Android开发之目录结构
http://assets.daily.kelude.taobao.net/k2/doc/light_talk/android/directory_structure.GIF[*]1、与一般的JAVA项目一样，src文件夹是项目的所有包及源文件（.java）。
[*]2、gen文件夹中包含了一个R.java，这个文件夹及类是在建立项目时自动生成的，这个文件是只读模式，R.java文件是定义该项目所有的资源文件的索引文件。
<div class="highlight" style="color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 13px; line-height: 18px;">/* AUTO-GENERATED FILE.DO NOT MODIFY. * * This class was automatically generated by the * aapt tool from the resource data it found.It * should not be modified by hand. */package com.example.practice;public final class R { public static final class attr { } public static final class drawable { public static final int ic_launcher=0x7f020000; } public static final class id { public static final int menu_settings=0x7f070002; public static final int ok=0x7f070001; public static final int show=0x7f070000; } public static final class layout { public static final int activity_main=0x7f030000; } public static final class menu { public static final int activity_main=0x7f060000; } public static final class string { public static final int app_name=0x7f040000; public static final int hello=0x7f040003; public static final int hello_world=0x7f040001; public static final int menu_settings=0x7f040002; } public static final class style { public static final int AppBaseTheme=0x7f050000; public static final int AppTheme=0x7f050001; }}
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