Java tutorial
/* * Copyright (c) 2010-2011 Gsta Jonasson. All Rights Reserved. * See the NOTICE file distributed with this work for additional * information regarding copyright ownership. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package st.brothas.mtgoxwidget; import android.app.PendingIntent; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProvider; import android.content.Context; import android.content.Intent; import android.graphics.Color; import android.util.Log; import android.widget.RemoteViews; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpGet; import org.json.JSONException; import org.json.JSONObject; import st.brothas.mtgoxwidget.net.HttpManager; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.math.BigDecimal; import java.text.SimpleDateFormat; import java.util.Date; /** * */ public class MtGoxWidgetProvider extends AppWidgetProvider { public static final String LOG_TAG = "MtGox"; private static final SimpleDateFormat dateFormat = new SimpleDateFormat("E HH:mm"); private static final int DATA_IS_CONSIDERED_OLD_AFTER_MINUTES = 30; private enum WidgetColor { Warning, StartValue, Increase, Decrease, Normal } @Override public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { final int N = appWidgetIds.length; for (int i = 0; i < N; i++) { int appWidgetId = appWidgetIds[i]; updateAppWidget(context, appWidgetManager, appWidgetId); } } static void updateAppWidget(final Context context, AppWidgetManager appWidgetManager, int appWidgetId) { WidgetPreferences preferences = MtGoxPreferencesActivity.getWidgetPreferences(context, appWidgetId); if (preferences == null) { // Don't do anything unless the rate service has been chosen. // Show a "please remove this widget and add a new one" appWidgetManager.updateAppWidget(appWidgetId, new RemoteViews(context.getPackageName(), R.layout.appwidget_replace_me)); return; } RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider); Intent clickIntent = new Intent(context, GraphPopupActivity.class); clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); clickIntent.setAction("dummyAction"); // Needed to get the extra variables included in the call // Note: the appWidgetId needs to be sent in the pendingIntent as request code, otherwise only ONE // cached intent will be used for all widget instances! PendingIntent pendingIntent = PendingIntent.getActivity(context, appWidgetId, clickIntent, 0); views.setOnClickPendingIntent(R.id.appwidget_box, pendingIntent); views.setTextViewText(R.id.appwidget_service_name, preferences.getRateService().getName()); MtGoxDataOpenHelper dbHelper = new MtGoxDataOpenHelper(context); MtGoxTickerData prevData = dbHelper.getLastTickerData(preferences); MtGoxTickerData newData; JSONObject latestQuoteJSON = getLatestQuoteJSON(preferences); if (latestQuoteJSON != null) { newData = preferences.getRateService().parseJSON(latestQuoteJSON); newData.setCurrencyConversion(preferences.getCurrencyConversion()); storeLastValueIfNotNull(dbHelper, newData); updateViews(views, prevData, newData, preferences); } else if (prevData != null) { newData = prevData; updateViews(views, prevData, newData, preferences); } else { updateViewsWithError(views, preferences); } appWidgetManager.updateAppWidget(appWidgetId, views); } private static void updateViews(RemoteViews views, MtGoxTickerData prevData, MtGoxTickerData newData, WidgetPreferences preferences) { String updated = "@ " + dateFormat.format(newData.getTimestamp()); String lastRounded = round(newData.getLast()); String lowRounded = round(newData.getLow()); String highRounded = round(newData.getHigh()); views.setTextViewText(R.id.appwidget_last, preferences.getCurrencyConversion().symbol + lastRounded); views.setTextColor(R.id.appwidget_updated, getColor(preferences.getColorMode(), WidgetColor.Normal)); if (newData.getTimestamp().before(getDateMinutesAgo(DATA_IS_CONSIDERED_OLD_AFTER_MINUTES))) { // Data is old, show it by "old" and "warning" colors views.setTextColor(R.id.appwidget_last, Color.GRAY); views.setTextColor(R.id.appwidget_updated, getColor(preferences.getColorMode(), WidgetColor.Warning)); } else if (prevData != null) { // We have previous data, compare to get the color views.setTextColor(R.id.appwidget_last, getColorFromValueChange(prevData.getLast(), newData.getLast(), preferences.getColorMode())); } else { // No previous data, set standard color