查询/设置Settings的值
按计划每周更新一篇技术博文，第四篇：《查询/设置Settings的值
》
通常很多定制系统或者与系统相关的应用都需要查询/设置
Settings（设置）里边的值，比如系统亮度，休眠时间，锁屏之类的系统设置等，主要通过
SettingsProvider来查询/设置，前提是要知道所要修改的值的数据类型与字符串代表的name。
对应的name值与数据类型在./ics/frameworks/base/core/java/android/provider/Settings.java文件中,例举两个例子如下：
1.查询休眠时间：
/**
* 获取系统休眠时间
* @return 秒数(从不待机 返回0)
*/
public static String getTimeOut(ContentResolver resolver){
int timeOut = 0;
try {
timeOut = android.provider.Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS);
timeOut /= 1000;
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
String timeOutStr = timeOut + "";
return timeOutStr;
}2.更改系统亮度：
/**
* 保存亮度设置状态
* 改变setting值
* @param resolver
* @param brightness : 0~1
*/
public static void saveBrightness(ContentResolver resolver, float brightness) {
Uri uri = android.provider.Settings.System
.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS,
(int)(brightness*255));
resolver.notifyChange(uri, null);
}需要权限：
PS：
a.查询Settings中各个属性所对应的值（Android APIs）：http://developer.android.com/reference/android/provider/Settings.System.html
b.ContentResolver Context提供getContentResolver()方法可以获取ContentResolver对象，便可以操作文中前边所提的 SettingsProvider所暴露的数据。
c.Android系统提供大量的SettingsProvider，Settings除外，常用的还有管理联系人（ContactsContract）、短信（Telephony）、多媒体数据（MediaStore）等，对应的URI可到这里查看：http://developer.android.com/reference/android/provider/package-summary.html，源码路径：./ics/frameworks/base/core/java/android/provider/
d.Settings默认初始值的位置（修改之前最好弄明白先，修改后再测试一下）：
frameworks/base/packages/SettingsProvider/res/values/defaults.xml
=========================================================================
Android中的android.provider.Settings.System系统属性设定
Content Provider中的Setting.System表格内存储了很多系统属性的值，以键值对的形式存在！
可以对如下的变量进行设置
| Constants | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| String | ACCELEROMETER_ROTATION | Control whether the accelerometer will be used to change screen orientation. | |||||||||
| String | ADB_ENABLED | This constant is deprecated. Use ADB_ENABLED instead |
|||||||||
| String | AIRPLANE_MODE_ON | Whether Airplane Mode is on. | |||||||||
| String | AIRPLANE_MODE_RADIOS | A comma separated list of radios that need to be disabled when airplane mode is on. | |||||||||
| String | ALARM_ALERT | Persistent store for the system-wide default alarm alert. | |||||||||
| String | ALWAYS_FINISH_ACTIVITIES | If 1, the activity manager will aggressively finish activities and processes as soon as they are no longer needed. | |||||||||
| String | ANDROID_ID | This constant is deprecated. Use ANDROID_ID instead |
|||||||||
| String | APPEND_FOR_LAST_AUDIBLE | Appended to various volume related settings to record the previous values before they the settings were affected by a silent/vibrate ringer mode change. | |||||||||
| String | AUTO_TIME | Value to specify if the user prefers the date, time and time zone to be automatically fetched from the network (NITZ). | |||||||||
| String | AUTO_TIME_ZONE | Value to specify if the user prefers the time zone to be automatically fetched from the network (NITZ). | |||||||||
| String | BLUETOOTH_DISCOVERABILITY | Determines whether remote devices may discover and/or connect to this device. | |||||||||
| String | BLUETOOTH_DISCOVERABILITY_TIMEOUT | Bluetooth discoverability timeout. | |||||||||
| String | BLUETOOTH_ON | This constant is deprecated. Use BLUETOOTH_ON instead |
|||||||||
| String | DATA_ROAMING | This constant is deprecated. Use DATA_ROAMING instead |
|||||||||
| String | DATE_FORMAT | Date format string mm/dd/yyyy dd/mm/yyyy yyyy/mm/dd | |||||||||
| String | DEBUG_APP | Name of an application package to be debugged. | |||||||||
| String | DEVICE_PROVISIONED | This constant is deprecated. Use DEVICE_PROVISIONEDinstead |
|||||||||
| String | DIM_SCREEN | Whether or not to dim the screen. | |||||||||
