Java tutorial
/* The MIT License Copyright (c) 2013 Nitesh Patel http://niteshpatel.github.io/ministocks 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 nitezh.ministock; import android.content.Context; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import org.json.JSONException; import org.json.JSONObject; import java.io.File; import java.util.*; public class UserData { private static final HashMap<String, HashMap<PortfolioField, String>> mPortfolioStockMap = new HashMap<String, HashMap<PortfolioField, String>>(); // Cache markers private static boolean mDirtyPortfolioStockMap = true; public static void addAppWidgetSize(Context context, int appWidgetId, int widgetSize) { // Record widgetSize Editor editor = Tools.getWidgetPreferences(context, appWidgetId).edit(); editor.putInt("widgetSize", widgetSize); editor.apply(); } public static void addAppWidgetId(Context context, int appWidgetId, Integer widgetSize) { // Get the existing widgetIds from the preferences SharedPreferences preferences = Tools.getAppPreferences(context); // Add the new appWidgetId StringBuilder rawAppWidgetIds = new StringBuilder(); rawAppWidgetIds.append(preferences.getString("appWidgetIds", "")); if (!rawAppWidgetIds.toString().equals("")) rawAppWidgetIds.append(","); rawAppWidgetIds.append(String.valueOf(appWidgetId)); // Update the preferences too Editor editor = preferences.edit(); editor.putString("appWidgetIds", rawAppWidgetIds.toString()); editor.apply(); // Only add the widget size if provided if (widgetSize != null) addAppWidgetSize(context, appWidgetId, widgetSize); } public static void delAppWidgetId(Context context, int appWidgetId) { // Get the existing widgetIds from the preferences SharedPreferences preferences = Tools.getAppPreferences(context); ArrayList<String> newAppWidgetIds = new ArrayList<String>(); Collections.addAll(newAppWidgetIds, preferences.getString("appWidgetIds", "").split(",")); // Remove the one to remove newAppWidgetIds.remove(String.valueOf(appWidgetId)); // Add the new appWidgetId StringBuilder appWidgetIds = new StringBuilder(); for (String id : newAppWidgetIds) appWidgetIds.append(id).append(","); // Remove trailing comma if (appWidgetIds.length() > 0) appWidgetIds.deleteCharAt(appWidgetIds.length() - 1); // Update the preferences too Editor editor = preferences.edit(); editor.putString("appWidgetIds", appWidgetIds.toString()); editor.apply(); } public static int[] getAppWidgetIds2(Context context) { // Get the widgetIds from the preferences SharedPreferences prefs = Tools.getAppPreferences(context); StringBuilder rawAppWidgetIds = new StringBuilder(); rawAppWidgetIds.append(prefs.getString("appWidgetIds", "")); // Create an array of appWidgetIds String[] appWidgetIds = rawAppWidgetIds.toString().split(","); int appWidgetIdsLength = 0; if (!rawAppWidgetIds.toString().equals("")) appWidgetIdsLength = appWidgetIds.length; int[] savedAppWidgetIds = new int[appWidgetIdsLength]; for (int i = 0; i < appWidgetIds.length; i++) if (!appWidgetIds[i].equals("")) savedAppWidgetIds[i] = Integer.parseInt(appWidgetIds[i]); return savedAppWidgetIds; } public static Set<String> getWidgetsStockSymbols(Context context) { Set<String> widgetStockSymbols = new HashSet<String>(); SharedPreferences widgetPreferences; // Add the stock symbols from the widget preferences for (int appWidgetId : getAppWidgetIds2(context)) { widgetPreferences = Tools.getWidgetPreferences(context, appWidgetId); if (widgetPreferences == null) continue; // If widget preferences were found, extract the stock symbols for (int i = 1; i < 11; i++) { String stockSymbol = widgetPreferences.getString("Stock" + i, ""); if (!stockSymbol.equals("")) widgetStockSymbols.add(stockSymbol); } } return widgetStockSymbols; } public static HashMap<String, HashMap<PortfolioField, String>> getPortfolioStockMap(Context context) { // If data is unchanged return cached version if (!mDirtyPortfolioStockMap) return mPortfolioStockMap; // Clear the old data mPortfolioStockMap.clear(); // Use the Json data if present String rawJson = Tools.getAppPreferences(context).getString("portfolioJson", ""); if (rawJson.equals("")) { // If there is no Json data then use the old style data for (String rawStock : Tools.getAppPreferences(context).getString("portfolio", "").split(",")) { String[] stockArray = rawStock.split(":"); // Skip empties and invalid formatted stocks if (stockArray.length != 