Прежде всего вы получаете devicetoken из firebase, а затем отправляете уведомление из приложения, используя следующий код.
public class UtilsFcm {
static OkHttpClient mClient;
static Context context;
static JSONArray jsonArray;
public static void sendNotification(final Context context1, final JSONArray jsonArray1) {
mClient = new OkHttpClient();
context = context1;
jsonArray = jsonArray1;
new MyTask().execute();
}
static class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
try {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject root = new JSONObject();
JSONObject notification = new JSONObject();
notification.put("text", "Your notification message");
notification.put("title", "App Title");
notification.put("line1", R.mipmap.ic_launcher);
notification.put("line2", "high");
root.put("to", jsonArray.get(i));
root.put("data", notification);
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) {
if (result != null) {
try {
JSONObject resultJson = new JSONObject(result);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(context, "" + e.toString(), Toast.LENGTH_SHORT).show();
}
}
}
}
static String postToFCM(String bodyString) throws IOException {
final String FCM_MESSAGE_URL = "https://fcm.googleapis.com/fcm/send";
final MediaType JSON
= MediaType.parse("application/json");
RequestBody body = RequestBody.create(JSON, bodyString);
Request request = new Request.Builder()
.url(FCM_MESSAGE_URL)
.post(body)
.addHeader("Authorization", "key=" + "firebase_web_api_key")
.build();
Response response = mClient.newCall(request).execute();
return response.body().string();
}
}
and then you call this method like this.
UtilsFcm.sendNotification(this,jsonArray);
here jsonarray have all device token.
hope this will help you.