashboard.xml和settings_main_prefs.xml
１、settings_main_dashboard.xml文件布局如下：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main_content"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="@color/dashboard_background_color"
/>
２、settings_main_prefs.xml文件布局如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="match_parent"
android:layout_width="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_height="0px"
android:layout_width="match_parent"
android:layout_weight="1">
<com.android.settings.widget.SwitchBar android:id="@+id/switch_bar"
android:layout_height="?android:attr/actionBarSize"
android:layout_width="match_parent"
android:background="@drawable/switchbar_background"
android:theme="?attr/switchBarTheme"
/>
<FrameLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/preferenceBackgroundColor"
/>
</LinearLayout>
<RelativeLayout android:id="@+id/button_bar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_weight="0"
android:visibility="gone">
<Button android:id="@+id/back_button"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:layout_alignParentStart="true"
android:text="@*android:string/back_button_label"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true">
<Button android:id="@+id/skip_button"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:text="@*android:string/skip_button_label"
android:visibility="gone"
/>
<Button android:id="@+id/next_button"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:text="@*android:string/next_button_label"
/>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
至此，设置界面的主界面和布局文件加载的分析，可以说告一段落；下次继续分析仪表板上的每一个选项的内容
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