R.id不能在Android ListActivity解决 [英] R.id cannot be resolved on android ListActivity

问题描述

我得到这个奇怪的错误：

I am getting this strange error:

  R.id cannot be resolved 

这行：

 WebView myWebView = (WebView) findViewById(view.R.id.webview);
 myWebView.loadUrl(s);

我试图清理项目，并重新启动。
这里是我的code：

I tried to clean the project and restart it. here is my code:

public class NewsActivity  extends ListActivity {
 public ReadXML ReadXML=new ReadXML();
 public  ArrayList<String> ynetList =new ArrayList<String>();

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

for(int i=0;i<ReadXML.hadashotListItems.size();i++)
ynetList.add(ReadXML.hadashotListItems.get(i).title+"\n"+ReadXML.hadashotListItems.get(i).pubDate);

      setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, ynetList));
    //  setContentView(R.layout.main);
      ListView lv = getListView();
      lv.setTextFilterEnabled(true);

      lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
          // When clicked, show a toast with the TextView text
        String s=   ReadXML.hadashotListItems.get(position).link;

        WebView myWebView = (WebView) findViewById(view.R.id.webview);
        myWebView.loadUrl(s);
    //


      //Toast.makeText(getApplicationContext(((TextView)view).getText(),Toast.LENGTH_SHORT).show();
        }
      }
      );
    }}

我的XML code是：
list_item.xml

my xml code is: list_item.xml

  <?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="15sp" >
</TextView>


<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>

</LinearLayout>

感谢您的帮助！

推荐答案

消息 R.id无法解析表示研究类是不正确建立，或者至少是不能根据文件 list_item.xml ，因为它定义了一个 ID 。

The message R.id cannot be resolved means that the R class is not properly built or at least is not according to your file list_item.xml as it defines an id.

可能的原因有以下几点：

The probable causes are the following:

• Eclipse是丢失，不管理才能正确地构建您的项目（这种情况发生的某个时候）：尝试清理和重建项目（菜单项目/干净的Eclipse）。

• Eclipse is lost and does not manage to build your project properly (this happens sometime): try to clean and rebuild your project (menu project/clean of Eclipse).

有时候，这是不够要么，所以尽量

Sometimes this is not sufficient either, so try to

• 清洁你的项目


• 修改的Andr​​oidManifest.xml 通过添加它的空白字符


• 关闭项目在Eclipse


• 再次打开它


• 重新清理，并建立它

• clean you project
• modify your AndroidManifest.xml by adding a blank char in it
• Close your project in Eclipse
• Open it again
• Re-clean it and build it

• 您文件 list_item.xml 是不是在正确的目录。它应该是在目录 [project_root] / RES /布局

• Your file list_item.xml is not in the right directory. It should be in the directory [project_root]/res/layout

您有一个Android框架的安装问题。检查菜单的Eclipse的Windows / Android SDK和ADT经理是否一切正常。

You have an Android framework installation problem. Check in the menu "Windows/Android SDK and ADT manager" of Eclipse whether everything is fine.

这篇关于R.id不能在Android ListActivity解决的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！