Use Java background task for fetching notifications, close #18
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package com.transistorsoft.cordova.backgroundfetch;
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import android.app.Activity;
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import android.app.Notification;
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import android.app.NotificationChannel;
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import android.app.NotificationManager;
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import android.app.PendingIntent;
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import android.content.Context;
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import android.content.Intent;
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import android.content.SharedPreferences;
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import com.netsyms.BusinessMobile.R;
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import com.transistorsoft.tsbackgroundfetch.BackgroundFetch;
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import android.graphics.Color;
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import android.os.Build;
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import android.provider.Settings;
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import android.support.v4.app.NotificationCompat;
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import android.util.Log;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.io.UnsupportedEncodingException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import org.json.JSONException;
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import org.json.JSONObject;
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import org.json.JSONArray;
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public class BackgroundFetchHeadlessTask implements HeadlessTask {
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private static final String PREFS_NAME = "NativeStorage";
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private static final String KEY = "accounts";
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private static String shownNotifications = "";
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public final String NOTIFICATION_CHANNEL_ID = "background-channel-id";
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public static String getValue(Context context, String key, String defaultValue) {
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SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, Activity.MODE_PRIVATE);
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return settings.getString(key, defaultValue);
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}
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/**
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* https://stackoverflow.com/a/34691486
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*
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* @param urlString
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* @return
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* @throws IOException
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*/
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public static String getStringFromURL(String urlString) throws IOException {
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HttpURLConnection urlConnection = null;
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URL url = new URL(urlString);
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urlConnection = (HttpURLConnection) url.openConnection();
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urlConnection.setRequestMethod("GET");
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urlConnection.setReadTimeout(10000 /* milliseconds */);
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urlConnection.setConnectTimeout(15000 /* milliseconds */);
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urlConnection.setDoOutput(true);
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urlConnection.connect();
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BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
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StringBuilder sb = new StringBuilder();
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String line;
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while ((line = br.readLine()) != null) {
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sb.append(line + "\n");
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}
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br.close();
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String jsonString = sb.toString();
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return jsonString;
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}
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@Override
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public void onFetch(Context context) {
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Log.d(BackgroundFetch.TAG, "Notification Poller: onFetch");
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Thread thread = new Thread(new Runnable() {
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@Override
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public void run() {
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String accountjson = getValue(context, KEY, null).replaceAll("\\\\", "");
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accountjson = accountjson.substring(1, accountjson.length() - 1);
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//Log.d(BackgroundFetch.TAG, "Notification Poller: Account JSON: " + accountjson);
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try {
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JSONArray accounts = new JSONArray(accountjson);
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for (int i = 0; i < accounts.length(); i++) {
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try {
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JSONObject acct = accounts.getJSONObject(i);
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Log.d(BackgroundFetch.TAG, "Notification Poller: Account " + i + " URL: " + acct.getString("syncurl"));
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String notificationString = getStringFromURL(acct.getString("syncurl") + "?key=" + acct.getString("key") + "&username=" + acct.getString("username") + "&action=checknotifications");
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//Log.d(BackgroundFetch.TAG, "Notification Poller: Account " + i + " JSON: " + notificationString);
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JSONArray notifications = new JSONObject(notificationString).getJSONArray("notifications");
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Log.d(BackgroundFetch.TAG, "Notification Poller: Account " + i + " JSON parsed: " + notifications.length() + " notifications");
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for (int j = 0; j < notifications.length(); j++) {
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JSONObject notif = notifications.getJSONObject(j);
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Log.d(BackgroundFetch.TAG, "Notification Poller: Procesing notification ID " + notif.getString("id") + " with title " + notif.getString("title"));
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if (notif.getBoolean("seen") || shownNotifications.contains("|" + i + ":" + notif.getString("id") + "|")) {
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continue;
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}
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Intent intent = new Intent(context, com.netsyms.BusinessMobile.MainActivity.class);
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PendingIntent contentIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
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NotificationCompat.Builder b = new NotificationCompat.Builder(context);
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b.setAutoCancel(true)
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.setDefaults(Notification.DEFAULT_ALL)
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.setSmallIcon(R.drawable.ic_notification)
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.setContentTitle(notif.getString("title"))
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.setContentText(notif.getString("content"))
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.setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
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.setContentIntent(contentIntent)
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.setPriority(NotificationCompat.PRIORITY_DEFAULT)
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.setVisibility(Notification.VISIBILITY_PRIVATE);
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// Create alternate notification for lockscreen
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NotificationCompat.Builder lockb = new NotificationCompat.Builder(context);
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if (notif.getBoolean("sensitive") == true) {
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lockb
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.setSmallIcon(R.drawable.ic_notification)
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.setContentTitle("Contents hidden")
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.setPriority(NotificationCompat.PRIORITY_DEFAULT);
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} else {
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lockb
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.setSmallIcon(R.drawable.ic_notification)
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.setContentTitle(notif.getString("title"))
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.setContentText(notif.getString("content"))
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.setPriority(NotificationCompat.PRIORITY_DEFAULT);
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}
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b.setPublicVersion(lockb.build());
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NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
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CharSequence name = "Background Notifications";
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int importance = NotificationManager.IMPORTANCE_DEFAULT;
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NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, name, importance);
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channel.enableLights(true);
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channel.enableVibration(true);
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channel.setLightColor(Color.rgb(33, 150, 243));
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// Register the channel with the system; you can't change the importance
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// or other notification behaviors after this
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b.setChannelId(NOTIFICATION_CHANNEL_ID);
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notificationManager.createNotificationChannel(channel);
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}
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notificationManager.notify(Integer.parseInt(notif.getString("id")), b.build());
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Log.d(BackgroundFetch.TAG, "Notification Poller: Shown notification " + notif.getString("id"));
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shownNotifications += "|" + i + ":" + notif.getString("id") + "|";
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}
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} catch (Exception e) {
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Log.d(BackgroundFetch.TAG, "Notification Poller: Exception: " + e.getMessage());
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Log.d(BackgroundFetch.TAG, "Notification Poller: Stack trace: " + Log.getStackTraceString(e));
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}
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}
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} catch (Exception e) {
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Log.d(BackgroundFetch.TAG, "Notification Poller: Exception: " + e.getMessage());
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Log.d(BackgroundFetch.TAG, "Notification Poller: Stack trace: " + Log.getStackTraceString(e));
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} finally {
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BackgroundFetch.getInstance(context).finish();
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}
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}
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}
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);
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thread.start();
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}
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}
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