How to hit Firebase HTTP protocol with Retrofit? - firebase-cloud-messaging

Question

I want o post data on https://fcm.googleapis.com/fcm/send
along with two headers in Retrofit
Data to be sent
{
"data" : {
"title": "My Title",
"content": "My message"
},
"to": "cKA7LrjBQ6s:APA91bHtY6RBwZ4KZvxbl9VNZMVKz5_NDbE2dP3zgrhJNBSAKDyfOAbfxEi8pnAwc82pzLoGEZImZBv9MXvoBSJy6c0790oqUIYLECCU5WZVcGeSJJNECX5bsLMutYrSPjLSDffP5N3u"
}

Answer 1

It's very simple. Create the following classes.
public interface RestInterface {
#Headers({
"Content-Type: application/json",
"Authorization: key=<YOUR_FCM_SERVER_KEY_HERE>"
})
#POST("fcm/send")
Call<ResponseBody> sendNotification(#Body NotificationBody body);
}
Replace <YOUR_FCM_SERVER_KEY_HERE> with your actual FCM server key.
public class NotificationBody {
#SerializedName("data")
private Data data;
#SerializedName("to")
private String to;
public NotificationBody(Data data, String to) {
this.data = data;
this.to = to;
}
}
Above POJO class will generate outer JSONObject in run-time. And the following POJO class will generate data JSONObject.
public class Data {
#SerializedName("title")
private String title;
#SerializedName("content")
private String content;
public Data(String title, String content) {
this.title = title;
this.content = content;
}
}
And finally use above code in your Activity/Fragment classes like below,
String title = "My Title";
String content = "My message";
String to = "cKA7LrjBQ6s:APA91bHtY6RBwZ4KZvxbl9VNZMVKz5_NDbE2dP3zgrhJNBSAKDyfOAbfxEi8pnAwc82pzLoGEZImZBv9MXvoBSJy6c0790oqUIYLECCU5WZVcGeSJJNECX5bsLMutYrSPjLSDffP5N3u";
Data data = new Data(title, content);
NotificationBody body = new NotificationBody(data, to);
RestInterface api = ....;
Call<ResponseBody> call = api.sendNotification(body);
call.enqueue(new Callback<ResponseBody>() {
#Override
public void onResponse(Call<ResponseBody> call, final Response<ResponseBody> response) {
// do whatever you want to do
}
#Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Log.e("TAG", "Error: ", t);
}
});
And don't forget to set Retrofit BASE_URL to https://fcm.googleapis.com/