Android 应用程序数据库编程实践指南

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英文版 Android 数据库编程本书《英文版 Android 数据库编程》由 Jason Wei 撰写，是一本关于 Android 数据库编程的实践性教程。下面是对该书的知识点总结： **Android 数据库概述** Android 作为一个移动操作系统，数据存储和管理是其核心组件之一。Android 数据库是指在 Android 平台上存储和管理数据的机制。Android 数据库可以分为两类：内部存储和外部存储。内部存储是指存储在 Android 设备内部的数据，而外部存储是指存储在 SD 卡或其他外部存储设备上的数据。 **Android 数据库编程** Android 数据库编程是指使用 Java 或 Kotlin 语言编写的程序来访问和操作 Android 数据库。Android 提供了多种方式来访问和操作数据库，包括使用 SQLite 数据库、ContentProvider 和文件存储等。 **SQLite 数据库** SQLite 是一个轻量级的关系数据库管理系统，广泛应用于 Android 平台。SQLite 数据库可以存储大量数据，并提供了基本的数据库操作，例如创建、读取、更新和删除数据。 **ContentProvider** ContentProvider 是 Android 平台提供的一种机制，用于访问和操作系统级别的数据。ContentProvider 可以提供数据的 CRUD（Create、Read、Update、Delete）操作。 **文件存储** 文件存储是指将数据存储在 Android 设备的文件系统中。文件存储可以使用 Java 的文件输入/输出流来实现。 **Android 数据库编程实践** 本书提供了实践性教程，指导读者如何使用 Java 或 Kotlin 语言编写 Android 数据库编程程序。通过阅读本书，读者可以学习如何使用 SQLite 数据库、ContentProvider 和文件存储等机制来访问和操作 Android 数据库。 **作者简介** Jason Wei 是一名经验丰富的 Android 开发者和作者，拥有多年 Android 开发经验。他的作品包括多本 Android 相关书籍和文章。 **出版信息** 本书由 Packt Publishing 出版，版权所有，任何形式的复制、存储或传输均需获得出版社的书面许可。

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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