精通Android数据库开发：打造高效数据应用

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"Android数据库开发是现代移动应用开发的重要组成部分，特别是在数据驱动的世界中，无论是电商、搜索引擎还是社交媒体，都在依赖大量的数据进行个性化推荐和服务优化。本书《Android Database Programming》由Jason Wei撰写，旨在帮助读者深入理解如何在Android操作系统中利用各种数据存储方法，构建高效、设计良好且可扩展的数据中心应用。书中探讨了Android数据库开发的关键概念和技术，包括但不限于： 1. **SQLite数据库**：Android系统内置的轻量级关系型数据库，适用于存储大量结构化数据。SQLite支持SQL查询，可以创建、更新、删除和查询表，是许多Android应用的首选数据库解决方案。 2. **ContentProvider**：Android中的一个组件，用于在不同应用程序之间共享数据。通过ContentProvider，开发者可以将自己的数据库暴露给其他应用，实现数据的跨应用访问。 3. **SharedPreferences**：用于存储轻量级、简单的键值对数据，适合保存用户设置和偏好。 4. **File存储**：当需要存储二进制数据或大文件时，如图片和音频，文件存储是较好的选择。Android提供了多种文件操作API，如File类和ParcelFileDescriptor。 5. **内部存储与外部存储**：内部存储是私有的，应用可以安全地存储数据，但空间有限；外部存储（如SD卡）对所有应用开放，更适合存储用户可访问的内容。 6. **.orm框架**：为了简化数据库操作，一些第三方库如Room（Google官方推荐）、GreenDao和ORMLite提供了对象关系映射功能，将数据模型与数据库表直接关联，减少手动SQL编写的工作量。 7. **异步数据处理**：考虑到UI线程不应被阻塞，书中可能涵盖了AsyncTask、Loader、LiveData和Repository模式等，以实现数据的后台加载和更新。 8. **数据同步和备份**：讨论如何使用SyncAdapter和BackupAgent处理数据在网络与本地间的同步以及用户数据的备份恢复。 9. **性能优化**：如何有效地查询和操作数据库以提高应用性能，如使用索引、批量插入和事务管理。 10. **安全性和隐私**：在处理用户数据时，开发者需要关注数据的安全性，避免数据泄露，确保用户隐私。通过这本书，作者希望读者能够掌握各种数据存储方法的适用场景，了解其优缺点，并能根据实际需求选择合适的方法来设计和实现数据存储方案。此外，书中还可能包含实例代码和实战项目，以帮助读者将理论知识转化为实际开发技能。" 以上是对Android数据库开发的概览，涵盖从基础到高级的主题，旨在提升开发者在构建数据驱动的Android应用时的能力和效率。

Preface

[ 5 ]

Errata

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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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