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

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

2010-06-14 15:13:09

其他回答

R在android项目中是自动生成的资源，有时会发生这种情况，不知道为什么，但你试着从项目中自动生成选项

删除其他项目或android.r文件的其他导入 =>总是记住，如果你总是面临自动生成id或自动删除R文件的问题，你可以生成静态id，如字符串文件，并使用@id而不是@+id

2015-03-05 13:26:46

我也有同样的问题。在我的情况下，必须与布局XML文件名。我有一些大写字母的文件名:

xml -没有工作!

xml -正常工作!

2010-09-20 06:38:37

最简单的解决方案——有时您只需要保存正在处理的XML文件，就可以启动自动生成程序。

保存文件(例如main.xml)，然后删除R.java文件，看看重新生成的R.java是否解决了R. resolve问题。

2010-06-01 01:47:25