views.setTextColor(R.id.appwidget_last, getColor(preferences.getColorMode(), WidgetColor.StartValue)); } views.setTextViewText(R.id.appwidget_high, highRounded); views.setTextViewText(R.id.appwidget_low, lowRounded); views.setTextViewText(R.id.appwidget_updated, updated); //aws if (preferences.getCurrencyConversion().toString().contains("LTC_")) { views.setImageViewResource(R.id.appwidget_logo, R.drawable.lc_logo_32); } //else default which is bitcoin logo } private static void updateViewsWithError(RemoteViews views, WidgetPreferences preferences) { views.setTextViewText(R.id.appwidget_last, "N/A"); views.setTextColor(R.id.appwidget_last, getColor(preferences.getColorMode(), WidgetColor.Warning)); views.setTextViewText(R.id.appwidget_updated, "@ " + dateFormat.format(new Date())); views.setTextColor(R.id.appwidget_updated, getColor(preferences.getColorMode(), WidgetColor.Normal)); } private static int getColor(ColorMode colorMode, WidgetColor widgetColor) { if (colorMode.equals(ColorMode.Default)) { switch (widgetColor) { case Warning: return Color.parseColor("#ff3030"); case StartValue: return Color.YELLOW; case Normal: return Color.LTGRAY; case Increase: return Color.GREEN; case Decrease: return Color.parseColor("#ff3030"); default: throw new IllegalArgumentException("No color defined for " + widgetColor); } } else if (colorMode.equals(ColorMode.Grayscale)) { switch (widgetColor) { case Warning: return Color.WHITE; case StartValue: return Color.LTGRAY; case Normal: return Color.LTGRAY; case Increase: return Color.WHITE; case Decrease: return Color.GRAY; default: throw new IllegalArgumentException("No color defined for " + widgetColor); } } else { throw new IllegalArgumentException("No color mode defined for " + colorMode); } } private static Date getDateMinutesAgo(int minutes) { return new Date(System.currentTimeMillis() - (minutes * 60 * 1000)); } private static String round(Double value) { if (value == null) { return "N/A"; } int decimals = 2; if (value >= 1000) { decimals = 0; } else if (value >= 100) { decimals = 1; } return BigDecimal.valueOf(value).setScale(decimals, BigDecimal.ROUND_HALF_UP).toString(); } private static int getColorFromValueChange(Double prevValue, Double nowValue, ColorMode colorMode) { if (prevValue == null || nowValue == null || prevValue.equals(nowValue)) { return getColor(colorMode, WidgetColor.StartValue); } else if (prevValue < nowValue) { return getColor(colorMode, WidgetColor.Increase); } else { return getColor(colorMode, WidgetColor.Decrease); } } private static void storeLastValueIfNotNull(MtGoxDataOpenHelper dbHelper, MtGoxTickerData data) { if (data != null) { dbHelper.storeTickerData(data); dbHelper.cleanUp(); } } private static JSONObject getLatestQuoteJSON(WidgetPreferences preferences) { HttpGet httpget = new HttpGet( preferences.getRateService().getTickerUrl(preferences.getCurrencyConversion())); HttpResponse response; try { response = HttpManager.execute(httpget); HttpEntity entity = response.getEntity(); JSONObject jObject = null; if (entity != null) { InputStream instream = entity.getContent(); String result = convertStreamToString(instream); // Log.d(LOG_TAG, "Getting URI: " + httpget.getURI()); // Log.d(LOG_TAG, "Response: " + result); jObject = new JSONObject(result); instream.close(); } return jObject; } catch (ClientProtocolException e) { Log.e(LOG_TAG, "Error when getting JSON", e); } catch (IOException e) { Log.e(LOG_TAG, "Error when getting JSON: " + e.getMessage()); } catch (JSONException e) { Log.e(LOG_TAG, "Error when parsing JSON", e); } return null; } private static String convertStreamToString(InputStream instream) { BufferedReader rd = new BufferedReader(new InputStreamReader(instream), 4096); String line; StringBuilder sb = new StringBuilder(); try { while ((line = rd.readLine()) != null) { sb.append(line); } rd.close(); } catch (IOException e) { Log.e(LOG_TAG, "Error when converting inputstream to string", e); } return sb.toString(); } @Override public void onDeleted(Context context, int[] appWidgetIds) { // When the user deletes the widget, delete the preference associated with it. final int N = appWidgetIds.length; for (int i = 0; i < N; i++) { MtGoxPreferencesActivity.deletePrefs(context, appWidgetIds[i]); } } public static void updateAppWidgetWithWaitMessage(Context context, AppWidgetManager appWidgetManager, int appWidgetId) { appWidgetManager.updateAppWidget(appWidgetId, new RemoteViews(context.getPackageName(), R.layout.appwidget_loading)); } }