Send push notifications from server with FCM

Question

Recently I asked a question on sending push notifications using GCM: Send push notifications to Android. Now that there is FCM, I am wondering how different it would be from

Answer 1

public class SendPushNotification extends AsyncTask {

    private final String FIREBASE_URL = "https://fcm.googleapis.com/fcm/send";
    private final String SERVER_KEY = "REPLACE_YOUR_SERVER_KEY";
    private Context context;
    private String token;

    public SendPushNotification(Context context, String token) {
        this.context = context;
        this.token = token;
    }

    @Override
    protected Void doInBackground(Void... voids) {

        /*{
            "to": "DEVICE_TOKEN",
            "data": {
            "type": "type",
                "title": "Android",
                "message": "Push Notification",
                "data": {
                    "key": "Extra data"
                }
            }
        }*/

        try {
            URL url = new URL(FIREBASE_URL);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            connection.setUseCaches(false);
            connection.setDoInput(true);
            connection.setDoOutput(true);

            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Accept", "application/json");
            connection.setRequestProperty("Authorization", "key=" + SERVER_KEY);

            JSONObject root = new JSONObject();
            root.put("to", token);

            JSONObject data = new JSONObject();
            data.put("type", "type");
            data.put("title", "Android");
            data.put("message", "Push Notification");

            JSONObject innerData = new JSONObject();
            innerData.put("key", "Extra data");

            data.put("data", innerData);
            root.put("data", data);
            Log.e("PushNotification", "Data Format: " + root.toString());

            try {
                OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
                writer.write(root.toString());
                writer.flush();
                writer.close();

                int responseCode = connection.getResponseCode();
                Log.e("PushNotification", "Request Code: " + responseCode);

                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader((connection.getInputStream())));
                String output;
                StringBuilder builder = new StringBuilder();
                while ((output = bufferedReader.readLine()) != null) {
                    builder.append(output);
                }
                bufferedReader.close();
                String result = builder.toString();
                Log.e("PushNotification", "Result JSON: " + result);
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("PushNotification", "Error: " + e.getMessage());
            }

        } catch (Exception e) {
            e.printStackTrace();
            Log.e("PushNotification", "Error: " + e.getMessage());
        }

        return null;
    }
}

Use

SendPushNotification sendPushNotification = new SendPushNotification(context, "token");
sendPushNotification.execute();