Java tutorial
/* * $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ * $ $ * $ _oo0oo_ $ * $ o8888888o $ * $ 88" . "88 $ * $ (| -_- |) $ * $ 0\ = /0 $ * $ ___/`-_-'\___ $ * $ .' \\| |$ '. $ * $ / \\||| : |||$ \ $ * $ / _||||| -:- |||||- \ $ * $ | | \\\ - $/ | | $ * $ | \_| ''\- -/'' |_/ | $ * $ \ .-\__ '-' ___/-. / $ * $ ___'. .' /-_._-\ `. .'___ $ * $ ."" '< `.___\_<|>_/___.' >' "". $ * $ | | : `- \`.;`\ _ /`;.`/ - ` : | | $ * $ \ \ `_. \_ __\ /__ _/ .-` / / $ * $ =====`-.____`.___ \_____/___.-`___.-'===== $ * $ `=-_-=' $ * $ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ $ * $ $ * $ Buddha Bless Never Bug $ * $ $ * $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ * * Copyright (C) 2017 Jackie's The Android Open Source Project * * 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 com.jackie.sunshine.app.sync; import android.accounts.Account; import android.accounts.AccountManager; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.AbstractThreadedSyncAdapter; import android.content.ContentProviderClient; import android.content.ContentResolver; import android.content.ContentUris; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.SyncRequest; import android.content.SyncResult; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.TaskStackBuilder; import android.text.format.Time; import android.util.Log; import com.jackie.sunshine.app.BuildConfig; import com.jackie.sunshine.app.MainActivity; import com.jackie.sunshine.app.R; import com.jackie.sunshine.app.Utility; import com.jackie.sunshine.app.data.WeatherContract; import com.jackie.sunshine.app.data.WeatherContract.LocationEntry; import com.jackie.sunshine.app.data.WeatherContract.WeatherEntry; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.GregorianCalendar; import java.util.Vector; /** * Created 17/5/12. * * @author Jackie * @version 1.0 */ public class SunshineSyncAdapter extends AbstractThreadedSyncAdapter { private static final String TAG = "SunshineSyncAdapter"; private static final int SYNC_INTERVAL = 60 * 60 * 3; private static final int SYNC_FLEXTIME = SYNC_INTERVAL / 3; private static final long DAY_IN_MILLIS = 1000 * 60 * 60 * 24; private static final int WEATHER_NOTIFICATION_ID = 3004; // these indices must match the projection private static final int INDEX_WEATHER_ID = 0; private static final int INDEX_MAX_TEMP = 1; private static final int INDEX_MIN_TEMP = 2; private static final int INDEX_SHORT_DESC = 3; private static final String[] NOTIFY_WEATHER_PROJECTION = new String[] { WeatherEntry.COLUMN_WEATHER_ID, WeatherEntry.COLUMN_MAX_TEMP, WeatherEntry.COLUMN_MIN_TEMP, WeatherEntry.COLUMN_SHORT_DESC }; public static void initializeSyncAdapter(Context context) { getSyncAccount(context); } /** * Helper method to get the fake account to be used with SyncAdapter, or make a new one * if the fake account doesn't exist yet. If we make a new account, we call the * onAccountCreated method so we can initialize things. * * @param context The context used to access the account service * @return a fake account. */ public static Account getSyncAccount(Context context) { // Get an instance of the Android account manager AccountManager manager = (AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE); // Create the account type and default account Account newAccount = new Account(context.getString(R.string.app_name), context.getString(R.string.sync_account_type)); // If the password doesn't exist, the account doesn't exist if (manager.getPassword(newAccount) == null) { /* * Add the account and account type, no password or user data * If successful, return the Account object, otherwise report an error. */ if (!manager.addAccountExplicitly(newAccount, "", null)) return null; /* * If you don't set android:syncable="true" in * in your <provider> element in the manifest, * then call ContentResolver.setIsSyncable(account, AUTHORITY, 1) * here. */ onAccountCreated(newAccount, context); } return newAccount; } public static void onAccountCreated(Account newAccount, Context context) { /* * Since we've created an account */ configurePeriodicSync(context, SYNC_INTERVAL, SYNC_FLEXTIME); /* * Without calling setSyncAutomatically, our periodic sync will not be enabled. */ ContentResolver.setSyncAutomatically(newAccount, context.getString(R.string.content_authority), true); /** * Finally, let's do a sync to get things