SettingsProvider之System内部类

最新推荐文章于 2025-09-12 19:47:52 发布

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#SettingsProvider #Settings.System

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本文介绍Android系统中设置项从Settings.System迁移到Settings.Secure和Settings.Global的过程，并提供了字段转移、字符串获取与设置等方法的具体实现。

转载请注明出处：http://blog.youkuaiyun.com/droyon/article/details/35558995

1、字段转移

MOVED_TO_SECURE = new HashSet<String>(30);
MOVED_TO_SECURE.add(Secure.ANDROID_ID);
MOVED_TO_SECURE.add(Secure.HTTP_PROXY);

MOVED_TO_GLOBAL = new HashSet<String>();
            MOVED_TO_SECURE_THEN_GLOBAL = new HashSet<String>();

            // these were originally in system but migrated to secure in the past,
            // so are duplicated in the Secure.* namespace
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.ADB_ENABLED);
            MOVED_TO_SECURE_THEN_GLOBAL.add(Global.BLUETOOTH_ON);

MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_ON);
MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_RADIOS);
MOVED_TO_GLOBAL.add(Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);

/** @hide */
        public static void getMovedKeys(HashSet<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_GLOBAL);
            outKeySet.addAll(MOVED_TO_SECURE_THEN_GLOBAL);
        }

        /** @hide */
        public static void getNonLegacyMovedKeys(HashSet<String> outKeySet) {
            outKeySet.addAll(MOVED_TO_GLOBAL);
        }

2、构建sNameValueCache。

private static final NameValueCache sNameValueCache = new NameValueCache(
                SYS_PROP_SETTING_VERSION,
                CONTENT_URI,
                CALL_METHOD_GET_SYSTEM,
                CALL_METHOD_PUT_SYSTEM);

3、获取String

/** @hide */
        public static String getStringForUser(ContentResolver resolver, String name,
                int userHandle) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Secure, returning read-only value.");
                return Secure.getStringForUser(resolver, name, userHandle);
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, returning read-only value.");
                return Global.getStringForUser(resolver, name, userHandle);
            }
            return sNameValueCache.getStringForUser(resolver, name, userHandle);
        }

4、putString

/** @hide */
        public static boolean putStringForUser(ContentResolver resolver, String name, String value,
                int userHandle) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Secure, value is unchanged.");
                return false;
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, value is unchanged.");
                return false;
            }
            return sNameValueCache.putStringForUser(resolver, name, value, userHandle);
        }

5、getUriFor

public static Uri getUriFor(String name) {
            if (MOVED_TO_SECURE.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                    + " to android.provider.Settings.Secure, returning Secure URI.");
                return Secure.getUriFor(Secure.CONTENT_URI, name);
            }
            if (MOVED_TO_GLOBAL.contains(name) || MOVED_TO_SECURE_THEN_GLOBAL.contains(name)) {
                Log.w(TAG, "Setting " + name + " has moved from android.provider.Settings.System"
                        + " to android.provider.Settings.Global, returning read-only global URI.");
                return Global.getUriFor(Global.CONTENT_URI, name);
            }
            return getUriFor(CONTENT_URI, name);
        }