知识点一：Settings默认值设置（一）

储备的知识：

在 \frameworks\base\packages\SettingsProvider\res\values\defaults.xml 文件里定义的开关 如下：

    <bool name="def_dim_screen">true</bool>                自动关屏        开

    <integer name="def_screen_off_timeout">60000</integer>    自动关屏幕时间    1分钟
    <bool name="def_airplane_mode_on">false</bool>     飞行模式        关

    <!-- 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>

    <bool name="def_auto_time">true</bool>              自动适应时间   开

    <bool name="def_auto_time_zone">true</bool>
    <bool name="def_accelerometer_rotation">true</bool>   

    <integer name="def_screen_brightness">102</integer>
    <bool name="def_screen_brightness_automatic_mode">true</bool>    自动亮度调节

    <fraction name="def_window_animation_scale">0%</fraction>
    <fraction name="def_window_transition_scale">0%</fraction>
    <bool name="def_haptic_feedback">false</bool>                    触动反馈  关
    <bool name="def_bluetooth_on">false</bool>                       蓝牙    关

    <bool name="def_wifi_display_on">false</bool>
    <bool name="def_install_non_market_apps">false</bool>             安装非市场apk      关

    <bool name="def_package_verifier_enable">true</bool>

    <string name="def_location_providers_allowed" translatable="false"></string>
    <bool name="assisted_gps_enabled">true</bool>                     gps定位         关

    <bool name="def_netstats_enabled">true</bool>
    <bool name="def_usb_mass_storage_enabled">true</bool>             usb存储模式    开
    <bool name="def_wifi_on">false</bool>                             wifi      关

    <integer name="def_wifi_sleep_policy">2</integer>
    <bool name="def_networks_available_notification_on">true</bool>   
    <bool name="def_backup_enabled">true</bool>                       保存             开

    <string name="def_backup_transport" translatable="false">android/com.android.internal.backup.LocalTransport</string>
    <bool name="def_notification_pulse">true</bool>                   震动提醒        开
    <bool name="def_mount_play_notification_snd">false</bool>         
    <bool name="def_mount_ums_autostart">false</bool>                  自动重启        关
    <bool name="def_mount_ums_prompt">true</bool>
    <bool name="def_mount_ums_notify_enabled">true</bool>

    <integer name="def_power_sounds_enabled">1</integer>                低电量声音     开

    <string name="def_low_battery_sound" translatable="false">/system/media/audio/ui/LowBattery.ogg</string>

    <integer name="def_dock_sounds_enabled">0</integer>   

    <string name="def_desk_dock_sound" translatable="false">/system/media/audio/ui/Dock.ogg</string>
    <string name="def_desk_undock_sound" translatable="false">/system/media/audio/ui/Undock.ogg</string>
    <string name="def_car_dock_sound" translatable="false">/system/media/audio/ui/Dock.ogg</string>
    <string name="def_car_undock_sound" translatable="false">/system/media/audio/ui/Undock.ogg</string>

    <integer name="def_lockscreen_sounds_enabled">0</integer>               锁屏声音      关

    <string name="def_lock_sound" translatable="false">/system/media/audio/ui/Lock.ogg</string>
    <string name="def_unlock_sound" translatable="false">/system/media/audio/ui/Unlock.ogg</string>
    <string name="def_wireless_charging_started_sound" translatable="false">/system/media/audio/ui/WirelessChargingStarted.ogg</string>
    <bool name="carrier_sim_name_enabled">false</bool>
    <bool name="def_lockscreen_disabled">false</bool>

    <bool name="def_device_provisioned">true</bool>                 设置提供

    <integer name="def_dock_audio_media_enabled">1</integer>

    <bool name="def_notifications_use_ring_volume">true</bool>         声音提醒         开
    <bool name="def_vibrate_in_silent">true</bool>                   无声震动
    <bool name="def_accessibility_script_injection">false</bool>

    <bool name="def_accessibility_speak_password">false</bool>

    <string name="def_time_12_24">24</string>                                设置时间格式  24小时制还是12小时制
    <!-- Default screen brightness, from 0 to 255.  102 is 40%. -->
    <integer name="def_screen_brightness">216</integer>                 屏幕亮度
    <integer name="def_network_preference">1</integer>                  网络默认选择    第一项

