SettingsProvider defaults.xml 修改默认值数据及更新数据飘飘如叶-

SettingsProvider数据存储

frameworksbasepackagesSettingsProvider中android6.0之后用不在用settings.db这个数据了,会存储在/data/system/users/0这个目录三个xml文件下:

1. settings_global.xml：所有的偏好设置对系统的所有用户公开，第三方有读没有写的权限
2. settings_system.xml：包含各种各样的用户偏好系统设置
3. settings_secure.xml：安全性的用户偏好系统设置，第三方APP有读没有写的权限
   在SettingsProvidersrccomandroidproviderssettingsSettingsProvider.java中创建

 final class SettingsRegistry { private static final String DROPBOX_TAG_USERLOG = "restricted_profile_ssaid"; private static final String SETTINGS_FILE_GLOBAL = "settings_global.xml"; private static final String SETTINGS_FILE_SYSTEM = "settings_system.xml"; private static final String SETTINGS_FILE_SECURE = "settings_secure.xml"; private final SparseArray<SettingsState> mSettingsStates = new SparseArray<>(); private GenerationRegistry mGenerationRegistry; 

private File getSettingsFile(int key) { if (isGlobalSettingsKey(key)) { final int userId = getUserIdFromKey(key); return new File(Environment.getUserSystemDirectory(userId),                        SETTINGS_FILE_GLOBAL); } else if (isSystemSettingsKey(key)) { final int userId = getUserIdFromKey(key); return new File(Environment.getUserSystemDirectory(userId),                        SETTINGS_FILE_SYSTEM); } else if (isSecureSettingsKey(key)) { final int userId = getUserIdFromKey(key); return new File(Environment.getUserSystemDirectory(userId),                        SETTINGS_FILE_SECURE); } else { throw new IllegalArgumentException("Invalid settings key:" + key); } }                                                                                                                                                    ```  ## 调试的时候获取或者设置相关的默认值 通过三种类型system, secure, global 可以分别获取和这种值 设置: - adb shell settings put system [key] [value] - adb shell settings put global [key] [value] - adb shell settings put secure default_input_method com.sohu.inputmethod.sogouoem/.SogouIME   获取: - adb shell settings get secure default_input_method  - adb shell settings get global device_provisioned  - adb shell settings get system [key]   也可以进入/data/system/users/0输入如下命令获取  - cat settings_global.xml | grep device_provisioned ## 修改系统默认的一些设置配置值 当我们要修改一些默认值时一般修改SettingsProvider/res/values/defaults.xml可以修改通用属性 ```java <resources> <bool name="def_dim_screen">true</bool>自动关屏        开     <integer name="def_screen_off_timeout">30000</integer> Android睡眠时间为1分钟     //假设默认打开wifi可以将下面自动设置为true <bool name="def_wifi_on">false</bool> //wifi 关 ... 

在SettingsProvidersrccomandroidproviderssettingsDatabaseHelper.java中

private void loadGlobalSettings(SQLiteDatabase db) {         SQLiteStatement stmt = null; try {             stmt = db.compileStatement("INSERT OR IGNORE INTO global(name,value)" + " VALUES(?,?);"); // --- Previously in 'system' loadBooleanSetting(stmt, Settings.Global.AIRPLANE_MODE_ON,                     R.bool.def_airplane_mode_on); loadBooleanSetting(stmt, Settings.Global.THEATER_MODE_ON,                     R.bool.def_theater_mode_on); //获取wifi默认值并设置 loadBooleanSetting(stmt, Settings.Global.WIFI_ON,                     R.bool.def_wifi_on); 

强制更新数据

由于公司是定制产品需要ota强制默认打开wifi开关

• 设置default.xml字段:”def_wifi_on”为true
• 更改SettingsProvidersrccomandroidproviderssettingsSettingsProvider.java中的字段SETTINGS_VERSION 加1

private final class UpgradeController { //ota升级强制更改默认值需要该字段自增一如 private static final int SETTINGS_VERSION = 132; private final int mUserId; 

• 最后一定要更新currentVersion如果有字段可以添加相应的字段

if (currentVersion == 131) { // Initialize new multi-press timeout to default value // final SettingsState systemSecureSettings = getSecureSettingsLocked(userId); //    final String oldValue = systemSecureSettings.getSettingLocked( //        Settings.Secure.MULTI_PRESS_TIMEOUT).getValue(); //    if (TextUtils.equals(null, oldValue)) { //     systemSecureSettings.insertSettingLocked( //         Settings.Secure.MULTI_PRESS_TIMEOUT, //            String.valueOf(getContext().getResources().getInteger( //             R.integer.def_multi_press_timeout_millis)), //           SettingsState.SYSTEM_PACKAGE_NAME); }  currentVersion = 132; } 

不执行的会获取SettingsProvidersrccomandroidproviderssettingsDatabaseHelper.java中的版本号DATABASE_VERSION导致相应的bug

参考文献:
https://www.jianshu.com/p/3922f68b3560
https://www.jianshu.com/p/7815d573b12f