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我正在尝试基于 google map api v2 和 google places 制作一个应用程序，按照教程进行操作，我的应用程序运行良好。现在我添加了一段代码用于使用 places api 并在 log cat 中显示错误

    02-19 22:18:24.023: E/AndroidRuntime(21871): FATAL EXCEPTION: main
02-19 22:18:24.023: E/AndroidRuntime(21871): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.abhishekbietcs.locomap/com.abhishekbietcs.locomap.Mapme}: java.lang.NullPointerException
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.os.Looper.loop(Looper.java:130)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread.main(ActivityThread.java:3687)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at java.lang.reflect.Method.invokeNative(Native Method)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at java.lang.reflect.Method.invoke(Method.java:507)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at dalvik.system.NativeStart.main(Native Method)
02-19 22:18:24.023: E/AndroidRuntime(21871): Caused by: java.lang.NullPointerException
02-19 22:18:24.023: E/AndroidRuntime(21871):    at com.abhishekbietcs.locomap.Mapme.<init>(Mapme.java:48)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at java.lang.Class.newInstanceImpl(Native Method)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at java.lang.Class.newInstance(Class.java:1409)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-19 22:18:24.023: E/AndroidRuntime(21871):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
02-19 22:18:24.023: E/AndroidRuntime(21871):    ... 11 more

meinfest 是

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.abhishekbietcs.locomap"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<permission
    android:name="com.abhishekbietcs.locomap.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.abhishekbietcs.locomap.permission.MAPS_RECEIVE" />
<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" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.abhishekbietcs.locomap.Mapme"
        android:label="@string/title_activity_mapme" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.abhishekbietcs.locomap.Aboutus"
        android:label="@string/title_activity_mapme"
        android:theme="@android:style/Theme.Dialog" >
        <intent-filter>
            <action android:name="android.intent.action.ABOUT" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.abhishekbietcs.locomap.ViewPrefrence"
        android:label="@string/title_activity_mapme" >
        <intent-filter>
            <action android:name="android.intent.action.VIEWPREFRENCE" />

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

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

仪表板活动的 xml 是

<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"
tools:context=".Mapme" >

<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.SupportMapFragment" />

这是 oncreate 方法

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d("create","0");
    setContentView(R.layout.activity_mapme);
    SupportMapFragment mapFragment = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
    Log.d("create","1");
    googleMap = mapFragment.getMap();
    Log.d("create","2");
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    Log.d("create","3");
}

googlemap 变量是为整个活动定义的，我真的不明白出了什么问题，之前这个活动正在运行，现在它是强制关闭，拉我的头发请帮助我。提前谢谢

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