正确的方法将Java AsyncTask子类化为更松散的耦合

Question

对AsyncTask进行子类化以使其可以在多个活动中重用的正确方法是什么？

我有多个活动都使用相同的AsyncTask来获取一些JSON数据。唯一的区别是每个Activity都有自己的ProgressBar来显示activty和它自己的 processResult 来处理返回的JSON数据。我想继承AsyncTask，以便我可以传递对ProgressBar的引用，以便设置相应的Activity的ProgressBar可见性，并将返回的数据传递给该Activity＆ ＃39; s processResults（）。

以下是典型活动的摘要：

public class MyActivity extends AppCompatActivity {

    private ProgressBar mProgessBar;
    private List<Object> myList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mylayout);


        mProgessBar = (ProgressBar) findViewById(R.id.myProgessBar);
        myList = new ArrayList<Object>();

        getData();

    }

    private void getData() {
        //All async tasks take string variables
            new BGGetData().execute("Something", "Something", "Dark side", null);
    }

    private void processResults(JSONObject data) {
    //Different types of data for different activities.
        //process JSON results to fill myList or do something other action with the data
    }


    ///////
    //BACKGROUND TASK IS REPEATED IN MULTIPLE ACTIVITIES
    ///////
    public class BGGetData extends AsyncTask<String, Void, JSONObject> {

        @Override
        protected void onPreExecute() {
            mProgressBar.setVisibility(View.VISIBLE);

        }

        @Override
        protected JSONObject doInBackground(String... params) {

            // do something to get a jsonobject

            return json; 
        }

        @Override
        protected void onPostExecute(JSONObject data) {
            mProgressBar.setVisibility(View.GONE);
            processResults(data);
        }

    }

}