转载自http://blog.csdn.net/hfreeman2008/article/details/21603577

在设置(settings)应用中，我们可以把一些值(int,boolean,string)保存在db数据库。这个值，我们可以在不同的app应用中使用。我们可以非常方便的在此上添加一些简单的代码，实现一个新的变量在db数据库中，方便不同的app来共同使用。

<a name="t0" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>1.关键类和文件

frameworks\base\packages\settingsprovider\src\com\android\providers\settings*databaseHelper.java*-------给变量赋值，我们可以把变量的初始值写到下面的defaults.xml文件中，使用后面的修改和统一管理。

frameworks\base\packages\settingsprovider\res\values*defaults.xml*----------放置变量的初始值
有四种类型(bool, integer, string, fraction)四种类型
<bool name="def_sound_effects_enabled">true</bool>
<integer name="def_max_dhcp_retries">9</integer>
<string name="def_location_providers_allowed" translatable="false">gps</string>
<fraction name="def_window_animation_scale">100%</fraction>

frameworks\base\core\java\android\provider*settings.java*----------定义变量

<a name="t1" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>2.我们以SET_INSTALL_LOCATION为例，让我们知道这个变量是如何定义使用的：

(1) frameworks\base\core\java\android\provider\settings.java---定义变量：

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1. /**

2. • Let user pick default install location.
4. • @hide

5. */

6. public static final String SET_INSTALL_LOCATION = "set_install_location";

7. MOVED_TO_GLOBAL.add(Settings.Global.SET_INSTALL_LOCATION);

(2) frameworks\base\packages\settingsprovider\src\com\android\providers\settings\ databaseHelper.java------给变量赋值
在loadGlobalSettings(SQLiteDatabase db)方法中：

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1. loadSetting(stmt, Settings.Global.SET_INSTALL_LOCATION, 0);

(3)如何使用：

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1. import android.provider.Settings;

2. boolean userSetInstLocation = (Settings.Global.getInt(getContentResolver(),

3. Settings.Global.SET_INSTALL_LOCATION, 0) != 0);

<a name="t2" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>3.我们再以CAR_DOCK_SOUND为例，让我们看看这个变量是如何定义使用的：

(1) frameworks\base\core\java\android\provider\settings.java---定义变量：

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1. public static final String CAR_DOCK_SOUND = "car_dock_sound";
2. MOVED_TO_GLOBAL.add(Settings.Global.CAR_DOCK_SOUND);

(2) frameworks\base\packages\settingsprovider\src\com\android\providers\settings\ databaseHelper.java------给变量赋值

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1. loadStringSetting(stmt, Settings.Global.CAR_DOCK_SOUND,R.string.def_car_dock_sound);

(3) frameworks\base\packages\settingsprovider\res\values\defaults.xml-----定义初始值

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1. <string name="def_car_dock_sound" translatable="false">/system/media/audio/ui/Dock.ogg</string>

(4)如何使用：

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1. import android.provider.Settings;

2. String whichSound = null;

3. whichSound = Settings.Global.CAR_DOCK_SOUND;

4. ContentResolver cr = mContext.getContentResolver();

5. final String soundPath = Settings.Global.getString(cr, whichSound);

<a name="t3" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>4.在DB数据库中添加一个标志位(HY_VIP_FUNCTION)的样例：

(1)在任意APP中使用样例：

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1. int vipFunction = Settings.System.getInt(getContentResolver(), Settings.System.HY_VIP_FUNCTION, -1);

(2)修改的文件：

frameworks\base\packages\settingsprovider\src\com\android\providers\settings\DatabaseHelper.java

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1. private void loadSystemSettings(SQLiteDatabase db) {

2. SQLiteStatement stmt = null;

3. try {

4. stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)"

5. • " VALUES(?,?);");

6. loadBooleanSetting(stmt, Settings.System.DIM_SCREEN,

7. R.bool.def_dim_screen);

8. loadIntegerSetting(stmt, Settings.System.SCREEN_OFF_TIMEOUT,

9. R.integer.def_screen_off_timeout);

10. // Set default cdma DTMF type

11. loadSetting(stmt, Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, 0);

12. // Set default hearing aid

13. loadSetting(stmt, Settings.System.HEARING_AID, 0);

14. // Set default tty mode

15. loadSetting(stmt, Settings.System.TTY_MODE, 0);

16. loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS,

17. R.integer.def_screen_brightness);

18. loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE,

19. R.bool.def_screen_brightness_automatic_mode);

20. loadDefaultAnimationSettings(stmt);

21. loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,

22. R.bool.def_accelerometer_rotation);

23. loadDefaultHapticSettings(stmt);

24. loadBooleanSetting(stmt, Settings.System.NOTIFICATION_LIGHT_PULSE,

25. R.bool.def_notification_pulse);

26. loadUISoundEffectsSettings(stmt);

27. loadIntegerSetting(stmt, Settings.System.POINTER_SPEED,

28. R.integer.def_pointer_speed);

29. /** Add by HY [wangxianming] add VIP Function in 2014-02-21 by start @{ */

30. loadBooleanSetting(stmt, Settings.System.HY_VIP_FUNCTION,

31. R.bool.hy_def_vip_function_value);

32. /** Add by HY [wangxianming] add VIP Function in 2014-02-21 by end @} */

frameworks\base\core\java\android\provider\Settings.java

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1. /**

2. • Name of activity to use for wallpaper on the home screen.
4. • @deprecated Use {@link WallpaperManager} instead.

