Using Apex Triggers to Send Push Notifications

1trigger caseAlert on Case (after update) {    
2    
3    for(Case cs : Trigger.New)  
4    {
5        // Instantiating a notification
6        Messaging.PushNotification msg = 
7            new Messaging.PushNotification();
8
9        // Assembling the necessary payload parameters for Apple.
10        // Apple params are: 
11        // (<alert text>,<alert sound>,<badge count>,
12        // <free-form data>)
13        // This example doesn't use badge count or free-form data.
14        // The number of notifications that haven't been acted
15        // upon by the intended recipient is best calculated
16        // at the time of the push. This timing helps
17        // ensure accuracy across multiple target devices.
18        Map<String, Object> payload = 
19            Messaging.PushNotificationPayload.apple(
20                'Case ' + cs.CaseNumber + ' status changed to: ' 
21                + cs.Status, '', null, null);
22
23        // Adding the assembled payload to the notification
24        msg.setPayload(payload);
25
26        // Getting recipient users
27        String userId1 = cs.OwnerId;
28        String userId2 = cs.LastModifiedById;
29
30        // Adding recipient users to list
31        Set<String> users = new Set<String>();
32        users.add(userId1);
33        users.add(userId2);                       
34
35        // Sending the notification to the specified app and users.
36        // Here we specify the API name of the connected app.  
37        msg.send('Test_App', users);
38    }
39}

1Map<String, Object> androidPayload = new Map<String, Object>();
2androidPayload.put('number', '1');
3androidPayload.put('name', 'test');