How to send device to device messages using Firebase Cloud Messaging?

Question

After searching the docs I could not find any info on how to send device to device messages using FCM without the use of an external server.

For example, if I was cr

Answer 1

You can do it using Volly Jsonobject request....

follow this Steps first:

1 copy legacy server key and store it as Legacy_SERVER_KEY

Legacy Server key

you can see in picture how to get

2 You need Volley dependency

compile 'com.mcxiaoke.volley:library:1.0.19'

Code for send Push:-

private void sendFCMPush() {

    String Legacy_SERVER_KEY = YOUR_Legacy_SERVER_KEY;
    String msg = "this is test message,.,,.,.";
    String title = "my title";
    String token = FCM_RECEIVER_TOKEN;

    JSONObject obj = null;
    JSONObject objData = null;
    JSONObject dataobjData = null;

    try {
        obj = new JSONObject();
        objData = new JSONObject();

        objData.put("body", msg);
        objData.put("title", title);
        objData.put("sound", "default");
        objData.put("icon", "icon_name"); //   icon_name image must be there in drawable
        objData.put("tag", token);
        objData.put("priority", "high");

        dataobjData = new JSONObject();
        dataobjData.put("text", msg);
        dataobjData.put("title", title);

        obj.put("to", token);
        //obj.put("priority", "high");

        obj.put("notification", objData);
        obj.put("data", dataobjData);
        Log.e("!_@rj@_@@_PASS:>", obj.toString());
    } catch (JSONException e) {
        e.printStackTrace();
    }

    JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.POST, Constants.FCM_PUSH_URL, obj,
            new Response.Listener() {
                @Override
                public void onResponse(JSONObject response) {
                    Log.e("!_@@_SUCESS", response + "");
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.e("!_@@_Errors--", error + "");
                }
            }) {
        @Override
        public Map getHeaders() throws AuthFailureError {
            Map params = new HashMap();
            params.put("Authorization", "key=" + Legacy_SERVER_KEY);
            params.put("Content-Type", "application/json");
            return params;
        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    int socketTimeout = 1000 * 60;// 60 seconds
    RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
    jsObjRequest.setRetryPolicy(policy);
    requestQueue.add(jsObjRequest);
}

Just Call sendFCMPush();