实践教程：Android应用的数据库驱动设计

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"Android Database Programming" 是一本由 Jason Wei 所著的专业教程，专为那些想要在 Android 应用程序开发中充分利用数据力量的开发者设计。这本书深入探讨了如何在移动平台上构建和管理嵌入式数据库，使应用程序能够实现数据驱动的功能。它不仅涵盖了理论知识，还提供了实用的实践指导，帮助读者理解和掌握Android数据库编程的最佳实践。在这本教程中，作者带领读者从基础概念入手，包括SQLite（Android的默认数据库引擎）的介绍，SQL语言的使用，以及如何创建、查询、更新和删除数据库表。随着章节的深入，读者将学习如何处理复杂的数据操作，如事务管理、索引优化以及与网络服务的交互，这些都是构建高效、稳定Android应用的关键。此外，书中的内容还可能涉及NoSQL数据库的选择与集成，以及如何利用Android Room（一个高级ORM库）来简化数据库操作。同时，为了适应不断变化的技术环境，书中还会讨论最新的数据库设计模式和性能优化策略，确保读者能够跟上行业的发展步伐。尽管本书力求准确无误，但读者需要注意的是，由于软件技术的快速发展，部分信息可能存在时效性限制。版权方面，未经Packt Publishing的书面许可，不得复制、存储或以任何形式传播书中的内容，除非用于学术引用。作者和出版商不对因本书导致的直接或间接损失承担责任。 "Android Database Programming"是一本既适合初学者入门，也适合有一定经验的开发者提升技能的实用指南，通过它，读者可以构建出功能强大且数据驱动的Android应用，满足现代移动应用的需求。

Preface

[ 5 ]

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Chapter 1

[ 9 ]

Here the rst argument simply species which shared preference mapping you

want (each application can own several separate shared preference mappings, and

so, just like you would specify the table name in a database, you must specify which

mapping you want to retrieve). The second argument is a little more complex — in

the example above, we pass in MODE_PRIVATE as the argument and this argument

simply species the visibility of the shared preference instance you are retrieving

(in this case the visibility is set to private, so that only your application can access

the mappings contents). Other modes include:

•

MODE_WORLD_READABLE: Makes the visibility of your map accessible by other

applications, though contents can only be read

•

MODE_WORD_WRITEABLE: Makes the visibility of your map accessible by other

applications for both reading and writing

•

MODE_MULTI_PROCESS: This mode, available since API Level 11, allows you

to modify your map by multiple processes which may be writing to the same

shared preference instance

Now, once we have our shared preference object, we can immediately start

retrieving contents by its various

get() methods — for instance, the getString()

and getBoolean() methods we saw earlier. These get() methods will typically take

two parameters: the rst being the key, and the second being the default value if the

given key is not found. Taking the previous example, we have:

String stringValue = sp.getString("strKey", "error");

boolean booleanValue = sp.getBoolean("boolKey", false);

And so, in the rst case, we're trying to retrieve the string value associated with the

key strKey, and defaulting to the string error if no such key is found. Likewise,

in the second case, we're trying to retrieve a boolean value associated with the key

boolKey, and defaulting to the boolean false if no such key is found.

However, if you want to edit contents or add new content, then you'll have to retrieve

the

Editor object that each shared preference instance contains. This Editor object

contains all of the put() methods which allow you to pass a key along with its

associated value (just like you would for a standard Map object) — the only caveat is

that after you add or update the content of your shared preference, you need to call

the Editor object's commit() method to save down those changes. Furthermore, again,

just like a standard Map object, the Editor class also contains remove() and clear()

methods for you to freely manipulate the contents of your shared preference.

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