Java tutorial
/* Copyright 2011 Robert Spencer Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package com.networkmanagerapp; import java.io.BufferedReader; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URLEncoder; import org.apache.http.HttpHost; import org.apache.http.HttpResponse; import org.apache.http.HttpVersion; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import android.app.IntentService; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.preference.PreferenceManager; import android.util.Log; /** * This class creates an IntentService to download the XML files in a service in the background * @author rjs07u * */ public class JSONBackgroundDownloaderService extends IntentService { public static final String NEW_DATA_AVAILABLE = "New XML Downloaded"; private NotificationManager mNM; /** * The constructor. Passes a name to the superclass for debugging purposes. */ public JSONBackgroundDownloaderService() { super("JSONBackgroundDownloaderService"); } /** * Displays a notification in the system notification area */ private void showNotification() { CharSequence text = getText(R.string.download_service_started); Notification notification = new Notification(R.drawable.ic_stat_networkman, text, System.currentTimeMillis()); PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, NetworkManagerMainActivity.class), 0); notification.setLatestEventInfo(this, text, text, contentIntent); mNM.notify(R.string.download_service_started, notification); } /** * Delegate method to run the specified intent in another thread. * @param arg0 The intent to run in the background */ @Override protected void onHandleIntent(Intent arg0) { mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); showNotification(); String filename = arg0.getStringExtra("FILENAME"); String jsonFile = arg0.getStringExtra("JSONFILE"); try { String password = PreferenceManager.getDefaultSharedPreferences(this).getString("password_preference", ""); Log.d("password", password); String ip = PreferenceManager.getDefaultSharedPreferences(this).getString("ip_preference", "192.168.1.1"); String enc = URLEncoder.encode(ip, "UTF-8"); String scriptUrl = "http://" + enc + ":1080" + filename; HttpParams params = new BasicHttpParams(); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, "utf-8"); // Set the timeout in milliseconds until a connection is established. int timeoutConnection = 3000; HttpConnectionParams.setConnectionTimeout(params, timeoutConnection); // Set the default socket timeout (SO_TIMEOUT) // in milliseconds which is the timeout for waiting for data. int timeoutSocket = 20000; HttpConnectionParams.setSoTimeout(params, timeoutSocket); HttpHost targetHost = new HttpHost(enc, 1080, "http"); DefaultHttpClient client = new DefaultHttpClient(params); client.getCredentialsProvider().setCredentials( new AuthScope(targetHost.getHostName(), targetHost.getPort()), new UsernamePasswordCredentials("root", password)); HttpGet request = new HttpGet(scriptUrl); HttpResponse response = client.execute(targetHost, request); Log.d("JBDS", response.getStatusLine().toString()); InputStream in = response.getEntity().getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder str = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { str.append(line + "\n"); } in.close(); if (str.toString().equals("Success\n")) { String xmlUrl = "http://" + enc + ":1080/json" + jsonFile; request = new HttpGet(xmlUrl); HttpResponse jsonData = client.execute(targetHost, request); in = jsonData.getEntity().getContent(); reader = new BufferedReader(new InputStreamReader(in)); str = new StringBuilder(); line = null; while ((line = reader.readLine()) != null) { str.append(line + "\n"); } in.close(); FileOutputStream fos = openFileOutput(jsonFile.substring(1), Context.MODE_PRIVATE); fos.write(str.toString().getBytes()); fos.close(); } } catch (MalformedURLException ex) { Log.e("NETWORKMANAGER_XBD_MUE", ex.getMessage()); } catch (IOException e) { try { Log.e("NETWORK_MANAGER_XBD_IOE", e.getMessage()); StackTraceElement[] st = e.getStackTrace(); for (int i = 0; i < st.length; i++) { Log.e("NETWORK_MANAGER_XBD_IOE", st[i].toString()); } } catch (NullPointerException ex) { Log.e("Network_manager_xbd_npe", ex.getLocalizedMessage()); } } finally { mNM.cancel(R.string.download_service_started); Intent bci = new Intent(NEW_DATA_AVAILABLE); sendBroadcast(bci); stopSelf(); } } }