How to send upstream messages with FCM from android client?

Question

We were using GoogleCloudMessaging.getInstance(context).send(context.getString(R.string.gcm_defaultSenderId) + \"@gcm.googleapis.com\", mId, mBundle); to send upstr

Answer 1

Well, my answer comes fast. Keeping question and answer for future reference. I have found the answer on https://firebase.google.com/docs/cloud-messaging/android/upstream#sample-send

thanks to google's smart exclusion to search results In order to show you the most relevant results, we have omitted some entries very similar to the 2 already displayed. If you like, you can repeat the search with the omitted results included.

new API would be like:

FirebaseMessaging fm = FirebaseMessaging.getInstance();
fm.send(new RemoteMessage.Builder(SENDER_ID + "@gcm.googleapis.com")
  .setMessageId(Integer.toString(msgId.incrementAndGet()))
  .addData("my_message", "Hello World")
  .addData("my_action","SAY_HELLO")
  .build());

Answer 2

Well you can send your message directly to android devices from android application, here is the simple implementation I have done and it works great for me.

1. compile android volley library

   compile 'com.android.volley:volley:1.0.0'
   

2. Just copy paste this simple function ;) and your life will become smooth just like knife in butter. :D

   public static void sendPushToSingleInstance(final Context activity, final HashMap dataValue /*your data from the activity*/, final String instanceIdToken /*firebase instance token you will find in documentation that how to get this*/ ) {
   
   
   final String url = "https://fcm.googleapis.com/fcm/send";
   StringRequest myReq = new StringRequest(Request.Method.POST,url,
           new Response.Listener<String>() {
               @Override
               public void onResponse(String response) {
                   Toast.makeText(activity, "Bingo Success", Toast.LENGTH_SHORT).show();
               }
           },
           new Response.ErrorListener() {
               @Override
               public void onErrorResponse(VolleyError error) {
                   Toast.makeText(activity, "Oops error", Toast.LENGTH_SHORT).show();
               }
           }) {
   
       @Override
       public byte[] getBody() throws com.android.volley.AuthFailureError {
           Map<String,String> rawParameters = new Hashtable<String, String>();
           rawParameters.put("data", new JSONObject(dataValue).toString());
           rawParameters.put("to", instanceIdToken);
           return new JSONObject(rawParameters).toString().getBytes();
       };
   
       public String getBodyContentType()
       {
           return "application/json; charset=utf-8";
       }
       @Override
       public Map<String, String> getHeaders() throws AuthFailureError {
           HashMap<String, String> headers = new HashMap<String, String>();
           headers.put("Authorization", "key="+YOUR_LEGACY_SERVER_KEY_FROM_FIREBASE_CONSOLE);
           return headers;
       }
   
   };
   
   Volley.newRequestQueue(activity).add(myReq);
   }
   

Note If you want to send message to topics so you can change parameter instanceIdToken to something like /topics/topicName. For groups implementation is the same but you just need to take care of parameters. checkout Firebase documentation and you can pass those parameters. let me know if you face any issue.