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how can we get device token for android for push notification?

我想在我的应用程序中实现推送通知。我想知道,在启用谷歌云消息传递API后,我们如何在Android中获取推送通知的设备令牌。我们如何获得特定设备的设备令牌?

try {
     InstanceID instanceID = InstanceID.getInstance(this);

     String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId),
                    GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);

            Log.i(TAG, "GCM Registration Token: " + token);

}catch (Exception e) {
            Log.d(TAG, "Failed to complete token refresh", e);
}

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