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".
其他回答
我今天也遇到了同样的问题。我尝试使用sdk管理器执行所有sdk更新。完成并重新启动IDE后，问题已解决。
我尝试了这个帖子上的大部分选项(以及其他许多选项)，但没有一个对我有效。最后这个成功了，所以我想和大家分享一下……
我的机器上有多个版本的Eclipse IDE(因为我也从事与Android无关的项目)。我偶然地使用另一个Eclipse版本(非Android)使用的工作区创建了我的Android项目。由于这个原因，我猜有些奇怪的事情正在发生，我的R.java从未生成!
为了解决这个问题，我所做的就是创建一个新的工作空间，神奇地R.java开始生成，一切都很顺利……
所以，当你尝试所有其他选择时，也试试这个。希望这对你有用……
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".
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
希望这能帮助到一些人。
确保你安装了Android构建工具表单sdk管理器
项目右击属性-> Java BuildPath选择Library并添加android-support.jar。
转到项目->属性->Java构建路径，然后选择订单和导出选项卡。将android-support .jar库设置为选中，并将其置于列表顶部。清理和重建，它适用于大多数情况
