The connection pool for database '/data/data/....db' has been unable to grant a connection to thread

The connection pool for database '/data/data/....db' has been unable to grant a connection to thread 1 (main) with flags 0x5 for 30.002 seconds.

原来是因为在beginTransaction(); ..１....execSQL(sql); ...２...endTransaction(); 在2处又执行了查询数据库操作引起的。解决方法：.在endTransaction();后再执行查询操作。