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。

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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。

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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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Other products such as the i-FlashDrive from PhotoFast create USB memory access for external storage devices.

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