5. */

6. @Deprecated

7. public static final String WALLPAPER_ACTIVITY = "wallpaper_activity";

8. /**

9. • @deprecated Use {@link android.provider.Settings.Global#AUTO_TIME}
10. • instead

11. */

12. @Deprecated

13. public static final String AUTO_TIME = Global.AUTO_TIME;

14. /**

15. • @deprecated Use {@link android.provider.Settings.Global#AUTO_TIME_ZONE}
16. • instead

17. */

18. @Deprecated

19. public static final String AUTO_TIME_ZONE = Global.AUTO_TIME_ZONE;

20. /**

21. • Display times as 12 or 24 hours
22. • 12
23. • 24

24. */

25. public static final String TIME_12_24 = "time_12_24";

26. /**

27. • Add by HY [wangxianming] add VIP Function in 2014-02-21 by start @{
29. • Values 1: is open this function 0: is close this function
31. • @hide

32. */

33. public static final String HY_VIP_FUNCTION = "hy_vip_function";

34. /** Add by HY [wangxianming] add VIP Function in 2014-02-21 by end @} */

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1. /**

2. • Settings to backup. This is here so that it's in the same place as the settings
3. • keys and easy to update.
5. • NOTE: Settings are backed up and restored in the order they appear

6. •   in this array. If you have one setting depending on another, 
     

7. •   make sure that they are ordered appropriately. 
     

9. • @hide

10. */

11. public static final String[] SETTINGS_TO_BACKUP = {

12. STAY_ON_WHILE_PLUGGED_IN, // moved to global

13. WIFI_USE_STATIC_IP,

14. WIFI_STATIC_IP,

15. WIFI_STATIC_GATEWAY,

16. WIFI_STATIC_NETMASK,

17. WIFI_STATIC_DNS1,

18. WIFI_STATIC_DNS2,

19. BLUETOOTH_DISCOVERABILITY,

20. BLUETOOTH_DISCOVERABILITY_TIMEOUT,

21. DIM_SCREEN,

22. SCREEN_OFF_TIMEOUT,

23. SCREEN_BRIGHTNESS,

24. SCREEN_BRIGHTNESS_MODE,

25. SCREEN_AUTO_BRIGHTNESS_ADJ,

26. VIBRATE_INPUT_DEVICES,

27. MODE_RINGER, // moved to global

28. MODE_RINGER_STREAMS_AFFECTED,

29. MUTE_STREAMS_AFFECTED,

30. VOLUME_VOICE,

31. VOLUME_SYSTEM,

32. VOLUME_RING,

33. VOLUME_MUSIC,

34. VOLUME_ALARM,

35. VOLUME_NOTIFICATION,

36. VOLUME_BLUETOOTH_SCO,

37. VOLUME_VOICE + APPEND_FOR_LAST_AUDIBLE,

38. VOLUME_SYSTEM + APPEND_FOR_LAST_AUDIBLE,

39. VOLUME_RING + APPEND_FOR_LAST_AUDIBLE,

40. VOLUME_MUSIC + APPEND_FOR_LAST_AUDIBLE,

41. VOLUME_ALARM + APPEND_FOR_LAST_AUDIBLE,

42. VOLUME_NOTIFICATION + APPEND_FOR_LAST_AUDIBLE,

43. VOLUME_BLUETOOTH_SCO + APPEND_FOR_LAST_AUDIBLE,

44. TEXT_AUTO_REPLACE,

45. TEXT_AUTO_CAPS,

46. TEXT_AUTO_PUNCTUATE,

47. TEXT_SHOW_PASSWORD,

48. AUTO_TIME, // moved to global

49. AUTO_TIME_ZONE, // moved to global

50. TIME_12_24,

51. /** Add by HY [wangxianming] add VIP Function in 2014-02-21 by start @{ */

52. HY_VIP_FUNCTION,

53. /** Add by HY [wangxianming] add VIP Function in 2014-02-21 by end @} */

54. DATE_FORMAT,

55. HY_WALLPAPER_MODE,

56. DTMF_TONE_WHEN_DIALING,

57. DTMF_TONE_TYPE_WHEN_DIALING,

58. HEARING_AID,

59. TTY_MODE,

60. SOUND_EFFECTS_ENABLED,

61. HAPTIC_FEEDBACK_ENABLED,

62. POWER_SOUNDS_ENABLED, // moved to global

63. DOCK_SOUNDS_ENABLED, // moved to global

64. LOCKSCREEN_SOUNDS_ENABLED,

65. SHOW_WEB_SUGGESTIONS,

66. NOTIFICATION_LIGHT_PULSE,

67. SIP_CALL_OPTIONS,

68. SIP_RECEIVE_CALLS,

69. POINTER_SPEED,

70. VIBRATE_WHEN_RINGING

71. };

frameworks\base\packages\settingsprovider\res\values\Defaults.xml------http://------------设置初始值

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2. <bool name="def_stay_on_while_plugged_in">false</bool>

4. <integer name="def_max_dhcp_retries">9</integer>

6. <bool name="def_user_setup_complete">true</bool>

7. <integer name="hy_def_wallpaper_mode_value">-1</integer>

9. <bool name="hy_def_vip_function_value">false</bool>