导入的Eclipse项目没有编译

Question

我在新的Windows 8中安装了Eclipse 4.2,并复制并导入了我的所有项目.所有项目都基于phonegap,所以有了phonegap构建

没有人会编译并且src> app.java都有红色X,尽管它们在原始日食中工作正常.

我不明白错误,所以不知道从哪里开始:

我的代码:()中的行的错误不是代码的一部分

package com.x.x;
import android.os.Bundle;         (ERROR=The import android.os.Bundle cannot be resolved)
import com.phonegap.*;
public class App extends DroidGap {         (ERROR= The hierarchy of the type App is inconsistent)
/** Called when the activity is first created. */
@Override                       (ERROR = Override cannot be resolved to a type)
public void onCreate(Bundle savedInstanceState) {      (ERROR=Bundle cannot be resolved to a type)
    super.onCreate(savedInstanceState);
    super.loadUrl("file:///android_asset/www/index.html");   (ERROR = The method loadUrl(String) from the type DroidGap refers to the missing type String)
}
}

错误第1行:

     Multiple markers at this line
- The type android.os.Bundle cannot be resolved. It is indirectly referenced from 
 required .class files
- The type android.content.Intent cannot be resolved. It is indirectly referenced from 
 required .class files
- The type java.lang.String cannot be resolved. It is indirectly referenced from 
 required .class files
- The type java.lang.Object cannot be resolved. It is indirectly referenced from 
 required .class files

Answer 1

第一步是解决您的JRE设置,这显然不是有序的(java.lang.Object无法解决).打开项目属性,Java Build Path,Libraries,并在列表中找到引用JRE的项目.编辑此条目.您可能需要在文件系统上找到JRE.