Question

我正在尝试编写一个常见的Web服务类，其中我的应用程序中的任何活动都必须指向Web服务的这个公共类。目前我陷入了困境之中;将成功/失败消息传递给调用类，我目前的实施如下，我有一个接口类，我有2个方法，

 public void webServiceReqExecutedSuccessfully();
 public void webSerReqFailed();

并且每个webservice调用类都根据其要求实现这些方法。我的常见Web服务类如下所示，

    public class WebServiceRequest extends AsyncTask < String, Void, Boolean> 
    {             
        private static final MediaType FORM_DATA_TYPE = MediaType.parse("application/x-www-form-urlencoded; charset=utf-8");                          public enum HTTPServiceTags {             
          POST_IT,
          GET_ALL_ITEMS
         }

         HTTPServiceTags requestTag;
         public ATWebServiceRequest(HTTPServiceTags reqTag, Callable < Void > _ServiceResponseSuccess, Callable < Void > _ServiceResponseFailure) {
          this.requestTag = reqTag;
         }

         @Override
         protected Boolean doInBackground(String...postDataSet) {
          Boolean result = true;
          String requestURL = postDataSet[0];
          String postBody = getPostBody(postDataSet);
          Log.d(requestURL, postBody);
          try {
           OkHttpClient client = new OkHttpClient();
           RequestBody body = RequestBody.create(FORM_DATA_TYPE, postBody);
           Request request = new Request.Builder().url(requestURL).post(body).build();
           Response response = client.newCall(request).execute();
          } catch (IOException exception) {
           result = false;
          }
          return result;
         }

         @Override
         protected void onPostExecute(Boolean result) {
          if (result) {
           switch (requestTag) {
            case POST_IT:
//HOW CAN I NOTIFY/INVOKE webServiceReqExecutedSuccessfully METHOD OF THE CALLING CLASS HERE??? 
             break;
            case GET_ALL_ITEMS:
             break;
            default:
             break;
           }
          }
         }
        }

我的问题是在服务调用响应后如何通知/调用调用类接口方法（webServiceReqExecutedSuccessfully（）/ webSerReqFailed（））从哪个对象引用？任何帮助都提前感谢。感谢

Answer 1

创建将用作回调的Interface。

public interface MyCallBack {
    void onResult(HTTPServiceTags requestTag);
}

在Activity实现该界面 -

public class Xyz extends Activity implements MyCallBack {

  @override
  public void void onResult(HTTPServiceTags requestTag) {
  // Do your work
  }
}

在AsyncTask的构造函数中传递该接口 -

public WebServiceRequest(MyCallBack callBack) {
   this.mCallBack = callBack; // Assign it to global variable
}

然后在onPostExecute中调用它 -

@Override
 protected void onPostExecute(Boolean result) {
   if (result) {
   mCallBack.onResult(requestTag);
  }
}

如何在Android应用程序中为webservice调用创建一个通用的AsyncTask类？

1 个答案: