import org.chromium.sync.notifier.InvalidationPreferences; //导入依赖的package包/类
/**
 * Reads all stored preferences and calls
 * {@link #setRegisteredTypes(android.accounts.Account, boolean, java.util.Set)} with the stored
 * values, refreshing the set of types with {@code types}. It can be used on startup of Chrome
 * to ensure we always have a set of registrations consistent with the native code.
 * @param types    Set of types for which to register.
 */
public void refreshRegisteredTypes(Set<ModelType> types) {
    InvalidationPreferences invalidationPreferences = new InvalidationPreferences(mContext);
    Set<String> savedSyncedTypes = invalidationPreferences.getSavedSyncedTypes();
    Account account = invalidationPreferences.getSavedSyncedAccount();
    boolean allTypes = savedSyncedTypes != null &&
            savedSyncedTypes.contains(ModelType.ALL_TYPES_TYPE);
    setRegisteredTypes(account, allTypes, types);
}
 

import org.chromium.sync.notifier.InvalidationPreferences; //导入依赖的package包/类
/**
 * Sets object ids for which the client should register for notification. This is intended for
 * registering non-Sync types; Sync types are registered with {@code setRegisteredTypes}.
 *
 * @param objectSources The sources of the objects.
 * @param objectNames   The names of the objects.
 */
@CalledByNative
public void setRegisteredObjectIds(int[] objectSources, String[] objectNames) {
    InvalidationPreferences invalidationPreferences = new InvalidationPreferences(mContext);
    Account account = invalidationPreferences.getSavedSyncedAccount();
    Intent registerIntent =
            InvalidationIntentProtocol.createRegisterIntent(
                    account, objectSources, objectNames);
    registerIntent.setClass(mContext, InvalidationService.class);
    mContext.startService(registerIntent);
}