Resolving SQLite Exceptions: library routine called out of sequence

In the project development, using SQLite accidentally will encounter a variety of db anomalies, online search without this information, write down to record.

Exception information:
Android.database.sqlite.SQLiteMisuseException:library routine called out of sequence:, while compiling: ...

There are 2 ways to solve this anomaly:
Method one: When using DB in a singleton mode, the function [method] can be solved by adding synchronous synchronized.

Method Two: The Factory mode using DB can also be resolved (or new DB in the thread, and then call the relevant function [method]).