started */ syncImmediately(context); } /** * Helper method to schedule the sync adapter periodic execution */ public static void configurePeriodicSync(Context context, long syncInterval, long flexTime) { Account account = getSyncAccount(context); String authority = context.getString(R.string.content_authority); SyncRequest request = new SyncRequest.Builder().syncPeriodic(syncInterval, flexTime) .setSyncAdapter(account, authority).setExtras(new Bundle()).build(); ContentResolver.requestSync(request); } /** * Helper method to have the sync adapter sync immediately * * @param context The context used to access the account service */ public static void syncImmediately(Context context) { Bundle bundle = new Bundle(); bundle.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true); bundle.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true); ContentResolver.requestSync(getSyncAccount(context), context.getString(R.string.content_authority), bundle); } SunshineSyncAdapter(Context context, boolean autoInitialize) { super(context, autoInitialize); } @Override public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) { Log.d(TAG, "onPerformSync: Called."); String locationQuery = Utility.getPreferredLocation(getContext()); // These two need to be declared outside the try/catch // so that they can be closed in the finally block. HttpURLConnection urlConnection = null; BufferedReader reader = null; // Will contain the raw JSON response as a string. String forecastJsonStr = null; String format = "json"; String units = "metric"; int numDays = 14; try { // Construct the URL for the OpenWeatherMap query // Possible parameters are avaiable at OWM's forecast API page, at // http://openweathermap.org/API#forecast final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2" + ".5/forecast/daily?"; final String QUERY_PARAM = "q"; final String FORMAT_PARAM = "mode"; final String UNITS_PARAM = "units"; final String DAYS_PARAM = "cnt"; final String APPID_PARAM = "APPID"; Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon().appendQueryParameter(UNITS_PARAM, units) .appendQueryParameter(FORMAT_PARAM, format).appendQueryParameter(QUERY_PARAM, locationQuery) .appendQueryParameter(DAYS_PARAM, Integer.toString(numDays)) .appendQueryParameter(APPID_PARAM, BuildConfig.OPEN_WEATHER_MAP_API_KEY).build(); URL url = new URL(builtUri.toString()); // Create the request to OpenWeatherMap, and open the connection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("GET"); urlConnection.connect(); // Read the input stream into a String InputStream inputStream = urlConnection.getInputStream(); StringBuffer buffer = new StringBuffer(); if (inputStream == null) { // Nothing to do. return; } reader = new BufferedReader(new InputStreamReader(inputStream)); String line; while ((line = reader.readLine()) != null) { // Since it's JSON, adding a newline isn't necessary (it won't affect parsing) // But it does make debugging a *lot* easier if you print out the completed // buffer for debugging. buffer.append(line + "\n"); } if (buffer.length() == 0) { // Stream was empty. No point in parsing. return; } forecastJsonStr = buffer.toString(); getWeatherDataFromJson(forecastJsonStr, locationQuery); } catch (IOException e) { Log.e(TAG, "Error ", e); // If the code didn't successfully get the weather data, there's no point in attemping // to parse it. } catch (JSONException e) { Log.e(TAG, e.getMessage(), e); e.printStackTrace(); } finally { if (urlConnection != null) { urlConnection.disconnect(); } if (reader != null) { try { reader.close(); } catch (final IOException e) { Log.e(TAG, "Error closing stream", e); } } } } /** * Helper method to handle insertion of a new location in the weather database. * * @param locationSetting The location string used to request updates from the server. * @param cityName A human-readable city name, e.g "Mountain View" * @param lat the latitude of the city * @param lon the longitude of the city * @return the row ID of the added location. */ private long addLocation(String locationSetting, String cityName, double lat, double lon) { ContentResolver locationResolver = getContext().getContentResolver(); Cursor locationCursor = locationResolver.query(LocationEntry.CONTENT_URI, new String[] { LocationEntry._ID }, LocationEntry.COLUMN_LOCATION_SETTING + " = ?", new String[] { locationSetting }, null); long