Android AsyncTask and NetworkOnMainThreadException

Question

我正在开发一个使用Jsoup的Android应用程序。在开发早期，我"绕过"必须实现任何类型的线程，因为我只想在处理线程之前完成大部分代码。我现在正试图使用AsyncTask，但我仍然得到NetworkOnMainThreadException错误。我读了很多关于AsyncTask的教程和SO帖子，但似乎仍然可以确定问题。当我添加StrictMode…除了在使用Jsoup加载数据时出现UI锁定外，应用程序可以正常工作。如果有人能告诉我我做错了什么有关AsyncTask，我会很感激。(P.S.我知道有很多代码冗余要清理，但我想让AsyncTask工作第一)

public void onCreate(Bundle savedInstanceState)  {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);  
            /***This is the work around used***/
            StrictMode.ThreadPolicy policy = new     StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
            /******/  

            up = new TreeMap<Double, String[]>(); 
            c1 = "example.com/1";
            //instansiate textviews (6)
                    doc1 = doc;
            c2 = "example.com/2";
            //instansiate textviews (6)
                    doc2 = doc;
            c3 = "example.com/3";
            //instansiate textviews (6)
            doc3 = doc;
            // instansiate textviews(16)
            new Download().execute(c1,c2,c3);
   } 
        private class Download extends AsyncTask<String, Integer, String[][]> {
            @Override
            protected String[][] doInBackground(String... urls){
                out = new String[7][3];
                try {
                    doc = Jsoup.connect(urls[0]).data().get();          
                    //days, times, and cs arrays created and filled
                    String[] out1arr = {days[0], times[0], cs[0]};
                    //...all 7
                    String[] out7arr = {days[6], times[6], cs[6]};
                    String[][] outarrs = {out1arr,out2arr,out3arr,out4arr,out5arr,out6arr,out7arr};
                    for (int i= 0; i < out.length; i++){
                        out[i] = outarrs[i];
                    }
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
                return (out);
            }
            @Override
            protected void onProgressUpdate(Integer... progress){
            }
            @Override
            protected void onPostExecute(String[][] result){
                Do(/*textviews(6)*/, c1, a, outa, "example1"); //a is previously instantiated double array, outa is preiously instantiated string array
                Do(/*textviews(6)*/, c2, b, outb, "example2");
                Do(/*textviews(6)*/, c3, c, outc, "example3");

                upc00.setText(getUpc()[0][0]);
                //setText for all 16
                upc32.setText(getUpc()[3][2]);
            }
            private void Do(TextView t, TextView u, TextView v, TextView w, TextView x, TextView y,String webpage, double[] darr, String[] sarr, String show){

                t.setText(doInBackground(webpage)[0][0]);
                //...all 6
                y.setText(doInBackground(webpage)[1][2]);       
                for (int i =0; i < darr.length; i++){
                    darr[i] = tis[i];
                    up.put(darr[i], out[i]);
                }
            }
        }
        private ArrayList<String[]> getMap(){
                //...
            return s;
        }
        private String[][] getUpc(){
            //...
            return upc;
        }

Answer 1

框架调用doInBackground，您不应该自己调用它。您的代码从onPostExecute调用，该调用由框架在UI线程上调用。所以实际上你的调用运行在UI线程上。

将抓取逻辑全部移动到doInBackgound方法中。应该使用onPostExecute方法将结果传递给调用者。