Android 为什么运行时无法识别在"；中定义的字符串；res/values/strings.xml“；

我有一项活动：

public class Notepadv1 extends ListActivity {

   public static final int INSERT_ID = Menu.FIRST;
   ...
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {

        boolean result = super.onCreateOptionsMenu(menu);

        menu.add(0, INSERT_ID, 0, R.string.menu_insert); //problem here

        return result;
    }
  ...
}

my

res/values/strings.xml

：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">Notepad v1</string>
    <string name="no_notes">No Notes Yet</string>
    <string name="menu_insert">Add Item</string>
</resources>

---

android运行时似乎无法重新格式化在

res/values/strings.xml

中定义的“菜单插入”值，为什么？我错在哪里？

清理项目（项目->清理）可能会有所帮助。

在再次运行之前，是否尝试清理和刷新项目？

E/AndroidRuntime(  631): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime(  631): android.content.res.Resources$NotFoundException: String resource ID #0x7f040002
E/AndroidRuntime(  631):    at android.content.res.Resources.getText(Resources.java:200)
E/AndroidRuntime(  631):    at android.content.res.Resources.getString(Resources.java:253)
E/AndroidRuntime(  631):    at com.android.internal.view.menu.MenuBuilder.add(MenuBuilder.java:397)
E/AndroidRuntime(  631):    at com.android.demo.notepad1.Notepadv1.onCreateOptionsMenu(Notepadv1.java:55)
E/AndroidRuntime(  631):    at android.app.Activity.onCreatePanelMenu(Activity.java:2123)
E/AndroidRuntime(  631):    at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:305)
E/AndroidRuntime(  631):    at com.android.internal.policy.impl.PhoneWindow.onKeyDownPanel(PhoneWindow.java:550)
E/AndroidRuntime(  631):    at com.android.internal.policy.impl.PhoneWindow.onKeyDown(PhoneWindow.java:1192)
E/AndroidRuntime(  631):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1636)
E/AndroidRuntime(  631):    at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2368)
E/AndroidRuntime(  631):    at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2338)
E/AndroidRuntime(  631):    at android.view.ViewRoot.handleMessage(ViewRoot.java:1641)
E/AndroidRuntime(  631):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  631):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(  631):    at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime(  631):    at java.lang.reflect.Method.invokeNative(Native Method)
...