android第一次启动时Settings的默认值

我的环境是基于msm8x12的android4.3。

在做android系统时，每个公司对其都有其自己的定制，比如默认用什么输入法，用什么语言，是否开启ADB调试等，这些当你第一次开机的时候，都会获取这些默认值然后去设置。那么这些放在哪呢，如何去操作呢？

msm8x12\frameworks\base\core\java\android\provider下方的就是数据库操作封装，Android系统提供大量的SettingsProvider，除本处说的Settings，常用的还有管理联系人（ContactsContract）、多媒体数据（MediaStore）等。

对于如何使用，就是在你封装的SettingsProvider中使用Settings.System.putXXX()；Settings.System.getXXX()来进行设置和查询。

对于我们此处要说的Settings，它的默认值在frameworks/base/packages/SettingsProvider/res/values/defaults.xml

这些默认值只是一些整数值或者字符串（第一次开机要用到的值用于初始化数据库，等数据库形成了，这些值就没用了）。

如何将其存到数据库呢，在frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java

就是对defaults.xml所有初始值的进行初始化数据库，每一个值都存于一个对应的属性中。

对于要设置的属性定义在哪？

在frameworks/base/packages/SettingsProvider/src/com/android/providers/Settings.java定义，都是字符串常量。这样数据库中就形成了“属性--值”这样的映射存储。

在DatabaseHelper.java中的onCreate加载音量默认值，系统设置默认值，大概如下，

    public void onCreate(SQLiteDatabase db) {...        // Load initial volume levels into DB        loadVolumeLevels(db);//电话音量，铃声音量，系统音量默认值初始化到数据库        // Load inital settings values        loadSettings(db);//系统相关默认值初始化到数据库}    private void loadSettings(SQLiteDatabase db) {        loadSystemSettings(db);//基本系统设置默认值加载        loadEnhancedSystemSettings(db);//系统增强功能默认值加载        loadSecureSettings(db);//有关系统安全的默认值加载        // The global table only exists for the 'owner' user        if (mUserHandle == UserHandle.USER_OWNER) {//面向拥有者的全局系统设置默认值加载            loadGlobalSettings(db);            loadEnhancedGlobalSettings(db);        }    }

设置中的默认值除了在defaults.xml中，还有customize.xml,只要在设置中设置完重启后能保存状态的基本都是数据库存储。

customize.xml值的意义：

1)def_custom_sys_volume，bool

是否启用自定义各种音频源，如果为false就会用默认的值，定义在frameworks\base\media\java\android\media\AudioManager.java

    /**  @hide Default volume index values for audio streams */    public static final int[] DEFAULT_STREAM_VOLUME = new int[] {        4,  // STREAM_VOICE_CALL        7,  // STREAM_SYSTEM        5,  // STREAM_RING        11, // STREAM_MUSIC        6,  // STREAM_ALARM        5,  // STREAM_NOTIFICATION        7,  // STREAM_BLUETOOTH_SCO        7,  // STREAM_SYSTEM_ENFORCED        11, // STREAM_DTMF        11,  // STREAM_TTS        4   // STREAM_INCALL_MUSIC    };

如果为true，那么就会用defaults.xml接下来的def_ringtone_volume，def_music_volume等值进行初始化数据库

2)def_time_format，string

时间格式，取值：12或者24

3)def_date_format，string

日期格式，取值：mm/dd/yyyy，dd/mm/yyyy，yyyy/mm/dd

4)def_input_method，string

默认使用的输入法， Default Input Method, its value is from inputmethod's package name and main class name such as "com.android.inputmethod.pinyin/.PinyinIME"

5)def_enable_input_methods，string

使能的输入法，可以有多个，用冒号：分割。一般如下如何来定制系统默认使用的输入法

loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS, R.string.def_enable_input_methods);

loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD, R.string.def_input_method);

