안녕하세요 안드로이드를 독학한지 3주 정도 된 초보입니다.
	단순히 예제만보고 gcm을 써볼려고 하는데요 
	메니페스트작성중에
	Cannot resolve symbol 'GcmBroadcastReceiver'
	Cannot resolve symbol 'GcmIntentService'
	라고 나오는데 뭐가 문제인지 모르겠어요 ㅠ
	안드로이드 스튜디오를 사용중이구요 
	sdk로 Google Play Service 설치도 됬는데 왜 이러는 건지 모르겠네요
	 
	* build.gradle 에 추가한 내용입니당
	 
	
		dependencies {
	
		    compile fileTree(dir: 'libs', include: ['*.jar'])
	
		    compile 'com.android.support:appcompat-v7:21.0.3'
	
		 
	
		    compile 'com.google.android.gms:play-services:6.5.87' //이것만 추가했어요
	
		 
	
		}
	
		 
	
		 
	
		*manifest.xml
	
		
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ch.mygcm" >
    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17"/>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <permission android:name="com.example.ch.mygcm.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />
    <uses-permission android:name="com.example.ch.mygcm.permission.C2D_MESSAGE" />
    <uses-permission
        android:name="com.google.android.c2dm.permission.RECEIVE" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
        <activity
            android:name=".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>
        <receiver
            android:name=".GcmBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <category android:name="com.example.ch.mygcm" />
            </intent-filter>
        </receiver>
        <service android:name=".GcmIntentService" />
    </application>
</manifest>
		
			
		
			 
	 
 
	해결방법을 제시해주시면 감사하겠습니다!