Android图片处理源码深度解析 文章

随着移动设备的普及，Android系统逐渐成为了全球最受欢迎的操作系统之一。在Android应用开发过程中，图片处理是不可或缺的一部分。本文将深入解析Android图片处理的源码，帮助开发者更好地理解和运用图片处理技术。

一、Android图片处理概述

Android中的图片处理主要涉及到以下几个模块：

1.Bitmap：表示一个位图，是Android中处理图片的基本数据结构。

2.Canvas：用于在位图上绘制图形、文本等。

3.Paint：用于绘制图形、文本等。

4.BitmapFactory：用于解析和创建Bitmap。

5.ImageDecoder：用于解析和创建Bitmap。

6.BitmapShader：用于将Bitmap作为画布的填充图案。

二、Bitmap源码解析

Bitmap是Android中处理图片的基本数据结构，以下是Bitmap类的部分源码：

`java public class Bitmap implements Cloneable, Parcelable { private static final int DEFAULTBUFFERSIZE = 0; private static final int DEFAULTMINMEMORY = 0; private static final int MAXWIDTH = Integer.MAXVALUE; private static final int MAXHEIGHT = Integer.MAXVALUE; private static final Bitmap.Config DEFAULTCONFIG = Bitmap.Config.ARGB8888; private static final int DEFAULTALLOCATEMEMORY = 0; private static final int MINMEMORY = 12; private static final int MAXMEMORY = 1024; private static final int MINBUFFERSIZE = 256; private static final int MAXBUFFERSIZE = 0x7FFFFFFF; private static final int BUFFERSIZEFACTOR = 8; private static final int INITIALMINMEMORY = 16; private static final int INITIALMAXMEMORY = 128; private static final int INITIALBUFFERSIZE = 64; private static final int MAXRESTARTCOUNT = 3; private static final int MINRESTARTCOUNT = 2; private static final int MINMEMORYFACTOR = 2; private static final int MAXMEMORYFACTOR = 8; private static final int INITIALMINMEMORYFACTOR = 4; private static final int INITIALMAXMEMORYFACTOR = 8; private static final int MAXRESTARTMEMORYFACTOR = 4; private static final int MINRESTARTMEMORYFACTOR = 2; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; 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private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; 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private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int MINBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIALBUFFERSIZEFACTOR = 2; 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private static final int MAXBUFFERSIZEFACTOR = 16; private static final int INITIAL_BUFFER