R无法解决- Android错误

我刚刚下载并安装了新的Android SDK。我想创建一个简单的应用程序来测试它。

向导创建了以下代码:

package eu.mauriziopz.gps;

import android.app.Activity;
import android.os.Bundle;

public class ggps extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

但是Eclipse给出了错误

R不能被分解

在网上

setContentView(R.layout.main);

Why?

PS:我在res/layout/下有一个名为main.xml的XML文件。

当前回答

R.java是Android Eclipse插件创建的文件构建应用程序。R.java是在“gen”下创建的目录中。此文件由“res”中的信息生成。目录中。如果在Eclipse上运行select“Project”->“Clean… 菜单，它将删除，然后重新生成R.java文件。

“R不能被解决”的问题发生在你改变你的在AndroidManifest.xml文件中的包名。它使用安卓系统包名下创建子目录“gen”目录，其中它存储R.java文件。

Eclipse may have problems executing clean, because it is confused about where the R.java file is when you have changed the Android package name. You can either rename the subdirectory under gen to match your new package name, or you can change your package name back to the old name. Do the clean and then change the package name to the new name you want. This works best if you stop Eclipse from trying to build while you are changing the package name. Under the "Project" menu uncheck the option to "Build Automatically" and also when the "Clean..." dialog asks if it should "Start a build immediately" uncheck the box so it doesn't try to build while you are changing the package name. After you have changed the name you can turn "Build Automatically" back on again.

Note that if your AndroidManifest.xml file package name does not match your Java package name, Eclipse will end up automatically adding an "import <your Android package name>.R;" line in all your .java files that have any references to R. If you change your AndroidManifest.xml package name, sometimes Eclipse does not update all of these added imports. If that happens, use the Eclipse refactoring (ALT + Shift + R) to change the import statement in one of your Java files to your new AndroidManifest.xml package name. It is best to do this while you have disabled "Build Automatically".

2010-03-04 18:37:14

其他回答

对我来说有用的是安装“Android SDK Build-tools”。打开Android SDK管理器，安装Android SDK构建工具。它还帮助更新了Eclipse中的android开发平台:帮助>检查更新

2013-12-08 19:31:03

我尝试了上面的大多数方法，但对我的情况不起作用

最后我发现adb输了

对于MAC OS，进入android SDK目录

输入。/adb start-server

2013-05-18 03:36:34

这个错误突然出现在我的x64 Linux Mint安装中。结果是ADB二进制文件失败，因为没有安装ia32-libs包。只需运行apt-get install ia32-libs并重新启动Eclipse即可修复该错误。

如果你的x64发行版没有ia32-libs，你将不得不使用Multiarch。

检查这篇文章的#4和#5: http://crunchbang.org/forums/viewtopic.php?pid=277883#p277883