问当应用程序在手机上运行时(从bin文件夹的.apk文件安装)，会显示灰色平铺屏幕

EN

   package com.example.lbs;

      import android.os.Bundle;
       import android.app.Activity;
      import android.view.Menu;
      import com.google.android.maps.MapActivity;

      public class MainActivity extends MapActivity {

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub
    return false;
}

 }

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

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

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

    <uses-library android:name="com.google.android.maps"    />    
    <activity
        android:name="com.example.lbs.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data
         android:name="com.google.android.maps.v2.API_KEY"
         android:value="AIzaSyCROYDMk81v3LCsQShUnMjnezyshJAvJdY"/>

  </application>

  <permission
    android:name="com.example.lbs.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>

 <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE"/>
  <uses-permission  android:name="android.permission.INTERNET"></uses-permission>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission          android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
 <!-- The following two permissions are not required to use
 Google Maps Android API v2, but are recommended. -->
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>"
 </manifest>

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context=".MainActivity" >

  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" />

  <com.google.android.maps.MapView 
    android:id="@+id/mapView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:enabled="true"
    android:clickable="true"
    android:apiKey="AIzaSyCROYDMk81v3LCsQShUnMjnezyshJAvJdY"  /> 


    </RelativeLayout>