locationId; // Students: First, check if the location with this city name exists in the db if (locationCursor != null && locationCursor.moveToFirst()) { // If it exists, return the current ID locationId = locationCursor.getLong(locationCursor.getColumnIndex(LocationEntry._ID)); } else { // Otherwise, insert it using the content resolver and the base URI ContentValues locationValues = new ContentValues(); locationValues.put(LocationEntry.COLUMN_LOCATION_SETTING, locationSetting); locationValues.put(LocationEntry.COLUMN_CITY_NAME, cityName); locationValues.put(LocationEntry.COLUMN_COORD_LAT, lat); locationValues.put(LocationEntry.COLUMN_COORD_LONG, lon); Uri insertUri = locationResolver.insert(LocationEntry.CONTENT_URI, locationValues); locationId = ContentUris.parseId(insertUri); } if (locationCursor != null && !locationCursor.isClosed()) { locationCursor.close(); } return locationId; } /** * Take the String representing the complete forecast in JSON Format and * pull out the data we need to construct the Strings needed for the wireframes. * <p> * Fortunately parsing is easy: constructor takes the JSON string and converts it * into an Object hierarchy for us. */ private void getWeatherDataFromJson(String forecastJsonStr, String locationSetting) throws JSONException { // Now we have a String representing the complete forecast in JSON Format. // Fortunately parsing is easy: constructor takes the JSON string and converts it // into an Object hierarchy for us. // These are the names of the JSON objects that need to be extracted. // Location information final String OWM_CITY = "city"; final String OWM_CITY_NAME = "name"; final String OWM_COORD = "coord"; // Location coordinate final String OWM_LATITUDE = "lat"; final String OWM_LONGITUDE = "lon"; // Weather information. Each day's forecast info is an element of the "list" array. final String OWM_LIST = "list"; final String OWM_PRESSURE = "pressure"; final String OWM_HUMIDITY = "humidity"; final String OWM_WINDSPEED = "speed"; final String OWM_WIND_DIRECTION = "deg"; // All temperatures are children of the "temp" object. final String OWM_TEMPERATURE = "temp"; final String OWM_MAX = "max"; final String OWM_MIN = "min"; final String OWM_WEATHER = "weather"; final String OWM_DESCRIPTION = "main"; final String OWM_WEATHER_ID = "id"; try { JSONObject forecastJson = new JSONObject(forecastJsonStr); JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST); JSONObject cityJson = forecastJson.getJSONObject(OWM_CITY); String cityName = cityJson.getString(OWM_CITY_NAME); JSONObject cityCoord = cityJson.getJSONObject(OWM_COORD); double cityLatitude = cityCoord.getDouble(OWM_LATITUDE); double cityLongitude = cityCoord.getDouble(OWM_LONGITUDE); long locationId = addLocation(locationSetting, cityName, cityLatitude, cityLongitude); // Insert the new weather information into the database Vector<ContentValues> cVVector = new Vector<>(weatherArray.length()); // OWM returns daily forecasts based upon the local time of the city that is being // asked for, which means that we need to know the GMT offset to translate this data // properly. // Since this data is also sent in-order and the first day is always the // current day, we're going to take advantage of that to get a nice // normalized UTC date for all of our weather. GregorianCalendar calendar = new GregorianCalendar(); Time dayTime = new Time(); dayTime.setToNow(); // we start at the day returned by local time. Otherwise this is a mess. int julianStartDay = Time.getJulianDay(System.currentTimeMillis(), dayTime.gmtoff); // now we work exclusively in UTC dayTime = new Time(); for (int i = 0; i < weatherArray.length(); i++) { // These are the values that will be collected. long dateTime; double pressure; int humidity; double windSpeed; double windDirection; double high; double low; String description; int weatherId; // Get the JSON object representing the day JSONObject dayForecast = weatherArray.getJSONObject(i); // Cheating to convert this to UTC time, which is what we want anyhow dateTime = dayTime.setJulianDay(julianStartDay + i); pressure = dayForecast.getDouble(OWM_PRESSURE); humidity = dayForecast.getInt(OWM_HUMIDITY); windSpeed = dayForecast.getDouble(OWM_WINDSPEED); windDirection = dayForecast.getDouble(OWM_WIND_DIRECTION); // Description is in a child array called "weather", which is 1 element