1、写在前面

不同的产品开发有不同的需求对于默认的时间

2设置默认8时区和默认24小时制的核心类

build/make/tools/buildinfo_common.sh
framework/base/packages/apps/SettingsProvider/res/values/defaults.xml
framework/base/packages/apps/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java 	

3.设置默认时区的功能实现

在buildinfo_common.sh 中添加时区属性persist.sys.timezone
android 默认时区 为GMT 0时区，默认设置为北京或者上海

#!/bin/bashpartition="$1"if [ "$#" -ne 1 ]; thenecho "Usage: $0 <partition>" 1>&2exit 1fiecho "# begin common build properties"echo "# autogenerated by $0"echo "ro.${partition}.build.date=`$DATE`"echo "ro.${partition}.build.date.utc=`$DATE +%s`"echo "ro.${partition}.build.fingerprint=$BUILD_FINGERPRINT"echo "ro.${partition}.build.id=$BUILD_ID"echo "ro.${partition}.build.tags=$BUILD_VERSION_TAGS"echo "ro.${partition}.build.type=$TARGET_BUILD_TYPE"echo "ro.${partition}.build.version.incremental=$BUILD_NUMBER"echo "ro.${partition}.build.version.release=$PLATFORM_VERSION_LAST_STABLE"echo "ro.${partition}.build.version.release_or_codename=$PLATFORM_VERSION"echo "ro.${partition}.build.version.sdk=$PLATFORM_SDK_VERSION"echo "ro.product.${partition}.brand=$PRODUCT_BRAND"echo "ro.product.${partition}.device=$PRODUCT_DEVICE"echo "ro.product.${partition}.manufacturer=$PRODUCT_MANUFACTURER"echo "ro.product.${partition}.model=$PRODUCT_MODEL"echo "ro.product.${partition}.name=$PRODUCT_NAME"
+ echo "persist.sys.timezone=Asia/Shanghai"echo "# end common build properties"

4、在SettingsProvider的defaults.xml中添加24小时的系统属性值

   <resources><bool name="def_dim_screen">true</bool><integer name="def_screen_off_timeout">300000</integer><integer name="def_sleep_timeout">-1</integer><bool name="def_airplane_mode_on">false</bool><bool name="def_theater_mode_on">false</bool><!-- Comma-separated list of bluetooth, wifi, and cell. --><string name="def_airplane_mode_radios" translatable="false">cell,bluetooth,wifi,nfc,wimax</string><string name="airplane_mode_toggleable_radios" translatable="false">bluetooth,wifi,nfc</string><string name="def_bluetooth_disabled_profiles" translatable="false">0</string><bool name="def_auto_time">true</bool><bool name="def_auto_time_zone">true</bool>+ <string name="def_time_12_24">24</string><bool name="def_accelerometer_rotation">false</bool><!-- Default screen brightness, from 0 to 255.  102 is 40%. --><integer name="def_screen_brightness">102</integer><bool name="def_screen_brightness_automatic_mode">false</bool><fraction name="def_window_animation_scale">100%</fraction><fraction name="def_window_transition_scale">100%</fraction><bool name="def_haptic_feedback">true</bool><integer name="def_show_battery_percent">1</integer><bool name="def_bluetooth_on">false</bool><bool name="def_wifi_display_on">false</bool><bool name="def_install_non_market_apps">false</bool><!-- 0 == off, 3 == on --><integer name="def_location_mode">3</integer><bool name="assisted_gps_enabled">true</bool><bool name="def_netstats_enabled">true</bool><bool name="def_usb_mass_storage_enabled">true</bool><bool name="def_wifi_on">false</bool><!-- 0 == never, 1 == only when plugged in, 2 == always --><integer name="def_wifi_sleep_policy">2</integer><bool name="def_wifi_wakeup_enabled">true</bool><bool name="def_networks_available_notification_on">true</bool>...</resources>

5、在DatabaseHelper.java中设置默认时间属性

  private void loadSystemSettings(SQLiteDatabase db) {SQLiteStatement stmt = null;try {stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)"+ " VALUES(?,?);");loadBooleanSetting(stmt, Settings.System.DIM_SCREEN,R.bool.def_dim_screen);loadIntegerSetting(stmt, Settings.System.SCREEN_OFF_TIMEOUT,R.integer.def_screen_off_timeout);// Set default cdma DTMF typeloadSetting(stmt, Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, 0);+      loadStringSetting(stmt, Settings.System.TIME_12_24, R.string.def_time_12_24);// Set default hearing aidloadSetting(stmt, Settings.System.HEARING_AID, 0);// Set default tty modeloadSetting(stmt, Settings.System.TTY_MODE, 0);loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS,R.integer.def_screen_brightness);loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_FOR_VR,com.android.internal.R.integer.config_screenBrightnessForVrSettingDefault);loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE,R.bool.def_screen_brightness_automatic_mode);loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,R.bool.def_accelerometer_rotation);loadDefaultHapticSettings(stmt);loadBooleanSetting(stmt, Settings.System.NOTIFICATION_LIGHT_PULSE,R.bool.def_notification_pulse);loadUISoundEffectsSettings(stmt);loadIntegerSetting(stmt, Settings.System.POINTER_SPEED,R.integer.def_pointer_speed);loadIntegerSetting(stmt, Settings.System.SHOW_BATTERY_PERCENT, R.integer.def_show_battery_percent);/// M: Load MTK added System providers before Android M.mUtils.loadCustomSystemSettings(stmt);/** IMPORTANT: Do not add any more upgrade steps here as the global,* secure, and system settings are no longer stored in a database* but are kept in memory and persisted to XML.** See: SettingsProvider.UpgradeController#onUpgradeLocked*/} finally {if (stmt != null) stmt.close();}