在api 11之前使用AbstractThreadSyncAdapter

正如文档中所说:

Api 5级:

public AbstractThreadedSyncAdapter (Context context, boolean autoInitialize)

Api 11级:

public AbstractThreadedSyncAdapter (Context context, boolean autoInitialize, boolean allowParallelSyncs)

因此,您只需要实现两个构造函数,然后调用其中一个或另一个:

if (sSyncAdapter == null) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                    sSyncAdapter = new NotificationsSyncAdapter(getApplicationContext(), true, true);
                } else {
                    sSyncAdapter = new NotificationsSyncAdapter(getApplicationContext(), true);
                }
            }