long. // That element also contains a weather code. JSONObject weatherObject = dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0); description = weatherObject.getString(OWM_DESCRIPTION); weatherId = weatherObject.getInt(OWM_WEATHER_ID); // Temperatures are in a child object called "temp". Try not to name variables // "temp" when working with temperature. It confuses everybody. JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE); high = temperatureObject.getDouble(OWM_MAX); low = temperatureObject.getDouble(OWM_MIN); ContentValues weatherValues = new ContentValues(); weatherValues.put(WeatherEntry.COLUMN_LOC_KEY, locationId); weatherValues.put(WeatherEntry.COLUMN_DATE, dateTime); weatherValues.put(WeatherEntry.COLUMN_HUMIDITY, humidity); weatherValues.put(WeatherEntry.COLUMN_PRESSURE, pressure); weatherValues.put(WeatherEntry.COLUMN_WIND_SPEED, windSpeed); weatherValues.put(WeatherEntry.COLUMN_DEGREES, windDirection); weatherValues.put(WeatherEntry.COLUMN_MAX_TEMP, high); weatherValues.put(WeatherEntry.COLUMN_MIN_TEMP, low); weatherValues.put(WeatherEntry.COLUMN_SHORT_DESC, description); weatherValues.put(WeatherEntry.COLUMN_WEATHER_ID, weatherId); cVVector.add(weatherValues); } int inserted = 0; // add to database if (cVVector.size() > 0) { // Student: call bulkInsert to add the weatherEntries to the database here ContentValues[] cvArray = new ContentValues[cVVector.size()]; cVVector.toArray(cvArray); ContentResolver contentResolver = getContext().getContentResolver(); inserted = contentResolver.bulkInsert(WeatherEntry.CONTENT_URI, cvArray); contentResolver.delete(WeatherEntry.CONTENT_URI, WeatherEntry.COLUMN_DATE + "<= " + "?", new String[] { Long.toString(dayTime.setJulianDay(julianStartDay - 1)) }); notifyWeather(); } Log.d(TAG, "getWeatherDataFromJson: " + inserted + " inserted"); } catch (JSONException e) { Log.e(TAG, e.getMessage(), e); e.printStackTrace(); } } private void notifyWeather() { Context context = getContext(); //checking the last update and notify if it' the first of the day SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); String displayNotificationsKey = context.getString(R.string.pref_enable_notifications_key); boolean needNotification = prefs.getBoolean(displayNotificationsKey, Boolean.valueOf(context.getString(R.string.pref_enable_notifications_default))); if (needNotification) { String lastNotificationKey = context.getString(R.string.pref_last_notification); long lastSync = prefs.getLong(lastNotificationKey, 0); if (System.currentTimeMillis() - lastSync >= DAY_IN_MILLIS) { // Last sync was more than 1 day ago, let's send a notification with the weather. String locationQuery = Utility.getPreferredLocation(context); Uri weatherUri = WeatherContract.WeatherEntry.buildWeatherLocationWithDate(locationQuery, System.currentTimeMillis()); // we'll query our contentProvider, as always Cursor cursor = context.getContentResolver().query(weatherUri, NOTIFY_WEATHER_PROJECTION, null, null, null); if (cursor.moveToFirst()) { int weatherId = cursor.getInt(INDEX_WEATHER_ID); double high = cursor.getDouble(INDEX_MAX_TEMP); double low = cursor.getDouble(INDEX_MIN_TEMP); String desc = cursor.getString(INDEX_SHORT_DESC); int iconId = Utility.getIconResourceForWeatherCondition(weatherId); String title = context.getString(R.string.app_name); // Define the text of the forecast. String contentText = String.format(context.getString(R.string.format_notification), desc, Utility.formatTemperature(context, high), Utility.formatTemperature(context, low)); //build your notification here. Intent intent = new Intent(context, MainActivity.class); TaskStackBuilder stackBuilder = TaskStackBuilder.create(context); stackBuilder.addParentStack(MainActivity.class); stackBuilder.addNextIntent(intent); PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); Notification notification = new Notification.Builder(context).setSmallIcon(iconId) .setContentTitle(title).setContentText(contentText).setContentIntent(pendingIntent) .build(); NotificationManager notificationManager = (NotificationManager) context .getSystemService(Context.NOTIFICATION_SERVICE); notificationManager.notify(WEATHER_NOTIFICATION_ID, notification); //refreshing last sync SharedPreferences.Editor editor = prefs.edit(); editor.putLong(lastNotificationKey, System.currentTimeMillis()); editor.apply(); } cursor.close(); } } } }