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我是 android 应用程序开发的新手，想创建一个使用谷歌地图的应用程序。我在这里直接按照谷歌的说明进行操作：https ://developers.google.com/maps/documentation/android/start

但我在日志中收到以下错误：

W/ResourceType( 1984): Bad XML block: header       size 84 or total size 0 is larger than data size 0
W/ResourceType( 1984): Bad XML block: header size 85 or total size 5506544 is larger than data size 0
C:\adt-bundle-windows-x86_64\eclipse\wrkspc\mapappexplore\res\menu\activity_main.xml:3: error: No resource identifier found for attribute 'showAsAction' in package 'android'
C:\adt-bundle-windows-x86_64\eclipse\wrkspc\mapappexplore\res\menu\activity_map.xml:3: error: No resource identifier found for attribute 'showAsAction' in package 'android'

据我所知，我完全按照说明进行操作。这是我的代码：

MainActivity.java - 最后一行出现错误“R 无法解析为变量”

package com.example.mapappexplore;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
}

Androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mapappexplore"
android:versionCode="1"
android:versionName="1.0" >

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<!-- opengl -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>


<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17"/>

    <permission
      android:name="com.example.mapappexplore.permission.MAPS_RECEIVE"
      android:protectionLevel="signature"/>
    <uses-permission android:name="com.example.mapappexplore.permission.MAPS_RECEIVE"/>

<application

    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >



             <activity
             android:name="com.example.mapappexplore.MainActivity"
            android:label="@string/app_name" >

                    <intent-filter> 
                         <action android:name="android.intent.action.MAIN" />
                        <category android:name="android.intent.category.LAUNCHER" />
                    </intent-filter>
             <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyAotiEiJVqDsCBYb3pHHhZUMlFz2eWSKTE"/>
             </activity>
</application>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  class="com.google.android.gms.maps.MapFragment"/>
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