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
不应该尝试导入android.R。尝试修复XML文件中出现的所有错误，包括清单文件。当所有错误被清除后，R.java将重新出现。
其他回答
对我来说，这是因为错误的java编译器版本。 项目属性-> Java编译器，启用“启用项目特定设置”，并选择您的“编译器遵从级别”
So I have run into this problem multiple times when switching build targets. Usually doing a Project >> Clean worked for me. This last time, however, it did not. Finally I tried to open my default.properties file, located under the root project folder. I received an error message stating that it was out of sync with the file system. I actually deleted it and copied a coworkers version which allowed eclipse to rebuild my R file. I will paste what it looks like below. It is named 'default.properties'.
# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file must be checked in Version Control Systems.
#
# To customize properties used by the Ant build system use,
# "build.properties", and override values to adapt the script to your
# project structure.
# Indicates whether an apk should be generated for each density.
split.density=false
# Project target.
target=android-3
我有这个问题很多次，我发现有时“R不会解决”，因为:
一些坏的资源已经存在，例如:一个名为My image .png的图像 或者在资源中出现一些错误，比如在xml文件中出现错误，或者在你的表单中定义资源时出现错误。
在这种情况下，你甚至不能将你自己的包R导入到你的项目中。所以去你的资源文件夹，搜索以上两点。
这是可行的
要解决此问题，请转到java构建路径->order和Export，选中所有复选框，选择ok，然后清理并构建项目，导入包名R文件(Ex com.demo.R)。它的工作原理。
确保所有资源文件都没有大写扩展名。我发现我保存了一些带有大写扩展名。png的图像。我把它改成。png，一切都恢复正常了。
