Android，Realm：PermissionOfferResponse onChange（）只调用一次

Question

启动Android应用时，我想：

• 登录Realm对象服务器
• 接收方创建PermissionOfferResponse
• 等待服务器同步和处理商品响应，这将填充响应对象的realmUrl属性。

这里代码：

public class MainApp extends MultiDexApplication {

 private void loginAndConfig() {

String authUrl = "http://" + BuildConfig.OBJECT_SERVER_IP + ":" + BuildConfig.OBJECT_SERVER_PORT + "/auth";
    SyncUser.Callback callback = new SyncUser.Callback() {
        @Override
        public void onSuccess(SyncUser user) {
            setPermissions(user);
        }


    SyncCredentials syncCredentials = SyncCredentials.usernamePassword(
            BuildConfig.USER_NAME, BuildConfig.PASSWORD, false);
    SyncUser.loginAsync(syncCredentials, authUrl, callback);
}

private void setPermissions(final SyncUser syncUser) {
    Realm managementRealm = syncUser.getManagementRealm();
    String offerToken = BuildConfig.REALM_OFFER_TOKEN;
    final PermissionOfferResponse permissionOfferResponse = new PermissionOfferResponse(offerToken);
    // Add to management Realm to sync with ROS
    managementRealm.executeTransactionAsync(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            realm.insert(permissionOfferResponse); 
        }
    });


    RealmResults<PermissionOfferResponse> realmResultPermissionOfferResponse = managementRealm.where(PermissionOfferResponse.class)
            //.equalTo("id", offerId)
            .equalTo("statusCode", 0) // status > 0 is error
            .findAll();

    realmResultPermissionOfferResponse.addChangeListener(new RealmChangeListener<RealmResults<PermissionOfferResponse>>()  {
        @Override
        public void onChange(RealmResults<PermissionOfferResponse> offers) { 
            // call only once
            PermissionOfferResponse offer = offers.first();
            String realmURL = offer.getRealmUrl();
        }
    });

}

当我第一次启动应用程序 onChange（）成功调用时，结果我从 PermissionOfferResponse 获取 realmURL 。行。

但是，当我再次启动app时，方法 onChange（） NOT CALL。结果我无法获得RealmURL。