I follow the tutorial in https://learn.microsoft.com/en-us/xamarin/android/data-cloud/google-messaging/remote-notifications-with-fcm?tabs=vswin and manage to make server to client notification.
I find a few tutorials and example in java but i need to make it in Xamarin android platform.
I need to make application that send notification from one phone to one phone which is client to client and still using FCM, anyone have idea or example code that i can dig in?
First, please follow this step by step to complete it, then you will get the base application.
Second, add a button to send Http to the FCM server:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text=" "
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/msgText"
android:textAppearance="?android:attr/textAppearanceMedium"
android:padding="10dp" />
<Button
android:id="@+id/bt"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
initialize the button in OnCreate:
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
msgText = FindViewById<TextView>(Resource.Id.msgText);
IsPlayServicesAvailable();
Button bt = FindViewById<Button>(Resource.Id.bt);
bt.Click += Bt_Click;
}
Here I used two class to generate the json string, and I am using json.net:
class Mes
{
public string to;
public Noti notification;
public Mes(string to,Noti notification){
this.to = to;
this.notification = notification;
}
}
class Noti {
public string title;
public string text;
public Noti(string body,string text) {
this.title = body;
this.text = body;
}
}
Click event(I am using okhttp3):
private void Bt_Click(object sender, System.EventArgs e)
{
Mes mes = new Mes("your token",
new Noti("great","yes"));
string json = JsonConvert.SerializeObject(mes);
Log.Error("json",json);
OkHttpClient client = new OkHttpClient();
RequestBody body = RequestBody.Create(
MediaType.Parse("application/json; charset=utf-8"),json);
Request request = new Request.Builder()
.Url("https://fcm.googleapis.com/fcm/send")// this is the base url which you can find it from https://firebase.google.com/docs/cloud-messaging/http-server-ref?#params
.Post(body)
.AddHeader("Authorization", "your app key")// find it from this case https://stackoverflow.com/questions/37337512/where-can-i-find-the-api-key-for-firebase-cloud-messaging
.Build();
// Synchronous blocking call
client.NewCall(request).Enqueue(
(call, response) => {
// Response came back
string body1 = response.Body().String();
Log.Error("lv",body1);
}, (call, exception) => {
// There was an error
Log.Error("lv", exception.Message);
});
}
After clicking the button, you will get a notification(if you have done with the first link), also, you don't need send a notification, you can use the data to do other things.
Change your MyFirebaseIIDService to this:
public class MyFirebaseIIDService : FirebaseInstanceIdService
{
const string TAG = "MyFirebaseIIDService";
public static string token;
public override void OnTokenRefresh()
{
token = FirebaseInstanceId.Instance.Token;
Log.Debug(TAG, "Refreshed token: " + token);
SendRegistrationToServer(token);
}
void SendRegistrationToServer(string token)
{
// Add custom implementation, as needed.
}
}
And then use this:
Mes mes = new Mes(MyFirebaseIIDService.token,new Noti("great","yes"));
Request request = new Request.Builder()
.Url("https://fcm.googleapis.com/fcm/send")
.Post(body)
.AddHeader("Authorization", "key=AAAAjPn9-TY:APA91bE-g4774KmFI72V1gWATmK8uta7N7NgcufoEgGgdidU9wyWBQ5YagCjP0WPBKrgILHZSVeb1I9vegYC-YfFHE2umWWcTzjo-t7W8ynDkwbB6qHY7JZExaxxvlI3VIg3d66sFZ40")
.Build();
This is my http request, note that AddHeader method, you need use key=....
