尽管使用了内容提供者和顺序数据库访问，android sqlite的“数据库被锁定”错误仍然存在

I have an app (Android 2.2 Google API Level 8) that has multiple activities pulling data from a content provider (SELECT only database access). It also has a service with a central blocking task queue accepting any database write tasks; activities can fire a service request (As intent) which places a task on a blocking queue for sequential retrieval by a single thread and execution. Database is around 4mb.I have an app (Android 2.2 Google API Level 8)