Notification for a new news. Remember this news until unread.

Hello everyone.

I just did a push notification system that works.

Now I want when a notification is sent to a new news reported on the application, as long as the user has not seen the new article that it is displayed as "unread".

Should we keep a file. JSON that the article is "unread" or what is the right way? Thanks.

My code for notification:

///////////
// Modules requiring
var isAndroid = false;
if (Ti.Platform.name == 'android') 
{
    isAndroid = true;
    var CloudPush = require('ti.cloudpush');
}
var Cloud = require("ti.cloud");
var deviceToken = null;
 
 
// Token reception
if (isAndroid)
{
    CloudPush.retrieveDeviceToken({
        success: deviceTokenSuccess,
        error: deviceTokenError
    });
}
 
else
{
    Titanium.Network.registerForPushNotifications({
        types: [
            Titanium.Network.NOTIFICATION_TYPE_BADGE,
            Titanium.Network.NOTIFICATION_TYPE_ALERT,
            Titanium.Network.NOTIFICATION_TYPE_SOUND
        ],
        success:deviceTokenSuccess,
        error:deviceTokenError,
        callback:function(e){
            // called when a push notification is received (on ios)
            notificationReceived(e);
        }
    });
}
function deviceTokenSuccess(e)
{
    deviceToken = e.deviceToken;
    loginCloud();
}
function deviceTokenError(e)
{
    //alert('Error during token reception : ' + e.error);
}
 
// Login the user
function loginCloud(){
    Cloud.Users.login(
    {
        login: 'mylogin',
        password: 'mypassword'
    }, function (e) 
    {
        if (e.success){
            subscribe();
        }
 
        else
           Ti.API.info('Error: ' +((e.error && e.message) || JSON.stringify(e)));
 
    });
}
 
// Subscribe to channel
function subscribe(){
    Cloud.PushNotifications.subscribeToken(
    {
        device_token: deviceToken,
        channel: "newAlert",
        type: Ti.Platform.name == 'android' ? 'android' : 'ios'
    }, function (e) {
        if (e.success)
            Ti.API.info('Subscribed to a channel');
 
        else
            Ti.API.info('Error:\n' + ((e.error && e.message) || JSON.stringify(e)));
    });
}
 
 
// Notification reception
if (isAndroid){
    // Process incoming push notifications for android
    CloudPush.addEventListener('callback', function (evt) {
        notificationReceived(evt);
    });
}
 
function notificationReceived(e)
{
    alert(e.data);
    // Your code to execute when a notification is received
}
///////////