6)def_enable_data_roaming，bool

数据漫游开关

7)def_enable_mobile_data,bool

移动数据开关关

例子：

以设置默认输入法为例，

a)在上述defaults.xml中添加新默认值

com.dwime.lds_for_seuic/.XFMIme

当然如果已经存在某个name了，那么直接改值即可，上述值面对不同输入法是不同，比如默认英文输入法就改为值com.android.inputmethod.latin/.LatinIME，默认百度输入法该值为com.baidu.input/.ImeService，你安装完输入法可以在设备的shell中使用ime list -s命令来看到该值。

b)在上述DatabaseHelper.java中的loadSecureSettings()函数中添加（其他loadXXX中添加当然也可以）

loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS, R.string.def_input_method);

loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD, R.string.def_input_method);

这样建立起数据库，属性为ENABLED_INPUT_METHODS设置完后，这样在安卓settings中，对应的输入法是打钩的，设置多个就打钩多个；属性为DEFAULT_INPUT_METHOD设置完后，其对应的输入法就是为默认的输入法了。当然你也可以在DatabaseHelper.java中直接去设置，而不再defaults.xml中放默认值，最好不要这样做。

其它属性：

不管下面是BOOL（0或者1）还是INT最终都是转为string存储的。

全名为Settings.System.XXXX,以下皆省略除XXXX以外的字符

1)DIM_SCREEN

BOOL; @Deprecated; Whether or not to dim the screen; 0=no 1=yes

2)SCREEN_OFF_TIMEOUT

INT; The timeout in milliseconds before the screen turns off

3)SCREEN_BRIGHTNESS

INT; The screen backlight brightness between 0 and 255

4)SCREEN_BRIGHTNESS_MODE

BOOL; Control whether to enable automatic brightness mode; 0=manual,1=auto

5)ACCELEROMETER_ROTATION

BOOL; Control whether the accelerometer will be used to change screen orientation; 0= 默认禁用旋转，除非应用明确使用，1=默认自动旋转，除非应用明确禁用

6)HAPTIC_FEEDBACK_ENABLED

BOOL; Whether the haptic feedback (long presses, ...) are enabled[触觉反馈]; 0=disable,1=enable

7)NOTIFICATION_LIGHT_PULSE

BOOL; Whether the notification LED should repeatedly flash when a notification is pending

8)DTMF_TONE_WHEN_DIALING

BOOL; Whether the audible DTMF tones are played by the dialer when dialing

9)SOUND_EFFECTS_ENABLED

BOOL; Whether the sounds effects (key clicks, lid open ...) are enabled

10)LOCKSCREEN_SOUNDS_ENABLED

INT; Whether to play sounds when the keyguard is shown and dismissed.

全名为Settings.Secure.XXXX,以下皆省略XXXX以外的字符

这部分数据库的访问为Settings.secure.put/getXXX

1)LOCATION_PROVIDERS_ALLOWED

String; Comma-separated list of location providers that activities may access; "network"仅基站定位,"gps"仅GPS定位,"network,gps"基站、GPS都开放, ""关闭定位

2)ADB_ENABLED

            // Don't do this.  The SystemServer will initialize ADB_ENABLED from a            // persistent system property instead.            //loadSetting(stmt, Settings.Secure.ADB_ENABLED, 0);

在我的android4.3系统中，使用persist.sys.usb.config属性中增加"adb"值即默认打开adb，不再使用ADB_ENABLE属性直接初始化数据库了。

3)LONG_PRESS_TIMEOUT

INT; The timout for considering a press to be a long press in milliseconds.

4)LOCKSCREEN_DISABLED

BOOL; Whether the lockscreen should be completely disabled

            if (SystemProperties.getBoolean("ro.lockscreen.disable.default", false) == true) {                loadSetting(stmt, Settings.System.LOCKSCREEN_DISABLED, "1");            } else {                loadBooleanSetting(stmt, Settings.System.LOCKSCREEN_DISABLED,                        R.bool.def_lockscreen_disabled);            }

ro.lockscreen.disable.default属性优先于默认值的。

5)ENABLED_INPUT_METHODS

String; List of input methods that are currently enabled,This is a string containing the IDs of all enabled input methods, each ID separated by ':'

6)DEFAULT_INPUT_METHOD

String; Setting to record the input method used by default, holding the ID of the desired method.