| String | DTMF_TONE_WHEN_DIALING | Whether the audible DTMF tones are played by the dialer when dialing. | |||||||||
| String | END_BUTTON_BEHAVIOR | What happens when the user presses the end call button if they're not on a call. | |||||||||
| String | FONT_SCALE | Scaling factor for fonts, float. | |||||||||
| String | HAPTIC_FEEDBACK_ENABLED | Whether the haptic feedback (long presses, ...) are enabled. | |||||||||
| String | HTTP_PROXY | This constant is deprecated. Use HTTP_PROXY instead |
|||||||||
| String | INSTALL_NON_MARKET_APPS | This constant is deprecated. UseINSTALL_NON_MARKET_APPS instead |
|||||||||
| String | LOCATION_PROVIDERS_ALLOWED | This constant is deprecated. UseLOCATION_PROVIDERS_ALLOWED instead |
|||||||||
| String | LOCK_PATTERN_ENABLED | This constant is deprecated. Use LOCK_PATTERN_ENABLEDinstead |
|||||||||
| String | LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED | This constant is deprecated. UseLOCK_PATTERN_TACTILE_FEEDBACK_ENABLED instead |
|||||||||
| String | LOCK_PATTERN_VISIBLE | This constant is deprecated. Use LOCK_PATTERN_VISIBLEinstead |
|||||||||
| String | LOGGING_ID | This constant is deprecated. Use LOGGING_ID instead |
|||||||||
| String | MODE_RINGER | Ringer mode. | |||||||||
| String | MODE_RINGER_STREAMS_AFFECTED | Determines which streams are affected by ringer mode changes. | |||||||||
| String | MUTE_STREAMS_AFFECTED | Determines which streams are affected by mute. | |||||||||
| String | NETWORK_PREFERENCE | This constant is deprecated. Use NETWORK_PREFERENCEinstead |
|||||||||
| String | NEXT_ALARM_FORMATTED | A formatted string of the next alarm that is set, or the empty string if there is no alarm set. | |||||||||
| String | NOTIFICATION_SOUND | Persistent store for the system-wide default notification sound. | |||||||||
| String | PARENTAL_CONTROL_ENABLED | This constant is deprecated. UsePARENTAL_CONTROL_ENABLED instead |
|||||||||
| String | PARENTAL_CONTROL_LAST_UPDATE | This constant is deprecated. UsePARENTAL_CONTROL_LAST_UPDATE instead |
|||||||||
| String | PARENTAL_CONTROL_REDIRECT_URL | This constant is deprecated. UsePARENTAL_CONTROL_REDIRECT_URL instead |
|||||||||
| String | RADIO_BLUETOOTH | Constant for use in AIRPLANE_MODE_RADIOS to specify Bluetooth radio. | |||||||||
| String | RADIO_CELL | Constant for use in AIRPLANE_MODE_RADIOS to specify Cellular radio. | |||||||||
| String | RADIO_NFC | Constant for use in AIRPLANE_MODE_RADIOS to specify NFC radio. | |||||||||
| String | RADIO_WIFI | Constant for use in AIRPLANE_MODE_RADIOS to specify Wi-Fi radio. | |||||||||
| String | RINGTONE | Persistent store for the system-wide default ringtone URI. | |||||||||
| String | SCREEN_BRIGHTNESS | The screen backlight brightness between 0 and 255. | |||||||||
| String | SCREEN_BRIGHTNESS_MODE | Control whether to enable automatic brightness mode. | |||||||||
| int | SCREEN_BRIGHTNESS_MODE_AUTOMATIC | SCREEN_BRIGHTNESS_MODE value for automatic mode. | |||||||||
| int | SCREEN_BRIGHTNESS_MODE_MANUAL | SCREEN_BRIGHTNESS_MODE value for manual mode. | |||||||||
| String | SCREEN_OFF_TIMEOUT | The timeout before the screen turns off. | |||||||||
| String | SETTINGS_CLASSNAME | This constant is deprecated. Use SETTINGS_CLASSNAMEinstead |
|||||||||
| String | SETUP_WIZARD_HAS_RUN | Whether the setup wizard has been run before (on first boot), or if it still needs to be run. | |||||||||
| String | SHOW_GTALK_SERVICE_STATUS | ||||||||||
| String | SHOW_PROCESSES | Control whether the process CPU usage meter should be shown. | |||||||||
| String | SHOW_WEB_SUGGESTIONS | This constant is deprecated. Each application that shows web suggestions should have its own setting for this. | |||||||||
| String | SOUND_EFFECTS_ENABLED | Whether the sounds effects (key clicks, lid open ...) are enabled. | |||||||||