    <string name="def_accessibility_web_content_key_bindings" translatable="false">
            <!-- DPAD/Trackball UP - traverse previous on current axis and send an event. -->
            0x13=0x01000100;
            <!-- DPAD/Trackball DOWN - traverse next on current axis and send an event. -->
            0x14=0x01010100;
            <!-- DPAD/Trackball LEFT - traverse previous on the character navigation axis and send event. -->
            0x15=0x02000001;
            <!-- DPAD/Trackball RIGHT - traverse next on the character navigation axis end send event. -->
            0x16=0x02010001;
            <!-- Alt+DPAD/Trackball UP - go to the top of the document. -->
            0x200000013=0x02000601;
            <!-- Alt+DPAD/Trackball DOWN - go to the bottom of the document. -->
            0x200000014=0x02010601;
            <!-- Alt+DPAD/Trackball LEFT - transition from an axis to another and sends an event.-->
            <!-- Axis transitions: 2 -> 1; -->
            0x200000015=0x03020101;
            <!-- Alt+DPAD/Trackball RIGHT - transition from an axis to another and sends an event. -->
            <!-- Axis transitions:  1 -> 2; -->
            0x200000016=0x03010201;
            <!-- Alt+g - go to the previous heading and send an event. -->
            0x200000023=0x02000301;
            <!-- Alt+h - go to the next heading and send an event. -->
            0x200000024=0x02010301;
            <!-- Alt+COMMA - transition to sentence navigation axis and send an event. -->
            <!-- Axis transitions:  7 -> 2; -->
            0x200000037=0x03070201;
            <!-- Alt+PERIOD - transition to default web view behavior axis and send an event. -->
            <!-- Axis transitions:  0 -> 7; 1 - > 7; 2 -> 7; -->
            0x200000038=0x03000701:0x03010701:0x03020701;
    </string>

<!-- Default for Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION_URL -->
    <string name="def_accessibility_screen_reader_url" translatable="false">
        https://ssl.gstatic.com/accessibility/javascript/android/AndroidVox_v1.js
    </string>


    <!-- Default for Settings.Secure.TOUCH_EXPLORATION_ENABLED -->
    <bool name="def_touch_exploration_enabled">false</bool>


    <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE -->
    <fraction name="def_accessibility_display_magnification_scale">200%</fraction>


    <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED -->
    <bool name="def_accessibility_display_magnification_enabled">false</bool>


    <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_AUTO_UPDATE -->
    <bool name="def_accessibility_display_magnification_auto_update">true</bool>


    <!-- Default for Settings.System.USER_ROTATION -->
    <integer name="def_user_rotation">0</integer>


    <!-- Default for Settings.Secure.DOWNLOAD_MAX_BYTES_OVER_MOBILE. <=0 if no limit -->
    <integer name="def_download_manager_max_bytes_over_mobile">-1</integer>
    <!-- Default for Settings.Secure.DOWNLOAD_RECOMMENDED_MAX_BYTES_OVER_MOBILE. <=0 if no limit -->
    <integer name="def_download_manager_recommended_max_bytes_over_mobile">-1</integer>


    <!-- Default for Settings.Secure.LONG_PRESS_TIMEOUT_MILLIS -->
    <integer name="def_long_press_timeout_millis">500</integer>


    <!-- Default for Settings.System.POINTER_SPEED -->
    <integer name="def_pointer_speed">0</integer>


    <!-- Default for DTMF tones enabled -->
    <bool name="def_dtmf_tones_enabled">true</bool>
    <!-- Default for UI touch sounds enabled -->
    <bool name="def_sound_effects_enabled">true</bool>


    <!-- Development settings -->
    <bool name="def_stay_on_while_plugged_in">false</bool>


    <!-- Number of retries for connecting to DHCP.
         Value here is the same as WifiStateMachine.DEFAULT_MAX_DHCP_RETRIES -->
    <integer name="def_max_dhcp_retries">9</integer>


    <!-- Default for Settings.Secure.USER_SETUP_COMPLETE -->
    <bool name="def_user_setup_complete">false</bool>


    <!-- Default for Settings.Global.LOW_BATTERY_SOUND_TIMEOUT.
         0 means no timeout; battery sounds will always play
         >0 is milliseconds of screen-off time after which battery sounds will not play -->
    <integer name="def_low_battery_sound_timeout">0</integer>

    <!-- Default for time mode 12 or 24 pattern -->
    
    
                     
    

备注:

此数据库由:frameworks\base\packages\SettingsProvider\src\com\android\providers\settings\DatabaseHelper.java 创建,

其默认初始值位置:frameworks\base\packages\SettingsProvider\res\values\defaults.xml