Сбой приложения на SocketTimeoutException в Android

Question

Я реализовал AsyncTask в Activity правильно (на основании многих источников).

Также я исследовал SocketTimeoutException и исключение catche, как вы можете видеть в коде ниже.

Во всяком случае, когда я останавливаюсь webapi и моделировать SocketTimeoutException приложение вылетает сразу. (Пожалуйста, проверьте сообщение об ошибке.)

Код отладки идет к IOException и тогда я вижу сообщение об ошибке и приложение перезагружается.

Код

private class FetchHauls extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            HttpURLConnection urlConnection = null;
            BufferedReader reader = null;

            try {
                AppSettings.ComplexPreferences complexPreferences = AppSettings.ComplexPreferences.getComplexPreferences(context, "App_Settings", 0);
                AppSettings appSettings = complexPreferences.getObject("App_Settings", AppSettings.class);
                if (appSettings != null) {
                    String uri = appSettings.getIpAddress() + "/api/Version1/GetGrandTotalStats";

                    GrandTotalStatsRequest grandTotalStatsRequest = new GrandTotalStatsRequest();
                    Date d = new Date();
                    CharSequence timeOfRequest = DateFormat.format("yyyy-MM-dd HH:mm:ss", d.getTime()); 
                    grandTotalStatsRequest.AtTime = timeOfRequest.toString();
                    grandTotalStatsRequest.DeviceID = appSettings.getDeviceID();

                    grandTotalStatsRequest.DeviceSerialNumber = appSettings.getSerialNumber();

                    Gson gson = new Gson();
                    String json = gson.toJson(grandTotalStatsRequest);

                    //Connect
                    urlConnection = (HttpURLConnection) ((new URL(uri).openConnection()));
                    urlConnection.setDoOutput(true);
                    urlConnection.setRequestProperty("Content-Type", "application/json");
                    urlConnection.setRequestProperty("Accept", "application/json");
                    urlConnection.setRequestMethod("POST");
                    urlConnection.setConnectTimeout(60000);
                    urlConnection.setReadTimeout(55000);
                    urlConnection.connect();

                    //Write
                    OutputStream outputStream = urlConnection.getOutputStream();
                    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                    writer.write(json);
                    writer.close();
                    outputStream.close();

                    String result = null;
                    //Read
                    InputStream inputStream = urlConnection.getInputStream();
                    if (inputStream != null) {
                        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));

                        String l = null;
                        StringBuilder sb = new StringBuilder();

                        while ((l = bufferedReader.readLine()) != null) {
                            sb.append(l);
                        }

                        bufferedReader.close();

                        result = sb.toString();
                    }

                    return result;
                }
            } catch (IOException e) {
            } catch (Exception e) {
            } finally {
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException ex) {
                    }
                }
            }

            return null;
        }

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

            if (isCancelled()) {
                return;
            }

            swiperefresh.setRefreshing(false);
            taskFetchHauls = null;
            if (TextUtils.isEmpty(s)) return;

            try {
                // Some code...

            } catch (Exception ex) {
                Log.e(PAGE_TITLE, ex.getMessage());
            }
        }
    }

}

ошибка

java.net.SocketTimeoutException: failed to connect to /172.15.15.2 (port 1067) after 60000ms
                        at libcore.io.IoBridge.connectErrno(IoBridge.java:169)
                        at libcore.io.IoBridge.connect(IoBridge.java:122)
                        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
                        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
                        at java.net.Socket.connect(Socket.java:884)
                        at com.android.okhttp.internal.Platform.connectSocket(Platform.java:117)
                        at com.android.okhttp.internal.http.SocketConnector.connectRawSocket(SocketConnector.java:160)
                        at com.android.okhttp.internal.http.SocketConnector.connectCleartext(SocketConnector.java:67)
                        at com.android.okhttp.Connection.connect(Connection.java:152)
                        at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:185)
                        at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)
                        at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:341)
                        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
                        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
                        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
                        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
                        at android.apps.ktk.company.gpsmegatracker.Activities.GrandStatActivity$FetchHauls.doInBackground(GrandStatActivity.java:291)
                        at android.apps.ktk.company.gpsmegatracker.Activities.GrandStatActivity$FetchHauls.doInBackground(GrandStatActivity.java:259)
                        at android.os.AsyncTask$2.call(AsyncTask.java:295)
                        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
                        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                        at java.lang.Thread.run(Thread.java:818)
Disconnected from the target VM, address: 'localhost:8617', transport: 'socket'

Answer 1

Если вы хотите поймать SocketTimeoutException, то вы должны использовать следующий шаблон. Обратите внимание, что мы отлавливаем исключения от наиболее специфичных до наиболее общих. Так как SocketTimeoutException это ребенок IOExceptionЛовим первое первым. Использование обратного порядка приведет к ошибке, которую вы видели. Наконец, мы ловим общие Exception прошлой.

@Override
protected String doInBackground(String... params) {
    HttpURLConnection urlConnection = null;
    BufferedReader reader = null;

    try {
        // make the async call

    }
    catch (SocketTimeoutException se) {
        // display timeout alert to user
    }
    catch (IOException e) {
        // handle general IO error
    }
    catch (Exception e) {
        // just in case you missed anything else
    }
    finally {
        if (urlConnection != null) {
            urlConnection.disconnect();
        }
        if (reader != null) {
            try {
                reader.close();
            } catch (final IOException ex) {
            }
        }
    }
}