Java tutorial
/** CycleTracks, (c) 2009 San Francisco County Transportation Authority * San Francisco, CA, USA * * Licensed under the GNU GPL version 3.0. * See http://www.gnu.org/licenses/gpl-3.0.txt for a copy of GPL version 3.0. * * @author Billy Charlton <billy.charlton@sfcta.org> * */ package org.sfcta.cycletracks; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Vector; import java.util.Map.Entry; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.json.JSONException; import org.json.JSONObject; import android.content.Context; import android.content.SharedPreferences; import android.database.Cursor; import android.os.AsyncTask; import android.provider.Settings.System; import android.util.Log; import android.widget.Toast; public class TripUploader extends AsyncTask<Long, Integer, Boolean> { Context mCtx; DbAdapter mDb; public static final String TRIP_COORDS_TIME = "rec"; public static final String TRIP_COORDS_LAT = "lat"; public static final String TRIP_COORDS_LON = "lon"; public static final String TRIP_COORDS_ALT = "alt"; public static final String TRIP_COORDS_SPEED = "spd"; public static final String TRIP_COORDS_HACCURACY = "hac"; public static final String TRIP_COORDS_VACCURACY = "vac"; public static final String USER_AGE = "age"; public static final String USER_EMAIL = "email"; public static final String USER_GENDER = "gender"; public static final String USER_ZIP_HOME = "homeZIP"; public static final String USER_ZIP_WORK = "workZIP"; public static final String USER_ZIP_SCHOOL = "schoolZIP"; public static final String USER_CYCLING_FREQUENCY = "cyclingFreq"; public TripUploader(Context ctx) { super(); this.mCtx = ctx; this.mDb = new DbAdapter(this.mCtx); } private JSONObject getCoordsJSON(long tripId) throws JSONException { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); mDb.openReadOnly(); Cursor tripCoordsCursor = mDb.fetchAllCoordsForTrip(tripId); // Build the map between JSON fieldname and phone db fieldname: Map<String, Integer> fieldMap = new HashMap<String, Integer>(); fieldMap.put(TRIP_COORDS_TIME, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_TIME)); fieldMap.put(TRIP_COORDS_LAT, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_LAT)); fieldMap.put(TRIP_COORDS_LON, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_LGT)); fieldMap.put(TRIP_COORDS_ALT, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_ALT)); fieldMap.put(TRIP_COORDS_SPEED, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_SPEED)); fieldMap.put(TRIP_COORDS_HACCURACY, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_ACC)); fieldMap.put(TRIP_COORDS_VACCURACY, tripCoordsCursor.getColumnIndex(DbAdapter.K_POINT_ACC)); // Build JSON objects for each coordinate: JSONObject tripCoords = new JSONObject(); while (!tripCoordsCursor.isAfterLast()) { JSONObject coord = new JSONObject(); coord.put(TRIP_COORDS_TIME, df.format(tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_TIME)))); coord.put(TRIP_COORDS_LAT, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_LAT)) / 1E6); coord.put(TRIP_COORDS_LON, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_LON)) / 1E6); coord.put(TRIP_COORDS_ALT, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_ALT))); coord.put(TRIP_COORDS_SPEED, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_SPEED))); coord.put(TRIP_COORDS_HACCURACY, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_HACCURACY))); coord.put(TRIP_COORDS_VACCURACY, tripCoordsCursor.getDouble(fieldMap.get(TRIP_COORDS_VACCURACY))); tripCoords.put(coord.getString("rec"), coord); tripCoordsCursor.moveToNext(); } tripCoordsCursor.close(); mDb.close(); return tripCoords; } private JSONObject getUserJSON() throws JSONException { JSONObject user = new JSONObject(); Map<String, Integer> fieldMap = new HashMap<String, Integer>(); fieldMap.put(USER_AGE, new Integer(UserInfoActivity.PREF_AGE)); fieldMap.put(USER_EMAIL, new Integer(UserInfoActivity.PREF_EMAIL)); fieldMap.put(USER_GENDER, new Integer(UserInfoActivity.PREF_GENDER)); fieldMap.put(USER_ZIP_HOME, new Integer(UserInfoActivity.PREF_ZIPHOME)); fieldMap.put(USER_ZIP_WORK, new Integer(UserInfoActivity.PREF_ZIPWORK)); fieldMap.put(USER_ZIP_SCHOOL, new Integer(UserInfoActivity.PREF_ZIPSCHOOL)); SharedPreferences settings = this.mCtx.getSharedPreferences("PREFS", 0); for (Entry<String, Integer> entry : fieldMap.entrySet()) { user.put(entry.getKey(), settings.getString(entry.getValue().toString(), null)); } user.put(USER_CYCLING_FREQUENCY, Integer.parseInt(settings.getString("" + UserInfoActivity.PREF_CYCLEFREQ, "0")) / 100); return user; } private Vector<String> getTripData(long tripId) { Vector<String> tripData = new Vector<String>(); mDb.openReadOnly(); Cursor tripCursor = mDb.fetchTrip(tripId); String note = tripCursor.getString(tripCursor.getColumnIndex(DbAdapter.K_TRIP_NOTE)); String