Issue
I just need to send a push notification to a specific users inside my Button OnClickListener. Is it possible with userId and all information of this specific user?
this is my Button OnClickListener() code
richiedi_invito.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
databaseReference = FirebaseDatabase.getInstance().getReference();
databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
lista_richieste = (ArrayList) dataSnapshot.child("classi").child(nome).child("lista_richieste").getValue();
verifica_richieste = (String) dataSnapshot.child("classi").child(nome).child("richieste").getValue();
if (!lista_richieste.contains(userID)){
ArrayList lista_invito = new ArrayList();
lista_invito.add(userID);
if (verifica_richieste.equals("null")){
databaseReference.child("classi").child(nome).child("richieste").setValue("not_null");
databaseReference.child("classi").child(nome).child("lista_richieste").setValue(lista_invito);
}
else{
lista_richieste.add(userID);
databaseReference.child("classi").child(nome).child("lista_richieste").setValue(lista_richieste);
}
//invitation code here
Fragment frag_crea_unisciti = new CreaUniscitiFrag();
FragmentManager fragmentManager= getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, frag_crea_unisciti);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
Toast.makeText(getActivity(), "Richiesta di entrare inviata correttamente", Toast.LENGTH_SHORT).show();
}else{
Snackbar.make(layout,"Hai già richiesto di entrare in questa classe",Snackbar.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
Solution
First, the user has to generate
String token = FirebaseInstanceId.getInstance().getToken();
and then store it in Firebase database with userId as key or you can subscribe the user to any topic by FirebaseMessaging.getInstance().subscribeToTopic("topic");
To send the notification you have to hit this API: https://fcm.googleapis.com/fcm/send
With headers "Authorization" your FCM key and Content-Type as "application/json" the request body should be:
{
"to": "/topics or FCM id",
"priority": "high",
"notification": {
"title": "Your Title",
"text": "Your Text"
},
"data": {
"customId": "02",
"badge": 1,
"sound": "",
"alert": "Alert"
}
}
Or you can use okHttp which is not recommended method because your FCM key will be exposed and can be misused.
public class FcmNotifier {
public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
public static void sendNotification(final String body, final String title) {
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
try {
OkHttpClient client = new OkHttpClient();
JSONObject json = new JSONObject();
JSONObject notifJson = new JSONObject();
JSONObject dataJson = new JSONObject();
notifJson.put("text", body);
notifJson.put("title", title);
notifJson.put("priority", "high");
dataJson.put("customId", "02");
dataJson.put("badge", 1);
dataJson.put("alert", "Alert");
json.put("notification", notifJson);
json.put("data", dataJson);
json.put("to", "/topics/topic");
RequestBody body = RequestBody.create(JSON, json.toString());
Request request = new Request.Builder()
.header("Authorization", "key=your FCM key")
.url("https://fcm.googleapis.com/fcm/send")
.post(body)
.build();
Response response = client.newCall(request).execute();
String finalResponse = response.body().string();
Log.i("kunwar", finalResponse);
} catch (Exception e) {
Log.i("kunwar",e.getMessage());
}
return null;
}
}.execute();
}
}
NOTE: THIS SOLUTION IS NOT RECOMMENDED BECAUSE IT EXPOSES FIREBASE API KEY TO THE PUBLIC
Answered By - kunwar97
Answer Checked By - Pedro (JavaFixing Volunteer)
