OKHttp工具类

public class HttpUtils {
private static final HttpUtils ourInstance = new HttpUtils();
private final OkHttpClient client;
private static volatile HttpUtils instance;
private Handler handler = new Handler();
public static HttpUtils getInstance() {
if (instance == null){
synchronized (HttpUtils.class){
if (null == instance){
instance = new HttpUtils();
}
}
}
return instance;
}

private HttpUtils() {
    client = new OkHttpClient();
}
public void get(String url, final ICallBack iCallBack, final Type type){
    Request request = new Request
            .Builder()
            .get()
            .url(url)
            .build();
    Call call = client.newCall(request);
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, final IOException e) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    iCallBack.failed(e);
                }
            });
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            String result = response.body().string();
            Gson gson = new Gson();
            final Object o = gson.fromJson(result, type);
            handler.post(new Runnable() {
                @Override
                public void run() {
                    iCallBack.onsucces(o);
                }
            });
        }
    });
}

}
重建一个接口类
public interface ICallBack {

void onsucces(Object object);

void failed(Exception e);

}