Moves out-of-place Firebase InstanceId call to the google build flavor. Closes #274

app/src/fdroid/java/com/keylesspalace/tusky/MessagingService.java

@@ -134,4 +134,9 @@ public class MessagingService extends IntentService {
                 .putStringSet("current_ids", currentIds)
                 .apply();
     }
+
+    public static String getInstanceToken() {
+        // This is only used for the "google" build flavor, so this version is just a stub method.
+        return null;
+    }
 }

app/src/google/java/com/keylesspalace/tusky/MessagingService.java

@@ -25,6 +25,7 @@ import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import android.text.Spanned;
 
+import com.google.firebase.iid.FirebaseInstanceId;
 import com.google.firebase.messaging.FirebaseMessagingService;
 import com.google.firebase.messaging.RemoteMessage;
 import com.google.gson.Gson;
@@ -125,4 +126,8 @@ public class MessagingService extends FirebaseMessagingService {
 
         mastodonAPI = retrofit.create(MastodonAPI.class);
     }
+
+    public static String getInstanceToken() {
+        return FirebaseInstanceId.getInstance().getToken();
+    }
 }

app/src/main/java/com/keylesspalace/tusky/BaseActivity.java

@@ -204,7 +204,7 @@ public class BaseActivity extends AppCompatActivity {
 
     protected void enablePushNotifications() {
         if (BuildConfig.USES_PUSH_NOTIFICATIONS) {
-            String token = com.google.firebase.iid.FirebaseInstanceId.getInstance().getToken();
+            String token = MessagingService.getInstanceToken();
             tuskyAPI.register(getBaseUrl(), getAccessToken(), token).enqueue(new Callback<ResponseBody>() {
                 @Override
                 public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {