Java tutorial
/* * WiFi Analyzer * Copyright (C) 2016 VREM Software Development <VREMSoftwareDevelopment@gmail.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> */ package com.vrem.wifianalyzer.vendor.model; import android.os.AsyncTask; import com.vrem.wifianalyzer.Logger; import com.vrem.wifianalyzer.MainContext; import org.apache.commons.lang3.StringUtils; import org.json.JSONException; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; class RemoteCall extends AsyncTask<String, Void, String> { static final String MAC_VENDOR_LOOKUP = "http://api.macvendors.com/%s"; @Override protected String doInBackground(String... params) { if (params == null || params.length < 1 || StringUtils.isBlank(params[0])) { return StringUtils.EMPTY; } String macAddress = params[0]; String request = String.format(MAC_VENDOR_LOOKUP, macAddress); BufferedReader bufferedReader = null; try { URLConnection urlConnection = getURLConnection(request); bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream())); StringBuilder response = new StringBuilder(); String line; while ((line = bufferedReader.readLine()) != null) { response.append(line); } String vendorName = VendorNameUtils.cleanVendorName(response.toString().trim()); if (StringUtils.isNotBlank(vendorName)) { return new RemoteResult(macAddress, vendorName).toJson(); } return StringUtils.EMPTY; } catch (Exception e) { return StringUtils.EMPTY; } finally { if (bufferedReader != null) { try { bufferedReader.close(); } catch (IOException e) { // ignore } } } } URLConnection getURLConnection(String request) throws IOException { return new URL(request).openConnection(); } @Override protected void onPostExecute(String result) { if (StringUtils.isNotBlank(result)) { Logger logger = MainContext.INSTANCE.getLogger(); try { RemoteResult remoteResult = new RemoteResult(result); String macAddress = remoteResult.getMacAddress(); String vendorName = remoteResult.getVendorName(); if (StringUtils.isNotBlank(vendorName) && StringUtils.isNotBlank(macAddress)) { logger.info(this, macAddress + " " + vendorName); Database database = MainContext.INSTANCE.getDatabase(); database.insert(macAddress, vendorName); } } catch (JSONException e) { logger.error(this, result, e); } } } }