关于Settings.Global /Secure/System

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关于Settings.Global /Secure/System 目前来看区别不大

Settings.db是系统的一个Provider，可以获取或者修改里面的数据值，这几个表都可以存储String,Int等类型的值，数据类型不受限制

系统可能会根据不同的数据进行分类

如果添加自己的数据，写在哪个表里都行，数据的获取和修改是需要的权限以及字段名的长度的限制

直接看代码

 /**1128     * @hide - Private call() method on SettingsProvider to read from 'system' table.1129     */1130    public static final String CALL_METHOD_GET_SYSTEM = "GET_system";11311132    /**1133     * @hide - Private call() method on SettingsProvider to read from 'secure' table.1134     */1135    public static final String CALL_METHOD_GET_SECURE = "GET_secure";11361137    /**1138     * @hide - Private call() method on SettingsProvider to read from 'global' table.1139     */1140    public static final String CALL_METHOD_GET_GLOBAL = "GET_global";11411142    /**1143     * @hide - User handle argument extra to the fast-path call()-based requests1144     */1145    public static final String CALL_METHOD_USER_KEY = "_user";11461147    /** @hide - Private call() method to write to 'system' table */1148    public static final String CALL_METHOD_PUT_SYSTEM = "PUT_system";11491150    /** @hide - Private call() method to write to 'secure' table */1151    public static final String CALL_METHOD_PUT_SECURE = "PUT_secure";11521153    /** @hide - Private call() method to write to 'global' table */1154    public static final String CALL_METHOD_PUT_GLOBAL= "PUT_global";

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