Java tutorial
/* * AnyPlace: A free and open Indoor Navigation Service with superb accuracy! * * Anyplace is a first-of-a-kind indoor information service offering GPS-less * localization, navigation and search inside buildings using ordinary smartphones. * * Author(s): Timotheos Constambeys * * Supervisor: Demetrios Zeinalipour-Yazti * * URL: http://anyplace.cs.ucy.ac.cy * Contact: anyplace@cs.ucy.ac.cy * * Copyright (c) 2015, Data Management Systems Lab (DMSL), University of Cyprus. * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in the * Software without restriction, including without limitation the rights to use, copy, * modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to the * following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * */ package com.dmsl.anyplace.tasks; import java.net.SocketTimeoutException; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import org.apache.http.conn.ConnectTimeoutException; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.os.AsyncTask; import com.dmsl.anyplace.AnyplaceAPI; import com.dmsl.anyplace.nav.FloorModel; import com.dmsl.anyplace.utils.NetworkUtils; public class FetchFloorsByBuidTask extends AsyncTask<Void, Void, String> { public interface FetchFloorsByBuidTaskListener { void onErrorOrCancel(String result); void onSuccess(String result, List<FloorModel> floors); } private FetchFloorsByBuidTaskListener mListener; private Context ctx; private List<FloorModel> floors = new ArrayList<FloorModel>(); private String buid; private boolean success = false; private ProgressDialog dialog; private Boolean showDialog = true; public FetchFloorsByBuidTask(FetchFloorsByBuidTaskListener fetchFloorsByBuidTaskListener, Context ctx, String buid) { this.mListener = fetchFloorsByBuidTaskListener; this.ctx = ctx; this.buid = buid; } public FetchFloorsByBuidTask(FetchFloorsByBuidTaskListener fetchFloorsByBuidTaskListener, Context ctx, String buid, Boolean showDialog) { this.mListener = fetchFloorsByBuidTaskListener; this.ctx = ctx; this.buid = buid; this.showDialog = showDialog; } @Override protected void onPreExecute() { if (showDialog) { dialog = new ProgressDialog(ctx); dialog.setIndeterminate(true); dialog.setTitle("Fetching floors"); dialog.setMessage("Please be patient..."); dialog.setCancelable(true); dialog.setCanceledOnTouchOutside(false); dialog.setOnCancelListener(new DialogInterface.OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { // finishJob(); FetchFloorsByBuidTask.this.cancel(true); } }); dialog.show(); } } @Override protected String doInBackground(Void... params) { if (!NetworkUtils.isOnline(ctx)) { return "No connection available!"; } try { JSONObject j = new JSONObject(); try { j.put("username", "username"); j.put("password", "pass"); j.put("buid", this.buid); } catch (JSONException e) { return "Error requesting the floors for the buildings!"; } String response = NetworkUtils.downloadHttpClientJsonPostGzip(AnyplaceAPI.getFetchFloorsByBuidUrl(), j.toString()); JSONObject json = new JSONObject(response); if (json.has("status") && json.getString("status").equalsIgnoreCase("error")) { return "Error Message: " + json.getString("message"); } // process the buildings received FloorModel b; JSONArray buids_json = new JSONArray(json.getString("floors")); if (buids_json.length() == 0) { return "Error: 0 Floors found"; } for (int i = 0, sz = buids_json.length(); i < sz; i++) { JSONObject cp = (JSONObject) buids_json.get(i); b = new FloorModel(); b.buid = cp.getString("buid"); b.floor_name = cp.getString("floor_name"); b.floor_number = cp.getString("floor_number"); b.description = cp.getString("description"); // use optString() because these values might not exist of a // floor plan has not been set for this floor b.bottom_left_lat = cp.optString("bottom_left_lat"); b.bottom_left_lng = cp.optString("bottom_left_lng"); b.top_right_lat = cp.optString("top_right_lat"); b.top_right_lng = cp.optString("top_right_lng"); floors.add(b); } Collections.sort(floors); success = true; return "Successfully fetched floors"; } catch (ConnectTimeoutException e) { return "Cannot connect to Anyplace service!"; } catch (SocketTimeoutException e) { return "Communication with the server is taking too long!"; } catch (UnknownHostException e) { return "No connection available!"; } catch (Exception e) { // Log.d("fetching floors task", e.getMessage()); return "Error fetching floors. [ " + e.getMessage() + " ]"; } } @Override protected void onPostExecute(String result) { // removes the progress dialog if (showDialog) dialog.dismiss(); if (success) { mListener.onSuccess(result, floors); } else { // there was an error during the process mListener.onErrorOrCancel(result); } } @Override protected void onCancelled(String result) { if (showDialog) dialog.dismiss(); mListener.onErrorOrCancel("Floor fetching cancelled..."); } @Override protected void onCancelled() { // just for < API 11 if (showDialog) dialog.dismiss(); mListener.onErrorOrCancel("Floor fetching cancelled..."); } }