| String | STAY_ON_WHILE_PLUGGED_IN | Whether we keep the device on while the device is plugged in. | |||||||||
| String | SYS_PROP_SETTING_VERSION | ||||||||||
| String | TEXT_AUTO_CAPS | Setting to enable Auto Caps in text editors. | |||||||||
| String | TEXT_AUTO_PUNCTUATE | Setting to enable Auto Punctuate in text editors. | |||||||||
| String | TEXT_AUTO_REPLACE | Setting to enable Auto Replace (AutoText) in text editors. | |||||||||
| String | TEXT_SHOW_PASSWORD | Setting to showing password characters in text editors. | |||||||||
| String | TIME_12_24 | Display times as 12 or 24 hours 12 24 | |||||||||
| String | TRANSITION_ANIMATION_SCALE | Scaling factor for activity transition animations. | |||||||||
| String | USB_MASS_STORAGE_ENABLED | This constant is deprecated. UseUSB_MASS_STORAGE_ENABLED instead |
|||||||||
| String | USER_ROTATION | Default screen rotation when no other policy applies. | |||||||||
| String | USE_GOOGLE_MAIL | This constant is deprecated. Use USE_GOOGLE_MAILinstead |
|||||||||
| String | VIBRATE_ON | Whether vibrate is on for different events. | |||||||||
| String | VOLUME_ALARM | Alarm volume. | |||||||||
| String | VOLUME_BLUETOOTH_SCO | Bluetooth Headset volume. | |||||||||
| String | VOLUME_MUSIC | Music/media/gaming volume. | |||||||||
| String | VOLUME_NOTIFICATION | Notification volume. | |||||||||
| String | VOLUME_RING | Ringer volume. | |||||||||
| String | VOLUME_SYSTEM | System/notifications volume. | |||||||||
| String | VOLUME_VOICE | Voice call volume. | |||||||||
| String | WAIT_FOR_DEBUGGER | If 1, when launching DEBUG_APP it will wait for the debugger before starting user code. | |||||||||
| String | WALLPAPER_ACTIVITY | Name of activity to use for wallpaper on the home screen. | |||||||||
| String | WIFI_MAX_DHCP_RETRY_COUNT | This constant is deprecated. UseWIFI_MAX_DHCP_RETRY_COUNT instead |
|||||||||
| String | WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS | This constant is deprecated. UseWIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MSinstead |
|||||||||
| String | WIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON | This constant is deprecated. UseWIFI_NETWORKS_AVAILABLE_NOTIFICATION_ON instead |
|||||||||
| String | WIFI_NETWORKS_AVAILABLE_REPEAT_DELAY | This constant is deprecated. UseWIFI_NETWORKS_AVAILABLE_REPEAT_DELAY instead |
|||||||||
| String | WIFI_NUM_OPEN_NETWORKS_KEPT | This constant is deprecated. UseWIFI_NUM_OPEN_NETWORKS_KEPT instead |
|||||||||
| String | WIFI_ON | This constant is deprecated. Use WIFI_ON instead |
|||||||||
| String | WIFI_SLEEP_POLICY | 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). | |||||||||
| int | WIFI_SLEEP_POLICY_DEFAULT | Value for WIFI_SLEEP_POLICY to use the default Wi-Fi sleep policy, which is to sleep shortly after the turning off according to the STAY_ON_WHILE_PLUGGED_IN setting. |
|||||||||
| int | WIFI_SLEEP_POLICY_NEVER | Value for WIFI_SLEEP_POLICY to never go to sleep. |
|||||||||
| int | WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED | Value for WIFI_SLEEP_POLICY to use the default policy when the device is on battery, and never go to sleep when the device is plugged in. |
|||||||||
| String | WIFI_STATIC_DNS1 | If using static IP, the primary DNS's IP address. | |||||||||
| String | WIFI_STATIC_DNS2 | If using static IP, the secondary DNS's IP address. | |||||||||
| String | WIFI_STATIC_GATEWAY | If using static IP, the gateway's IP address. | |||||||||
| String | WIFI_STATIC_IP | The static IP address. | |||||||||
| String | WIFI_STATIC_NETMASK | If using static IP, the net mask. | |||||||||
| String | WIFI_USE_STATIC_IP | Whether to use static IP and other static network attributes. | |||||||||
