This article covered the Android storage APIs, from preferences to using SQLite and internal and external memory.
本文介绍了几个Android存储api，从首选项到使用SQLite和内部及外部内存。
External memory, also known as secondary storage, is extension of the internal memory.
外部存储器，也称辅存，是内存的延伸。
Therefore, the function of the external memory is to expand the capacity of the storage system.
因而，外存的作用是扩大存储系统的容量。
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