2) continue; // Create stock map, ignoring any items with nulls String[] stockInfo = stockArray[1].split("\\|"); if (stockInfo.length > 0 && stockInfo[0] != null) { HashMap<PortfolioField, String> stockInfoMap = new HashMap<PortfolioField, String>(); for (PortfolioField f : PortfolioField.values()) { String data = ""; if (stockInfo.length > f.ordinal() && !stockInfo[f.ordinal()].equals("empty")) { data = stockInfo[f.ordinal()]; } stockInfoMap.put(f, data); } mPortfolioStockMap.put(stockArray[0], stockInfoMap); } } } else { JSONObject json = null; try { json = new JSONObject(rawJson); } catch (JSONException e) { e.printStackTrace(); } // Parse the stock info from the raw string Iterator keys; if (json != null) { keys = json.keys(); while (keys.hasNext()) { String key = keys.next().toString(); JSONObject itemData = new JSONObject(); try { itemData = json.getJSONObject(key); } catch (JSONException e) { e.printStackTrace(); } HashMap<PortfolioField, String> stockInfoMap = new HashMap<PortfolioField, String>(); for (PortfolioField f : PortfolioField.values()) { String data = ""; try { if (!itemData.get(f.name()).equals("empty")) { data = itemData.get(f.name()).toString(); } } catch (JSONException e) { e.printStackTrace(); } stockInfoMap.put(f, data); } mPortfolioStockMap.put(key, stockInfoMap); } } } // Set marker clean and return mDirtyPortfolioStockMap = false; return mPortfolioStockMap; } public static void setPortfolioStockMap(Context context, HashMap<String, HashMap<PortfolioField, String>> stockMap) { // Convert the portfolio stock map into a Json string to store in preferences JSONObject json = new JSONObject(); for (String symbol : stockMap.keySet()) { // Create the raw string, ignoring any items with nulls HashMap<PortfolioField, String> stockInfoMap = stockMap.get(symbol); if ((stockInfoMap.get(PortfolioField.PRICE) != null && !stockInfoMap.get(PortfolioField.PRICE).equals("")) || (stockInfoMap.get(PortfolioField.CUSTOM_DISPLAY) != null && !stockInfoMap.get(PortfolioField.CUSTOM_DISPLAY).equals(""))) { // Create a JSON object to store this data JSONObject itemData = new JSONObject(); try { json.put(symbol, itemData); } catch (JSONException e) { e.printStackTrace(); } for (PortfolioField f : PortfolioField.values()) { // Replace null dates with an empty string String data = stockInfoMap.get(f); if (data == null || data.equals("")) data = "empty"; try { itemData.put(f.name(), data); } catch (JSONException e) { e.printStackTrace(); } } } } // Commit changes to the preferences Editor editor = Tools.getAppPreferences(context).edit(); editor.putString("portfolioJson", json.toString()); editor.apply(); // Set the cache flag as dirty mDirtyPortfolioStockMap = true; } public static HashMap<String, HashMap<PortfolioField, String>> getPortfolioStockMapForWidget(Context context, String[] symbols) { HashMap<String, HashMap<PortfolioField, String>> portfolioStockMapForWidget = new HashMap<String, HashMap<PortfolioField, String>>(); HashMap<String, HashMap<PortfolioField, String>> portfolioStockMap = getPortfolioStockMap(context); // Add stock details for any symbols that exist in the widget for (String symbol : Arrays.asList(symbols)) { HashMap<PortfolioField, String> stockInfoMap = portfolioStockMap.get(symbol); if (stockInfoMap != null && (stockInfoMap.get(PortfolioField.PRICE) != null || stockInfoMap.get(PortfolioField.CUSTOM_DISPLAY) != null)) portfolioStockMapForWidget.put(symbol, stockInfoMap); } return portfolioStockMapForWidget; } public static void cleanupPreferenceFiles(Context context) { // Remove old preferences if we are upgrading ArrayList<String> l = new ArrayList<String>(); // Shared preferences is never deleted l.add(context.getString(R.string.prefs_name) + ".xml"); for (int id : UserData.getAppWidgetIds2(context)) l.add(context.getString(R.string.prefs_name) + id + ".xml"); // Remove files we do not have an active widget for String appDir = context.getFilesDir().getParentFile().getPath(); File f_shared_preferences = new File(appDir + "/shared_prefs"); // Check if shared_preferences exists // TODO: Work out why this is ever null and an alternative strategy if (f_shared_preferences.exists()) for (File f : f_shared_preferences.listFiles()) if (!l.contains(f.getName())) //noinspection ResultOfMethodCallIgnored f.delete(); } public enum PortfolioField { PRICE, DATE, QUANTITY, LIMIT_HIGH, LIMIT_LOW, CUSTOM_DISPLAY, SYMBOL_2 } }