purpose = tripCursor.getString(tripCursor.getColumnIndex(DbAdapter.K_TRIP_PURP)); Double startTime = tripCursor.getDouble(tripCursor.getColumnIndex(DbAdapter.K_TRIP_START)); Double endTime = tripCursor.getDouble(tripCursor.getColumnIndex(DbAdapter.K_TRIP_END)); tripCursor.close(); mDb.close(); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); tripData.add(note); tripData.add(purpose); tripData.add(df.format(startTime)); tripData.add(df.format(endTime)); return tripData; } public String getDeviceId() { String androidId = System.getString(this.mCtx.getContentResolver(), System.ANDROID_ID); String androidBase = "androidDeviceId-"; if (androidId == null) { // This happens when running in the Emulator final String emulatorId = "android-RunningAsTestingDeleteMe"; return emulatorId; } String deviceId = androidBase.concat(androidId); return deviceId; } private List<NameValuePair> getPostData(long tripId) throws JSONException { JSONObject coords = getCoordsJSON(tripId); JSONObject user = getUserJSON(); String deviceId = getDeviceId(); Vector<String> tripData = getTripData(tripId); String notes = tripData.get(0); String purpose = tripData.get(1); String startTime = tripData.get(2); String endTime = tripData.get(3); List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); nameValuePairs.add(new BasicNameValuePair("coords", coords.toString())); nameValuePairs.add(new BasicNameValuePair("user", user.toString())); nameValuePairs.add(new BasicNameValuePair("device", deviceId)); nameValuePairs.add(new BasicNameValuePair("notes", notes)); nameValuePairs.add(new BasicNameValuePair("purpose", purpose)); nameValuePairs.add(new BasicNameValuePair("start", startTime)); nameValuePairs.add(new BasicNameValuePair("end", endTime)); nameValuePairs.add(new BasicNameValuePair("version", "2")); return nameValuePairs; } private static String convertStreamToString(InputStream is) { /* * To convert the InputStream to String we use the BufferedReader.readLine() * method. We iterate until the BufferedReader return null which means * there's no more data to read. Each line will appended to a StringBuilder * and returned as String. */ BufferedReader reader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = null; try { while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } } catch (IOException e) { e.printStackTrace(); } finally { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } boolean uploadOneTrip(long currentTripId) { boolean result = false; List<NameValuePair> nameValuePairs; try { nameValuePairs = getPostData(currentTripId); } catch (JSONException e) { e.printStackTrace(); return result; } Log.v("PostData", nameValuePairs.toString()); HttpClient client = new DefaultHttpClient(); final String postUrl = "http://bikedatabase.sfcta.org/post/"; HttpPost postRequest = new HttpPost(postUrl); try { postRequest.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = client.execute(postRequest); String responseString = convertStreamToString(response.getEntity().getContent()); Log.v("httpResponse", responseString); JSONObject responseData = new JSONObject(responseString); if (responseData.getString("status").equals("success")) { mDb.open(); mDb.updateTripStatus(currentTripId, TripData.STATUS_SENT); mDb.close(); result = true; } } catch (IllegalStateException e) { e.printStackTrace(); return false; } catch (IOException e) { e.printStackTrace(); return false; } catch (JSONException e) { e.printStackTrace(); return false; } return result; } @Override protected Boolean doInBackground(Long... tripid) { // First, send the trip user asked for: Boolean result = uploadOneTrip(tripid[0]); // Then, automatically try and send previously-completed trips // that were not sent successfully. Vector<Long> unsentTrips = new Vector<Long>(); mDb.openReadOnly(); Cursor cur = mDb.fetchUnsentTrips(); if (cur != null && cur.getCount() > 0) { //pd.setMessage("Sent. You have previously unsent trips; submitting those now."); while (!cur.isAfterLast()) { unsentTrips.add(new Long(cur.getLong(0))); cur.moveToNext(); } cur.close(); } mDb.close(); for (Long trip : unsentTrips) { result &= uploadOneTrip(trip); } return result; } @Override protected void onPreExecute() { Toast.makeText(mCtx.getApplicationContext(), "Submitting trip. Thanks for using CycleTracks!", Toast.LENGTH_LONG).show(); } @Override protected void onPostExecute(Boolean result) { try { if (result) { Toast.makeText(mCtx.getApplicationContext(), "Trip uploaded successfully.", Toast.LENGTH_SHORT) .show(); } else { Toast.makeText(mCtx.getApplicationContext(), "CycleTracks couldn't upload the trip, and will retry when your next trip is completed.", Toast.LENGTH_LONG).show(); } } catch (Exception e) { // Just don't toast if the view has gone out of context } } }