Android项目工程目录说明

一、Android项目工程目录说明





二、R.java


R.java 资源索引文件

/* 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.hello;

public final class R {
    public static final class attr {
    }
    public static final class dimen {
        /**  Default screen margins, per the Android Design guidelines. 

         Customize dimensions originally defined in res/values/dimens.xml (such as
         screen margins) for sw720dp devices (e.g. 10" tablets) in landscape here.
    
         */
        public static final int activity_horizontal_margin=0x7f040000;
        public static final int activity_vertical_margin=0x7f040001;
    }
    public static final class drawable {
        public static final int ic_launcher=0x7f020000;
    }
    public static final class id {
        public static final int action_settings=0x7f080000;
    }
    public static final class layout {
        public static final int activity_main=0x7f030000;
    }
    public static final class menu {
        public static final int main=0x7f070000;
    }
    public static final class string {
        public static final int action_settings=0x7f050001;
        public static final int app_name=0x7f050000;
        public static final int hello_world=0x7f050002;
    }
    public static final class style {
        /** 
        Base application theme, dependent on API level. This theme is replaced
        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
    

            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        

        Base application theme for API 11+. This theme completely replaces
        AppBaseTheme from res/values/styles.xml on API 11+ devices.
    
 API 11 theme customizations can go here. 

        Base application theme for API 14+. This theme completely replaces
        AppBaseTheme from BOTH res/values/styles.xml and
        res/values-v11/styles.xml on API 14+ devices.
    
 API 14 theme customizations can go here. 
         */
        public static final int AppBaseTheme=0x7f060000;
        /**  Application theme. 
 All customizations that are NOT specific to a particular API-level can go here. 
         */
        public static final int AppTheme=0x7f060001;
    }
}

1、每一类型的资源对应于R文件中的一个内部类

ex：layout 布局文件 public static final class layout

strings 字符 public static final class string

drawable 图片资源 public static final class drawable

dimens 尺寸文件 public static final class dimen

… …

2、引用资源时可通过R文件索引

ex： 引用布局文件 R.layout.activity_main

引用菜单文件 R.menu.main



三、AndroidManifest.xml 应用清单文件

<?xml version="1.0" encoding="utf-8"?>
<!-- 根元素,manifest :注意关键属性package配置app的包名，一个app由包名+签名确定该app在android系统中唯一标识 -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.hello"
    android:versionCode="1"
    android:versionName="1.0" >

    <!-- uses-sdk :app应用的android版本信息，其中目标版本需配合project.properties文件 -->
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
    
    <!-- uses-permission :声明运行该app应用需要的权限 -->
    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.hello.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                
                <!-- 只有下面配置的intent，标示是该app的启动入口 -->
                <action android:name="android.intent.action.MAIN" />	<!-- app应用入口 -->
                <category android:name="android.intent.category.LAUNCHER" />
                
            </intent-filter>
        </activity>
    </application>

</manifest>