java - 异步任务中的多个操作 (Android)

Question

异步任务中是否可以有多个httpclient？在我下面的代码中..它检索用户的信息，然后将其显示到一个新 Activity 中..但是我还想在执行 ProfileAsync 时获取关注者的数量和用户的关注者..我有单独的 php 文件检索用户信息以及关注者和关注者的数量..

class ProfileAsync extends AsyncTask<String, String, String>{

                private Dialog loadingDialog;

                @Override
                protected void onPreExecute() {
                    super.onPreExecute();
                    loadingDialog = ProgressDialog.show(HomePageActivity.this, "Please wait", "Loading...");
                }

                @Override
                protected String doInBackground(String... params) {
                    String json=null;
                    String json2=null;
                    byte[] data;
                    StringBuffer buffer = null;
                    InputStream is = null;



                    try{
                        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                        nameValuePairs.add(new BasicNameValuePair("Username", uname));

                        HttpClient httpClient = new DefaultHttpClient();
                        HttpPost httpPost = new HttpPost(PROFILE_URL);
                        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                        HttpResponse response = httpClient.execute(httpPost);

                        HttpEntity entity = response.getEntity();
                        json = EntityUtils.toString(entity);
                        Log.e("Profile JSON: ", json.toString());

                    } catch (ClientProtocolException e) {
                        e.printStackTrace();
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } 
                    return json;
                }

                @Override
                protected void onPostExecute(String json){
                    super.onPostExecute(json);

                    loadingDialog.dismiss();

                    try
                    {
                    jsonobject = new JSONObject(json);
                    jsonarray = jsonobject.getJSONArray("user");
                    JSONObject jb= jsonarray.getJSONObject(0);
                    //Username = jb.getString("Username");
                    Password = jb.getString("Password");
                    Fullname = jb.getString("Fullname");
                    Email = jb.getString("Email");
                    Bio = jb.getString("Bio");
                    Location = jb.getString("Location");



                    fn.setText(Fullname);
                    em.setText(Email);
                    loc.setText(Location);
                    b.setText(Bio);

                    if(json!=null)
                    {
                        Intent i = new Intent(HomePageActivity.this,ProfileActivity.class);
                        i.putExtra(u.username(), u.getUsername());
                        i.putExtra("password",Password);
                        i.putExtra("fullname",Fullname);
                        i.putExtra("email", Email);
                        i.putExtra("bio", Bio);
                        i.putExtra("location", Location);
                        startActivity(i);
                        finish();
                    }



                    }catch(Exception e)
                    {
                        e.printStackTrace();
                    }



                }
            }//end of profileasynctask

Answer 1

是的，您可以发送多个网址作为参数，所有网址都将作为参数数组提供，如 params[0]、params[1]，您可以循环它来发送多个请求，但我建议不要在单个 AyncTask 因为它会花费大量时间，并且如 Android 开发人员指南中所述，AsyncTask 应该用于需要工作线程的短操作，您可以在此处阅读 - https://developer.android.com/reference/android/os/AsyncTask.html

如果您想发送多个请求，请尝试使用著名的网络库(例如 Retrofit)，或者如果您想使用 AsynTask，请为每个请求编写一个单独的任务。