Android SQCipher是否需要关闭数据库？
我已经阅读了很多关于在android中使用标准SQLiteDatabase的知识，似乎最好的方法是保留SQLiteOpenHelper的一个实例，并且永远不要关闭返回的SQLiteDatabase对象，也不要关闭SQLiteOpenHelper。 问题是在使用SQCipher加密库时这些准则是否有效？ 看起来SQCipher包中的SQLiteOpenHelper的close（）方法不是空的，而是发布一些东西。 永远不要调用这种方法是否安全？
以下是Github的SQLiteDatabase.close（）方法的实际代码（http://goo.gl/u4L0C）：
public void close() {
if (!isOpen()) {
return; // already closed
}
lock();
try {
closeClosable();
// close this database instance - regardless of its reference count value
onAllReferencesReleased();
} finally {
unlock();
}
}
private void closeClosable() {
/* deallocate all compiled sql statement objects from mCompiledQueries cache.
* this should be done before de-referencing all {@link SQLiteClosable} objects
* from this database object because calling
* {@link SQLiteClosable#onAllReferencesReleasedFromContainer()} could cause the database
* to be closed. sqlite doesn't let a database close if there are
* any unfinalized statements - such as the compiled-sql objects in mCompiledQueries.
*/
deallocCachedSqlStatements();
Iterator<Map.Entry<SQLiteClosable, Object>> iter = mPrograms.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry<SQLiteClosable, Object> entry = iter.next();
SQLiteClosable program = entry.getKey();
if (program != null) {
program.onAllReferencesReleasedFromContainer();
}
}
}