Android e-books packaged into APk have the following advantages: simple installation, users can download them from the Internet or mobile phones and install them directly. The Android system will automatically help users do their work well and avoid tedious things such as copying files. Android e-books in APk format generally integrate page turning effect, navigation and so on. , can be read without external tools; Each book in APK format is an icon in Android phone, which is convenient for users to click and uninstall Android e-books. As the name implies, an Android e-book is an e-book read on the Android system. At present, the commonly supported formats of Android e-books are: OEB file format OEB(Bernstein file format) is the abbreviation of Open eBook, which is the industry standard for e-book formatting and packaging. Based on XML (a subset of standard generalized markup language), OEB defines how to mark the text of electronic publications and how to mark all parts of e-books (cover, table of contents, text, description, index, etc.). ) wrap it together. OEB is actually a synthesis, which can be said to be a subset of HTML 4.0, XML 1.0, Dublin Core, CSS 1.0, mainly to make editors and system vendors spend the least effort to join the ranks of e-books, because they are familiar with the above languages. The version of OEB 1.0 still emphasizes the format, and the upcoming OEB 2.0 will completely focus on XML and strictly separate the format from the data content.

2.LIT file format This format is a proprietary file format of Microsoft Reader, a software developed by Microsoft Corporation of the United States. This document format is a variant of HTML. At the same time, OEB document format is also supported. .

The biggest advantage of this format is that the reading method is very close to the paper books we usually read, so it is very friendly to read and supports full-screen reading. However, it is characterized by no scroll bar, and all pages are turned by clicking the page number, so it is more like reading a real paper book. Because this format does not support Chinese, at present, only this file format is tried to produce and publish e-books in China. Reader: Microsoft Reader. Pocket PC and smart phone support WinCE system.

3. number three. XEB file format is a handheld e-book format. Chinese e-book format based on OEB(Opene Book) takes xm (a subset of standard generalized markup language) technology as the core.

It is suitable for mobile phones, special hand-held e-book readers, learning machines, MP3, MP4 and other terminal devices, and has many advantages such as small code files and less resource occupation. Integrate format and streaming reading technology to automatically adapt to the terminal screen size; Support multilingual reading; Support tables, mathematical formulas, lists, etc. Support uncommon words, ancient books and other character sets; Support reading and downloading schemes of multiple protocols; Support communication interaction function; Support DOC, PDF, APABI and other types of conversion and reading. Readers: Apabi XEB Reader, Zinko Hanlin Book, Founder Science and Technology Grand Hyatt World Reader, Hong Kong GSL, etc.

4.ebx file format Electronic Book Exchange. A standard developed by the E-book Exchange Working Group for the secure transmission of e-book content between content creators, publishers and end users. Reading software: XReader, PDA and smart phone supporting WinCE system.

5.RB file format "Rb" is the abbreviation of "Rocket eBook", which is an e-book reader similar to a PDA. Rockebook developed by NuvoMedia Company adopts a special document structure, which can integrate text, image and sound. The documents of rocket e-books are composed of two types: basic documents (*. Rb) and annotation documents (*. rh，*。 Rn and *. ra)。

6.PDB format The file format adopted by PalmOS reading tools. Pdb is the abbreviation of Palm DataBase, and the file extension used by Palm OS is. pdb。 You can open it with your palm.

7.jar format JAR(Java ARchive) is a platform-independent file format, which can combine multiple files into one file. Users can bind multiple Java applet and their required components. Class files, images and sounds) are converted into JAR files, and then downloaded to the browser as a simple HTTP (Hypertext Transfer Protocol) transaction, which greatly improves the download speed. JAR format also supports compression, thus reducing the file size and further shortening the download time. In addition, applet writers can also sign each item in the JAR file by digital signature to confirm its source. It is written in Java, fully backward compatible with the existing applet code, and can be fully extended.

However, the above formats generally need to be downloaded from the Internet with special reading tools or manually downloaded and copied to the fixed directory of special tools, which is very inconvenient for novices of Android phones. Therefore, a user-friendly APK Android e-book is formed by combining the APK format of Android installer with the concept of e-book.