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不能自动生成的原因是如果你有这样的目录

res/drawable-hdpi, 
res/drawable-mdpi, 
res/drawable-ldpi.

image name should be in a proper way

检查映像名称并检查和布局/any.xml 和string.xml

2014-03-01 13:34:39

其他回答

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

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

删除main.out.xml。我是新手，还不知道这个文件是用来做什么的，但删除它解决了这个问题。

2010-07-11 21:57:31

这对我很管用。

我没有“import android”。R’在eclipse向导创建的全新项目中。默认的XML布局文件也是小写的。

问题是eclipse没有生成R.java。再多的清理/重新启动也没有任何效果。

我注释了setContentView和getMenuInflator调用，make成功后，Eclipse生成了R.java。

一旦生成了R.java，我就可以取消setContentView和getMenuInflator的注释。

2013-03-17 17:35:16

我认为问题出在layout.xml文件或import语句中。

请确保您没有导入R.android。，而不是导入R.YOUR PACKAGE NAME..

它会工作得很好。