在Eclipse（Android版）错误：java.lang.String类型不能得到解决。这是间接地从必需的.class文件中引用 [英] Error in Eclipse (for Android): The type java.lang.String cannot be resolved. It is indirectly referenced from required .class files

问题描述

我试图运行，别人已经创造了一个Android项目。 我已经打开了该项目在Eclipse为：

I am trying to run an Android project that someone else has created. I have opened the project in Eclipse as:

File --> New --> Project --> Android Project from existing code

下面是前两行的Java文件之一：

Here are the first two lines of one of Java files:

package aa.bb.cc;

import java.io.File;

有这些行的开头红十字标志，当我将鼠标悬停他们，我得到这个消息的第一行：的java.lang.Object不能解析的类型。这是间接地从必需的.class文件中引用 anfd第二行得到这样的信息：导入java.net解决不了

There is red cross sign at the beginning of these lines and when I hold the mouse over them I get this message for the first line: The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files anfd for the second line get this message: The import java.net cannot be resolved.

的原因是什么？如何解决这些错误信息？

What is the reason and how can I resolve these error messages?

感谢。

推荐答案

执行一个步骤之前运行：

Do one more step before running:

Right Click(Project) -> Properties -> Java Build Path -> Libraries -> 
                                          Add Library -> Select the Java Library

点击确定，然后清洁构建（项目 - ＆GT;清洁＆安培; 项目 - ＆GT;全部构建或按Ctrl + B ）的项目。它应该是罚款。

Click OK and then clean-build (Project -> Clean & Project -> Build All or Ctrl+B) your project. It should be fine.

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