@Nullable @Named in GAE/Android Sample

Question

我正在尝试使用示例GAE/Android应用程序.有实体.

在生成的PlaceEndpoint类中有一个方法:

@ApiMethod(name = "listGame")
    public CollectionResponse<Place> listPlace(
            @Nullable @Named("cursor") String cursorString,
            @Nullable @Named("limit") Integer limit) {

        EntityManager mgr = null;
        Cursor cursor = null;
        List<Game> execute = null;

        try {
            mgr = getEntityManager();
            Query query = mgr.createQuery("select from Place as Place");
            if (cursorString != null && cursorString != "") {
                cursor = Cursor.fromWebSafeString(cursorString);
                query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
            }

            if (limit != null) {
                query.setFirstResult(0);
                query.setMaxResults(limit);
            }

            execute = (List<Game>) query.getResultList();
            cursor = JPACursorHelper.getCursor(execute);
            if (cursor != null)
                cursorString = cursor.toWebSafeString();

            // Tight loop for fetching all entities from datastore and accomodate
            // for lazy fetch.
            for (Game obj : execute)
                ;
        } finally {
            mgr.close();
        }

        return CollectionResponse.<Game> builder().setItems(execute)
                .setNextPageToken(cursorString).build();
    }

据我了解cursor和limit所有可选的参数.

但是,我无法弄清楚如何Placeednpoint在客户端使用类传递它们:

Placeendpoint.Builder builder = new Placeendpoint.Builder(AndroidHttp.newCompatibleTransport(), new JacksonFactory(), null);
builder = CloudEndpointUtils.updateBuilder(builder);
Placeendpoint endpoint = builder.build();

try {
    CollectionResponsePlace placesResponse = endpoint.listPlace().execute();
} catch (Exception e) {
    e.printStackTrace();

通常,当params不可为空时,我会在endpoint.listPlace()方法中传递它们.但是当params可以为空时,客户端应用程序看不到替代构造函数,那将接受params.

那我该怎么办呢？

Answer 1

要在通过云端点发送查询请求时从客户端传递参数,您需要添加用于设置参数的设置.要从android发送所需的参数,您将定义REST路径和方法类型的类应包括设置游标和限制的选项.例如,对于String cursorstring:

@com.google.api.client.util.Key
      private String cursorstring;

      public String getCursorstring() {
        return cursorstring;
      }

      public ListPlace setCursorstring(String cursorstring) {
        this.cursorstring = cursorstring;
        return this;
      }

最后,当你从android代码调用端点方法时,你应该使用setCursorstring传递一个值,它将类似于:

CollectionResponsePlace placesResponse = endpoint.listPlace().setCursorstring("yourcursorstring").execute();