Java tutorial
/* * Copyright (C) 2014 jonas.oreland@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 export.format; import android.annotation.TargetApi; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.location.Location; import android.os.Build; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import util.Constants.DB; import util.Formatter; /** * @author jonas.oreland@gmail.com */ @TargetApi(Build.VERSION_CODES.FROYO) public class FacebookCourse { long mID = 0; SQLiteDatabase mDB = null; Formatter formatter = null; SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ", Locale.getDefault()); public FacebookCourse(Context ctx, SQLiteDatabase db) { mDB = db; formatter = new Formatter(ctx); } String formatTime(long time) { return dateFormat.format(new Date(time)); } JSONObject pace(double distance, double duration) throws JSONException { if (distance != 0) return pace(duration / distance); return null; } JSONObject pace(double val) throws JSONException { if (formatter.getUnitMeters() == Formatter.km_meters) { return new JSONObject().put("value", val).put("units", "s/m"); } else { return new JSONObject().put("value", val).put("units", " s/ft"); } } public JSONObject export(long activityId, boolean showTrail, JSONObject runObj) throws IOException, JSONException { final String[] aColumns = { DB.ACTIVITY.NAME, DB.ACTIVITY.COMMENT, DB.ACTIVITY.START_TIME, DB.ACTIVITY.DISTANCE, DB.ACTIVITY.TIME, DB.ACTIVITY.SPORT }; Cursor cursor = mDB.query(DB.ACTIVITY.TABLE, aColumns, "_id = " + activityId, null, null, null, null); cursor.moveToFirst(); if (runObj != null) { runObj.put("sport", cursor.getInt(5)); runObj.put("startTime", cursor.getLong(2)); runObj.put("endTime", cursor.getLong(2) + cursor.getLong(4)); if (!cursor.isNull(1)) runObj.put("comment", cursor.getString(1)); } JSONObject obj = new JSONObject(); double distance = cursor.getDouble(3); long duration = cursor.getLong(4); cursor.close(); double unitMeters = formatter.getUnitMeters(); if (distance < unitMeters) { obj.put("distance", new JSONObject().put("value", distance).put("units", "m")); } else { final int decimals = 1; double base = distance / unitMeters; double val = Formatter.round(base, decimals); obj.put("distance", new JSONObject().put("value", val).put("units", formatter.getUnitString())); } obj.put("duration", new JSONObject().put("value", duration).put("units", "s")); if (distance != 0) { obj.put("pace", pace(distance, duration)); } if (showTrail) { JSONArray trail = trail(activityId); if (trail != null) obj.put("metrics", trail); } return obj; } private JSONArray trail(long activityId) throws JSONException { final String cols[] = { DB.LOCATION.TYPE, DB.LOCATION.LATITUDE, DB.LOCATION.LONGITUDE, DB.LOCATION.TIME, DB.LOCATION.SPEED }; Cursor c = mDB.query(DB.LOCATION.TABLE, cols, DB.LOCATION.ACTIVITY + " = " + activityId, null, null, null, null); if (c.moveToFirst()) { Location prev = null, last = null; double sumDist = 0; long sumTime = 0; double accTime = 0; final double period = 30; JSONArray arr = new JSONArray(); do { switch (c.getInt(0)) { case DB.LOCATION.TYPE_START: case DB.LOCATION.TYPE_RESUME: last = new Location("Dill"); last.setLatitude(c.getDouble(1)); last.setLongitude(c.getDouble(2)); last.setTime(c.getLong(3)); accTime = period * 1000; // always emit first point // start/resume break; case DB.LOCATION.TYPE_END: accTime = period * 1000; // always emit last point case DB.LOCATION.TYPE_GPS: case DB.LOCATION.TYPE_PAUSE: Location l = new Location("Sill"); l.setLatitude(c.getDouble(1)); l.setLongitude(c.getDouble(2)); l.setTime(c.getLong(3)); if (!c.isNull(4)) l.setSpeed(c.getFloat(4)); if (last != null) { sumDist += l.distanceTo(last); sumTime += l.getTime() - last.getTime(); accTime += l.getTime() - last.getTime(); } prev = last; last = l; } if (Math.round(accTime / 1000) >= period) { arr.put(point(prev, last, sumTime, sumDist)); accTime -= period * 1000; } } while (c.moveToNext()); c.close(); return arr; } c.close(); return null; } private JSONObject point(Location prev, Location last, long sumTime, double sumDist) throws JSONException { JSONObject obj = new JSONObject(); obj.put("location", new JSONObject().put("latitude", last.getLatitude()).put("longitude", last.getLongitude())); obj.put("distance", new JSONObject().put("value", sumDist / 1000.0).put("units", "km")); obj.put("timestamp", formatTime(last.getTime())); if (last.hasSpeed() && last.getSpeed() > 0) { obj.put("pace", pace(1.0f / last.getSpeed())); } return obj; } }