How one interface can be used for different background android tasks?

This is the interface for callback

public interface CallbackReceiver {
    public void receiveData(Object result);

}

Use Asynctask class as Abstract class

public abstract class JsonDataCallback extends AsyncTask<String, String, String> implements CallbackReceiver {
private ProgressDialog mProgressDialog;
Handler handler;
Runnable callback;
Activity activity;


public JsonDataCallback(Activity activity) 
{
     this.activity=activity;
     mProgressDialog = new ProgressDialog(activity);
     mProgressDialog.setMessage("Loading Please Wait.");
     mProgressDialog.setIndeterminate(false);
     mProgressDialog.setMax(100);
     mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
     mProgressDialog.setCancelable(true);
}

public abstract void receiveData(Object object);
@Override
protected void onPreExecute() {
    mProgressDialog =ProgressDialog.show(activity, "", "Please Wait",true,false);
    super.onPreExecute();
}

@Override
protected String doInBackground(String... aurl) {
    String results="";
    // do stuff
    return results;
}


@Override
protected void onPostExecute(String jsonData) {
     if (mProgressDialog != null || mProgressDialog.isShowing()){
         mProgressDialog.dismiss();
 }
     if(jsonData!=null)
     {
         receiveData(jsonData);
     }
}
}

And in your code use it like this

String url = ipaddress + "/GrantAdvanceList;
            JsonDataCallback callbackservice = new JsonDataCallback(yourActivity.this) {
                @Override
                public void receiveData(Object object) {
                    jsonRecordsData = (String)object;
                    //do stuff with call back data
                }
            };

        callbackservice.execute(url, null, null);

You can reuse the code this way.