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我有这个标准代码在用户第一次运行应用程序时运行：

    GCMRegistrar.checkDevice(this);
    GCMRegistrar.checkManifest(this);

    final String regId = GCMRegistrar.getRegistrationId(this);
    if (regId.equals("")) 
    {
        GCMRegistrar.register(this, SENDER_ID);
    } 
    else 
    {
        Log.v(TAG, "Already registered");
    }

并且 regId 始终为空，据我了解，这意味着设备未注册。

但是如何确保设备已注册？

谢谢！

编辑：

这是我关于云消息传递的清单部分：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.problemio"
    android:versionCode="82"
    android:versionName="2.2.82" >

    <supports-screens  android:largeScreens="true"   android:normalScreens="true"  android:smallScreens="true"/> 

    <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="16"/>
    <!-- <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="xx"/>  -->

    <uses-permission android:name="android.permission.INTERNET" />

    <!-- Required permission to use in-app billing. -->
    <uses-permission android:name="com.android.vending.BILLING" />



    <permission android:name="com.problemio.permission.C2D_MESSAGE" 
        android:protectionLevel="signature" />
    <uses-permission android:name="com.problemio.permission.C2D_MESSAGE" />


    <!-- App receives GCM messages. -->
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> 
    <!-- GCM requires a Google account. -->
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <!-- Keeps the processor from sleeping when a message is received. -->
    <uses-permission android:name="android.permission.WAKE_LOCK" /> 







    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
        android:theme="@style/CustomTheme" 
        android:name="MyApplication"
        android:debuggable="true"
                >

        <!--  For Google Cloud Messaging -->
        <receiver android:name="com.google.android.gcm.GCMBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND" >
          <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
                <category android:name="com.problemio" />
          </intent-filter>
        </receiver>   

        <service android:name=".GCMIntentService" />
        <!--  End of Google Cloud Messaging -->
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