如何编写可重用的类来发出 http 异步请求？

Question

我有一个项目，我想编写一些使用 Internet 服务从MySQL服务器获取数据的函数。这些函数位于一些非活动类中。我打算从不同的活动中调用这些函数。我AsyncTask用来发出HTTP请求。以下是我设计的骨架。

public class MyLibrary{

    String myData;

    protected String getMyData(String param){

        HashMap<String, String> params = new HashMap<>();

        params.put("param1", apicall);

        params.put("param2", param);

        MyAsyncClass myAsyncClass = new MyAsyncClass(params);

        myAsyncClass.execute();

        /* Here after finishing the task I want to return the data to the caller */

        return myData;

    }

    private class MyAsyncClass extends AsyncTask<String, Integer, String> {

        MyAsyncClass(HashMap<String, String> params) {

            this.postData = params;

        }

        @Override

        protected void onPreExecute() {

            super.onPreExecute();

        }

        @Override

        protected String doInBackground(String... params) {

            RequestHandler requestHandler = new RequestHandler();

            return requestHandler.sendPostRequest(GlobalConstants.myurl, postData);

        }

        @Override

        protected void onPostExecute(String result) {

            super.onPostExecute(result);

            /* parse code here ... */

        }

    }

}

我的活动将访问该课程，如下所示。

public class SampleActivity extends AppCompatActivity{ 

    String returnedData;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        MyLibrary myLibraryObject = new MyLibrary();

        returnedData = myLibraryObject.getMyData("cih");

        /* do something with returnedData */

    }      

}

任何建议都会对我有很大帮助。由于我是新手，这可能是一个愚蠢的问题，但我的概念是重用代码。

Answer 1

如果您打算采用这种异步方式，那么您应该使用接口作为回调，或者您可以通过调用 AsyncTask 中的 get 方法来获取结果protected String getMyData(String param){&nbsp; &nbsp; &nbsp; &nbsp; HashMap<String, String> params = new HashMap<>();&nbsp; &nbsp; &nbsp; &nbsp; params.put("param1", apicall);&nbsp; &nbsp; &nbsp; &nbsp; params.put("param2", param);&nbsp; &nbsp; &nbsp; &nbsp; MyAsyncClass myAsyncClass = new MyAsyncClass(params);&nbsp; &nbsp; &nbsp; &nbsp;myData= myAsyncClass.execute().get();&nbsp; &nbsp; &nbsp; &nbsp; /* Here after finishing the task I want to return the data to the caller */&nbsp; &nbsp; &nbsp; &nbsp; return myData;&nbsp; &nbsp; }

Answer 2

我认为改装可能会解决您的问题。你可以搜索retrofit interceptor