首先检查资源文件是否有任何错误，如果是这样，则不会生成R.java。检查是否已将您的adt更新为rev 22。如果是这样，请按照以下说明

右键单击项目goto属性Java构建路径选择订单导出选项卡确保选择了Android私有库，如果已经引用图书馆项目也为图书馆项目做同样的工作。清理和构建。

还要转到android sdk管理器，并检查您是否安装了安卓的sdk构建工具。这很多不是必需的，但请确保您已安装Android构建工具。

检查以下链接

Eclipse错误：R无法解析为变量

I am running Eclipse 4.2.2 Juno on Windows 64-bit for development on Android SDK 17 with ADT. Just today, I cleaned a working project, only to find that the R.java file would no longer generate.

This problem has a very divergent list of possible causes. User Gray, in response to the thread located here, listed a set of articles, all addressing different possible causes.

He says:

Dont worry. First you may clean the project, then run the project. If this does not work then follow the following links:

And then proceeds to list articles pertaining to different causes of this problem, the links to which I am unable to include, but can be found in the question linked to above.

Gray's comment is a good summary of the most common causes to this problem, including resource file naming convention, the erroneous "import Android.R" statement, XML errors, corruption requiring cleaning and rebuilding, and checking the Android SDK in Project -> Properties -> Java Build Path / Libraries.

The problem is, my R.java still doesn't generate! The only remaining possibility within Gray's list seems to be that either my main.xml or AndroidManifest.xml is broken, so I have included them to make sure I didn't miss any errors.

My main layout:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.bostonwalker.sseng.SSSurfaceView
    android:id="@+id/ssview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</FrameLayout>

And my manifest:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.bostonwalker.enginedev"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"    >"
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

As a beginner Android programmer, this is beyond my capability to debug. Can someone please find an explanation?

First check if there are any errors in your resource file's. R.java will not be generated if that's the case. Check if you have updated your adt to rev 22. If so follow the below

Right click on your project goto properties. Java Build Path. Choose Order export tab. Make sure that Android Private Libraries is selected. If you have referenced library project. do the same for the library project also. Clean and Build.

Also goto android sdk manager and check that you have the android sdk build tools installed. This many not be necessary but make sure you have android build tools installed.

Check the link below

Eclipse error: R cannot be resolved to a variable