The application is downloaded when the code is implemented

[Alberto]

Пишу простейшее приложения на Андройд. Получаю весь HTML сайта и вывожу данный текст на экран смартфона. Происходить всё это в Android Studio. Создал проект с помощью шаблона "Fragment + ViewModel". В MainActiviti с помощью метода getContent подключаюсь к сайту и считываю его HTML.
Метод работает, но как только я пытаюсь сделать передачу текста на экран, приложение при запуске тут же сворачивается. Подскажите что не так. Если убрать вот эту строчку

    text_poster = findViewById(R.id.text_poster);
        try {
            text_poster.setText(getContent(URL_POSTER));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

То приложение запускается и HTML можно вывести в Log(проверял но в коде этого нет). 


    public class MainActivity extends AppCompatActivity {
    private EditText text_poster;
    final public String URL_POSTER = "https://udmfil.ru/";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container, MainFragment.newInstance())
                    .commitNow();
        }
        text_poster = findViewById(R.id.text_poster);
        try {
            text_poster.setText(getContent(URL_POSTER));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public String getContent(String path) throws IOException {
        BufferedReader reader=null;
        InputStream stream = null;
        HttpsURLConnection connection = null;
        try {
            URL url=new URL(path);
            connection =(HttpsURLConnection)url.openConnection();
            connection.setRequestMethod("GET");
            connection.setReadTimeout(10000);
            connection.connect();
            stream = connection.getInputStream();
            reader= new BufferedReader(new InputStreamReader(stream));
            StringBuilder buf=new StringBuilder();
            String line;
            while ((line=reader.readLine()) != null) {
                buf.append(line).append("\n");
            }
            return(buf.toString());
        }
        finally {
            if (reader != null) {
                reader.close();
            }
            if (stream != null) {
                stream.close();
            }
            if (connection != null) {
                connection.disconnect();
            }
        }
    }
}

Переделал 


    public class MainFragment extends Fragment{
    final public String URL_POSTER = "https://udmfil.ru/";


    public static MainFragment newInstance() {
        return new MainFragment();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        DownLoad FOG = new DownLoad();
        FOG.execute(URL_POSTER);
        String result_post = String.valueOf(FOG);
        Log.i("URL",result_post);
        return inflater.inflate(R.layout.main_fragment, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        new ViewModelProvider(this).get(MainViewModel.class);
    }
    public class DownLoad extends AsyncTask<String,Void,String[]> {

        @Override
        protected String[] doInBackground(String... strings) {
            HttpURLConnection connection = null;
            BufferedReader reader= null;

            try {
                URL url = new URL(strings[0]);
                connection = (HttpURLConnection) url.openConnection();
                connection.connect();

                InputStream stream = connection.getInputStream();
                reader = new BufferedReader(new InputStreamReader(stream));

                StringBuilder buffer = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null)
                    buffer.append(line);
                    Log.i("URL", String.valueOf(buffer));
                /*String pos = buffer.toString();
                int indexPost, i = 1;
                String postB;
                do {
                    indexPost = pos.indexOf("m-img buy") + 21;
                    Log.i("URL", String.valueOf(indexPost));
                    if (indexPost != -1){
                        postB = pos.substring(indexPost, indexPost + 55);
                        Log.i("URL",postB);
                        strings[i] = postB;
                        indexPost = indexPost +55;
                        pos = pos.substring(indexPost);
                        Log.i("FLAG",pos);
                        i++;
                        Log.i("FLAG",strings[i]);
                        Log.i("URL", String.valueOf(i));
                    }
                }while (indexPost != -1);*/
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (connection != null)
                    connection.disconnect();
                try {
                    if (reader != null)
                        reader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }

            }

            return strings;
        }
    }
}


java.lang.RuntimeException: An error occurred while executing doInBackground()
 at android.os.AsyncTask$4.done(Unknown Source:27)
 at java.util.concurrent.FutureTask.finishCompletion(Unknown Source:36)
 at java.util.concurrent.FutureTask.setException(Unknown Source:23)
 at java.util.concurrent.FutureTask.run(Unknown Source:40)
 at android.os.AsyncTask$SerialExecutor$1.run(Unknown Source:2)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source:79)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source:2)
 at java.lang.Thread.run(Unknown Source:4)
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
 at java.net.Inet6AddressImpl.lookupHostByName(Unknown Source:111)
 at java.net.Inet6AddressImpl.lookupAllHostAddr(Unknown Source:22)
 at java.net.InetAddress.getAllByName(Unknown Source:3)
 at com.android.okhttp.Dns$1.lookup(Dns.java:41)
 at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:178)
 at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:144)
 at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:86)
 at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:176)
 at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
 at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
 at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
 at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
 at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
 at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:131)
 at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:90)
 at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:30)
 at com.example.myapplication.ui.main.MainFragment$DownLoad.doInBackground(MainFragment.java:58)
 at com.example.myapplication.ui.main.MainFragment$DownLoad.doInBackground(MainFragment.java:48)
 at android.os.AsyncTask$3.call(Unknown Source:20)
 at java.util.concurrent.FutureTask.run(Unknown Source:31)
Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
 at libcore.io.Linux.android_getaddrinfo(Native Method)
 at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
 at libcore.io.BlockGuardOs.android_getaddrinfo(BlockGuardOs.java:200)
 at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
 at java.net.Inet6AddressImpl.lookupHostByName(Unknown Source:51)
Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
 
Теперь такое вот получается.

[rielyn]

The annex closes because the code is wrong. Where and what exactly does stacktrace say, it's desirable to throw him down here, because without that, it's only possible to wonder what's wrong.

upd. Expersion NetworkOnMainThreadException says that you use online queries in the main flow, use AsyncTask for example.