全名为Settings.Global.XXXX,以下皆省略XXXX以外的字符

1)AIRPLANE_MODE_ON

BOOL; Whether Airplane Mode is on.

2)AIRPLANE_MODE_RADIOS

String; A comma separated list of radios that need to be disabled when airplane mode is on. This overrides WIFI_ON and BLUETOOTH_ON, if Wi-Fi and bluetooth are included in the comma separated list;

例如defaults.xml中有

cell,bluetooth,wifi,nfc,wimax

那么当飞行模式开启时，蜂窝网络，蓝牙，wifi，NFC，wimax都得关闭。

3)AIRPLANE_MODE_TOGGLEABLE_RADIOS

String; A comma separated list of radios that should to be disabled when airplane mode is on, but can be manually reenabled by the user

例如defaults.xml中有

 bluetooth,wifi,nfc

那么当飞行模式开启时，bluetooth,wifi,nfc会被关闭，但是可以由用户在settings app重新打开。

4)ASSISTED_GPS_ENABLED

BOOL; Whether assisted GPS should be enabled or not [AGPS是否打开]

5)AUTO_TIME

BOOL; Value to specify if the user prefers the date, time and time zone to be automatically fetched from the network (NITZ). 1=yes, 0=no

6)AUTO_TIME_ZONE

BOOL; Value to specify if the user prefers the time zone to be automatically fetched from the network (NITZ). 1=yes, 0=no

7)STAY_ON_WHILE_PLUGGED_IN

INT; Whether we keep the device on while the device is plugged in(eg:charger ofBATTERY_PLUGGED_AC,BATTERY_PLUGGED_USB,BATTERY_PLUGGED_WIRELESS)

8)WIFI_SLEEP_POLICY

INT; The policy for deciding when Wi-Fi should go to sleep (which will in turn switch to using the mobile data as an Internet connection);0 == never, 1 == only when plugged in, 2 == always

9)MODE_RINGER

INT; Ringer mode. This is used internally, changing this value will not change the ringer mode. See AudioManager

    /**     * Ringer mode that will be silent and will not vibrate. (This overrides the     * vibrate setting.)     *     * @see #setRingerMode(int)     * @see #getRingerMode()     */    public static final int RINGER_MODE_SILENT = 0;    /**     * Ringer mode that will be silent and will vibrate. (This will cause the     * phone ringer to always vibrate, but the notification vibrate to only     * vibrate if set.)     *     * @see #setRingerMode(int)     * @see #getRingerMode()     */    public static final int RINGER_MODE_VIBRATE = 1;    /**     * Ringer mode that may be audible and may vibrate. It will be audible if     * the volume before changing out of this mode was audible. It will vibrate     * if the vibrate setting is on.     *     * @see #setRingerMode(int)     * @see #getRingerMode()     */    public static final int RINGER_MODE_NORMAL = 2;

10)WIFI_ON

BOOL; Whether the Wi-Fi should be on. Only the Wi-Fi service should touch this

11)BLUETOOTH_ON

BOOL; Whether bluetooth is enabled/disabled

12)MOBILE_DATA/DATA_ROAMING

BOOL; [数据连接/漫游]

13)INSTALL_NON_MARKET_APPS

BOOL; Whether the package installer should allow installation of apps downloaded from sources other than Google Play,0=only google play,1=other source

14)USB_MASS_STORAGE_ENABLED

BOOL; USB Mass Storage Enabled

15)LOCK_SOUND/UNLOCK_SOUND

String; URI for the "device locked" (keyguard shown) sound/URI for the "device unlocked" sound

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