R.xml。preferences无法找到？ [英] R.xml.preferences cannot be found?

问题描述

我试图建立一些简单的preferences一个Android应用程序，但不能让过去这个错误：XML不能得到解决，或者不是一个领域。我已经清洗，刷新，重新启动Eclipse和跳舞跳汰 - 但我不能动摇的错误。我究竟做错了什么？

I'm trying to set up some simple preferences for an Android app, but can't get past this error: "xml cannot be resolved or is not a field." I have cleaned, refreshed, restarted eclipse, and danced the jig - but I can't shake the error. What am I doing wrong?

在preferences.xml文件：

The preferences.xml file:

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

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory
        android:title="Dev options">

        <CheckBoxPreference
            android:key="devtools"
            android:title="Enable clearing user"
            android:summary="Enable clearing user" />

    </PreferenceCategory>

</PreferenceScreen>

Java类文件：

The java class file:

package com.myapp.prototype;

import android.os.Bundle;
import android.preference.PreferenceFragment;

public class GCPreferencesActivity extends PreferenceFragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Load preferences from XML resource
        addPreferencesFromResource(R.xml.preferences);    // error on this line ??
    }
}

感谢您的帮助。

Thanks for any help.

推荐答案

我想你已经错过了一个进口（如文森特说，在评论）。你应该增加：

I think you have missed an import (as said Vincent in comments). you should add:

import com.myapp.prototype.R;

此错误还出现，如果你把你的code：

The error also appears if your put in your code:

import android.R;

这是令人困惑，因为R被解决，但没有你在XML文件中定义的属性（当然，这是不好的 - [R！）。

which is confusing because R is resolved but has no attribute that you defined in your XML file (of course, it is not the good R !).

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