java - 无法从服务器获取 JSON 数据

Question

无法从服务器获取数据 即使根据我在 onCreate() 中的条件我在 textview 中有值，当我删除此条件时这工作对我来说很好(我的意思是，在那种情况下我能够从服务器获取JSON数据)。

我尝试了很多东西，但对我来说仍然没有成功，总是得到 “无法从服务器获取数据”，因为我在 onPostExecute() 方法中将其用作 Toast异步任务

我正在为 TextView 获取 value，这肯定也是调用 AsyncTask 的 execute 方法，但总是无法从服务器获取数据

你有没有想过的问题:

1) 为什么我在 onCreate() 中使用这样的条件，然后检查我的 question

2) 为什么我要在 onPostExecute() 中设置适配器，然后检查我的 question

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_video_category);       

        etTextToSave = (TextView) findViewById(R.id.textView2);

        sharedprefs = getSharedPreferences("MyPrefs", MODE_PRIVATE);
        etTextToSave.setText(sharedprefs.getString("SharedPrefsData",""));      

        actorsList = new ArrayList<VideoCategory>(); 

        if(etTextToSave.getText().toString().length()>0)
        {               
            new JSONAsyncTask().execute("http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors");            
        }               
        centerLockHorizontalScrollview = (HSVActivity) findViewById(R.id.scrollView);

    }

    class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {

            ProgressDialog dialog;

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                dialog = new ProgressDialog(MainActivity.this);
                dialog.setMessage("Loading, please wait");
                dialog.setTitle("Connecting server");
                dialog.show();
                dialog.setCancelable(false);
            }

            @Override
            protected Boolean doInBackground(String... urls) {
                try {

                    //------------------>>
                    HttpGet httppost = new HttpGet(urls[0]);
                    HttpClient httpclient = new DefaultHttpClient();
                    HttpResponse response = httpclient.execute(httppost);

                    // StatusLine stat = response.getStatusLine();
                    int status = response.getStatusLine().getStatusCode();

                    if (status == 200) {
                        HttpEntity entity = response.getEntity();
                        String data = EntityUtils.toString(entity);


                        JSONObject jsono = new JSONObject(data);
                        JSONArray jarray = jsono.getJSONArray("actors");

                        for (int i = 0; i < jarray.length(); i++) {
                            JSONObject object = jarray.getJSONObject(i);

                            Actors actor = new Actors();

                            actor.setName(object.getString("name"));
                            Log.d("Name:", object.getString("name"));
                            actor.setImage(object.getString("image"));
                            Log.d("Image:", object.getString("image"));

                            actorsList.add(actor);
                        }
                        return true;
                    }

                    //------------------>>

                } catch (ParseException e1) {
                    e1.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                return false;
            }

            protected void onPostExecute(Boolean result) {
                dialog.cancel();                 
                if(result == false)
                    Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
                if(actorsList != null) {
                    adapter = new VideoCategoryAdapter(getApplicationContext(), R.layout.adapter_video_category, actorsList);      
                    centerLockHorizontalScrollview.setAdapter(HomeActivity.this, adapter);
                }
            }
        }

Answer 1

我没有收到任何异常或 toast 消息。检查 Json 响应。