| String | WIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGE | This constant is deprecated. UseWIFI_WATCHDOG_ACCEPTABLE_PACKET_LOSS_PERCENTAGEinstead |
|||||||||
| String | WIFI_WATCHDOG_AP_COUNT | This constant is deprecated. UseWIFI_WATCHDOG_AP_COUNT instead |
|||||||||
| String | WIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS | This constant is deprecated. UseWIFI_WATCHDOG_BACKGROUND_CHECK_DELAY_MS instead |
|||||||||
| String | WIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED | This constant is deprecated. UseWIFI_WATCHDOG_BACKGROUND_CHECK_ENABLED instead |
|||||||||
| String | WIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MS | This constant is deprecated. UseWIFI_WATCHDOG_BACKGROUND_CHECK_TIMEOUT_MSinstead |
|||||||||
| String | WIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT | This constant is deprecated. UseWIFI_WATCHDOG_INITIAL_IGNORED_PING_COUNT instead |
|||||||||
| String | WIFI_WATCHDOG_MAX_AP_CHECKS | This constant is deprecated. UseWIFI_WATCHDOG_MAX_AP_CHECKS instead |
|||||||||
| String | WIFI_WATCHDOG_ON | This constant is deprecated. Use WIFI_WATCHDOG_ONinstead |
|||||||||
| String | WIFI_WATCHDOG_PING_COUNT | This constant is deprecated. UseWIFI_WATCHDOG_PING_COUNT instead |
|||||||||
| String | WIFI_WATCHDOG_PING_DELAY_MS | This constant is deprecated. UseWIFI_WATCHDOG_PING_DELAY_MS instead |
|||||||||
| String | WIFI_WATCHDOG_PING_TIMEOUT_MS | This constant is deprecated. UseWIFI_WATCHDOG_PING_TIMEOUT_MS instead |
|||||||||
| String | WINDOW_ANIMATION_SCALE | Scaling factor for normal window animations. | |||||||||
通过如下的函数可以对其进行读写：
| static void | getConfiguration(ContentResolver cr, Configuration outConfig)
Convenience function to read all of the current configuration-related settings into a
Configuration object.
|
| static float | getFloat(ContentResolver cr, String name, float def)
Convenience function for retrieving a single system settings value as a floating point number.
|
| static float | getFloat(ContentResolver cr, String name)
Convenience function for retrieving a single system settings value as a float.
|
| static int | getInt(ContentResolver cr, String name)
Convenience function for retrieving a single system settings value as an integer.
|
| static int | getInt(ContentResolver cr, String name, int def)
Convenience function for retrieving a single system settings value as an integer.
|
| static long | getLong(ContentResolver cr, String name, long def)
Convenience function for retrieving a single system settings value as a
long.
|
| static long | getLong(ContentResolver cr, String name)
Convenience function for retrieving a single system settings value as a
long.
|
| static boolean | getShowGTalkServiceStatus(ContentResolver cr) |
| synchronized static String | getString(ContentResolver resolver, String name)
Look up a name in the database.
|
| static Uri | getUriFor(String name)
Construct the content URI for a particular name/value pair, useful for monitoring changes with a ContentObserver.
|
| static boolean | putConfiguration(ContentResolver cr, Configuration config)
Convenience function to write a batch of configuration-related settings from a
Configuration object.
|
| static boolean | putFloat(ContentResolver cr, String name, float value)
Convenience function for updating a single settings value as a floating point number.
|
| static boolean | putInt(ContentResolver cr, String name, int value)
Convenience function for updating a single settings value as an integer.
|
| static boolean | putLong(ContentResolver cr, String name, long value)
Convenience function for updating a single settings value as a long integer.
|
| static boolean | putString(ContentResolver resolver, String name, String value)
Store a name/value pair into the database.
|
| static void | setShowGTalkServiceStatus(ContentResolver cr, boolean flag) |
注意，应用程序中应加入：