How to send Device to device notification by using FCM without using XMPP or any other script.?

Question

Is there any way to send Upstream notification message through FCM from one android device to another devices connected with Firebase database.

I kn

Answer 1

After lots of try finally i got one solution and its work perfectly

Step 1 :Include two library.

compile 'com.squareup.okhttp3:okhttp:3.4.1'
compile 'com.google.firebase:firebase-messaging:9.2.0'

Step 2 : In your MainActivity or from where you want to send notifications.

OkHttpClient mClient = new OkHttpClient();

String refreshedToken = "";//add your user refresh tokens who are logged in with firebase.

JSONArray jsonArray = new JSONArray();
jsonArray.put(refreshedToken);

Step 3: Create one async task which sends notifications to all devices.

public void sendMessage(final JSONArray recipients, final String title, final String body, final String icon, final String message) {

        new AsyncTask() {
            @Override
            protected String doInBackground(String... params) {
                try {
                    JSONObject root = new JSONObject();
                    JSONObject notification = new JSONObject();
                    notification.put("body", body);
                    notification.put("title", title);
                    notification.put("icon", icon);

                    JSONObject data = new JSONObject();
                    data.put("message", message);
                    root.put("notification", notification);
                    root.put("data", data);
                    root.put("registration_ids", recipients);

                    String result = postToFCM(root.toString());
                    Log.d("Main Activity", "Result: " + result);
                    return result;
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(String result) {
                try {
                    JSONObject resultJson = new JSONObject(result);
                    int success, failure;
                    success = resultJson.getInt("success");
                    failure = resultJson.getInt("failure");
                    Toast.makeText(MainActivity.this, "Message Success: " + success + "Message Failed: " + failure, Toast.LENGTH_LONG).show();
                } catch (JSONException e) {
                    e.printStackTrace();
                    Toast.makeText(MainActivity.this, "Message Failed, Unknown error occurred.", Toast.LENGTH_LONG).show();
                }
            }
        }.execute();
    }

String postToFCM(String bodyString) throws IOException {



   public static final String FCM_MESSAGE_URL = "https://fcm.googleapis.com/fcm/send";
      final MediaType JSON
                = MediaType.parse("application/json; charset=utf-8");

        RequestBody body = RequestBody.create(JSON, bodyString);
        Request request = new Request.Builder()
                .url(Url.FCM_MESSAGE_URL)
                .post(body)
                .addHeader("Authorization", "key=" + "your server key")
                .build();
        Response response = mClient.newCall(request).execute();
        return response.body().string();
    }

Step 4 : Call in onclick of your button

    btnSend.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sendMessage(jsonArray,"Hello","How r u","Http:\\google.com","My Name is Vishal");
        }
    });