Firebase Invites -

MainActivity.java

// Check for App Invite invitations and launch deep-link activity if possible.
// Requires that an Activity is registered in AndroidManifest.xml to handle
// deep-link URLs.
FirebaseDynamicLinks.getInstance().getDynamicLink(getIntent())
        .addOnSuccessListener(this, new OnSuccessListener<PendingDynamicLinkData>() {
            @Override
            public void onSuccess(PendingDynamicLinkData data) {
                if (data == null) {
                    Log.d(TAG, "getInvitation: no data");
                    return;
                }

                // Extract invite
                FirebaseAppInvite invite = FirebaseAppInvite.getInvitation(data);
                if (invite != null) {
                    String invitationId = invite.getInvitationId();
                    Log.d(TAG, "invitationId:" + invitationId);
                }

                // Get and handle the deep link
                Uri deepLink = data.getLink();
                if (deepLink != null) {
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setPackage(getPackageName());
                    intent.setData(deepLink);
                    startActivity(intent);
                }
            }
        })
        .addOnFailureListener(this, new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w(TAG, "getDynamicLink:onFailure", e);
            }
        });