Java tutorial
/****************************************************************************** * Project: NextGIS mobile * Purpose: Mobile GIS for Android. * Author: Dmitry Baryshnikov (aka Bishop), polimax@mail.ru ****************************************************************************** * Copyright (C) 2012-2013 NextGIS * * 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 2 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.nextgis.mobile.services; import java.io.IOException; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.utils.URLEncodedUtils; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import com.nextgis.mobile.util.Constants; import com.nextgis.mobile.PositionDatabase; import com.nextgis.mobile.PreferencesActivity; import com.nextgis.mobile.util.NetworkUtil; import android.app.AlarmManager; import android.app.PendingIntent; import android.app.Service; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.AsyncTask; import android.os.IBinder; import android.telephony.TelephonyManager; import android.text.format.DateUtils; import android.text.format.Time; import android.util.Log; import static com.nextgis.mobile.util.Constants.*; public class DataSendService extends Service { private SQLiteDatabase PositionDB; private PositionDatabase dbHelper; protected NetworkUtil networkUtil; @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see android.app.Service#onCreate() */ @Override public void onCreate() { Log.d(TAG, "onCreate()"); super.onCreate(); dbHelper = new PositionDatabase(getApplicationContext()); PositionDB = dbHelper.getWritableDatabase(); networkUtil = new NetworkUtil(this); } /* (non-Javadoc) * @see android.app.Service#onDestroy() */ @Override public void onDestroy() { Log.d(TAG, "onDestroy()"); dbHelper.close(); super.onDestroy(); } /* (non-Javadoc) * @see android.app.Service#onStartCommand(android.content.Intent, int, int) */ @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d(TAG, "Received start id " + startId + ": " + intent); super.onStartCommand(intent, flags, startId); if (intent == null) return START_STICKY; String action = intent.getAction(); if (action.equals(DATASEND_ACTION_STOP)) { //Toast.makeText(getApplicationContext(), "Send position service stoped", Toast.LENGTH_SHORT).show(); stopSelf(); } else if (action.equals(DATASEND_ACTION_START)) { SharedPreferences prefs = getSharedPreferences(Constants.SERVICE_PREF, MODE_MULTI_PROCESS); boolean bStart = prefs.getBoolean(Constants.KEY_PREF_SW_SENDPOS_SRV, false); if (bStart) new SendPositionDataTask().execute(getApplicationContext()); else //Toast.makeText(getApplicationContext(), "Send position service started", Toast.LENGTH_SHORT).show(); stopSelf(); } return START_STICKY; } private class SendPositionDataTask extends AsyncTask<Context, Void, Void> { @Override protected Void doInBackground(Context... context) { SharedPreferences prefs = getSharedPreferences("preferences", MODE_MULTI_PROCESS); String sHost = prefs.getString(Constants.KEY_PREF_STORAGE_SITE, "http://gis-lab.info"); long nMinTimeBetweenSend = prefs.getLong(Constants.KEY_PREF_TIME_DATASEND + "_long", DateUtils.MINUTE_IN_MILLIS); boolean bEnergyEconomy = prefs.getBoolean(Constants.KEY_PREF_SW_ENERGY_ECO, true); String sId = prefs.getString(Constants.KEY_PREF_USER_ID, PreferencesActivity.GetDeviceId()); Log.d(TAG, "start SendPositionDataTask MinTime:" + nMinTimeBetweenSend + " user id:" + sId); //Send data SendPostionData(sHost, sId); //Setup next send ScheduleNextUpdate(context[0], sHost, nMinTimeBetweenSend, bEnergyEconomy, prefs.getBoolean(Constants.KEY_PREF_SW_ENERGY_ECO, false)); return null; } protected void ScheduleNextUpdate(Context context, String sHost, long nMinTimeBetweenSend, boolean bEnergyEconomy, boolean bStart) { if (context == null) return; Log.d(TAG, "Schedule Next Update for sender " + bStart); if (!bStart) return; Intent intent = new Intent(DATASEND_ACTION_START); PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // The update frequency should often be user configurable. This is not. long currentTimeMillis = System.currentTimeMillis(); long nextUpdateTimeMillis = currentTimeMillis + nMinTimeBetweenSend; Time nextUpdateTime = new Time(); nextUpdateTime.set(nextUpdateTimeMillis); AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); if (bEnergyEconomy) alarmManager.set(AlarmManager.RTC, nextUpdateTimeMillis, pendingIntent); else alarmManager.set(AlarmManager.RTC_WAKEUP, nextUpdateTimeMillis, pendingIntent); } protected void SendPostionData(String sHost, String sId) { Log.d(TAG, "SendPostionData"); if (!networkUtil.isNetworkAvailible()) return; //Queue records to send Cursor cursor = PositionDB.query(PositionDatabase.TABLE_POS, null, null, null, null, null, null); cursor.moveToFirst(); Log.d(TAG, "record count: " + cursor.getCount()); List<Long> delete_ids = new ArrayList<Long>(); while (!cursor.isAfterLast()) { String sAcc = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_ACCURACY)); String sAlt = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_ALTITUDE)); String sDir = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_DIRECTION)); String sLat = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_LAT)); String sLon = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_LON)); String sProv = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_PROVIDER)); String sSpeed = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_SPEED)); String sTime = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_TIME)); String sTime_UTC = cursor.getString(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_TIME_UTC)); Long nId = cursor.getLong(cursor.getColumnIndexOrThrow(PositionDatabase.COLUMN_ID)); List<NameValuePair> params = new LinkedList<NameValuePair>(); params.add(new BasicNameValuePair("uid", sId)); params.add(new BasicNameValuePair("acc", sAcc)); params.add(new BasicNameValuePair("alt", sAlt)); params.add(new BasicNameValuePair("dir", sDir)); params.add(new BasicNameValuePair("lat", sLat)); params.add(new BasicNameValuePair("lon", sLon)); params.add(new BasicNameValuePair("prov", sProv)); params.add(new BasicNameValuePair("speed", sSpeed)); params.add(new BasicNameValuePair("time", sTime)); params.add(new BasicNameValuePair("time_utc", sTime_UTC)); String sData = URLEncodedUtils.format(params, "utf-8"); if (SendData(sHost, sData)) { //delete record delete_ids.add(nId); } cursor.moveToNext(); } cursor.close(); for (Long delete_id : delete_ids) { PositionDB.delete(PositionDatabase.TABLE_POS, PositionDatabase.COLUMN_ID + " = " + delete_id, null); } } protected boolean SendData(String sHost, String sData) { Log.d(TAG, "SendData: host=" + sHost + " data=" + sData); HttpClient httpClient = new DefaultHttpClient(); //HttpContext localContext = new BasicHttpContext(); HttpGet httpGet = new HttpGet(sHost + "?" + sData); try { //HttpResponse response = httpClient.execute(httpGet, localContext); HttpResponse response = httpClient.execute(httpGet); if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) return true; } catch (ClientProtocolException e) { // TODO Auto-generated catch block //e.printStackTrace(); return false; } catch (IOException e) { // TODO Auto-generated catch block //e.printStackTrace(); return false; } return false; } /* (non-Javadoc) * @see android.os.AsyncTask#onPostExecute(java.lang.Object) */ @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub super.onPostExecute(result); stopSelf(); } } }