androidmanifest.xml

....
  <permission android:name="appid.permission.C2D_MESSAGE" android:protectionLevel="signature" />
  <uses-permission android:name="appid.permission.C2D_MESSAGE"  android:protectionLevel="signature"/>
  <uses-permission android:name="android.permission.VIBRATE" />

  <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
  <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>


 <application
    android:name=".application"
    android:allowBackup="false"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:largeHeap="true"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:replace="android:theme,android:allowBackup"
    tools:ignore="GoogleAppIndexingWarning"
    android:launchMode="singleTop">
   
   
   <!--fcm-->
    <meta-data
      android:name="com.google.firebase.messaging.default_notification_icon"
      android:resource="@mipmap/ic_launcher"/>

    <meta-data
      android:name="com.google.firebase.messaging.default_notification_color"
      android:resource="@color/colorWhite"/>

    <meta-data
      android:name="com.google.firebase.messaging.default_notification_channel_id"
      android:value="channel-name"/>
   
   <service
      android:name=".gcm.MyFcmListenerService">
      <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT"/>
      </intent-filter>
    </service>
   
   ....
   
   </application