java - 如何在 onPerformSync 中实现 Yelp Api

Question

你们能不能帮我一下。我一直在尝试在 onPerformSyn 中运行 yelp api。我怎么可能这样做。？我收到以下错误。 “没有空的构造函数”我正在使用这个 post尝试创建构造函数，但它对我不起作用。
请帮助表示赞赏。

注意:在 Yelp 响应之后，我会将数据存储到 SQLite(方案库)中，这样代码就不会结束。

public class SyncAdapter extends AbstractThreadedSyncAdapter{
    public final String LOG_TAG = SyncAdapter.class.getSimpleName();
    public static final int SYNC_INTERVAL = 4;//60 * 180;
    public static final int SYNC_FLEXTIME = SYNC_INTERVAL/3;
    private static final long DAY_IN_MILLIS = 1000;//1000 * 60 * 60 * 24;
    private static final int WEATHER_NOTIFICATION_ID = 3004;

    private GoogleApiClient mGoogleApiClient;
    private YelpAPI yelpAPI;
    private Location mLastLocation;

    public SyncAdapter(Context context, boolean autoInitialize) {
        super(context, autoInitialize);

//        YelpAPIFactory apiFactory = new YelpAPIFactory(BuildConfig.YELP_CONSUMER_KEY, BuildConfig.YELP_CONSUMER_SECRET, BuildConfig.YELP_TOKEN, BuildConfig.YELP_TOKEN_SECRET);
//        yelpAPI = apiFactory.createAPI();
    }


    @Override
    public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {


        class YelpApi2 extends DefaultApi10a {

            @Override
            public String getAccessTokenEndpoint() {
                return null;
            }

            @Override
            public String getAuthorizationUrl(Token arg0) {
                return null;
            }

            @Override
            public String getRequestTokenEndpoint() {
                return null;
            }

        }

        class Yelp {
            OAuthService service;
            Token accessToken;
            public Yelp(String consumerKey, String consumerSecret,     String token, String tokenSecret) {
                this.service = new    ServiceBuilder().provider(YelpApi2.class).apiKey(consumerKey).apiSecret(consumerSecret).build();
                this.accessToken = new Token(token, tokenSecret);
            }

            public String search(String term, double latitude, double longitude) {
                OAuthRequest request = new OAuthRequest(Verb.GET, "http://api.yelp.com/v2/search");
                request.addQuerystringParameter("term", term);
                request.addQuerystringParameter("ll", latitude + "," + longitude);
                this.service.signRequest(this.accessToken, request);
                Response response = request.send();
                return response.getBody();
            }

        }



            Yelp yelp = new Yelp(BuildConfig.YELP_CONSUMER_KEY, BuildConfig.YELP_CONSUMER_SECRET, BuildConfig.YELP_TOKEN, BuildConfig.YELP_TOKEN_SECRET);
            String response = yelp.search("church", 30.361471, -87.164326);

            System.out.println(response);
            }

我关注了这个tut ,但我没有做 .jar 部分，我无法导入它，而是在 gradle 中使用了这一行。

        compile 'com.yelp.clientlib:yelp-android:2.0.0'

Error I'm getting
=========================================

    FATAL EXCEPTION: SyncAdapterThread-1
    Process: mem.edu.joshua, PID: 14149
    org.scribe.exceptions.OAuthException: Error while creating the Api object
    at org.scribe.builder.ServiceBuilder.createApi(ServiceBuilder.java:59)
    at org.scribe.builder.ServiceBuilder.provider(ServiceBuilder.java:45)
    at mem.edu.joshua.sync.SyncAdapter$1Yelp.<init>(SyncAdapter.java:99)
    at mem.edu.joshua.sync.SyncAdapter.onPerformSync(SyncAdapter.java:116)
    at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)

    Caused by: java.lang.InstantiationException: can't instantiate class mem.edu.joshua.sync.SyncAdapter$1YelpApi2; no empty constructor
    at java.lang.Class.newInstanceImpl(Native Method)
    at java.lang.Class.newInstance(Class.java:1208)


  [1]: http://stackoverflow.com/questions/11859403/no-empty-constructor-when-create-a-service
  [2]: https://thysmichels.com/2011/12/30/yelp-api-example/#comment-18031

Answer 1

问题在于 ServiceBuilder 试图通过反射来实例化类。这会在使用本地类或内部类时引起问题，因为这些类需要额外的“不可见”参数。 (相关问题:How to instantiate inner class with reflection in Java?)

所以解决方案是将 Yelp 类和 YelpApi2 类提取到它们自己的文件中。