How to determine if Android App open from Notifica

问题:

In general, when i have notification message on the notification bar and click on it. It open the registered App for that message.

On Startup's Activity, How to determine if App is open from it?

and more better is How to retrieve the notification's id on the OnCreate() method?

Update: from @Ovidiu - here is my code to putExtra to push

       Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());
       notification.contentView = contentView;

       Intent notificationIntent = new Intent(this, Startup.class);
       notificationIntent.putExtra("JOBID", jobId);

       PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);

       notification.flags = Notification.FLAG_AUTO_CANCEL;
       notification.contentIntent = contentIntent;


       mNotificationManager.notify(jobId, notification);

and on Main Activity "Startup.java" code is

    Intent intent = this.getIntent();
    if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey("JOBID")) {
        int jobID = this.getIntent().getExtras().getInt("JOBID");

        if (jobID > 0) {

        }
    }

intent.getExtras() always return null. Turn out, I need to pass PendingIntent.FLAG_ONE_SHOT . It is now passed along!!

回答1:

You need to use putExtra(ID_KEY,id) when you create your Intent for starting your application, and in your onCreate() method you can use getIntent().getExtras().getInt(ID_KEY); to retrieve your passed id integer.

回答2:

The Start Activity code would be like this, otherwise after once it comes from GCM notification, from then every time the Activity comes from the Recent list, it will say it comes from GCM notification, which is wrong.

Intent intent = this.getIntent();
if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey("JOBID") && (intent.getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {
    int jobID = this.getIntent().getExtras().getInt("JOBID");

    if (jobID > 0) {

    }
}

回答3:

I Had the same problem, and I don't understand why I have to use putExtra method... So I solved like this: when you receive a notification and tap on it, the app will open (usually it opens the app main activity) and, in the extras, you can find some information about that notification. You can add key/value params to the notifications you're sending to registered devices. These params will be added to the intent extras.

So you can act like this: in your notification, add a parameter that represents your notification id. For esample "messageId" -> "abc", where abc is your notification identifier.

Then, in your main activity, you can do:

if (getIntent().getExtras().keySet().contains("messageId")) {
    // you opened the app from a notification
    String messageId = getIntent().getStringExtra("messageId")
    // do domething...
} else {
    // you opened the app normally
    // do domething...
}

And you will retrieve the id of the notification. So you can use this information to, for example, get the notification from your db or other operations.